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QUALITY OPERATIONS STANDARD
TITLE:
SELLER REQUIREMENTS FOR TEMPER INSPECTION BY
ELECTRICAL MEASUREMENT AND/OR HARDNESS
MEASUREMENT
Standard Number:
PREPARED BY:
QOS - 0021
Revision Letter:
APPROVED BY:
*Kevin Cook
Mgr. Special Programs, Technical Services
APPROVED BY:
E
Effective Date:
07/31/12
* John Munyak
Manager, Technical Services
* R. Pucci
Technical Specialist, E-2C Program Quality
REVISIONS
DESCRIPTION
* Approvals on file
DATE
REV.
REV. BY
2/01/05
B
W.D./R.P.
Update format, clarify requirements
Clarify Hardness and Conductivity requirements
10/17/05
C
W.D./R.P.
03/21/08
D
W.D./R.P.
Restrict heat treat operations on final temper
parts, table V & VII revisions.
Allow conductivity only testing for Al. alloys in
original mill supplied temper
7/31/12
E
R.P.
Address heat treatment of as received material. Add
thin material readings.
Occasionally mill produced material does not meet
QOS 0021 requirements, tensile testing produces
satisfactory requirements.
Clarified the number of measurements required on
parts. Additional material add in table V.
Revised document for Electrical Conductivity
readings on parts. Added values for additional
alloy and temper.
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RATIONALE
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I.
CONTENTS:
Section
Page
II.
Scope
3
III.
Purpose
3
IV. Associated Documents
4
V.
4
Certification of Personnel
VI. Quality Control
4
VII. Requirements
4
VIII. Definitions
5
IX. Hardness Testing Procedure
6
X.
7,8,9
Electrical Conductivity Procedure
XI. Tables :
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Summary - Examples
Table I - Hardness-Thickness Chart – Aluminum Alloys
Table II - Hardness Corrections – Surface Curvature
Table III - Hardness Corrections – Surface Curvature
Table IV - Rockwell Hardness & Electrical Conductivity Al. Plate
Table V - Hardness Requirements for Wrought Aluminum
Alloys Excluding Plate
Table VI – Hardness Requirements for Aluminum Alloy Castings
Table VII – Electrical Conductivity Requirements Wrought Aluminum
Alloys .063 Inch Thick and Above Excluding Plate
Table VIII – Electrical Conductivity Correction Factors for
Bare Thin Gauge Aluminum
Table IX – Electrical Conductivity Correction Factors for
2024,7075, 7079, 7178 Clad Aluminum
Table X – Electrical Conductivity Correction Factors for
2014 and 2219 Clad Aluminum Alloys
Table XI – Electrical Conductivity Correction Factors for
3003 and 6061 Clad Aluminum Alloys
Table XII – Electrical Conductivity Correction Factors for
Curved Surfaces
Table XIII – Hardness Thickness Chart – Steels
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11,12
13
14
15
16
17,18,19
20
21
22,23
24
25
26,27
28,29,30
31
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I.
CONTENTS: (continued)
Section XI. Tables: (continued)
•
•
•
•
•
•
•
•
II.
Table XIV – Hardness Correction Factors – Surface Curvature -Steel
Table XV – Hardness Correction Factors – Surface Curvature-Steel
Table XVI – Hardness Requirements for Wrought 300
Series Stainless Steels
Table XVII – Rockwell Hardness to Strength Relationship for
Low Alloy Steels
Table XVIII – Rockwell Conversion Values Between Scales - Steel
Table XIX – Frequeny of Hardness Testing – Steel
Table XX – Rockwell Hardness Requirements for
Magnesium Alloy Castings
Table XXI – Rockwell Hardness Requirements for Copper Alloys
32
33
34
35
36
37
38
39,40
SCOPE:
Sellers shall use this specification to verify the temper requirements of the applicable
Northrop Grumman purchase order, material specification and/or engineering drawing.
III.
PURPOSE:
This document describes the requirements for final temper inspection and part acceptance of
aluminum alloys, steel alloys, cast magnesium alloys, and copper alloys by electrical
conductivity measurements and/or hardness testing.
The electrical conductivity and hardness values listed in this document shall be utilized to
verify temper for final part acceptance. Values measured not meeting these requirements
shall be submitted via an RCI for evaluation.
These tables apply to all parts in their final temper as specified within. The origin of the final
heat treatment is not a factor affecting the use of these tables.
Unless otherwise stated on the Engineering drawing or material specification, the electrical
conductivity and hardness requirements listed in this document shall apply. Measurements
that do not meet the electrical conductivity and hardness values specified on the Engineering
Drawing shall be submitted via a SMRR (Seller Material Review Report) per QOS-0035.
For aluminum alloys in the original mill supplied temper, where no re-heat treatment was
performed, the following applies:
Inspection of this product shall consist of conductivity only. Hardness inspection is not
required. When no conductivity value is provided in the applicable material specification the
values in QOS-0021 shall be used.
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III.
PURPOSE: (continued)
NOTE:
Material requirements on some NGC drawings reference materials that are received in a final
temper condition. These are materials whose final temper condition is only produced from a
mill. An example is Aluminum alloy 7050-T76511 extrusion. If the drawings pertaining to
these materials does not contain a process code for heat treatment or hot forming (hot
forming allows re-heat treatment under certain conditions) these parts may not be heat
treated, annealed, or aged in the process of part manufacture. The intent of these drawings is
to manufacture the part from the material in its as supplied final temper.
IV.
ASSOCIATED DOCUMENTS:
The current issue of the following documents shall be considered a part of this specification
to the extent indicated herein.
ANSI/ASTM E18 Standard Test Methods for Rockwell Superficial Hardness
of Metallic Materials
MIL-STD-1537
Electrical Conductivity Test for Measurement of Heat
Treatment of Aluminum Alloys, Eddy Current Method
QOS-0035
Guidelines for Supplier Preparation & Processing of Seller
Material Review Report (SMRR)
V. CERTIFICATION OF PERSONNEL:
Personnel shall posses the necessary skills, background and training required to satisfactorily
perform the testing as specified herein.
VI. QUALITY CONTROL:
Sellers Quality personnel shall assure that the requirements of this specification are met by
monitoring the process and examine the end items in accordance with the established and
approved quality assurance provisions.
Questions/concerns relative to this document shall be submitted on the Request for
Change/Information form (P0-F030) located on Oasis, Contract Data-Forms.
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VII. REQUIREMENTS:
Materials covered by this specification shall meet the hardness and/or electrical conductivity
requirements as listed in the applicable tables herein, unless otherwise specified on
engineering drawings or referenced specifications.
VIII. DEFINITIONS:
The following definitions shall apply to terms that have uncommon or special meaning as
used in this specification.
Aluminum Alloy Plate - A rolled product rectangular in cross section with thickness of
0.250 inch or more in nominal thickness.
Direct Reading Conductivity Instrument – An analog or digital electronic instrument and
probe that displays the conductivity of a nonferrous metal under test in percent IACS.
Edge Effect – The disturbance of the magnetic field and eddy currents due to the proximity
of an abrupt change in specimen geometry (edge).
Lift Off – The effect observed in the electromagnetic test system output due to a change in
magnetic coupling between a test specimen and a probe coil whenever the distance between
them is varied.
International Annealed Copper Standard (IACS) – An internationally recognized
standard of electrical conductivity where copper equals a designation value of 100.
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IX. HARDNESS TESTING PROCEDURE:
The procedure specified in American Society for Testing and Materials test method
procedure ANSI/ASTM E-18 and applicable equipment operation manuals shall be used for
all hardness testing.
•
With the exception of cladding on aluminum materials (refer to applicable table),
hardness shall be performed on bare material surfaces whenever possible. Surface
conditions, such as, but not limited to, coatings, surface treatments and/or finishes
may interfere with temper inspection. Refer to the applicable inspection specification
and/or engineering organization for specific inspection requirements through surface
conditions. Removal and subsequent restoration of pre-inspection surface finish,
when required, shall be coordinated with the applicable Northrop Grumman
engineering section.
•
Surface preparation shall be described in ANSI/ASTM E-18.
•
Only calibrated/certified hardness test instruments may be used.
Note 1: Rockwell Standard Hardness Abbreviations:
All hardness designations have been abbreviated due to space limitations on
the chart(s), i.e.; B, 15T scale etc. refers to HRB, HR15T. This is the
standard industry practice to express Rockwell hardness.
Note 2: Specification ASTM E18 requires for Rockwell B scale the use of a carbide
ball penetrator. Carbide balls have superseded the former use of steel balls.
Rockwell B scale readings using the carbide ball penetrator shall be
designated as HRBW.
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X. ELECTRICAL CONDUCTIVITY PROCEDURE:
The procedures specified in MIL-STD-1537 shall be used with the following additional
requirements:
•
Only a direct reading electrical conductivity test instrument operating at a frequency
of 60 KHz (+/-5 KHz) shall be used. For the purposes of standardization and
simplification, conductivity tables for special conditions such as: thin gauge, clad
aluminum, surface curvature, edge effect, and surface coatings, have been developed
using the Hocking Autosigma 2000, test instrument and (0.71 inch diameter) straight
probe system. When correction factors are needed to cover other conductivity test
instruments or conditions, contact the Technical Services Laboratory for further
instructions.
•
Only calibrated/certified test instruments and standards may be used. Certification
will be performed at least annually using a documented procedure.
•
Lift-off shall not exceed .020 inch in order to maintain system accuracy.
•
The lift-off check (paragraph 4.3.1.2) of MIL-STD-1537 shall be performed daily for
all instruments used. If you do not know your instrument lift-off limitation,
conductivity readings or part/material with nonconductive coatings greater than 0.003
inch in thickness shall not be used to accept/reject unless the following procedure is
used:
a. Obtain average thickness of nonconductive coating on inspection
part/material. Use an Isoscope or equivalent to determine coating thickness.
b. Place probe on conductivity reference standard closest to expected inspection
part/material conductivity and note percent IACS.
c. Place a nonconductive shim, equivalent to inspection part coating thickness,
on the standard. Place probe on shim and note percent IACS value. Proceed
with inspection if;
1. The difference between readings is not more than 0.5 percent IACS.
2. The difference between readings is greater than 0.5 percent IACS and
the nonconductive coating has been removed from the inspection
surface. (Use bare material values when excessive nonconductive
coatings are removed.)
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X. ELECTRICAL CONDUCTIVITY PROCEDURE: (continued)
3. The difference between readings is greater than 0.5 percent IACS and
lift-off correction factors are available for your conductivity test
instrument.
•
Conductivity testing shall be performed at sufficient locations to ensure that the entire
part meets the requirements.
a. At a minimum, three (3) readings are required. One on each end and one in the
middle of the part.
b. The minimum and maximum values of all readings taken shall be recorded.
c. For each individual part, all values must be in the required range and the
maximum allowable variation across all measurements is 3% IACS. For
example, The acceptable range for bare 0.063” 7075-T6 aluminum is 29.5 –
34.5. If the minimum reading is 30.5%, the maximum acceptable reading is
33.5%.
•
Each instrument shall be equipped with a minimum of three standards. One of these
standards shall be in the 25 to 32 percent IACS range, one in the 37 to 43 percent
IACS range and one in the 49 to 61 percent IACS range. These standards shall be
used for all standardization procedures.
•
Verification of acceptable temperature compatibility (+/- 2° F) between the test
instrument probe, conductivity standards, inspection area and parts/materials shall be
performed prior to testing initiation. Parts/materials and test systems that have
remained in the same inspection area/condition for a minimum of 1 hour are
considered acceptable. A touch temperature probe may be used to verify temperature
acceptability at anytime. If temperatures are not +/- 2° F, allow the parts/material and
test system to remain in the inspection area until they meet temperature requirements.
•
The material/parts tested shall have a surface finish of Ra 150 or finer and shall be
free from visible oil, grease, dirt or contaminants.
•
The specimen area to which the eddy current instrument probe is applied shall be at
least as large as the eddy current field generated by the probe. This can be determined
by placing the probe on a flat test specimen and moving it towards an edge while
observing the reading. The distance from the center of the probe to the edge at the
point when the readings begin to change is the radius of the probe field. Twice the
value of this radius therefore represents the minimum diameter of a circular area
required for valid conductivity measurements.
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•
Materials covered in this specification shall meet the respective electrical conductivity
and/or hardness values as listed in the appropriate tables, as applicable, unless
otherwise specified on engineering drawings or referenced specifications. Special
considerations for thickness effects, surface curvature and cladding of aluminum
alloys have been addressed in accordance with the requirements of the respective
tables.
X. ELECTRICAL CONDUCTIVITY PROCEDURE: (continued)
•
Other conductivity test instruments equivalent to the Hocking Autosigma 2000 may
be used. Operating frequency shall be 60KHz +/- 5KHz.
XI. TABLES:
1. Aluminum Alloys
•
•
•
•
•
•
•
•
•
Table I establishes the hardness scales that shall be used with aluminum alloys
of the specified thicknesses.
Tables II and III establish the hardness corrections to be added to compensate
for surface curvature.
Table IV establishes the Rockwell Hardness and Electrical Conductivity
requirements for aluminum alloy plate.
Table V establishes Rockwell Hardness requirements for wrought aluminum
alloys exclusive of plate.
Table VI establishes the Rockwell Hardness requirements for cast aluminum
alloys.
Table VII establishes the Electrical Conductivity requirements for aluminum
.063 inch in cross sectional thickness and above, exclusive of plate.
Table VIII establishes the Electrical Conductivity Correction Factors for Bare
Thin Gauge Aluminum. (Hocking Autosigma 2000)
Table IX, X, and XI establish the Electrical Conductivity Factors for Clad
Aluminum of various alloys.
Table XII establishes the Electrical Conductivity Correction Factors for curved
surfaces.
Notes:
1. Electrical conductivity and/or hardness testing methods may not be
used for part acceptance if the required heat treat procedure or cycle
has been violated.
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2. Combination of Correction Factors for multiple conditions is
prohibited unless authorized by the Technical Services Laboratory.
XI. TABLES: (continued)
3. Aluminum alloys shall be 100% electrical conductivity tested. From
each lot, perform hardness testing on the two parts having the
maximum and minimum electrical conductivity values. Parts not
conducive to electrical conductivity testing due to factors such as
geometry and/or thickness limitations shall be 100% hardness tested in
lieu of electrical conductivity testing.
2. Steels
•
•
•
•
•
•
•
Table XIII establishes the hardness scales that shall be used with steals of the
specified thicknesses.
Tables XIV and XV establish the corrections to be added to compensate for
the effect of surface curvature.
Table XVI establishes the Rockwell hardness requirements for wrought 300
series stainless steel.
Hardness requirements for low alloy steels, precipitation hardening steels and
400 series stainless steels are listed in the applicable specifications and
engineering drawings.
Table XVII establishes the approximate Rockwell hardness to strength
relationship for low alloy steels.
Table XVIII establishes the approximate Rockwell conversion values between
scales.
Table XIX establishes the Frequency of Hardness testing.
3. Magnesium Alloy
•
Table XX establishes the Rockwell Hardness requirements for magnesium
alloy castings.
4. Copper Alloys
•
Table XXI establishes the Rockwell Hardness requirements for copper alloys.
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XI. TABLES: (continued)
5. How to use Conductivity Correction Tables.
A. Example 1: Find the conductivity values for 2024-T6 aluminum 0.032 thick.
1. Reference Table VII (Electrical Conductivity Requirements for Wrought
Aluminum Alloys (Bare) .063 Inches and Greater in Thickness). In the Alloy
& Temper column locate 2024-T6. In the Range (% IACS) column, the
uncorrected result is 35.0 – 39.0.
2. Reference Table VIII (Electrical Conductivity for Bare Thin Gauge
Aluminum). Select the smaller number from the uncorrected result in step 1,
35.0 (%IACS).
3. Under the Uncorrected Conductivity Values in % IACS column locate 35.0.
Follow this row to the right until you are under the 0.032 inch thickness
column.
4. The corrected conductivity value is 38.0.
5. Select the larger uncorrected result from step # 1 (39.0). Reference Table
VIII, look under the Uncorrected Conductivity Values in % IACS and locate
39.0.
6. Follow this row to the right until you are under the 0.032 inch thickness
column.
7. The corrected conductivity value is 42.0.
8. The Corrected Conductivity for 0.032 inch thick 2024-T6 Aluminum is 38.0 –
42.0 % IACS. These are the values that must be obtained directly from the
conductivity meter for material to be considered acceptable.
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XI. TABLES: (continued)
B. Example 2: Find the conductivity values for 7075-T6 Clad Aluminum 0.040 inch
thick.
1. Reference Table VII (Electrical Conductivity Requirements for Wrought
Aluminum Alloys (Bare) .063 Inches and Greater in Thickness). In the Alloy
& Temper column locate 7075-T6. In the Range (% IACS) column, the
uncorrected result is 29.5 – 34.5.
2. Reference Table IX (Electrical Conductivity for 2024, 7075, 7079, & 7178
Clad Aluminum Alloys). Select the smaller number from the uncorrected
result in step 1, 29.5 (% IACS).
3. Under the Uncorrected Conductivity Values In % IACS column locate 29.5.
Since this column lists values for 29 and 30, you must interpolate to determine
the corrected value for 29.5. Follow rows 29 and 30 to the right until you are
under the 0.040 thickness column. The corrected values of 32.5 and 33.0
should be attained.
4. The corrected conductivity interpolated value result is 32.7.
5. Select the larger uncorrected result obtained from Step 1, 34.5. Reference
Table IX, look under the Uncorrected Conductivity Values in % IACS column
and locate the 34.5 value. Since the column lists values for 34 and 35, you
must interpolate to determine the corrected value for 34.5. Follow rows 34
and 35 to the right until you are under the 0.040 thickness column. The
corrected values of 37.0 and 38.0 should be attained.
6. The corrected conductivity interpolated value result is 37.5.
7. The Corrected Conductivity for 0.040 inch thick 7075-T6 Clad Aluminum is
32.7 – 37.5 % IACS. These are the values that must be obtained directly from
the conductivity meter for material to be considered acceptable.
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Hardness – Thickness Chart – Aluminum Alloys
“B”
Scale
Min
Thickness
(inch)
99.5
98.4
96
94.1
92
85
85.5
82.5
79
75
70
65
58
49
39
.032
.033
.035
.036
.038
.040
.043
.046
.049
.053
.056
.060
.065
.070
.078
E&F Min
Scale Thickness
(inch)
110
109
108
107
105
103
100
98
95
90
85
80
70
60
50
40
.020
.022
.024
.026
.028
.030
.032
.035
.037
.040
.043
.048
.056
.066
.074
.082
“H”
Scale
116
114
110
109
108
106
102
Min
Thickness
(inch)
.016
.018
.020
.022
.025
.028
.032
45 T
Scale
Min
Thickness
(inch)
30 T
Scale
Min
Thickness
(inch)
71
66.5
62
57.5
53
48
43
37
31
24.5
18
11
4
.016
.017
.018
.019
.020
.021
.022
.023
.024
.025
.026
.027
.028
81.7
81.2
80
78.3
77.5
75.5
73.7
72.7
69.5
67
63.5
60
55
49
42
.013
.014
.014
.014
.015
.015
.016
.016
.017
.017
.018
.019
.020
.021
.022
15 T
Scale
92.7
92.3
91.9
91.7
90.5
89.5
88.2
87.2
86.2
85
83.5
81.7
79.5
76.5
73.2
Min
Thickness
(inch)
.009
.009
.010
.010
.010
.011
.011
.011
.012
.012
.013
.013
.014
.015
.016
NOTE: The thickness column to the right of each scale column indicates the recommended
minimum thickness that should be Rockwell Hardness tested using that load and
penetrator combination.
Table I
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Hardness Corrections to be added to B, E, and F Scale Readings to Compensate for the
Effect of Surface Curvature for Aluminum Alloys
Scale Reading
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
¼
12.5
12.5
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.5
3/8
8.5
8.0
8.0
7.5
7.5
7.0
6.5
6.0
6.0
5.5
5.5
5.0
5.0
4.5
4.0
3.5
3.5
3.0
3.0
2.5
2.5
Diameter of Curvature - Inches
½
5/8
¾
6.5
5.5
4.5
6.5
5.5
4.5
6.0
5.0
4.0
5.5
5.0
4.0
5.5
4.5
4.0
5.0
4.5
3.5
5.0
4.5
3.5
4.5
4.0
3.0
4.5
4.0
3.0
4.0
3.5
3.0
4.0
3.5
3.0
3.5
3.0
2.5
3.5
3.0
2.5
3.0
2.5
2.5
3.0
2.5
2.0
2.5
2.0
2.0
2.5
2.0
1.5
2.0
1.5
1.5
2.0
1.5
1.5
1.5
1.5
1.0
1.5
1.5
1.0
Table II
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7/8
3.5
3.5
3.5
3.5
3.5
3.0
3.0
2.5
2.5
2.5
2.5
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1
3.0
3.0
3.0
3.0
3.0
3.0
2.5
2.5
2.5
2.5
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
0.5
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Hardness Corrections to be Added to 15T, 30T and 45T Scale Readings to Compensate
for the Effect of Surface Curvature for Aluminum Alloys
Scale Reading
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
1/8
1/4
13.0
12.5
11.5
11.0
10.0
9.5
8.5
7.5
6.5
6.0
5.0
4.0
3.0
2.5
1.5
1.5
1.0
9.0
8.5
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.0
1.5
1.0
1.0
0.5
Diameter of Curvature - Inches
3/8
1/2
5/8
6.0
5.5
5.0
5.0
4.5
4.5
4.0
3.5
3.0
3.0
2.5
2.0
1.5
1.5
1.0
0.5
0
Table III
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4.5
4.5
4.0
4.0
3.5
3.5
3.0
3.0
2.5
2.5
2.0
2.0
1.5
1.0
0.5
0.5
0
3.5
3.5
3.5
3.5
3.0
3.0
2.5
2.5
2.0
2.0
1.5
1.5
1.0
0.5
0.5
0.5
0
3/4
1
3.0
3.0
2.5
2.5
2.5
2.5
2.0
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0
0
2.0
2.0
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
0.5
0.5
0.5
0
0
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Hardness and Electrical Conductivity Requirements for Aluminum Alloy Plate
Electrical Conductivity % IACS
Alloy &
Temper
2014-T451
2014-T651
2X24-T351
2X24-T851
2219-T851
2219-T87
6061-T451
6061-T651
7050-W51
7050-T7451
7050-T7651
7150-T651
7075-W51
7075-T651
7075-T7351
7075-T7651
7178-T651
7178-T7651
7475-T7351
Minimum
31.0
35.5
28.0
37.5
31.0
31.0
35.5
40.0
25.5
38.0
39.0
34.0
27.0
30.0
38.0
36.0
29.0
36.0
40.0
Upper
40.0
41.0
35.0
35.0
41.0
46.0
30.5
33.5
41.0
40.0
33.0
40.0
Maximum
34.5
41.5
32.5
42.5
43.0
50.0
29.0
43.0
43.0
36.5
34.5
42.0
41.0
42.0
44.5
RB Hardness
(Minimum)
65
78
69
74
71
77
24
47
80
82
82
86
85
78
82
87
84
78
NOTES:
1.
Aluminum, alloy plate shall be 100% electrical conductivity tested. From each
lot, perform hardness testing on the two plates having the highest and lowest
electrical conductivity values.
2.
When the electrical conductivity test value of a plate exceeds the upper value,
but is equal to or less than the maximum value, the plate must be hardness
tested for disposition.
3.
All plates tested must be within the minimum-maximum electrical conductivity
range for acceptance.
Table IV
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Hardness Requirements for Wrought Aluminum Alloys Excluding Plate
Alloy & Temper
Rockwell Hardness Scale
B
E
H
15T
30T
1100-0
1100-H12
1100-H14
1100-H16
1100-H18
3003-0
3003-H12
3003-H14
3003-H16
3003-H18
2014-0
2014-T3XX
50 MAX
46 MIN
65 MIN
67 MIN
74 MIN
65 MAX
68 MIN
80-90
88-95
65-70
66-75
70 MAX
95-100
2014-T4XX
65-70
95-100
79-86
2014-T6XX
2014-T6XX ALCLAD
2024/2124-0
2024/2124-T3XXX
2024/2124-T4XXX
2024/2124-T6XXX
78-86
76-90
86-90
85-90
64-83
64-83
72-84
102-106
101-106
70 MAX
97-106
97-106
100-106
2024/2124-T8XXX
74-87
2024/2124-T81
62-68
66-73
95 MAX
79-86
95 MAX
82-87
82-87
84-88
62-72
62-72
65-72
100-108
85-91
67-75
74-87
100-108
85-91
67-75
2024/2124-T84
81-90
104-110
86-91
71-75
2024/2124-T86
83-90
105-110
87-91
72-75
2024/2124-T3XXX ALCLAD
0.040-0.079 inch in thickness
2024/2124-T3XXX ALCLAD
0.080-0.125 inch in thickness
2024/2124-T3XXX ALCLAD
over 0.125 inch in thickness
2024/2124-T4XXX ALCLAD
0.020 – 0.039 inch in thickness
2024/2124-T4XXX ALCLAD
0.040-0.079 inch in thickness
2024/2124-T4XXX ALCLAD
0.080-0.125 inch in thickness
2024/2124-T4XXX ALCLAD
over 0.125 inch in thickness
2024-2124-T6XXX ALCLAD
0.020-0.039 inch in thickness
2024/2124-T6XXX ALCLAD
0.040-0.079 inch in thickness
2024/2124-T6XXX ALCLAD
0.080-0.125 inch in thickness
2024/2124-T6XXX ALCLAD
over 0.125 inch in thickness
58-83.5
55-83.5
52-71
93-102
79-85
57-83.5
54-83.5
52-71
93-102
82-88
70-86
64-86
62-77
Table V
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Hardness Requirements for Wrought Aluminum Alloys Excluding Plate (continued)
Alloy & Temper
Rockwell Hardness Scale
B
E
H
15T
30T
2024/2124-T8XXX ALCLAD
0.040-0.079 inch in thickness
2024/2124-T8XXX ALCLAD
0.080-0.125 inch in thickness
2219-0
2219-T3XXX
2219-T6XXX
2219-T8XXX
71-86
68-86
73 MAX
60-75
62-80
71-86
2219-T42
94-105
97-107
81-86
85 MIN
76 MIN
2224-T3XXX
71-83
97-104
2324-T39
77-86
100-106
5052-0
5052-H32
65 MAX
61-81
92 MAX
5052-H34
5052-H36
5052-H38
67-84
73-87
80-90
6061-0
6061-T4XXX
68-82
65-75
6061-T6XXX
85-97
78-82
6063-T5XXX
50-87
85-107
63-79
6063-T6XXX
70-87
95-107
68-79
66 MAX
63-74
65-75
70-77
75-79
75 MAX
7049-T73XXX
7050-T73XXX/T74XXX
7050T76XXX
7150-T6XXX
7075/7175-0
7075/7175-T6XXX
82-93
82-93
82-93
86-94
86-94
106-112
87-92
7075/7175-T73XXX
79-89
100-108
85-91
7075/7175-T736X/T74XXX
82-94
103-110
7075/7175-T76XXX
82-94
103-110
7075/7175-T6XXX ALCLAD
0.020-0.039
7075/7175-T6XXX ALCLAD
0.040-0.079 inch in thickness
7075/7175-T6XXX ALCLAD
0.080-0.125 inch in thickness
7075/7175-T6XXX ALCLAD OVER
0.125 inch in thickness
104-110
104-109
104-109
106-112
71-75
71-75
71-75
87-92
100 MAX
18 MAX
86-92
86-90
79-94
85-90
75-94
76-92
Table V
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34 MAX
54-67
59-71
63-74
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Hardness Requirements for Wrought Aluminum Alloys Excluding Plate (continued)
Alloy & Temper
B
7075/7175-T73XXX ALCLAD
0.040-0.079 inch in thickness
7075/7175/T73XXX ALCLAD
0.080-0.125 inch in thickness
7075-T73XX Hand Forgings
less than 2 inch thick
7075-T73XX Hand Forgings
2.000-3.000 inch thick
7075-T73XX Hand Forging
3.001-4.000 inch thick
7075-T 73XX Hand Forgings
greater than 4 inch thick
7075-T76XXX
0.020-0.039 inch thick
7075-T76XXX
0.040-0.079 inch thick
7075-T76XXX
0.080-0.125 inch thick
7079-T6XXX
Rockwell Hardness Scale
E
H
15T
77-89
74-89
79-89
77-89
75-89
74-89
84-92
75-94
84-92
74-94
84-92
81-93
104-112
87-92
7178-T6XXX
89-94
108-112
88-94
7178-T76XXX
84-93
104-109
85-92
Table V
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30T
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Hardness Requirements for Aluminum Alloy Castings
Alloy & Temper
Casting Type
43F
43F
195-T4
195-T4
195-T6
195-T6
220-T4
355-T6
355-T6
356-T6
A356-T6
A356-T6
A356-T6
142-T571
142-T77
142-T571
142-T61
122-T61
108F
113F
40E-T5
A380
380
218
85
85X
A360
360
Sand
Permanent Mold
Sand
Permanent Mold
Sand
Permanent Mold
Sand
Sand
Permanent Mold
QQ-A-601
Class 10 (MIL-A-21180)
Class 11
Class 12
Sand
Sand
Permanent Mold
Permanent Mold
Sand
Sand
Sand
Sand
Die Casting
Die Casting
Die Casting
Die Casting
Die Casting
Die Casting
Die Casting
Rockwell Hardness
(Minimum)
“E” Scale
30
33
73
77
77
88
77
80
88
68
80
78
72
85
78
95
97
100
56
73
77
82
81
80
78
75
78
78
NOTE: For Alloys and tempers not listed, contact the Northrop Grumman
Technical Services Laboratory for assistance.
Table VI
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Electrical Conductivity Requirements for Wrought Aluminum Alloys (Bare)
.063 Inches and Greater in Thickness (Excluding Plate)
Alloy & Temper
Range (%IACS)
1100-All
2014-0
2014-T3XX
2014-T4XX
2014-T6XX
2017-0
2017-T4XXX
2024/2124-0
2024/2124-T3XXX
2024/2124-T4XXX
2024/2124-T6XXX
2024/2124-T8XXX
2219-0
2219-T3XXX
2219-T6XXX
2219-T8XXX
2219-T42
2224-T3XXX
2324-T39
3003-0
3003-H12,H14,H16,H18
5052-ALL
6061-0
6061-T4XXX
6061-T6XXX
6063-T5XXX
6063-T6XXX
7049-0
7049-T73XXX
7049-T76XXX
7050-T73651/T7451
7050-T73652/T7452
7050-T76XXX
7075/7175-0
7075/7175-WXXX
7075/7175-T6XXX
7075/7175-T7XXX
7079-T6XXX
7150-T651
7150-T651X
7178-T6XXX
7178-T76XXX
57.0-61.5
48.5-51.0
31.5-34.5
31.5-34.5
35.0-40.0
48.5-51.0
31.5-35.0
46.0-49.0
28.5-33.0
28.0-32.0
35.0-39.0
35.0-42.0
44.0-51.0
26.0-31.0
31.0-35.0
31.0-35.0
28.0-32.0
29.0-32.0
29.0-32.0
44.5-50.0
37.5-51.1
33.5-37.5
47.0-51.0
38.0-44.0
42.0-51.0
50.0-60.0
50.0-60.0
44.0-50.0
38.0 MINIMUM
38.0-44.0
40.0-44.0
40.0-44.0
39.0-44.0
44.5-47.8
28.5-30.5
29.5-34.5
38.0-42.0
30.0-35.0
34.0 MINIMUM
32.0 MINIMUM
29.5-33.0
36.5-40.0
Table VII
Note:
Conductivity of 7050-T76511 aluminum alloy per AMS 4340.
Conductivity of this material is acceptable below the required minimum of 39.0 if the
requirements of section 3.3.2.2 of AMS-4340 are satisfactory.
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1.
2.
3.
4.
Electrical Conductivity for Bare Thin Gauge Aluminum
Special Conditions Procedure #1 (Hocking Autosigma 2000)
Find the minimum material acceptance limit values (uncorrected) in the left hand
column of table VIII. Read across the columns until you are at the applicable
part/material thickness. Note this value as the corrected minimum acceptance
limit.
Repeat the above procedure to obtain the corrected maximum acceptance limit,
except use the maximum material acceptance limit value (uncorrected)
For material acceptance limit values (uncorrected) that have a fraction of a percent
IACS, the corrected values can be obtained by interpolation. Use the corrected
table values on both sides of the fractional, uncorrected part/material value being
evaluated and an appropriate rounding technique.
The measured conductivity values obtained from the inspection part/material shall
be between the corrected acceptance limits to be acceptable.
Uncorrected
Conductivity
Values in %
IACS
Single Thickness (Gauge), Inches
0.016
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
34.0
35.0
36.0
37.0
38.0
39.0
40.0
41.0
42.0
43.0
12.5
14.0
15.0
16.0
17.5
18.5
19.5
21.0
22.0
23.0
24.5
25.5
26.5
28.0
29.0
30.0
31.5
32.5
0.020
0.025
0.032
0.040
0.050
0.063 &
above
Corrected Conductivity Values On Percent IACS
19.0
20.0
21.5
22.5
24.0
25.0
26.5
28.0
29.0
30.5
31.5
33.0
34.0
35.5
36.5
38.0
39.0
40.5
23.5
25.0
26.5
28.0
29.5
31.0
32.0
33.5
35.0
36.5
37.5
39.0
40.5
41.5
43.0
44.5
45.5
47.0
27.5
29.0
30.0
31.0
32.5
33.5
34.5
35.5
36.5
38.0
39.0
40.0
41.0
42.0
43.5
44.5
45.5
46.5
Table VIII
(continued on next page)
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28.0
29.0
30.0
31.0
32.0
33.0
34.0
35.0
35.5
36.5
37.5
38.5
39.5
40.5
41.5
42.5
43.5
44.0
26.5
27.5
28.5
29.5
30.5
31.5
32.5
33.5
34.5
35.5
36.5
37.0
38.0
39.0
40.0
41.0
42.0
43.0
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
34.0
35.0
36.0
37.0
38.0
39.0
40.0
41.0
42.0
43.0
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Integrated Systems Eastern Region (ISER) - Bethpage
Electrical Conductivity for Bare Thin Gauge Aluminum
(continued from previous page)
Uncorrected
Conductivity
Values In %
IACS
Single Thickness (Gauge), Inches
0.016
44.0
45.0
46.0
47.0
48.0
49.0
50.0
51.0
52.0
53.0
54.0
55.0
56.0
57.0
58.0
59.0
60.0
61.0
62.0
63.0
64.0
65.0
34.0
35.0
36.0
37.5
38.5
40.0
41.0
42.5
43.5
45.0
46.0
47.0
48.5
49.5
51.0
52.0
53.5
54.5
56.0
57.0
58.5
60.0
0.020
0.025
0.032
0.040
0.050
0.063 &
above
Corrected Conductivity Values On Percent IACS
41.5
43.0
44.0
45.5
46.5
48.0
49.0
50.0
51.5
52.5
54.0
55.0
56.5
57.5
58.5
60.0
61.0
62.5
63.5
64.5
66.0
67.0
48.0
49.5
50.5
52.0
53.0
54.5
55.5
57.0
58.0
59.0
60.5
61.5
62.5
63.5
65.0
66.0
67.0
68.0
69.0
70.5
71.5
72.5
47.5
48.5
49.5
51.0
52.0
53.0
54.0
55.0
56.0
57.0
58.0
59.0
60.0
61.0
62.0
63.0
64.0
65.0
66.0
67.0
68.0
69.0
45.0
46.0
47.0
48.0
49.0
50.0
51.0
52.0
53.0
54.0
55.0
55.5
56.5
57.5
58.5
59.5
60.5
61.5
62.5
63.5
64.5
65.5
44.0
45.0
46.0
47.0
48.0
49.0
50.0
51.0
52.0
53.0
53.5
54.5
55.5
56.5
57.5
58.5
59.5
60.5
61.5
62.5
63.5
64.5
44.0
45.0
46.0
47.0
48.0
49.0
50.0
51.0
52.0
53.0
54.0
55.0
56.0
57.0
58.0
59.0
60.0
61.0
62.0
63.0
64.0
65.0
NOTES:
1. Follow the inspection thickness limitations for your conductivity test instrument.
If you do not know your test instrument thickness limitation, conductivity
readings for material under 0.063 inch in thickness shall not be used to
accept/reject parts/materials unless Northrop Grumman Technical Services
Laboratory approved correction factors are supplied.
Table VIII
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Electrical Conductivity for 2024, 7075, 7079, & 7178 Clad Aluminum Alloys
(Hocking Autosigma 2000)
Uncorrected
Conductivity
Values In %
IACS
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Single Thickness (Gauge), Inches
.016
.020
.025
.032
.040
.050
.063
.080
.090
.100
.110
.125
.140
.160
Corrected Conductivity Values in Percent IACS
14.5
20.5
26.5
29.5
29.5
29.0
27.5
28.5
28.5
29.0
29.5
30.0
30.5
31.5
16.0
21.5
28.0
30.5
30.5
30.0
28.5
29.0
29.5
30.0
30.5
31.0
31.5
32.5
17.0
23.0
29.0
32.0
31.5
30.5
29.0
30.0
30.5
31.0
31.5
32.0
32.5
33.0
18.0
24.0
30.5
33.0
32.5
31.5
30.0
31.0
31.5
32.0
32.0
32.5
33.0
34.0
19.0
25.5
31.5
34.0
33.0
32.5
31.0
32.0
32.5
32.5
33.0
33.5
34.0
34.5
20.5
27.0
33.0
35.0
34.0
33.5
32.0
33.0
33.0
33.5
34.0
34.5
35.0
35.5
21.5
28.0
34.0
36.0
35.0
34.5
33.0
34.0
34.0
34.5
34.5
35.0
35.5
36.5
22.5
29.5
35.5
37.0
36.0
35.0
34.0
34.5
35.0
35.5
35.5
36.0
36.5
37.0
23.5
30.5
36.5
38.0
37.0
36.0
35.0
35.5
36.0
36.0
36.5
37.0
37.5
38.0
25.0
31.5
38.0
39.0
38.0
37.0
36.0
36.5
37.0
37.0
37.5
37.5
38.0
38.5
26.0
33.0
39.0
40.0
38.5
38.0
36.5
37.5
37.5
38.0
38.0
38.5
39.0
39.5
27.0
34.0
40.0
41.5
39.5
39.0
37.5
38.5
38.5
39.0
39.0
39.5
40.0
40.0
28.5
35.5
41.5
42.5
40.5
39.5
38.5
39.5
39.5
39.5
40.0
40.5
40.5
41.0
29.5
36.5
42.5
43.5
41.5
40.5
39.5
40.0
40.5
40.5
41.0
41.0
41.5
42.0
30.5
38.0
44.0
44.5
42.5
41.5
40.5
41.0
41.5
41.5
41.5
42.0
42.0
42.5
31.5
39.0
45.0
45.5
43.5
42.5
41.5
42.0
42.0
42.5
42.5
43.0
43.0
43.5
33.0
40.5
46.0
46.5
44.0
43.5
42.5
43.0
43.0
43.0
43.5
43.5
44.0
44.0
34.0
41.5
47.5
47.5
45.0
44.0
43.5
44.0
44.0
44.0
44.0
44.5
44.5
45.0
35.0
43.0
48.5
48.5
46.0
45.0
44.0
44.5
45.0
45.0
45.0
45.5
45.5
46.0
36.5
44.0
49.5
49.5
47.0
46.0
45.0
45.5
46.0
46.0
46.0
46.0
46.5
46.5
37.5
45.0
50.5
50.5
48.0
47.0
46.0
46.5
46.5
46.5
47.0
47.0
47.0
47.5
39.0
46.5
52.0
51.5
48.5
48.0
47.0
47.5
47.5
47.5
47.5
48.0
48.0
48.0
40.0
47.5
53.0
52.5
49.5
48.5
48.0
48.5
48.5
48.5
48.5
48.5
49.0
49.0
41.0
49.0
54.0
53.5
50.5
49.5
49.0
49.5
49.5
49.5
49.5
49.5
49.5
49.5
42.5
50.0
55.0
54.5
51.5
50.5
50.0
50.0
50.0
50.5
50.5
50.5
50.5
50.5
Table IX
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Electrical Conductivity for 2014, 2219 Clad Aluminum Alloys
(Hocking Autosigma 2000)
Uncorrected
Conductivity
Values In %
IACS
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
Single Thickness (Gauge), Inches
.016
.020
.025
.032
.040
.050
.063
.080
.090
.100
.110
.125
.140
.160
Corrected Conductivity Values in Percent IACS
19.0
25.0
28.5
30.5
29.5
29.0
29.5
31.5
32.5
29.0
29.5
30.0
30.5
31.5
20.0
26.0
30.0
31.5
30.5
30.0
30.5
32.5
33.0
30.0
30.5
31.0
31.5
32.5
21.0
27.5
31.0
33.0
31.5
30.5
31.5
33.0
34.0
31.0
31.5
32.0
32.5
33.0
22.0
28.5
32.5
34.0
32.5
31.5
32.0
34.0
34.5
32.0
32.0
32.5
33.0
34.0
23.0
30.0
33.5
35.0
33.0
32.5
33.0
34.5
35.5
32.5
33.0
33.5
34.0
34.5
24.0
31.0
34.5
36.0
34.0
33.5
34.0
35.5
36.0
33.5
34.0
34.5
35.0
35.5
25.0
32.0
36.0
37.0
35.0
34.5
35.0
36.5
37.0
34.5
34.5
35.0
35.5
36.5
25.5
33.5
37.0
38.0
36.0
35.0
36.0
37.0
37.5
35.5
35.5
36.0
36.5
37.0
26.5
34.5
38.0
39.0
37.0
36.0
36.5
38.0
38.5
36.0
36.5
37.0
37.5
38.0
27.5
36.0
39.5
40.0
38.0
37.0
37.5
38.5
39.0
37.0
37.5
37.5
38.0
38.5
28.5
37.0
40.5
41.0
38.5
38.0
38.5
39.5
40.0
38.0
38.0
38.5
39.0
39.5
29.5
38.0
41.5
42.0
39.5
39.0
39.5
40.0
40.5
39.0
39.0
39.5
40.0
40.0
30.5
39.5
42.5
43.0
40.5
39.5
40.5
41.0
41.5
39.5
40.0
40.5
40.5
41.0
32.0
40.5
44.0
44.0
41.5
40.5
41.0
42.0
42.0
40.5
41.0
41.0
41.5
42.0
33.0
41.5
45.0
45.0
42.5
41.5
42.0
42.5
43.0
41.5
41.5
42.0
42.0
42.5
34.0
42.5
46.0
46.0
43.5
42.5
43.0
43.5
43.5
42.5
42.5
43.0
43.0
43.5
35.0
44.0
47.0
47.0
44.0
43.5
44.0
44.0
44.5
43.0
43.5
43.5
44.0
44.0
36.0
45.0
48.5
48.0
45.0
44.0
45.0
45.0
45.5
44.0
44.0
44.5
44.5
45.0
37.0
46.0
49.5
49.0
46.0
45.0
45.5
46.0
46.0
45.0
45.0
45.5
45.5
46.0
38.0
47.5
50.5
50.0
47.0
46.0
46.5
46.5
47.0
46.0
46.0
46.0
46.5
46.5
39.0
48.5
51.5
50.5
48.0
47.0
47.5
47.5
47.5
46.5
47.0
47.0
47.0
47.5
40.0
49.5
52.5
51.5
48.5
48.0
48.5
48.0
48.5
47.5
47.5
48.0
48.0
48.0
41.0
50.5
53.5
52.5
49.5
48.5
49.0
49.0
49.0
48.5
48.5
48.5
49.0
49.0
42.5
52.0
54.5
53.5
50.5
49.5
50.0
49.5
50.0
49.5
49.5
49.5
49.5
49.5
43.5
53.0
56.0
54.5
51.5
50.5
51.0
50.5
50.5
50.5
50.5
50.5
50.5
50.5
44.5
54.0
57.0
55.5
52.5
51.5
52.0
51.5
51.5
51.0
51.0
51.0
51.0
51.5
Table X
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Electrical Conductivity for 3003 and 6061 Clad Aluminum Alloys (Table XI)
(Hocking Autosigma 2000)
Special Conditions Procedure #2 (Hocking Autosigma 2000)
1. Find the minimum material acceptance limit value (uncorrected) in the left hand
column of the table. Read across the columns until you are at the part/material
thickness. Note this value as the corrected minimum acceptance limit.
2. Find the maximum material acceptance limit value (uncorrected) in the left hand
column of the table. Read across the columns until you are at the part/material
thickness. Note this value as the corrected maximum acceptance limit.
3. For material acceptance limit values (uncorrected) that have a fraction of a percent
IACS, the corrected values can be obtained by interpolation. Use the corrected table
values on both sides of the fractional, uncorrected part/material value being evaluated
and an appropriate rounding technique.
4. The measured conductivity values obtained from the inspection part/material shall be
between the corrected acceptance limits to be acceptable.
Notes: Conductivity readings on clad material shall not be used to accept/reject parts unless:
1. The following clad correction factors as determined on the Hocking Autosigma 2000
are applied.
2. Clad has been removed from the inspection area and subsequent conductivity testing
is performed on bare material.
a.
Clad removal and restoration shall be coordinated with the applicable Northrop
Grumman Engineering Section.
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Electrical Conductivity for 3003 and 6061 Clad Aluminum Alloys
(Hocking Autosigma 2000)
Uncorrected
Single Thickness (Gauge), Inches
Conductivity .016 .020 .025 .032 .040 .050 .063 .080 .090 .100 .110 .125
Values In %
Corrected Conductivity Values in Percent IACS
IACS
26.0 33.0 39.0 40.0 38.5 38.0 38.5 39.5 40.0 40.5 41.0 41.5
36
27.0 34.0 40.0 41.5 39.5 39.0 39.5 40.0 40.5 41.0 41.5 42.5
37
28.5 33.5 41.5 42.5 40.5 39.5 40.5 41.0 41.5 42.0 42.5 43.0
38
29.5 36.5 42.5 43.5 41.5 40.5 41.0 42.0 42.0 42.5 43.0 43.5
39
30.5 38.0 44.0 44.5 42.5 41.5 42.0 42.5 43.0 43.5 44.0 44.5
40
31.5 39.0 45.0 45.5 43.5 42.5 43.0 43.5 43.5 44.0 44.5 45.0
41
33.0 40.5 46.0 46.5 44.0 43.5 44.0 44.0 44.5 45.0 45.0 45.5
42
34.0 41.5 47.5 47.5 45.0 44.0 45.0 45.0 45.5 45.5 46.0 46.5
43
35.0 43.0 48.5 48.5 46.0 45.0 45.5 46.0 46.0 46.5 46.5 47.0
44
36.5 44.0 49.5 49.5 47.0 46.0 46.5 46.5 47.0 47.0 47.0 47.5
45
37.5 45.0 50.5 50.5 48.0 47.0 47.5 47.5 47.5 47.5 48.0 48.0
46
39.0 46.5 52.0 51.5 48.5 48.0 48.5 48.0 48.5 48.5 48.5 49.0
47
40.0 47.5 53.0 52.5 49.5 48.5 49.0 49.0 49.0 49.0 49.5 49.5
48
41.0 49.0 54.0 53.5 50.5 49.5 50.0 49.5 50.0 50.0 50.0 50.0
49
42.5 50.0 55.0 54.5 51.5 50.5 51.0 50.5 50.5 50.5 50.5 51.0
50
43.5 51.0 56.5 55.0 52.5 51.5 52.0 51.5 51.5 51.5 51.5 51.5
51
45.0 52.5 57.5 56.0 53.0 52.0 52.5 52.0 52.0 52.0 52.0 52.0
52
46.0 53.5 58.5 57.0 54.0 53.0 53.5 53.0 53.0 53.0 53.0 53.0
53
47.0 55.0 59.5 58.0 55.0 54.0 54.5 53.5 53.5 53.5 53.5 53.5
54
48.5 56.0 60.5 59.0 56.0 55.0 55.5 54.5 54.5 54.5 54.0 54.0
55
49.5 57.0 61.5 60.0 57.0 55.5 56.0 55.0 55.0 55.0 55.0 54.5
56
Table XI
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.140
.160
42.5
43.5
43.0
44.0
43.5
44.5
44.5
45.0
45.0
45.5
45.5
46.0
46.0
46.5
46.5
47.5
47.5
48.0
48.0
48.5
48.5
49.0
49.0
49.5
49.5
50.0
50.5
50.5
51.0
51.0
51.5
51.5
52.0
52.0
53.0
53.0
53.5
53.5
54.0
54.0
54.5
54.5
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Integrated Systems Eastern Region (ISER) - Bethpage
Electrical Conductivity Correction Factors for Curved Surfaces (Table XII)
Special Conditions Procedure #3 – Hocking Autosigma 2000
a. Use a probe fixture that is made for curved surfaces.
b. If a probe fixture is not available, use the following technique for measuring
the conductivity:
1. Place the probe on the part surface.
2. Slowly rock the probe back and forth and watch for the maximum reading.
3. Record the maximum reading.
c. For part/material thickness equal to or greater than 0.063 inch, do the
following:
1. Find the minimum material acceptance limit value (uncorrected) in the left
hand column of Table XII. Read across the columns until you are at the
curvature diameter. Note this value as the corrected minimum acceptance
limit.
2. Find the maximum material acceptance limit value (uncorrected) in the left
hand column of Table of Table XII. Read across the columns until you are
at the curvature diameter. Note this value as the corrected maximum
acceptance limit.
3. For material acceptance limit values (uncorrected) that have a fraction of a
percent IACS, the correction values can be obtained by interpolation. Use
the corrected table values on both sides of the fractional, uncorrected
curvature diameter value being evaluated and an appropriate rounding
technique.
d. For part/material thickness less than 0.063 inch, do the following:
1. Go to Table VIII and obtain the minimum and maximum acceptance limit
values for thin gauge material by following special conditions procedure
#1. The resultant corrected values from the thin gauge table become the
uncorrected values for the surface curvature Table XII.
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Electrical Conductivity Correction Factors for Curved Surfaces (Table XII continued)
2. Find the minimum material acceptance limit value (uncorrected) in the left
hand column of Table XII. Read across the columns until you are at the
curvature diameter. Note this value as the corrected minimum acceptance
limit.
3. Find the maximum material acceptance limit value (uncorrected) in the left
hand column of Table XII. Read across the columns until you are at the
curvature diameter. Note this value as the corrected maximum acceptance
limit.
4. For material acceptance limit values (uncorrected) that have a fraction of a
percent IACS, the correction values can be obtained by interpolation. Use
the corrected table values on both sides of the fractional, uncorrected
curvature diameter value being evaluated and an appropriate rounding
technique.
e. The measured conductivity values obtained from the inspection part/material
shall be between the corrected acceptance limits to be acceptable.
NOTES:
1.
For test instruments other than Hocking Autosigma 2000, conductivity
readings on parts/materials with a convex surface curvature of less
than 6 inches in diameter or a concave surface curvature of less than 20
inches in diameter shall not be used to accept/reject unless the
applicable curvature correction factors are available for the specific
conductivity test instrument and have been approved by the Technical
Services Laboratory.
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Electrical Conductivity Correction Factors for Curved Surfaces
Uncorrected
Conductivity
Values In
IACS
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
Diameter, Inches
0.250
0.375
0.500
0.750
1.000
1.500
2.000
3.000
3.500
4.000
5.000
12.0
12.5
13.5
14.0
14.5
15.5
16.0
16.5
17.0
18.0
18.5
19.0
20.0
20.5
21.0
22.0
22.5
23.0
23.5
24.5
25.0
25.5
26.5
27.0
27.5
28.5
29.0
29.5
30.0
31.0
31.5
32.0
33.0
33.5
34.0
35.0
35.5
36.0
36.5
37.5
38.0
15.5
16.5
17.0
18.0
18.5
19.5
20.5
21.0
22.0
22.5
23.5
24.5
25.0
26.0
26.5
27.5
28.5
29.0
30.0
30.5
31.5
32.5
33.0
34.0
34.5
35.5
36.5
37.0
38.0
38.5
39.5
40.5
41.0
42.0
42.5
43.5
44.5
45.0
46.0
46.5
47.5
17.5
18.0
19.0
20.0
21.0
21.5
22.5
23.5
24.0
25.0
26.0
27.0
27.5
28.5
29.5
30.5
31.0
32.0
33.0
34.0
34.5
35.5
36.5
37.0
38.0
39.0
40.0
40.5
41.5
42.5
43.5
44.0
45.0
46.0
47.0
47.5
48.5
49.5
50.0
51.0
52.0
19.0
20.0
20.5
21.5
22.5
23.5
24.5
25.5
26.0
27.0
28.0
29.0
30.0
31.0
32.0
32.5
33.5
34.5
35.5
36.5
37.5
38.0
39.0
40.0
41.0
42.0
43.0
43.5
44.5
45.5
46.5
47.5
48.5
49.5
50.0
51.0
52.0
53.0
54.0
55.0
55.5
19.5
20.5
21.5
22.5
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
31.5
32.5
33.5
34.5
35.5
36.5
37.5
38.5
39.5
40.0
41.0
42.0
43.0
44.0
45.0
46.0
47.0
48.0
48.5
49.5
50.5
51.5
52.5
53.5
54.5
55.5
56.0
57.0
20.0
21.0
22.0
23.0
23.5
24.5
25.5
26.5
27.5
28.5
29.5
30.5
31.5
32.5
33.5
34.5
35.0
36.0
37.0
38.0
39.0
40.0
41.0
42.0
43.0
44.0
45.0
46.0
47.0
47.5
48.5
49.5
50.5
51.5
52.5
53.5
54.5
55.5
56.5
57.5
58.5
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
28.5
29.5
30.5
31.5
32.5
33.5
34.5
35.5
36.5
37.5
38.5
39.5
40.5
41.5
42.0
43.0
44.0
45.0
46.0
47.0
48.0
49.0
50.0
51.0
52.0
53.0
54.0
55.0
56.0
56.5
57.5
59.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
33.5
34.5
35.5
36.5
37.5
38.5
39.5
40.5
41.5
42.5
43.5
44.5
45.5
46.5
47.5
48.5
49.5
5.0.0
51.0
52.0
53.0
54.0
55.0
56.0
57.0
58.0
59.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
34.0
34.5
35.5
36.5
37.5
38.5
39.5
40.5
41.5
42.5
43.5
44.5
45.5
46.5
47.5
48.5
49.5
50.5
51.5
52.0
53.0
54.0
55.0
56.0
57.0
58.0
59.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
34.0
35.0
35.5
36.5
37.5
38.5
39.5
40.5
41.5
42.5
43.5
44.5
45.5
46.5
47.5
48.5
49.5
50.5
51.5
52.5
53.0
54.0
55.0
56.0
57.0
58.0
59.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
28.0
29.0
30.0
31.0
32.0
33.0
34.0
35.0
36.0
36.5
37.5
38.5
39.5
40.5
41.5
42.5
43.5
44.5
45.5
46.5
47.5
48.5
49.5
50.5
51.5
52.5
53.0
54.0
55.0
56.0
57.0
58.0
59.0
Table XII
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Hardness Thickness Chart – Steels
Thickness
Inches
.006
.008
.010
.012
.014
.016
.018
.020
.022
.024
.026
.028
.030
.032
.034
.036
.038
.040
Scale
15N
92
90
88
83
76
68
X
X
X
X
X
X
X
X
X
X
X
X
30N
82
80
74
66
57
47
X
X
X
X
X
X
X
X
X
45N
77
74
72
68
63
58
51
37
20
X
X
X
X
X
X
A
86
84
82
78
76
71
67
60
X
X
X
X
X
D
77
75
72
68
63
58
51
43
X
X
X
C
69
67
65
62
57
52
45
37
28
20
Table XIII
Per Wilson (Rockwell) Chart No. 55
NOTES:
1. Any greater thickness and hardness can be safely tested on the indicated scale.
2. “X” means no minimum hardness.
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Corrections to be added to A & C Scale Reading to Compensate for the Effect of
Surface Curvature
Scale
Reading
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
¼
3/8
6.0
5.5
5.0
4.0
3.5
3.0
2.5
2.0
1.5
1.5
1.0
1.0
0.5
0.5
0.5
4.5
4.0
3.5
3.0
2.5
2.0
2.0
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0
Diameter of Curvature – Inches
½
5/8
¾
3.5
3.0
2.5
2.0
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
2.5
2.5
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
Table XIV
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2.0
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
7/8
1
1.5
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
0
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
0
0
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Corrections to be added to 15N, 30N and 45N Scale Reading to Compensate for the
Effect of Surface Curvature
Scale
Reading
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
1/8
¼
6.0
5.5
5.5
5.0
4.5
4.0
3.5
3.5
3.0
2.5
2.0
1.5
1.0
0.5
3.0
3.0
3.0
2.5
2.5
2.0
2.0
2.0
1.5
1.5
1.0
1.0
0.5
0.5
Diameter of Curvature – Inches
3/8
½
5/8
2.0
2.0
2.0
2.0
1.5
1.5
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
1.5
1.5
1.5
1.5
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
Table XV
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1.5
1.5
1.0
1.0
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
0
¾
1
1.5
1.5
1.0
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
0
0
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Hardness Requirements for Wrought 300 Series Stainless Steel
(refer to notes 1 and 2)
Condition
Annealed
¼ Hard
½ Hard
¾ Hard
Full Hard
B
95 Maximum
Rockwell Hardness
C
15N
25-34
33-40
39 Minimum
41 Minimum
73-78
77-81
80 Minimum
82 Minimum
NOTES:
1. This table is applicable to the following grades of stainless steel –301, 302,
303, 304/304L, 316/316L, 321 and 347.
2. Procurement and acceptable of these stainless steels are based on tensile
properties only. The hardness values, as listed above, are not adequate for
rejection but are meant as a guide. Material with hardness readings below the
minimums or above the maximums shown in this table shall be submitted to
the Technical Services Laboratory for verification.
Table XVI
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Hardness to Tensile Strength Values for Wrought Carbon and Low Alloy Steels
Heat Treat
Condition or
Tensile
Strength Range
(PSI)
Annealed (1)
Normalized (1)
125/150 KSI
150/165 KSI
165/180 KSI
180/200 KSI
200/220 KSI
220/240 KSI
240/260KSI
260/280 KSI
280/305 KSI
(1)
Rockwell Scale
B
Brinell Scale
C
Diameter of
Impression
Hardness
Number
27-32
33-37
37-40
39-42
43-46
46-49
49-52
50-53
53-56
3.73-3.50
3.45-3.23
3.28-3.16
3.20-3.09
3.05-2.94
2.94-2.84
265-302
311-345
345-373
363-391
401-432
432-464
The hardness of annealed and normalized steels can vary greatly depending upon
alloy and processing parameters. A review of drawings, specifications and purchase
orders should be performed for specific requirements.
Table XVII
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Approximate Equivalent Hardness Values for Steel
Rockwell Hardness Scale
C
A
D
15N
30N
45N
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
60.5
61.0
61.5
62.0
62.4
62.8
63.3
63.8
64.3
64.7
65.3
65.8
66.3
66.8
67.4
67.9
68.4
68.9
69.4
69.9
70.4
70.9
71.6
72.0
72.5
73.1
73.6
74.1
74.7
75.2
75.9
76.3
76.8
77.4
78.0
78.5
40.1
40.9
41.6
42.1
43.1
43.8
44.6
45.2
46.1
47.0
47.7
48.4
49.2
50.0
50.8
51.5
52.3
53.1
53.8
54.6
55.4
56.2
56.9
57.7
58.5
59.2
60.0
60.8
61.4
62.1
63.1
63.8
64.6
65.4
66.1
66.9
69.4
69.9
70.5
71.0
71.6
72.2
72.8
73.3
73.9
74.5
75.0
75.6
76.1
76.6
77.2
77.7
78.3
78.8
79.4
79.9
80.4
80.9
81.5
82.0
82.5
83.0
83.5
83.9
84.5
85.0
85.5
85.9
86.4
86.9
87.4
87.9
41.5
42.3
43.2
44.0
45.0
45.9
46.8
47.7
48.6
49.5
50.4
51.3
52.1
53.3
54.2
55.0
55.9
56.8
57.7
58.6
59.5
60.4
61.3
62.2
63.1
64.0
64.8
65.8
66.7
67.6
68.5
69.4
70.2
71.2
72.0
73.0
19.6
20.7
22.0
23.1
24.3
25.5
26.7
27.8
28.9
30.1
31.3
32.5
33.7
34.9
36.1
37.2
38.4
39.6
40.8
41.9
43.1
44.3
45.5
46.7
47.8
49.0
50.3
51.4
52.5
53.8
55.0
56.1
57.4
58.6
59.8
60.9
Table XVIII
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Hardness Test Frequency – (for steel)
Heat Treating Operation
After the final operation (hardening and
tempering, aging, etc.)
After normalizing or annealing, when it is
intermediate and not a final heat treating
operation.
Thermal processing after the final hardening
operation (stress relieving, hot or warm
straightening, baking prior to plating, etc.)
Thermal processing after shot peening,
plating, painting, baking after plating, drying,
etc.
Hardness Test Frequency – see note (1)
Every part – see notes (2) and (3)
One part per heat treat load
One part heat treat load
Not required
Notes:
1. Hardness testing shall be performed in the part’s heaviest section that is suitable and
not detrimental to the function of the part.
2. Contact the Northrop Grumman Technical Services Laboratory when hardness
testing would be destructive or impractical to accomplish, e.g., large quantities of
nuts and bolts.
3. When hardness testing would be destructive or impractical, the Quality Services
Laboratory will select a sampling plan in conjunction with cognizant engineering.
Table XIX
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Hardness Requirements for Cast Magnesium Alloys
Alloy and Temper
AZ63-T5
AZ63-T4
AZ63-T6
AZ81-T4
AZ91C-T4
AZ91C-T6
AZ92A-T4
AZ92A-T5
AZ92A-T6
Rockwell “E” Hardness (Minimum)
57
56
76
60
60
72
60
65
77
Table XX
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Hardness Requirements for Copper Alloys
Alloy
Condition
Form
Cu
Annealed
Annealed
Annealed
Cond.A
Cond.H
Cond.H
Cond.H
Cond. AT
Cond. HT
Cond. HT
Cond. HT
Cond.A
Cond.A
Cond.A
Cond.A
Cond. ¼ H
Cond. ¼ H
Cond. ½ H
Cond. ½ H
Cond. ½ H
Cond.H
Cond.H
Cond. AT
Cond. AT
Cond. AT
Cond. ¼ H
Cond. ¼ H
Cond. ¼ H
Cond. ½ H
Cond. ½ H
Cond. ½ H
Cond. HT
Cond. HT
Cond. HT
Sheet to .019
A
Cu
Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
Be Cu
B
Rockwell Hardness Scale
C
E
15N
15T
Sheet over .020
65 max
Bar
50 max
Bar over .124
45-85
Bar .125 - .375
91-103
Bar .376 – 1.000
91-102
Bar over 1.000
88-101
Bar over .124
34-40
Bar .124 - .375
39-45
Bar .375 – 1.000
38-44
Bar over 1.000
37-43
Sheet .010 - .030
74-86
Sheet .031 - .050
46-69
Sheet .051 - .075
82-101
Over .075
45-79
Sheet .010 - .031
66-75
Sheet Over .031
74-90
Sheet .010 - .020
88.5-91.5
Sheet .021 - .045
74-80
Sheet over .045
86-96
Sheet .010 - .031
80-83
Sheet over .031
96-102
Sheet .010 - .020
Sheet .021 - .065
77 min
67 min
Sheet over .065
34 min
Sheet .010 - .019
Sheet .020 - .049
78 min
68 min
Sheet over .049
36 min
Sheet .010 - .020
Sheet .021 - .060
80 min
69 min
Sheet over .060
38 min
Sheet .010 - .019
Sheet .020 - .049
Sheet over .049
80 min
70 min
39 min
See notes on next page
Table XXI
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30T
68 max
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Notes for Table XXI:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Alloy (Be Cu) is Beryllium Copper, and Alloy (Cu) is Copper.
Condition A – Solution Heat Treated
Condition AT – Solution Heat Treated and Aged
Condition H – Hard Cold Rolled
Condition HT – Hard Cold Rolled and Aged
Condition ¼ H – ¼ Hard Cold Rolled
Condition ¼ HT – ¼ Hard Cold Rolled and Aged
Condition ½ H – ½ Hard Cold Rolled
Condition ½ HT – ½ hard Cold Rolled and Aged
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