GENERAL ELECTRIC
New Issue
C50E74
Revision S-1
TRANSPORTATION SYSTEMS BUSINESS DIVISION
SPECIFICATION AND PROPERTIES
Orders and Correspondence Must Specify Complete Number
TITLE: Diesel Engine exhaust Castings
Scope:
This material specification is for components produced as an
x Martensitic stainless steel investment castings
x Similar to ACI CA6_NM and ASTM A743 grade CA6_NM (J91540).
Referenced documents:
The following documents form part of this specification to the extent that they are specified herein.
ASTM A488 Standard Practice for Steel Castings, Welding, Qualifications of Procedures and
Personnel
ASTM A743 Standard Specification for Castings, Iron Chromium Nickel, Corrosion Resistant for
General Applications
ASTM A957 Specification for Investment Castings, Steel and Alloy, Common Requirements for
General Industrial Use
ASTM A997 Standard Practice for Investment Castings, Surface Acceptance Standards, Visual
Standards
ASTM E1742 Radiographic Examination
ASTM E192 Reference Radiographs of Investment Steel Castings for Aerospace Application
AMS 2175
Castings, Classification and Inspection of
Requirements:
General:
The castings shall be produced using the investment casting process.
Each part number shall have a casting
x Manufacturing process plan
x Characteristic control plan (CCP). This shall include details of tooling, waxing, shell
manufacturing and refractories used with buildup methods, melting and pouring, and
cleaning and inspection/ repair methods used in the manufacture of individual parts. The CCP
shall be available to GETS quality/engineering and sourcing personal as part of both NCI and
audit tasks.
x Evidence of conformance to both shall be used to satisfy any NCI or audits carried out by the
purchaser
x Weld Repair of castings shall be using qualified welding procedures and qualified welders per
ASTM A488
x The requirements of ASTM A957 form an integral part of this specification.
x Each casting shall be marked at a location indicated per the part drawing
Date of Issue Written By
Jan15,2012
AW Giammarise
Appro
d
Mgr. M & P Lab
A. W. Giammarise
Page 1 of 5
GENERAL ELECTRIC
New Issue
C50E74
Revision S-1
TRANSPORTATION SYSTEMS BUSINESS DIVISION
SPECIFICATION AND PROPERTIES
Orders and Correspondence Must Specify Complete Number
TITLE: Diesel Engine exhaust Castings
Chemical Composition:
x The grade shall be CA6_NM per ASTM A743 with the following additional residual limits per
Table 1:
Table 1.
Additional Residual Element limits.
Additional Residual
Element
Phosphorus
x
x
% by weight
Max
0.015
Heat Analysis shall be obtained and reported for each heat per ASTM A957.
Product Analysis may be made by purchaser per ASTM A957
Heat Treatment
Shall be per A743/A743M Table 1, Heat Treat Requirements, except final temper:
x Heat to 1850°F [1010°C] minimum, air cool to 200°F [95°C] or lower prior to any optional
intermediate temper and prior to the final temper.
x The final temper shall be not less 1125°F (607C)
Mechanical Properties
Each heat of steel shall have a representative test coupon separately cast to determine conformance
with the tensile test requirements and reported. The test coupon shall be per ASTM A957, figure 4.
The required mechanical properties shall be as listed here in Table 2. The properties herein are as
cast and thermally treated properties.
Date of Issue Written By
Jan15,2012
AW Giammarise
Appro
d
Mgr. M & P Lab
A. W. Giammarise
Page 2 of 5
GENERAL ELECTRIC
New Issue
C50E74
Revision S-1
TRANSPORTATION SYSTEMS BUSINESS DIVISION
SPECIFICATION AND PROPERTIES
Orders and Correspondence Must Specify Complete Number
TITLE: Diesel Engine exhaust Castings
Table 2
Mechanical Properties, Heat Treated Requirements
Property
Requirement in
Requirement in
psi, min
MPa, min
Tensile Strength
110
755
Yield strength,0.2% offset
80
550
Elongation %
15
15
Reduction of Area
35
35
Hardness BHN
240 to 280
same
Quality
General
Each part drawing shall identify the quality regions in the castings needed to determine the extent of
both surface and internal soundness inspections used for part acceptance. The quality zones used
here are as similar to the grades identified in AMS 2175, Castings, Classification and Inspection of.
Here as follows are the grades utilized by GETS:
x Grade B- limited regions within the casting where secondary welding operations require very
tight surface and internal soundness.
x Grade C- regions within a casting where stresses require moderately good overall surface and
internal soundness
x Grade D- regions of lower stress that are more easily produced, and primarily non-critical
locations within the casting. In the case of part drawing w/o identification of critical regions
then this is the default quality grade.
Each Casting shall be inspected with an inspection sequence per AMS2175
Definition of Foundry terms per AMS 2175
Repair by Welding
In accordance with ASTM A743 requirements and the following:
x Welders shall be qualified Using ASTM A488 or equivalent
x Each casting weld repaired shall be re-tempered after welding
Date of Issue Written By
Jan15,2012
AW Giammarise
Appro
d
Mgr. M & P Lab
A. W. Giammarise
Page 3 of 5
GENERAL ELECTRIC
New Issue
C50E74
Revision S-1
TRANSPORTATION SYSTEMS BUSINESS DIVISION
SPECIFICATION AND PROPERTIES
Orders and Correspondence Must Specify Complete Number
TITLE: Diesel Engine exhaust Castings
Required Inspections:
Visual Inspections:
Location and Frequency: Each Casting shall be 100% visually inspected.
Visual Acceptance:
x The casting shall be free of foreign material, and shall not contain cracks, hot tears,
cold shuts, and negative core seams.
Surface roughness;
x Shall be in conformance with the part drawing
Any additional surface features such as pits, positive metal, parting line defects
x Shall be per ASTM A997 level ll
Radiography
Locations: as identified in a CCP and the part drawing.
Frequency:
x During NCI and prior to final NCI acceptance per Table 2 Sampling, Radiographic
Inspection of Class 3 Castings, AMS 2175
x After NCI Acceptance radiography is not required unless either process changes
initiated by CCP or required by decay of overall quality indications.
Method: ASTM E1742 per AMS 2175
Radiography Acceptance:
ASTM E192 in conjunction with Table 8 AMS 2175; “Table 8- Maximum Permissible
Radiographic Severity Levels for Discontinuities in Investment Steel Castings 1 inch (25.4mm)
Wall or less per ASTM E192”
x Regions marked as Critical shall be Grade C Table 8, all discontinuity types
x Regions marked as Critical with subsequent welding in this region shall be Grade B
Table 8, all discontinuity types
x Regions not marked, or the remainder of the casting shall be Grade D Table 8, all
discontinuity types
Date of Issue Written By
Jan15,2012
AW Giammarise
Appro
d
Mgr. M & P Lab
A. W. Giammarise
Page 4 of 5
GENERAL ELECTRIC
New Issue
C50E74
Revision S-1
TRANSPORTATION SYSTEMS BUSINESS DIVISION
SPECIFICATION AND PROPERTIES
Orders and Correspondence Must Specify Complete Number
TITLE: Diesel Engine exhaust Castings
Pressure or leak testing
x Method, and acceptance per Drawing Requirements
x Frequency
o Each Casting per Drawing requirements
Certification
The casting supplier shall provide written certification that parts produced were sampled,
tested and inspected in accordance with this specification.
Test Reports shall include
x Chemical composition,
x Mechanical properties,
x Statements of conformance to requirements of visual, and any radiography carried
out.
Revision Number
S-1
Date
Summary of Changes
Issued by
Part specification for Tier 4 exhaust components
T. Giammarise
Date of Issue Written By
Jan15,2012
AW Giammarise
Appro
d
Mgr. M & P Lab
A. W. Giammarise
Page 5 of 5