SOURCE CONTROL SPECIFICATION FOR MODIFIED
4340 STEEL PROCUREMENT
SOURCE CONTROL SPECIFICATION FOR
MODIFIED 4340 STEEL PROCUREMENT
CONTENTS
CONTENTS .........................................................................................................................................2
FIGURE LIST ......................................................................................................................................2
TABLE LIST ........................................................................................................................................2
1. SCOPE .........................................................................................................................................4
2. SOURCE DOCUMENT .................................................................................................................4
3. REQUIREMENTS .........................................................................................................................4
3.1. Production Methods ..................................................................................................................4
3.2.
Composition of Requested Steel ...............................................................................................5
3.3.
Forging and Dimensions of Requested Modified 4340 Steel Ingots ...........................................6
3.4.
Post-Forging Processes ............................................................................................................6
3.5.
Non-Destructive Testing ............................................................................................................7
FIGURE LIST
Figure 1 Ultrasonic examination section surface. ...........................................................................7
TABLE LIST
Table 1 Chemical crucible analysis of the requested steel ingots by weight percent. .................5
Table 2 Chemical product analysis of the requested steel ingots by weight percent. ..................5
Table 3 The desired H, O and N ratios in the steel ingots. ..............................................................6
Table 4 Segregation acceptance values in accordance with ASTM A 604 .....................................6
Table 5 Inclusion contents of forged steels. ....................................................................................7
SOURCE CONTROL SPECIFICATION FOR
MODIFIED 4340 STEEL PROCUREMENT
SOURCE CONTROL SPECIFICATION FOR
MODIFIED 4340 STEEL PROCUREMENT
1. SCOPE
The physical and chemical properties, non-destructive testing and other relevant issues of modified
4340 steel material required to be produced are given in this document.
2. SOURCE DOCUMENT
AMS 2259 Chemical Check Analysis Limits Wrought Low-Alloy and Carbon Steels
ASTM A255 Test Method of End-Quench Test for Hardenability of Steel
ASTM E350 Standard Test Methods for Chemical Analysis of Carbon Steel, Low-Alloy Steel, Silicon
Electrical Steel, Ingot Iron, and Wrought Iron
ASTM A604 Standard Practice for Macroetch Testing of Consumable Electrode Remelted Steel Bars
an Billets
ASTM A751 Standart Test Methods, Pratices and Terminology for Chemical Analysis of Steel Products
ASTM A788/A 788M Standard Specification for Steel Forgings, General Requirements
ASTM E45 Standard Test Methods for Determining the Inclusion Content of Steel
ASTM E1019 Standard Test Methods for Determination of Carbon, Sulfur, Nitrogen, and Oxygen in
Steel and in Iron, Nickel, and Cobalt Alloys
ASTM E1077 Standard Test Methods for Estimating the Depth of Decarburization of Steel Specimens
EN 13261 Railway applications. Wheelsets and Bogies. Axles. Product requirements
EN 10222-1 Steel Forgings for Pressure purposes Part: General requirements for open die forging
EN 10228-3 Non-destructive Testing of Steel Forgings – Part – 3: Ultrasonic Testing of Ferritic or
Martensitic Steel Forgings
DIN 7527 Steel Forgings; Machining Allowances and Permissible Variations for Open-die Forged Discs
ISO 14284 Sampling and preparation of samples for the determination of chemical composition
3. REQUIREMENTS
3.1.
Production Methods
The physical and chemical properties, non-destructive testing methods and other relevant issues of
modified 4340 steel material required to be produced are given below.
1. The production method of electric arc furnace, ladle furnace, vacuum degassing and electro
slag re-melting methods shall be used respectively in the manufacturing of steel ingots.
2. Steel billets will be fully killed by the addition of Aluminum.
3. The tonnages and dimensions of the crucibles to be cast will be determined by the manufacturer,
taking into account the requested ingot sizes with a minimum forging ratio of 3.
SOURCE CONTROL SPECIFICATION FOR
MODIFIED 4340 STEEL PROCUREMENT
3.2.
Composition of Requested Steel
The cast analysis of the requested steel ingots is given in Table 1.
Table 1 Chemical Cast analysis of the requested steel ingots by weight percent.
ELEMENT
wt.%
Value/ Interval*
C
0.34-0.38
Mn
0.20-0.30
Si
0.20-0.30
Cr
1.10-1.20
Ni
2.20-2.40
Mo
0.40-0.50
V
0.05-0.1
P
0.015 (max.)
Cu
0.15 (max)
S
0.005 (max.)
Al
0.01 (max.)
Sb
0.003 (max.)
Sn
0.007 (max.)
As
0.007 (max.)
Zr
0.02 (max.)
* Allowable deviations in values must comply with the AMS-2259 standard.
The desired product analysis values of the requested ingots are given in Table 2.
Table 2 Chemical product analysis of the requested steel ingots by weight percent.
ELEMENT
wt. %
Value
C
~0.38
Mn
0.25
Si
0.25
Cr
1.15
Ni
2.30
Mo
0.45
V
0.1
SOURCE CONTROL SPECIFICATION FOR
MODIFIED 4340 STEEL PROCUREMENT
The desired hydrogen (H), oxygen (O) and nitrogen (N) ratios in the steel ingots are given in Table 3.
Table 3 The desired H, O and N ratios in the steel ingots.
wt. %
ELEMENT
3.3.
Value
H
Max. 1 ppm
O
Max. 15 ppm
N
Max. 80 ppm
Forging and Dimensions of Requested Modified 4340 Steel Ingots
The tonnages of the crucibles to be cast will be determined by the manufacturer, taking into account
the requested ingot sizes with a minimum forging ratio of 3.
Dimensions and amount of requested steel ingots after forging and peeling process are given below.

3.4.
Ø 200 ± 5 mm x 1600 ± 5 mm x 150 pieces
Post-Forging Processes
The analysis processes requested after forging process are given below:
1. The desired Brinell hardness values from the steel billets will be equal to or lower than 285 HB
after the annealing process.
2. Segregation analysis will be conducted on the steel billets according to ASTM A604 after forging
process. The desired values after analysis are given Table 4.
Table 4 Segregation acceptance values in accordance with ASTM A 604
Macrograph Values
Classes
Severity
Class 1
A
Class 2
A
Class 3
A
Class 4
A
3. Ca-Si modification will be conducted during production process and residual inclusions shall be
in spherical geometry.
4. The desired inclusion contents of forged steels will be as in Table 5 according to the ASTM E45
standard.
SOURCE CONTROL SPECIFICATION FOR
MODIFIED 4340 STEEL PROCUREMENT
Table 5 Inclusion contents of forged steels.
A
B
C
D
Thin
Heavy
Thin
Heavy
Thin
Heavy
Thin
Heavy
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
2
1.5
1
1
0.5
0.5
1
0.5
5. Hardenability testing of forged steels will be conducted in accordance with ASTM A255 standard
and will be min. 52 HRC at J12/16 in., J20/16 in. and J32/16 in. The austenitizing temperature
to be used the Jominy End Quench Test will be 840 ± 5 °C.
3.5.
Non-Destructive Testing
All of the forged steel pieces will be ultrasonically inspected in accordance with EN-10228-3 standard
to detect internal defects. Steel billets that forged to Ø 200 ± 5 mm shall be scanned at an angle of 180°
and evaluated according to the Class 4 of EN 10228-3 standard.
Figure 1 Ultrasonic examination section surface