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ASTM A681 (A-2)
DIN 1.2363
SAE J437 (A2)
SAE J438 (A2)
UNS T30102
Chemistry Data
Carbon
0.95 - 1.05
Chromium
4.75 - 5.5
Iron
Balance
Manganese
1 max
Molybdenum
0.9 - 1.4
Phosphorus
0.03 max
Silicon
0.5 max
Sulphur
0.03 max
Vanadium
0.15 - 0.5
General Information
Principal Design Features
This alloy is one of the Cold Work, Medium Air Hardening type tool steels. It contains chromium and molybdenum with a relatively high (1%) carbon content and is capable of deep hardening from air quench so as to minimize distortion.
Applications
Used of die shapes, slitters and similar applications where wear resistance is important.
Machinability
Machinability is medium, about 85% that of the W group of tool steels which are rated at 100% for a baseline.
Forming
Forming is done by hot forging or machining.
Welding
This is an alloy steel and thus capable of being welded. Consult the alloy supplier for welding procedures.
Heat Treatment
Heat slowly to 1450 F and then increase temperature to 1750 F. Hold at 1750 F for 30 to 45 minutes then remove from furnace and air cool (air quench).
Forging
Forging temperature range is 2000 F to 1675 F. Do not forge below 1650 F.
Hot Working
No data in regard to hot working, other than forging. Contact the alloy supplier for information.
Cold Working
Cold working is done with the alloy in the annealed condition.
Annealing
Anneal at 1575 F and slow cool in the furnace at a rate of 40 F per hour or less.
Aging
Not applicable to this alloy.
Tempering
A2 is tempered after heat treating at temperatures ranging from 350 F for Rockwell C 62 to 1000 F for Rockwell C 56.
Hardening
See "Heat Treatment" and "Tempering".
Physical Data
Density (lb / cu. in.)
0.283
Specific Gravity
7.82
Melting Point (Deg F)
2595
Modulus of Elasticity Tension
28
Mechanical Data
MSO currently has no data available for this grade.
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