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AISI M42
Category Steel
Class Tool steel
Type Molybdenum high speed steel
Designations  France: AFNOR 07-05-04-04-02
Germany: DIN 1.3246
United States: ASTM A600 , FED QQ-T-590 , UNS T11342

Composition
ElementWeight %
C  1.05-1.15 
Mn  0.15-0.40 
Si  0.15-0.65 
Cr  3.50-4.25 
Ni  0.3 
Mo  9.00-10.00 
W  1.15-1.85 
V  0.95-1.35 
Co  7.75-8.75 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.98 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Glossary