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AISI M41
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 T11341

Composition
ElementWeight %
C  1.05-1.15 
Mn  0.20-0.60 
Si  0.15-0.50 
Cr  3.75-4.50 
Ni  0.3 
Mo  3.25-4.25 
W  6.25-7.00 
V  1.75-2.25 
Co  4.75-5.75 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 8.17 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 9.7  20-200 more  
Glossary