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AISI M4
Category Steel
Class Tool steel
Type Molybdenum high speed steel
Designations  United States: ASTM A600 , FED QQ-T-590 , SAE J437 , SAE J438 , UNS T11304

Composition
ElementWeight %
C  1.25-1.40 
Mn  0.15-0.40 
Si  0.20-0.45 
Cr  3.75-4.75 
Ni  0.3 
Mo  4.25-5.50 
W  5.25-6.50 
V  3.75-4.50 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.97 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) 9.5  20-260 more  
Glossary