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High Speed Steel
Hot Work Tool Steel
 
 
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
 
Element  Weight % 
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


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