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AISI M1
Category Steel
Class Tool steel
Type Molybdenum high speed steel
Designations  France: AFNOR 08-04-02-01
Germany: DIN 1.3346
Italy: UNI X 82 MoW 09 KU
United Kingdom: B.S. BM 1
United States: FED QQ-T-590 , SAE J437 , UNS T11301

Composition
ElementWeight %
C  0.78-0.88 
Mn  0.15-0.40 
Si  0.20-0.50 
Cr  3.50-4.00 
Ni  0.3 
Mo  8.20-9.20 
W  1.40-2.10 
V  1.00-1.35 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.89 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) 10.6  20-260 more  
Glossary