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AISI O2
Category Steel
Class Tool steel
Type Oil-hardening cold work steel
Designations  France: AFNOR 90 MV 8
Germany: DIN 1.2842
Italy: UNI 88 Mn V 8 KU
United Kingdom: B.S. Bo 2
United States: ASTM A681 , FED QQ-T-570 , SAE J437 , SAE J438 , UNS T31502

Composition
ElementWeight %
C  0.85-0.95 
Mn  1.40-1.80 
Si  0.50 
Cr  0.35 
Ni  0.30 
Mo  0.30 
V  0.30 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.66 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) 11.2  20-100 more  
Glossary