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AISI O1
Category Steel
Class Tool steel
Type Oil-hardening cold work steel
Designations  Germany: DIN 1.2510
United Kingdom: B.S. BO 1
United States: ASTM A681 , FED QQ-T-570 , SAE J437 , SAE J438 , UNS T31501

Composition
ElementWeight %
C  0.85-1.00 
Mn  1.00-1.40 
Si  0.50 
Cr  0.40-0.60 
Ni  0.30 
W  0.40-0.60 
V  0.30 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.85 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