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AISI A3
Category Steel
Class Tool steel
Type Air-hardening medium-alloy cold work steel
Designations  United States: ASTM A681 , FED QQ-T-570 , UNS T30103

Composition
ElementWeight %
C  1.20-1.30 
Mn  0.40-0.60 
Si  0.50 
Cr  4.75-5.50 
Ni  0.30 
Mo  0.90-1.40 
V  0.80-1.40 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.7-8.03 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Glossary