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AISI A4
Category Steel
Class Tool steel
Type Air-hardening medium-alloy cold work steel
Designations  United States: ASTM A681 , FED QQ-T-570 , UNS T30104

Composition
ElementWeight %
C  0.95-1.05 
Mn  1.80-2.20 
Si  0.50 
Cr  0.90-2.20 
Ni  0.30 
Mo  0.90-1.40 
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