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AISI A7
Category Steel
Class Tool steel
Type Air-hardening medium-alloy cold work steel
Designations  United States: ASTM A68i , FED QQ-T-570 , UNS T30107

Composition
ElementWeight %
C  2.00-2.85 
Mn  0.80 
Si  0.50 
Cr  5.00-5.75 
Ni  0.30 
Mo  0.90-1.40 
W  0.50-1.50 
V  3.90-5.15 
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) 12.4  20-425 more  
Glossary