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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
STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.