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AISI T4
Category Steel
Class Tool steel
Type Tungsten high speed steel
Designations  France: AFNOR 18-05-04-01
Germany: DIN 1.3255
Italy: UNI KU
Japan: JIS SKH3
United Kingdom: B.S. BT4
United States: ASTM A600 , FED QQ-T-590 , SAE J437 , SAE J438 , UNS T12004

Composition
ElementWeight %
C  0.70-0.80 
Mn  0.10-0.40 
Si  0.20-0.40 
Cr  3.75-4.50 
Ni  0.3 
Mo  0.40-1.00 
W  17.50-19.00 
V  0.80-1.20 
Co  4.25-5.75 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 8.68 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) 11.9  20-540  
Glossary