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High Speed Steel
Hot Work Tool Steel
 
 
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
 
Element  Weight % 
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  


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