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AISI T1
Category Steel
Class Tool steel
Type Tungsten high speed steel
Designations  France: AFNOR 18-04-01
Germany: DIN 1.3355
Italy: UNI X 75 W 18 KU
Japan: JIS SKH2
United Kingdom: B.S. BT 1
United States: AMS 5626 , ASTM A600 , FED QQ-T-590 , SAE J437 , SAE J438

Composition
ElementWeight %
C  0.65-0.80 
Mn  0.10-0.40 
Si  0.20-0.40 
Cr  3.75-4.00 
Ni  0.3 
W  17.25-18.75 
V  0.90-1.30 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 8.67 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) 9.7  20-200 more  
Thermal Conductivity (W/m-K) 19.9  100 more  
Glossary