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