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High Speed Steel
Hot Work Tool Steel
 
 
AISI H21

Category  Steel
Class  Tool steel
Type  Tungsten hot work steel
Designations  France: AFNOR Z 30 WCV 9
Germany: DIN 1.2581
Italy: UNI X 28 W O9 KU
Japan: JIS SKD5
United Kingdom: B.S. BH 21
United States: ASTM A681 , FED QQ-T-570 , SAE J437 , SAE J438 , UNS T20821

Composition
 
Element  Weight % 
C  0.26-036 
Mn  0.15-0.40 
Si  0.15-0.50 
Cr  3.00-3.75 
Ni  0.3 
W  8.50-10.00 
V  0.30-0.60 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
 
Properties  Conditions 
T (°C) Treatment
Density (×1000 kg/m3)   8.28 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  20-100 
Thermal Conductivity (W/m-K)   27  100 

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