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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
ElementWeight %
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 more  
Thermal Conductivity (W/m-K) 27  100 more  
Glossary
Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Salary Expectation

8 things to know about the interview question "What's your salary expectation"?