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AISI H21 |
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| 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
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| Composition |
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| 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 |
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| Mechanical Properties |
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| Properties | Conditions |
| T (°C) | Treatment |
| Density (×1000 kg/m3) |
8.28 |
25 |
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| Poisson's Ratio |
0.27-0.30 |
25 |
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| Elastic Modulus (GPa) |
190-210
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25 |
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| Thermal Properties |
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| Properties | Conditions |
| T (°C) | Treatment |
| Thermal Expansion (10-6/ºC) |
12.4 |
20-100 more |
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| Thermal Conductivity (W/m-K) |
27 |
100 more |
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