| 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 | |
| |
