| AISI T4 | |
 | |
| 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 | |
| |
