H21
Description
H21 Steel is a hot work tool steel for oil or air solidifying to grow high hot quality, maintenance of hardness, and warmth checking resistance. This is mostly utilized as hot work devices, instruments for manufacture of hollows, screws, rivets, nuts and bolts. Die casting tools, forming dies, die inserts, hot shear blades.
Chemical Composition
| C | Si | Mn | Cr | V | W |
|---|---|---|---|---|---|
| 0.31 | 0.3 | 0.29 | 2.8 | 0.5 | 8.5 |
Standards
| H21 | 1.2581 | 32CDV12-28 |
Properties
| Coefficient of thermal expansionat °C | 20-100 | 20-200 | 20-300 | 20-400 | 20-500 | 20-600 | 20-700 |
|---|---|---|---|---|---|---|---|
| 10-6 m/(m*K) | 11.2 | 11.9 | 12.2 | 12.5 | 12.8 | 13 | 13.2 |
| Thermal Conductivity at °C | 100 | 400 | 675 |
|---|---|---|---|
| W/(m*K) | 27 | 29.8 | 29.1 |
Applications
- Pressure Die Casting Tools
- Extrusion
- Forming of parts
- Container for Metal Tube
- Copper Extrusion
| Soft annealing °C | Cooling | Hardness HB |
|---|---|---|
| 780 – 810 | Slowly | max. 240 |
| Hardening °C | Quenching | Hardness after quenching HRC |
|---|---|---|
| 1000 – 1130 | Oil or hot bath, 600 – 650 °C | 53 |
| Tempering °C after Quenching | 100 | 200 | 300 | 400 | 500 | 550 | 600 | 650 | 700 |
|---|---|---|---|---|---|---|---|---|---|
| HRC | 49 | 49 | 49 | 49 | 51 | 51 | 50 | 46 | 36 |
