Steel 1.2779 - HWF
1.2779 - HWF steel:
austenitic age-hardenable steel
What?
1.2779 – HWF steel is an austenitic age-hardenable steel with best high-temperature strength properties. Preferred areas of use are forming work with thermal load if the temper resistance of the martensitic steels is not enough.
Material properties
Properties of steel type 1.2779 – HWF
- Hardenable.
- Best high-temperature .
Application
The most common applications for steel type 1.2779 – HWF
- Extrusion press tools for copper and copper alloys such as inner liners, dies, spider tools.
- Hot shear blades in rolling lines.
Delivery condition
Solution annealed or solution annealed and aged with following values:
0.2% yield strength Rp0,2 mind.: 650 MPa
Tensile strength Rm: 950 – 1150 MPa
Physical properties of 1.2779 - HWF steel
| Temperature in °C | 20-100 | 20-200 | 20-400 | 20-600 |
|---|---|---|---|---|
| Thermal expansion in 10-6m/m x K | 16.5 | 16.8 | 17.2 | 17.6 |
| Temperature in °C | 20 | 200 | 400 | |
| Thermal conductivity in W/m x K | 13.0 | 16.4 | 20.3 | |
| Temperature in °C | 20 | |||
| Density in g/cm3 | 7.95 | |||
| Temperature in °C | 20 | |||
| E module in GPa | 208 |
Heat treatment
| Soft annealing | Temperature: 970 – 990 °C, 1 hrs |
|---|---|
| Cooling: air | |
| Hardness: 850 MPa | |
| Tempering | Temperature: 710 – 730 °C, 16 hrs |
| Hardness: see tempering curve | |
| Nitriding | Possible |
