Steel CR7V-L
CR7V-L steel:
strength, wear resistance and thermal shock resistance.
What?
Steel CR7V-l: high Cr alloyed special steel with Mo and V additives is characterised, with good high-temperature strength, by particularly high wear resistance, both for cold and hot work. Thermal shock resistance is good.
Material properties
- High-temperature strength .
- Wear resistance.
- Thermal shock resistance.
Application
For cold work:
- Punches and shear blade for sheet metal thickness of approx. 6-12 mm.
For hot work:
- Die inserts and mandrels.
- Extrusion dies for steel forming.
- Hot extrusion of copper and copper alloys.
- Hot shear blades and deburring tools.
- Drawing rollers for steel bottle manufacturing.
Physical properties of CR7V-L
| Temperature in °C | 20-100 | 20-200 | 20-400 | 20-600 |
|---|---|---|---|---|
| Thermal expansion in 10-6m/m x K | 11.4 | 11.9 | 12.5 | 13.1 |
| Temperature in °C | 20 | 200 | 400 | |
| Thermal conductivity in W/m x K | 26.7 | 29.8 | 30.8 | |
| Temperature in °C | 20 | |||
| Density in g/cm3 | 7.6 |
Heat treatment
| Soft annealing | Temperature: 820 – 840 °C, 4 – 6 hrs. |
|---|---|
| Cooling: slow furnace cooling | |
| Hardness: max. 240 HB | |
| Hardening | Temperature: 1030 – 1040 °C |
| Cooling: in warm bath of approx. 540 °C, in air or oil/polymer; Interrupt oil or polymer cooling at 250 – 300 °C or vacuum hardening. | |
| Tempering | Temperature: 500 – 700 °C |
| Hardness: see tempering graph | |
| Niriding | Possible |
| Preheat before use | Temperature: 150 – 350 °C |
Graphs and datasheets
Continuous time-temperature-transformation
Tempering
High-temperature strength
