Bright steel
Bright steel is characterized by the fact that it offers a level, smooth surface and better machinability through descaling and non-cutting cold forming or through machining. Two processes are used to manufacture bright steel:
- Drawing - non-cutting cold forming - of previously descaled, hot-rolled raw material. The bright steel is produced without cutting by drawing on draw benches, straightened after drawing, and also wound into rings in thinner dimensions. After drawing, the bright steel can also be heat treated, followed by straightening or straightening polishing and, if necessary, grinding.
- Peeling - a cutting shaping - with subsequent straightening polishing and, if necessary, grinding.
Bright steel has a much greater dimensional accuracy than hot-formed steel , there are fewer pores and cracks and it is well suited for subsequent surface refinement. So-called free - cutting steel is almost exclusively supplied in a bright finish. The classification of bright steel is based on DIN EN 10079.
| shape | process | usual dimensions [mm] |
|---|---|---|
| round | Pull | Ø 5 - 100 |
| round | Peel | Ø 15 - 200 |
| flat | Pull | b = 5 - 500, d = 3 - 100 |
| square | Pull | 5 - 150 |
| hexagon | Pull | 5 - 120 |
Bright steel can be made from all types of steel.
| Material group | Norms |
|---|---|
| Steels for general techn. use | EN 10025, EN 10083-2 |
| Free cutting steels | EN 10087 |
| Case hardening steels | EN 10084 |
| Quenched and tempered steels | EN 10083-1 |
| Stainless steels | EN 10088-3 |
| Tool steels | DIN EN ISO 4957 |
| Rolling bearing steels | EN ISO 683-17 |
| Nitriding steels | DIN EN 10085 |
| Cold heading steels | DIN EN 10263 |
| Valve steels | EN 10090 |
swell
- Steel Information Center, Leaflet 403 - Bright steel, 1st edition 2002