The series of carbon steels for surface tempering includes four types of materials with an increasing carbon content. The hardness that can be obtained on a surface hardened with this treatment is directly proportional to the steel’s carbon content. All of these steels have a balanced chemical composition that allows a good machinability (S = 0.020 – 0.040) and an excellent repeatability of the heat treatment thanks to the constant size of the austenitic grain (Al = 0.020 – 0.050). The required hardness values can only be obtained with certainty after the removal of the bar’s surface layer to eliminate any decarburization. The heat treatments available for this type of steel – to be checked on a case-by-case basis according to the different qualities – are: rolled natural, workable annealed, isothermal annealed, globular annealed, normalized, and quenched and tempered.
| Form | Execution | Section | Dia. | Finish | Tolerances |
|---|---|---|---|---|---|
| Bar | Hot-Rolled | Round | 20-200 mm | Raw, peeled iron product | - |
| Bar | Cold-Drawn |
Round
Hexagonal Square |
3-70 mm
3-70 mm 4-60 mm |
Polished | EN 10278 h9 h10 h11 |
| Bar | Peeled - Rolled | Round | 20-100 mm | Polished | EN 10278 h9 h10 h11 |
| Bar | Ground | Round | 50-60 mm | Polished | EN 10278 h7 h8 h9 h10 h11 |
| Wire | Cold-Drawn |
Round
Hexagonal Square |
2-22 mm
3-12 mm 4-12 mm |
Polished, phosphated | EN 10278 h9 h10 h11 |
