| Customization: | Available |
|---|---|
| After-sales Service: | Change Against Defect or Technical |
| Warranty: | 1 Year |
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| Steel grade | Chemical composition(%) | ||||
| Steel name | C max | Si max | Mn | P max | S max |
| St 35 | 0.17 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St 45 | 0.21 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| St 52 | 0.22 | 0.55 | ≤1.60 | 0.025 | 0.025 |
| Steel grade | Chemical composition(%) | ||||||
| Steel name | Steel number | C max | Si max | Mn | P max | S max | Al min |
| E215 | 1.0212 | 0.10 | 0.05 | 0.70 | 0.025 | 0.025 | 0.025 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.025 | - |
| E355 | 1.0580 | 0.22 | 0.55 | 1.60 | 0.025 | 0.025 | - |
| Designation | Symbol | Description | |
| EN10305 | DIN2391 | ||
| Cold finished (hard) | +C | BK | Tubes do not undergo heat treatment following the final cold forming and thus, have a rather high resistance to deformation. |
| Cold finished (soft) | +LC | BKW | The final heat treatment is followed by cold drawing involving limited deformation. Appropriate further processing allows a certain degree of cold forming (e.g. bending, expanding). |
| Cold finished and stress-relieved | +SR | BKS | Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree. |
| Annealed | +A | GBK | The last cold forming process is followed by annealing in a controlled atmosphere. |
| Normalized | +N | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
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