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Products - Seamless precision steel tube
DIN2391
Size: OD4-220mm
WT0.5-20mm
Length12000mm Max.
 Size |
 |
| Mechanical properties |
|
Description:
1. Tubes are made by a seamless process and are cold finished.
| Chemical composition |
|
| |
St30Si |
St30Al |
St35 |
St45 |
St52 |
| Carbon |
0.10 Max. |
0.10 Max. |
0.17 Max. |
0.21 Max. |
0.22 Max. |
| Silicon |
0.30 Max. |
0.05 Max. |
0.35 Max. |
0.35 Max. |
0.55 Max. |
| Manganese |
≤0.55 |
≤0.55 |
≥0.40 |
≥0.40 |
≤1.60 |
| Phosphorus, Max. |
0.025 Max. |
0.025 Max. |
0.025 Max. |
0.025 Max. |
0.025 Max. |
| Sulfur, Max. |
0.025 Max. |
0.025 Max. |
0.025 Max. |
0.025 Max. |
0.025 Max. |
| Final supply conditions |
| Designation |
Symbol |
Description |
| Cold finished (hard) |
BK |
Tubes do not undergo heat treatment following the final cold forming and, thus, have a rather high resistance to deformation |
| Cold finished (soft) |
BKW |
The final heat treatmetn 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 |
BKS |
Heat treatment is appplied following the last cold forming process. Subject to appropriate |
| Stress-relieved |
|
processing conditions, the increase in the residual stresses involved enables both formingand machining to a certain degree. |
| Annealed |
GBK |
The last cold forming process is followed by annealing in a controlled atmosphere. |
| Normalized |
NBK |
The last cold forming process is followed by annealing above the upper transformation point |
| |
|
in a controlled atmosphere. |
|
