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EN10305 Cold Drawn Precision Tube
Seamless cold drawn precision tubes according to EN 10305-1 (DIN 2391), with narrow tolerances, a good surface and special mechanical properties. After the heat treatment +N (NBK) the tubes can be cold formed (bending).
Description
EN 10305 cold drawn precision tube
Specification for cold drawn precision tube
| Standard | EN 10305-1 (DIN 2391) |
| Material | E235 (ST35) / E355 (ST52) |
| Type | +C (BK) : No heat treatment after cold drawing, cold forming very restricted. +N (NBK) : Suitable for cold forming |
| Straightness deviation | Outside diameter>15 mm = 0.25% of the length Outside diameter 6-15 mm (straightened by the eye) Outside diameter < 6 mm = no guarantee for the straightness |
| Wall thickness tolerance | ±10% |
| Lengths | In random lengths, between 1 and 7 meter. Cutting on request. |
Properties for cold drawn precision tube
| Mechanical properties | E235+C (ST35 BK) | E355+C (ST52 BK) | E235+N (ST35 NBK) | E355+N (ST52 NBK) |
| Yield strength, MPa, min | 235 | 355 | 235 | 355 |
| Tensile strength, MPa | min. 480 | min. 640 | 340-480 | 490-630 |
| Elongation (A5) min, % | 6 | 4 | 25 | 22 |
| Chemical | C, max, % | Si, max, % | Mn, max, % | P, max, % | S, max, % |
| E235 | 0.17 | 0.35 | 0.40 | 0.025 | 0.025 |
| E355 | 0.22 | 0.55 | 1.20 | 0.025 | 0.025 |
Out of roundness for cold drawn precision tube
The tolerances of the tube are also the basis for the ovality.
The eccentricity is a result of the tolerances on the wall thickness.
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