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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
Tianjin Wanlei Steel Pipe Co., Ltd. is one of the leading manufacturers and suppliers of en10305 cold drawn precision tube in China, featured by quality products and low price. If you're going to wholesale durable en10305 cold drawn precision tube made in China, welcome to get pricelist and free sample from our factory.
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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