BNK EN10305 Cold Drawn Seamless Precision Steel Tube
Product Details
Cold Drawn Seamless Precision Steel Tube
,EN10305 Seamless Precision Steel Tube
,EN10305 Cold Drawn Steel Tube
BNK EN10305 Cold Drawn Seamless Precision Steel Tube For Hydraulic Steel Tube
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Hydraulic steel tube
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Standard
| Material | Delivery | Surface | Sizes | |
| DIN | 2391/1630/2445 | ST37.4 ST52.4 | NBK | 1) BA 2)Black phosphating 3) Galvanizing | OD 2 -60mm * WT0.3 -10mm |
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EN
| 10305-4 | E235 E355 | (+)N | ||
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BS
| 3602 | CFS 360 | Zinc Layer thickness more than 8um | ||
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Other steel grades also available upon request
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Delivery condition:
The tubes can be produced in the following delivery conditions:
BK (+C) Cold finished/hard (cold finished as drawn).
No heat treatment after the last cold forming process.
BKW (+LC) Cold finished/soft (lightly cold worked)
After the last heat treatment there is a light finishing pass (cold drawing)
BKS (+SR) Cold finished/stress relieve annealed.
After the final cold forming process the tubes are stress relieve annealed.
GBK (+A) Annealed.
After the final cold forming process the tubes are annealed in a controlled atmosphere.
NBK (+N) Normalized. (Mainly focus on)
After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere
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Steel Grade
| Yield Strength | Tensile Strength | Elongation | |
| Name | Number | Min Mpa | Min Mpa | % |
| E215 | 1.0212 | 215 | 290-430 | 30 |
| E235 | 1.0308 | 235 | 340-480 | 25 |
| E355 | 1.0580 | 355 | 490-630 | 22 |
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OD
| Allowed Tolerance | Special Tolerance | ||
| GB/T3639 | DIN2391 | OD | WT | |
| 4mm-20mm | ±0.1mm | ±0.08mm | ±0.05mm | ±0.05mm |
| 20mm-30mm | ±0.1mm | ±0.08mm | ±0.08mm | ±0.08mm |
| 31mm-40mm | ±0.15mm | ±0.15mm | ±0.10mm | ±0.08mm |
| 41mm-60mm | ±0.2mm | ±0.20mm | ±0.15mm | ±0.15mm |
| 61mm-80mm | ±0.3mm | ±0.30mm | ±0.20mm | ±0.20mm |
| 81mm-120mm | ±0.45mm | ±0.45mm | ±0.30mm | ±0.30mm |
Main Features:
White galvanized, color galvanized (yellow galvanized),olive green.
After galvanization, the outer wall of tube has good brightness, good property for antirust and anticorrosion.
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