TORICH INTERNATIONAL LIMITED
TORICH INTERNATIONAL LIMITED The Steel Tube Maker
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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.
