Seamless Precision Cold Drawn / Cold Rolled Steel Pipe
DIN2391/EN10305-1/Astm A519 Preicision Seamless Steel Tube
Material: st35, st45, st52, E235, E255, E355, 1010, 1020, 1026, 1045, 4130, 4140
Size Range: OD: 6-1688mm, WT: 1-30mm, Length: 5.8m/6m, maximal 11.8m
Delivery Condition: BK, BKW, BKS, GBK, NBK
Application: For high precision purpose, auto industry, like manipulator, Shock Absorber, Transmission Shaft, Steering Gear, Car Frame, etc.
Delivery Conditions
The tubes shall be manufactured from cold drawn or cold rolled processes. The tubes shall be supplied in one of the delivery conditions as follows:
| 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 treatment 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 stress-relieved | BKS | Heat treatment is applied following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and 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. |
Quality Control:
1. Incoming Raw Material Inspection
2. Raw Material Segregation to avoid steel grade mix-up
3. Heating and Hammering End for Cold Drawing
4. Cold Drawing or Cold Rolling, On line inspection
5. Heat Treatment:+SR, +A, +N
6. Straightening/Cutting to specified length/Finished Measuring Inspection
7. Quality Testing in own lab with Tensile Strength, Yield Strength, Elongation, Hardness, Straightness, etc.
8. Packing and Stocking.
| Product Name | DIN2391 st35 NBK Seamless Precision Steel tubes |
| Material | St35 |
| Delivery Condition | BK, BKW, BKS, GBK, NBK |
| Standard | EN10305-1 / DIN2391 / EN10305-4 |
| Size Range | OD: 6-88mm, WT: 1-15mm |
| Application | High precision purpose, auto parts, oil cylinder, etc |
| Round Billet | Bao Steel, Xingcheng Steel, Zhongtian Steel |
| Keyword | Seamless Steel Tube |
| Certificate | TS16949, ISO 9001 |
| HS code | 7304319000 |
| Delivery Time | 45 days |
| Pakcing | Bundles or Woodern Boxes |
| Steel Grade | Chemical Composition |
| Symbol | Material Number | C Max. | Si Max. | Mn | P Max. | S Max. |
| ST35 | 1.0308 | 0.17 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| ST45 | 1.0408 | 0.21 | 0.35 | ≥0.40 | 0.025 | 0.025 |
| ST52 | 1.0580 | 0.22 | 0.55 | ≤1.60 | 0.025 | 0.025 |
| Steel Grade | BK | BKW | BKS |
| Name | No. | Rm Mpa | A % | Rm Mpa | A % | Rm Mpa | ReH Mpa | A % |
| ST35 | 1.0308 | 480 | 6 | 420 | 10 | 420 | 315 | 14 |
| ST45 | 1.0408 | 580 | 5 | 520 | 8 | 520 | 375 | 12 |
| ST52 | 1.0580 | 640 | 4 | 580 | 7 | 580 | 450 | 10 |
| Steel Grade | GBK | NBK |
| Name | No. | Rm Mpa | A % | Rm Mpa | ReH Mpa | A % |
| ST35 | 1.0308 | 315 | 25 | 340--470 | 235 | 25 |
| ST45 | 1.0408 | 390 | 21 | 440--570 | 255 | 21 |
| ST52 | 1.0580 | 450 | 22 | 490--630 | 355 | 22 |
Tags: Precision Steel Tube, Seamless steel tube, cold drawn steel tube, DIN2391, EN10305-1, ASTM A519, Steel Pipe, High Precision steel pipe
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