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Cold Drawn Carbon Steel Seamless Tubing DIN2391 St37.4 NBK status
Precision Seamless Steel Tube: Norm DIN2391 EN10305, High quality carbon precision steel tubes St35 St37.4 St52, cold drawing, bright heat treatment without oxidation (NBK status), non-destructive testing, cleaning, phosphating, anti-rust oil dipping, the application for machine tools industry, construction machinery, ship building industry hydraulic system, automotive steel tube, and in the occasion where the high precision, brightness, cleanness and mechanical properties of the tube are required.
| Products Specification : |
| Production Standard :DIN 2391/DIN 1629/EN 10305/ASTM A179/JIS G3445 |
| Finished Condition : NBK(+N) / GBK(+A) / BK(+C) / BKW(+LC) / BKS(+SR) |
| Material: ST35(E235) / ST45(E255) / ST52(E355) / ST37.4 |
| Size Range and Tolerance | |||
| OD Size Range (mm) | DIN tolerance | Special tolerance | Special high precision |
| ø4~30mm | ±0.08mm | ±0.05mm | ±0.03mm |
| ø31~40mm | ±0.15mm | ±0.05mm | ±0.03mm |
| ø41~50mm | ±0.20mm | ±0.08mm | ±0.03mm |
| ø51~60mm | ±0.25mm | ±0.10mm | ±0.03mm |
| ø61~70mm | ±0.30mm | ±0.15mm | ±0.05mm |
| ø71~80mm | ±0.35mm | ±0.20mm | ±0.05mm |
| ø81~90mm | ±0.40mm | ±0.25mm | ±0.05mm |
| ø91~100mm | ±0.45mm | ±0.35mm | ±0.05mm |
| Wall Thickness Range | DIN tolerance | Standard tolerance | Special high precision |
| 0.5~15mm | ±10% | ±5~8% | ±5~7% |
| Size List : all dimensions are by metric. | |||||||
| OD×WT | OD×WT | OD×WT | OD×WT | OD×WT | OD×WT | OD×WT | OD×WT |
| Ø4×0.5 | Ø12×1.5 | Ø16×2.5 | Ø22×1.5 | Ø28×2.0 | Ø34×2.0 | Ø38×3.0 | Ø48×3.5 |
| Ø4×1.0 | Ø12×2.0 | Ø16×3.0 | Ø22×2.0 | Ø28×2.5 | Ø34×2.5 | Ø38×3.5 | Ø48×5.0 |
| Ø5×1.0 | Ø12×2.5 | Ø18×1.0 | Ø22×2.5 | Ø28×3.0 | Ø34×3.0 | Ø38×4.0 | Ø50×5.0 |
| Ø6×1.0 | Ø14×1.0 | Ø18×1.5 | Ø22×3.0 | Ø28×3.5 | Ø34×3.5 | Ø38×5.0 | Ø50×6.0 |
| Ø6×1.5 | Ø14×1.5 | Ø18×2.0 | Ø22×3.5 | Ø28×4.0 | Ø34×4.0 | Ø38×6.0 | Ø60×3.0 |
| Ø6×2.0 | Ø14×2.0 | Ø18×2.5 | Ø22×4.0 | Ø30×1.5 | Ø34×4.5 | Ø40×4.0 | Ø60×5.0 |
| Ø8×1.0 | Ø14×2.5 | Ø18×3.0 | Ø22×5.0 | Ø30×2.0 | Ø34×5.0 | Ø42×2.0 | Ø60×6.0 |
| Ø8×1.5 | Ø14×3.0 | Ø19×2.0 | Ø24×2.0 | Ø30×2.5 | Ø35×1.5 | Ø42×3.0 | Ø60×7.0 |
| Ø8×2.0 | Ø15×1.0 | Ø20×1.0 | Ø25×2.0 | Ø30×3.0 | Ø35×2.0 | Ø42×3.5 | Ø60×8.0 |
| Ø8×2.5 | Ø15×1.5 | Ø20×1.5 | Ø25×2.5 | Ø30×3.5 | Ø35×2.5 | Ø42×4.0 | Ø65×5.0 |
| Ø9×1.5 | Ø15×2.0 | Ø20×2.0 | Ø25×3.0 | Ø30×4.0 | Ø35×3.0 | Ø42×4.5 | Ø65×8.0 |
| Ø10×1.0 | Ø15×2.5 | Ø20×2.5 | Ø25×4.0 | Ø30×5.0 | Ø35×3.5 | Ø42×5.0 | Ø70×4.0 |
| Ø10×1.5 | Ø15×3.0 | Ø20×3.0 | Ø27×3.0 | Ø32×2.0 | Ø35×4.0 | Ø42×6.0 | Ø70×5.0 |
| Ø10×2.0 | Ø16×1.0 | Ø20×3.5 | Ø27×3.5 | Ø32×2.5 | Ø35×4.5 | Ø45×3.0 | Ø70×8.0 |
| Ø10×3.5 | Ø16×1.5 | Ø20×4.0 | Ø27×4.0 | Ø32×3.0 | Ø35×5.0 | Ø45×6.0 | Ø90×5.0 |
| Ø12×1.0 | Ø16×2.0 | Ø22×1.0 | Ø28×1.5 | Ø32×4.0 | Ø38×2.5 | Ø48×3.0 | Ø114×4.0 |
Features:
Carbon Steel Seamless Tubes
● DIN highly accurate, cold drawn and bright carbon steel seamless tube is used as the tube to be phosphated. The phosphated is realized with the imported chemical fluid to form a black film. The antirust oil is absorbed by means of the micropore on the film to prevent from the rust. The caps are covered at two ends of tube to prevent from the dust.
● High accuracy, excellent brightness, no oxidization on the outer and inner walls after heat treatment, high cleanness inside wall.
● The steel tube is able to stand high pressure. No deformation after cold bending, no crack after flaring and flattening. The complicated geometrical forming and machining can be realized.
● The color of NBK tube is Bright Black. Color is homogeneously distributed on the tube surface. The tube has good property of antirust.
EN 10305-1 Chemical composition(%)
| Steel grade | Steel | C(% max) | Si(% max) | Mn(% max) | P(% max) | S(% max) |
| E215 | 1.0212 | 0.10 | 0.05 | 0.70 | 0.025 | 0.015 |
| E235 | 1.0308 | 0.17 | 0.35 | 1.20 | 0.025 | 0.015 |
| E355 | 1.0580 | 0.22 | 0.55 | 1.60 | 0.025 | 0.015 |
EN 10305-1 Mechanical and technological properties
| Yield strength (min Mpa) | Tensile strength (min Mpa) | Elongation (min %) |
| 215 | 290-430 | 30 |
| 235 | 340-480 | 25 |
| 355 | 490-630 | 22 |
Condition on delivery of EN 10305-1:
| Term | Symbol | Explanation |
| Cold-finished/hard | BK | No heat treatment after the last cold-forming process. The tubes, therefore, have only low deformability. |
| Cold-finished/soft | BKW | After the last heat treatment, there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits. |
| Annealed | GBK | After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum. |
| Normalized | NBK | The tubes are annealed above the upper transformation point in a controlled atmosphere or under a vacuum. |
