Seamless Steel Pipe for Ship-building
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Application：
Seamless steel pipes are mainly applied for Level 1& Level 2 pressure pipe in piping system, boiler and super-heated unit of shipbuilding.
Main Grade of Production：320, 360, 410, 460, 490, etc.
Pipe for Ship-building（GB5213-85）: We supply carbon steel seamless pipe which is used for Level 1& Level 2 pressure pipe in piping system, boiler and super-heated unit of shipbuilding. The working temperature of the pipe wall to the seamless pipe can not over 450℃, but the working temperature of the pipe wall to alloy steel seamless pipe can over 450℃.
Pipe for Ship-building (GB5312-1999): Carbon Steel and Carbon-manganese Steel Seamless Pipes for Ship-building is mainly is used for Level 1& Level 2 pressure pipe in piping system, boiler and super-heated unit of shipbuilding etc. The standard materials are Grade 360,410,460 etc.
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Standard：With Classification Society Quality Authentication from LR, ABS, NK, GL, DNV, BV, KR, RINA, CCS
Computational formula of pipe weight: [(external diameter - wall thickness)* wall thickness]*0.02466=kg/meter (weight per meter)
Dimensional Tolerance:
| Type | External Diameter(D) | Wall Thickness(S) | ||
|---|---|---|---|---|
| Drawn Tube | External Diameter (mm) | Allowable Tolerance (mm) | Wall Thickness (mm) | Allowable Tolerance (mm) |
| ＞30～50 | ±0.3 | ≤30 | ±10％ | |
| ＞50～219 | ±0.8％ | |||
| Hot Rolling Pipe | ＞219 | ±1.0％ | ＞20 | ±10％ |
Mechanical Property :
| Standard | Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation ( ％) |
|---|---|---|---|---|
| GB/T5312 | 320 | 320～410 | ≥195 | ≥25 |
| 360 | 360～480 | ≥215 | ≥24 | |
| 410 | 410～530 | ≥235 | ≥22 | |
| 460 | 460～580 | ≥265 | ≥21 | |
| 490 | 490～610 | ≥285 | ≥21 |
Chemical Composition:
| Standard | Grade | Chemical Composition (%) | ||||
|---|---|---|---|---|---|---|
| C | Si | Mn | P | S | ||
| GB/T5312 | 320 | ≤0.16 | ≤0.35 | 0.40～0.70 | ≤0.035 | ≤0.035 |
| 360 | ≤0.17 | ≤0.35 | 0.40～0.80 | ≤0.035 | ≤0.035 | |
| 410 | ≤0.21 | ≤0.35 | 0.40～1.20 | ≤0.035 | ≤0.035 | |
| 460 | ≤0.22 | ≤0.35 | 0.80～1.40 | ≤0.035 | ≤0.030 | |
| 490 | ≤0.23 | ≤0.35 | 0.80～1.50 | ≤0.035 | ≤0.030 | |
Note：Residual element Cr≤0.25％，Mo≤0.10％，Ni≤0.30％，Cu≤0.30％gross≤0.70％
