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The seamless steel pipe for ship building usage are mainly used for Level 1& Level 2 pressure pipe in piping system, boiler and super-heated unit of shipbuilding.
Model N0．of major steel tubes: 320，360，410，460，490，etc．
Sizes:
|
Types of steel tubes |
Out diameter | Wall thickness | ||
|
Cold-rolled tubes |
Tube sizes (mm) |
Tolerances (mm) |
Tube sizes (mm) |
Tolerances (mm) |
|
＞30-50 |
±0.3 |
≤30 |
±10% | |
|
＞50-219 |
±0.8% |
|||
|
Hot-rolled tubes |
＞219 |
±1.0% |
＞20 |
±10% |
Chemical compisition:
|
Models of steel tubes |
Chemical compisition (%) |
||||
| C | Si | Mn | P | S | |
|
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 |
Mechanocal properties：
|
Models of steel tubes |
Tensile strength (MPa) |
Yield strength (MPa) |
Elongation (%) |
| 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 |
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