
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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