Seamless Steel Pipe for Ship Building

Keywords:Seamless Steel Pipe for Ship Building

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