Seamless Steel Pipe for Ship Building

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: Chemical compisition: Mechanocal properties： Post time: Feb-10-2023 Types of steel tubes Out diameter Out diameter Wall thickness Wall thickness Cold-rolled tubes Tube sizes (mm) Tolerances (mm) Tube sizes (mm) Tolerances (mm) Cold-rolled tubes ＞30-50 ±0.3 ≤30 ±10% Cold-rolled tubes ＞50-219 ±0.8% ≤30 ±10% Hot-rolled tubes ＞219 ±1.0% ＞20 ±10% Models of steel tubes Chemical compisition (%) Chemical compisition (%) Chemical compisition (%) Chemical compisition (%) Chemical compisition (%) Models of steel tubes 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 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