Seamless Steel Pipe for Ship-building

 

Standard：

With Classification Society Quality Authentication from LR, ABS, NK, GL, DNV, BV, KR, RINA, CCS

Application：

Mainly used 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.

Computational formula of pipe weight: [(external diameter - wall thickness)* wall thickness]*0.02466=kg/meter (weight per meter)

 

Types	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％

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

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％