Seamless steel pipe for ship building usage

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.

Classification of ships:

Standard for malerials and wielding from Chinese classifying society Chinese clasifying society(CCS)

Standard of DNV Det Norske Veritas(DNV)

Standard of Lloyd’S Register of UK(LR)　Lloyd’S Register of UK(LR)

Standard of Germanischer Lloyd Germanischer Lloyd(GL)

Standard of American Bureau of Shipping(ABS)American Bureau of Shipping(ABS)

Standard of BUREAU VERITAS(BV)BUREAU VERITAS(BV)

Standard of RINA Italian classification society(RINA)

Standard of NIPPON KAIJI KYOKAI(NK)NIPPON KAIJI KYOKAI(NK)

GB/T5312 Chinese national standard

Appication：

Seamless steel tubes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and Ⅱ．

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Model N0．of major steel tubes

320，360，410，460，490，etc．

Types of steel tubes	Outer diameters		wall thickness
Cold-rolled tubes	Rube size(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％

Mechanocal properties：

Standard code	Models of steel tubes	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

Chemical compisition:

Standard code	Models of steel tubes	Chemical compisition（％）
		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 elements:Cr≤0.25％，Mo≤0.10％，Ni≤0.30％，Cu≤0.30％aggregate≤0.70％