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Shipbuilding pipe

Usage: For manufacturing marine boiler super heater and level-Ⅰ, Ⅱ pressure seamless steel tube

Standard: GB/T 5312-1999 and it can also be supplied according to related standards of ship’s classification

Certificates: The products have been certified by CCS ( China ), DNV ( Norway ), BV (France), LR ( UK ) and GL ( Germany ).

Raw material: 320 360 410 460 490

Product range: Dia. 114 -245 mm WT 8 -20 mm

Size Tolerance

Mechanical Properties

Chemical composition

Note: Cr≤0.25％，Mo≤0.10％，Ni≤0.30％，Cu≤0.30％ Total quantity ≤0.70％

GB/T 5312-1999 (Hot rolled, Hot-expanding, extrusion)

Steel	Size		Allowed Tolerance
Hot-rolled, Hot-expanding, Extrusion Tube	OD (D)	≤159	±1.0%, Min ±1.25%
	OD (D)	>159	±1.25%
	WT (S)	≤20	±15% Min. + 0.45 mm - 10% Min. – 0.30 mm
		>20	±10%
		D≥ 351 mm hot-expanding tube	±15%

GB/T 5312-1999 (Cold-drawn)

Longitudinal Mechanical Performance
Steel	Grade	Tensile Strength (MPa)	Yield Stress (MPa)≥	Elongation （%）≥
Carbon and Carbon-Manganese Steel	360	360-480	215	24
	410	410-530	235	22
	490	490-610	285	21
1Cr0.5Mo	440	440-600	275	22
2.25Cr1Mo	410	410-560	235	20
2.25Cr1Mo	490	490-640	275	16

Chemical Composition
Steel	Grade	C	Si	Mn	P≤	S≤	Cr	Mo	Ni	Cu	Sn	W	Total
Carbon and Carbon-Manganese Steel	360	≤0.17	≤0.35	0.40-0.80	0.040	0.040	≤0.25	≤0.10	≤ 0.30	≤ 0.30	-	-	≤ 0.70
	410	≤0.21	≤0.35	0.40-1.20	0.040	0.040	≤0.25	≤0.10	≤ 0.30	≤ 0.30	-	-	≤ 0.70
	440	≤0.23	≤0.35	0.80-1.50	0.040	0.040	≤0.25	≤0.10	≤ 0.30	≤ 0.30	-	-	≤ 0.70
1Cr0.5Mo	440	0.10-0.18	0.10-0.35	0.40-0.70	0.040	0.040	0.70-1.10	0.45-0.65	≤ 0.30	≤ 0.25	≤ 0.03	≤ 0.020	-
2.25Cr1Mo	410	0.08-0.15	0.10-0.35	0.40-0.70	0.040	0.040	2.00-2.50	0.90-1.20	≤ 0.30	≤ 0.25	≤ 0.03	≤ 0.020	-