Ship building tubes

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.

Seamless steel tubes for ship-building refer to the ship building steel pipes which are designed and manufactured for boilers,super heaters and pressure systems of ship. The ship building steel pipes can be expansively used in various kinds of ships such as CCS,DNV,LR,GL,ABS,BV,RINA,NK as well as China national standards.

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 Carbon and carbon-manganese steel seamless steel tubes and pipes for ship

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％	≤30	±10％
Hot-rolled tubes	＞219	±1.0％	＞20	±10％

Mechanocal properties：

Standard	Type of steel	Grade	Tensile strength (Mpa)	Yield point(Mpa) not less than	Elongation(%) not less than
GB/T 5312	Carbon & Carbon-Manganese	320	320-440	195	25
		360	360-480	215	24
		410	410-530	235	22
		460	460-580	265	21
		490	490-610	285	21
China Classification Society (CCS)	1Cr0.5Mo	440	440-590	275	22
	2.25Cr1Mo	410	410-560	135	20
	2.25Cr1Mo	490	490-640	275	16

Chemical compisition:

Grade		Steel Grade	C	Si	Mn	S	P	Residual element
Standard		Steel Grade	C	Si	Mn	S	P	Cr	Mo	Ni	Cu	Total
GB/T 5312	Carbon & Carbon-Manganese	320	≤0.16	≤0.35	0.40-0.70	≤0.035	≤0.035	≤0.025	≤0.010	≤0.030	≤0.30	≤0.70
		360	≤0.17	≤0.35	0.40-0.80	≤0.035	≤0.035	≤0.025	≤0.010	≤0.030	≤0.30	≤0.70
		410	≤0.21	≤0.35	0.40-1.20	≤0.035	≤0.035	≤0.025	≤0.010	≤0.030	≤0.30	≤0.70
		460	≤0.22	≤0.35	0.80-1.40	≤0.035	≤0.035	≤0.025	≤0.010	≤0.030	≤0.30	≤0.70
		490	≤0.23	≤0.35	0.80-1.50	≤0.035	≤0.035	≤0.025	≤0.010	≤0.030	≤0.30	≤0.70
China Classification Society (CCS)	1Cr0.5Mo	440	0.10-0.18	0.10-0.35	0.40-0.70	≤0.035	≤0.035	0.70-1.10	0.45-0.65	≤0.030	≤0.25	Sn≤0.03 Al≤0.02
	2.25Cr1Mo	410	0.08-0.15	0.10-0.35	0.40-0.70	≤0.035	≤0.035	2.00-2.50	0.90-1.20	≤0.030	≤0.25	Sn≤0.03 Al≤0.02
	2.25Cr1Mo	490	0.08-0.15	0.10-0.35	0.40-0.70	≤0.035	≤0.035	2.00-2.50	0.90-1.20	≤0.030	≤0.25	Sn≤0.03 Al≤0.02

Other classifications of ships can also be provided after consulting with customers.

Seamless steel tube and pipe for ship building usage

Society	Standard or usage	Steel grade	chemical composition, %
Society	Standard or usage	Steel grade	C	Si	Mn	P	S	Cr	Ni	Cu	Al	Mo	V	P+S
GLR	Non alloly	GL-R 410	≤ 0.21	≤ 0.35	≤ 1.40	≤ 0.025	≤ 0.020	-	-	-	≥0.020	-	-	-
	GB 18248	37Mn	0.34 ~0.40	0.10 ~0.30	1.35 ~1.65	≤ 0.030	≤ 0.030	≤ 0.30	≤ 0.30	≤ 0.20	-	-	-	≤ 0.055
	EN 10297	34CrMo4	0.30 ~0.37	≤ 0.40	0.60 ~0.90	≤ 0.035	≤ 0.035	0.9 ~1.20	-	-	-	0.15 ~0.30	-	-
DNV	for pressure ASTM A53/A53M	A53B	≤ 0.30	-	≤ 1.20	≤ 0.050	≤ 0.045	≤ 0.40	≤ 0.40	≤ 0.40	-	≤ 0.15	≤ 0.08	-
ABS	for pressure	Grade 3	≤ 0.30	-	≤ 1.20	≤ 0.050	≤ 0.045	≤ 0.40	≤ 0.40	≤ 0.40	-	≤ 0.15	≤ 0.08	-
BV	for pressure	410HB	≤ 0.21	≤ 0.35	0.40 ~1.20	≤ 0.040	≤ 0.040	-	-	-	-	-	-	-
LR	for pressure	410	≤ 0.21	≤ 0.35	0.40 ~1.20	≤ 0.045	≤ 0.045	≤ 0.25	≤ 0.30	≤ 0.30	-	≤ 0.10	-	-
KR	for pressure	RST138	≤ 0.25	≤ 0.35	0.30 ~0.90	≤ 0.040	≤ 0.040	-	-	-	-	-	-	-
		RST142	≤ 0.30	≤ 0.35	0.30 ~1.00	≤ 0.040	≤ 0.040	-	-	-	-	-	-	-
		RST238	≤ 0.25	0.10 ~0.35	0.30 ~1.10	≤ 0.035	≤ 0.035	-	-	-	-	-	-	-
		RST242	≤ 0.30		0.30 ~1.40			-	-	-	-	-	-	-
		RST249	≤ 0.33		0.30 ~1.50			-	-	-	-	-	-	-
		RST338	≤ 0.25		0.30 ~0.90			-	-	-	-	-	-	-
		RST342	≤ 0.30		0.30 ~1.00			-	-	-	-	-	-	-
NK	for pressure	grade 1 No3/ KSTPG 42	≤ 0.30	≤ 0.35	0.30 ~1.00	≤ 0.040	≤ 0.040	-	-	-	-	-	-	-
CCS	for pressure	360	≤ 0.17	≤ 0.35	0.40 ~0.80	≤ 0.040	≤ 0.040	≤ 0.25	≤ 0.30	≤ 0.30		≤ 0.10
		410	≤ 0.21	≤ 0.35	0.40 ~1.20	≤ 0.040	≤ 0.040	≤ 0.25	≤ 0.30	≤ 0.30		≤ 0.10
		460	≤ 0.22	≤ 0.35	0.80 ~1.40	≤ 0.040	≤ 0.040	≤ 0.25	≤ 0.30	≤ 0.30		≤ 0.10
		490	≤ 0.23	≤ 0.35	0.80 ~1.50	≤ 0.040	≤ 0.040	≤ 0.25	≤ 0.30	≤ 0.30		≤ 0.10