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 Chinese national standard

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 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（％）
Standard code	Models of steel tubes	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

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

Note：

residual elements:Cr≤0.25％，Mo≤0.10％，Ni≤0.30％，Cu≤0.30％aggregate≤0.70％

Appication:

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

Model N0．of major steel tubes
320，360，410，460，490，etc．

Delivery status	Abbreviation	Description
Cold-finished/hard (cold-finished as-drawn)	BK	No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)	BKW	After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed	GBK	After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized	NBK	The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

Delivery status

Abbreviation

Description

Cold-finished/hard
(cold-finished as-drawn)

No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.

Cold-finished/soft
(lightly cold-worked)

BKW

After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.

Annealed

GBK

After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.

Normalized

NBK

The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

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Ship building tubes

Classification of ships:

Mechanocal properties：

Chemical compisition:

Seamless steel tube and pipe for ship building usage

Note：

Tech & Service of Seamless pipe

How to make seamless pipe(seamless pipe process)?

Condition on delivery:

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