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.

Tubes for ship building

Seamless steel pipes 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

Appication:Seamless steel pipes for manufacturing marine boilers and ovemeaters as we as pressure pipes opf grade I and Ⅱ.
Model N0.of major steel pipe320,360,410,460,490,etc.

Types of steel pipes

Outer diameters

wall thickness

Cold-rolled pipes

pipe size(mm)

tolerances
(mm)
Pipe sizes
(mm)
Tolerances
(mm)

>30~50

±0.3

≤30

±10%

>50~219

±0.8%

Hot-rolled pipes

>219

±1.0%

>20

±10%


Mechanocal properties:

Standard code

Models of steel pipes

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 pipes

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%

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