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.

Tubes for ship building

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.

steel pipes and tubes for shipbuilding
Classification of ships:

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

Seamless steel tube and pipe for ship building usage
Society Standard or usage Steel grade   chemical composition, %
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
0.30
~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.



Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.



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