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Seamless steel pipe for ship building usage

Date:2018-06-29    View:1255      Tag:Seamless steel pipe for ship building usage

Seamless steel pipe for shipbuilding is mainly used for piping system, 1 grade and 2 stage pressure piping for boiler and super heating unit.


Seamless steel pipe for shipbuilding is shipbuilding steel pipe designed for ship boiler, super heater and pressure system. Marine steel pipe can be widely used in CCS, DNV, LR, GL, ABS, BV, RINA, NK and other ships and Chinese 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 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.

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%

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