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.

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 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
490 490-640 275 16

Chemical compisition:

Grade   Steel Grade C Si Mn S P Residual element
Standard   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
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.

steel pipes and tubes for shipbuilding
Seamless steel tube and pipe for ship building usage

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:
steel pipes and tubes for shipbuilding

Appication:

Model N0.of major steel tubes



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.