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.



Tech & Service of Seamless pipe

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.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
How to calculate a steel pipe and tube theoretic weight
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.
Condition on delivery:

It refers to the state of final plastic deformation or final heat treatment of the delivered product. The hot-rolled or cold drawn (rolled) state or manufacturing state generally delivered without heat treatment; the heat-treated state after heat treatment delivery, or the normalizing, tempering, solid solution, annealing according to the type of heat treatment status.

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 according to actual weight or delivery according to theoretical weight

  • Actual weight - at the time of delivery, the weight of its product is delivered according to the weighing (weighing) weight;
  • Theoretical weight - The weight of the product at the time of delivery is calculated from the nominal size of the steel.
 


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