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Tubes for Ship-building

Tubes for Ship-building

tubes-for-ship-building1

Seamless steel pipe for ship building usage

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.

Field of Application:
Products is designed and manufactured for boilers, supeiheaters and pressure systems of ships.

Steel Grade: 320, 360, 410, 490

 

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%

Mechanical 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

Note
residual elements:Cr<=0.25%,Mo<=0.10%,Ni<=0.30%,Cu<=0.30%, aggregate≤0.70%

Length: 25 meters maximum, we advice 11.8 meters max.
Surface condition: bright annealed and pickled
Packing: plastic pipe cap, plastic bag and steel strips bundled
Delivery Conditions: Annealed, Normalized, Normalized and Tempered

Inspection and Test:

Chemical Composition Inspection, Mechanical Properties Test(Tensile Strength,Yield Strength, Elongation, Flaring, Flattening, Hardness, Impact Test), Surface and Dimension Test,No-destructive Test, Hydrostatic Test.
Surface treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.

About NCTV

www.yaang.com provide a wide range of steel products as Steel pipe, Steel pipes and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.

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