Seamless steel pipes for ships

Process: Hot rolling and cold drawing, normalizing and tempering
Surface: Clean inner wall, no cracks or burrs
Ra：≤3.2‑6.3μm
Material: Commonly used Q325-A, Q355C, GPC1
Specification: Outer diameter 14-457mm, wall thickness 2-45mm customizable

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OD*WT（mm）

32*3 38*4.5 42*5 48*5 57*6 76*8 89*8 108*8 159*10 Custom Specs

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Product Detail

Product Overview：

Seamless steel pipes for ships belong to the category of seamless steel pipes, which have strict technical requirements for the type of steel used in pipe making. Seamless steel pipes for ships are suitable for Class I pressure resistant piping systems, Class II pressure resistant piping systems, boilers, and superheaters; The working temperature of carbon steel seamless steel pipes for ships should not exceed 450 ℃, while alloy steel seamless steel pipes are suitable for pipe wall working temperatures above 450 ℃. The specification range of seamless steel pipes for ships is 8-1240 × 1-200mm, and the mainstream material grades are C320, C360, C410, C460, C490.

Product List
Product Name:	GB5312 Seamless carbon steel and carbon manganese steel pipes for ships
Product Name:	320 seamless steel pipe for ships \| seamless pipe
Product Name:	410 seamless steel pipe for ships \| seamless pipe
Product Name:	Hot rolled seamless steel pipe for ships \| Seamless pipe
Product Name:	Cold drawn seamless steel pipe for ships \| Seamless pipe
Product Name:	National standard ship specific pipe \| Seamless steel pipe

Parameter range
Outer diameter	Φ6mm‑Φ219mm
Wall thickness	0.5mm‑20mm
Standard length	1‑12m， Support customization of short and long scales
Outer diameter accuracy	Maximum ± 0.03mm
Executive Standards	GB/T 5312, ASTM A106, EN 10216, DIN 17175
Non-standard customization	Customization of seawater resistant materials, groove processing, pressure resistant treatment, anti-corrosion technology, and precision inner hole processing can all be customized

Common specifications (steel grades: 320, 360, 410, 460, 490)
Outer diameter (mm)	32	38	42	48	57	76	89
Wall Thickness (mm)	3.0、3.5、4.0	3.0、3.5、4.5	3.5、4.0、5.0	3.5、4.0、5.0、6.0	3.5、4.0、5.0、6.0	4.0、5.0、6.0、8.0	4.5、5.0、6.0、8.0

Outer diameter (mm)	108	133	159	219	273	325
Wall Thickness (mm)	4.5、5.0、6.0、8.0	5.0、6.0、8.0、10.0	6.0、8.0、10.0、12.0	7.0、8.0、10.0、12.0	8.0、10.0、12.0、14.0	8.0、10.0、12.0

Optional tolerance range
Tolerance control	Optional manufacturing process
Tolerance ≤ 0.05 mm	Cold rolling
Tolerance ≤ 0.10 mm	Cold rolling
Tolerance ≤ 0.30 mm	Cold drawing \| Cold rolling
Tolerance ≤ 0.50 mm	Cold drawing \| Hot rolling
Tolerance ≤ 1.00 mm	Hot rolling \| Hot expanding

Tolerance of hot-rolled seamless steel pipes for ships
Outer diameter D (mm)	Outer diameter deviation (mm)	Wall thickness deviation
≤159	± 1.0% D, minimum ± 0.50	+15%S /‑10%S
159‑273	±1.0%D	+15%S /‑10%S
＞273	±1.25%D	+15%S /‑10%S
Cold drawn/cold-rolled seamless steel pipes for ships - tolerances
Outer diameter D (mm)	Outer diameter deviation (mm)	Wall thickness deviation
≤30	±0.20	+12.5%S /‑10%S
30‑50	±0.25	+12.5%S /‑10%S
＞50	±0.75%D	+12.5%S /‑10%S

Geometric tolerance
Oroject	Indicator
Ovalness	≤ 80% outer diameter tolerance
Straightness	≤1.5 mm/m
Note: CCS has additional inspection requirements, and higher accuracy must be specified in the contract.

Optional delivery status
Oil removal from oil pipes	Annealing and straightening	Steel pipe corrosion prevention
Steel pipe threading	Length cut-to-length	Steel pipe coating
Steel pipe cap	Exquisite bundling	Beveling

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Product Detail

Product Overview：

Product List
Product Name:	GB5312 Seamless carbon steel and carbon manganese steel pipes for ships
Product Name:	320 seamless steel pipe for ships \| seamless pipe
Product Name:	410 seamless steel pipe for ships \| seamless pipe
Product Name:	Hot rolled seamless steel pipe for ships \| Seamless pipe
Product Name:	Cold drawn seamless steel pipe for ships \| Seamless pipe
Product Name:	National standard ship specific pipe \| Seamless steel pipe

Parameter range
Outer diameter	Φ6mm‑Φ219mm
Wall thickness	0.5mm‑20mm
Standard length	1‑12m， Support customization of short and long scales
Outer diameter accuracy	Maximum ± 0.03mm
Executive Standards	GB/T 5312, ASTM A106, EN 10216, DIN 17175
Non-standard customization	Customization of seawater resistant materials, groove processing, pressure resistant treatment, anti-corrosion technology, and precision inner hole processing can all be customized

Common specifications (steel grades: 320, 360, 410, 460, 490)
Outer diameter (mm)	32	38	42	48	57	76	89
Wall Thickness (mm)	3.0、3.5、4.0	3.0、3.5、4.5	3.5、4.0、5.0	3.5、4.0、5.0、6.0	3.5、4.0、5.0、6.0	4.0、5.0、6.0、8.0	4.5、5.0、6.0、8.0

Outer diameter (mm)	108	133	159	219	273	325
Wall Thickness (mm)	4.5、5.0、6.0、8.0	5.0、6.0、8.0、10.0	6.0、8.0、10.0、12.0	7.0、8.0、10.0、12.0	8.0、10.0、12.0、14.0	8.0、10.0、12.0

Optional tolerance range
Tolerance control	Optional manufacturing process
Tolerance ≤ 0.05 mm	Cold rolling
Tolerance ≤ 0.10 mm	Cold rolling
Tolerance ≤ 0.30 mm	Cold drawing \| Cold rolling
Tolerance ≤ 0.50 mm	Cold drawing \| Hot rolling
Tolerance ≤ 1.00 mm	Hot rolling \| Hot expanding

Tolerance of hot-rolled seamless steel pipes for ships
Outer diameter D (mm)	Outer diameter deviation (mm)	Wall thickness deviation
≤159	± 1.0% D, minimum ± 0.50	+15%S /‑10%S
159‑273	±1.0%D	+15%S /‑10%S
＞273	±1.25%D	+15%S /‑10%S
Cold drawn/cold-rolled seamless steel pipes for ships - tolerances
Outer diameter D (mm)	Outer diameter deviation (mm)	Wall thickness deviation
≤30	±0.20	+12.5%S /‑10%S
30‑50	±0.25	+12.5%S /‑10%S
＞50	±0.75%D	+12.5%S /‑10%S

Geometric tolerance
Oroject	Indicator
Ovalness	≤ 80% outer diameter tolerance
Straightness	≤1.5 mm/m
Note: CCS has additional inspection requirements, and higher accuracy must be specified in the contract.

Optional delivery status
Oil removal from oil pipes	Annealing and straightening	Steel pipe corrosion prevention
Steel pipe threading	Length cut-to-length	Steel pipe coating
Steel pipe cap	Exquisite bundling	Beveling