Marine Seamless Steel Pipes for Offshore Applications

High-strength, Corrosion-resistant Pipes For Marine Environments

Marine seamless steel pipes provide superior corrosion resistance and strength for demanding marine and offshore applications.

Marine Seamless Steel Pipes Corrosion Resistant Pipes Seamless Steel Tubes Marine Piping Systems +2 More

Marine Seamless Steel Pipes for Offshore Applications

High-strength, Corrosion-resistant Pipes For Marine Environments

Marine seamless steel pipes provide superior corrosion resistance and strength for demanding marine and offshore applications.

Marine Seamless Steel Pipes Corrosion Resistant Pipes Seamless Steel Tubes Marine Piping Systems +2 More

Marine Seamless Steel Pipes are precision-engineered, seamless steel tubes designed for marine piping systems and offshore applications. These pipes, conforming to standards such as ASTM A106, API 5L, and DIN 1629, offer exceptional corrosion resistance and high strength, making them ideal for harsh marine environments, including shipbuilding, offshore platforms, and marine pipelines.

Manufactured through hot-rolling or cold-drawing processes, Seamless Steel Tubes achieve tight dimensional tolerances and smooth surfaces, ensuring reliable performance under high pressure and corrosive conditions. Available in sizes ranging from 1/2” to 24” (DN15 to DN600) with wall thicknesses from SCH 10 to SCH 160, they are often coated with protective layers like zinc, epoxy, or 3LPE to enhance durability against seawater corrosion. Materials such as carbon steel (A106 Gr. B), alloy steel (A335 P11), and stainless steel (316L) are selected based on application requirements.

Marine Seamless Steel Pipes address challenges like pipeline corrosion, high-pressure fluid transmission, and structural integrity in marine and offshore systems. Their seamless construction eliminates weak points, ensuring safety and longevity in critical applications.

Key Benefits

Corrosion Resistance

Zinc, epoxy, or 3LPE coatings protect against seawater corrosion.

High Strength

Withstands pressures up to 70 MPa for reliable performance.

Seamless Construction

Eliminates weak points, ensuring structural integrity.

Smooth Surface

Ra ≤ 1.6 µm reduces friction and enhances fluid flow.

Cost-Effective

Durable coatings reduce maintenance and replacement costs.

Customizable Sizes

Available in various diameters and lengths up to 12 m.

Marine Seamless Steel Pipes for Offshore Applications

Classification of ships

Specifications of Marine Seamless Steel Pipe Table 1 Grade of Seamless Steel Pipe (Pressure Tubing)

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 Carbon and carbon-manganese steel seamless steel tubes and pipes for ship

We can customize pipes in accordance with your requirements, available for large diameter, small diameter, heavy wall, thin wall…

Chemical Composition of Steel Grades by Classification Society (wt%)
Society	Standard or Usage	Steel Grade	C	Si	Mn	P	S	Cr	Ni	Cu	Al	Mo	V	P+S
GLR	Non alloy	GL-R 410	≤0.21	≤0.35	≤1.4	≤0.025	≤0.02	-	-	-	≥0.020	-	-	-
	GB 18248	37Mn	0.34~0.40	0.1~0.30	1.35~1.65	≤0.03	≤0.03	≤0.3	≤0.3	≤0.2	-	-	-	≤0.055
	EN 10297	34CrMo4	0.3~0.37	≤0.4	0.6~0.90	≤0.035	≤0.035	0.9~1.20	-	-	-	0.15~0.30	-	-
DNV	for pressure ASTM A53/A53M	A53B	≤0.3	-	≤1.2	≤0.05	≤0.045	≤0.4	≤0.4	≤0.4	-	≤0.15	≤0.08	-
DNV	for pressure ASTM A53/A53M
ABS	for pressure	Grade 3	≤0.3	-	≤1.2	≤0.05	≤0.045	≤0.4	≤0.4	≤0.4	-	≤0.15	≤0.08	-
BV	for pressure	410HB	≤0.21	≤0.35	0.4~1.20	≤0.04	≤0.04	-	-	-	-	-	-	-
LR	for pressure	410	≤0.21	≤0.35	0.4~1.20	≤0.045	≤0.045	≤0.25	≤0.3	≤0.3	-	≤0.15	-	-
KR	for pressure	RST138	≤0.25	≤0.35	0.3~0.90	≤0.04	≤0.04	-	-	-	-	-	-	-
		RST142	≤0.3		0.3~1.00	≤0.04	≤0.04	-	-	-	-	-	-	-
		RST238	≤0.25	0.1~0.35	0.3~1.10	≤0.035	≤0.035	-	-	-	-	-	-	-
		RST242	≤0.3		0.3~1.40			-	-	-	-	-	-	-
		RST249	≤0.33		0.3~1.50			-	-	-	-	-	-	-

		RST338	≤0.25		0.3~0.90			-	-	-	-	-	-	-
		RST342	≤0.3		0.3~1.00			-	-	-	-	-	-	-
NK	for pressure	grade 1 No3/ KSTPG 42	≤0.3	≤0.35	0.3~1.00	≤0.04	≤0.04	-	-	-	-	-	-	-
CCS	for pressure	360	≤0.17	≤0.35	0.4~0.80	≤0.04	≤0.04	≤0.25	≤0.3	≤0.3		≤0.10
		410	≤0.21	≤0.35	0.4~1.20	≤0.04	≤0.04	≤0.25	≤0.3	≤0.3		≤0.10
		460	≤0.22	≤0.35	0.8~1.40	≤0.04	≤0.04	≤0.25	≤0.3	≤0.3		≤0.10
		490	≤0.23	≤0.35	0.8~1.50	≤0.04	≤0.04	≤0.25	≤0.3	≤0.3		≤0.1

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

Comparison of Honed Tubes with Standard Tubes
Feature	Honed Tubes	Standard Tubes
Material Type	Carbon/Alloy Steel (ST52, E355)	Carbon Steel
Surface Finish	Ra ≤0.4 µm (Honed/SR-B)	Ra ≥1.0 µm
Tolerance	H7–H9	H11 or lower
Tensile Strength (MPa)	515–600	400–500
Applications	Hydraulic/Pneumatic Cylinders	General Piping
Cost	Higher (precision processing)	Lower
Key Advantage	Precision bore, extended seal life	Cost-effective for non-precision uses

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Standards and Specifications

• Marine seamless steel pipes specifications
• ASTM A106 marine piping standards
• API 5L seamless steel tubes
• DIN 1629 offshore steel pipes

Applications

• Marine piping systems applications
• Offshore platform steel pipes
• Corrosion resistant pipes for shipbuilding
• Seamless steel tubes for marine pipelines

Material and Grades

• A106 Gr. B seamless steel pipes
• A335 P11 marine pipes
• 316L stainless steel tubes
• Marine steel pipes chemical composition

Manufacturing and Testing

• Marine seamless steel pipes manufacturing
• Corrosion resistant coating for pipes
• Seamless steel tubes quality testing
• Marine pipes nondestructive testing

Note: Marine seamless steel pipes meet ASTM A106, API 5L, and DIN 1629 standards, offering corrosion resistance and high strength. Contact suppliers for detailed specifications.

Marine seamless steel pipes are seamless steel tubes designed for marine and offshore applications, offering corrosion resistance and high strength for piping systems.

Common materials include carbon steel (A106 Gr. B, API 5L Gr. B), alloy steel (A335 P11, P22), and stainless steel (304, 316L), often with protective coatings.

- A106 Gr. B: C ≤0.30%, Si 0.10–0.35%, Mn 0.29–1.06%, P ≤0.035%, S ≤0.035%
- A335 P11: C 0.05–0.15%, Si 0.50–1.00%, Mn 0.30–0.60%, P ≤0.025%, S ≤0.025%, Cr 1.00–1.50%, Mo 0.44–0.65%
- 316L: C ≤0.03%, Si ≤1.00%, Mn ≤2.00%, P ≤0.045%, S ≤0.030%, Cr 16.0–18.0%, Mo 2.0–3.0%, Ni 10.0–14.0%

- A106 Gr. B: Tensile ≥415 MPa, Yield ≥240 MPa, Elongation ≥30%, Hardness 130–160 HB
- A335 P11: Tensile ≥415 MPa, Yield ≥205 MPa, Elongation ≥30%, Hardness 163–190 HB
- 316L: Tensile ≥485 MPa, Yield ≥170 MPa, Elongation ≥40%, Hardness ≤217 HB

Outer diameters from 1/2” to 24” (DN15–DN600), wall thicknesses from SCH 10 to SCH 160, lengths up to 12 meters, customizable per requirements.

Hot-rolling or cold-drawing, followed by heat treatment, surface coating (zinc, epoxy, 3LPE), and nondestructive testing (ultrasonic, eddy current).

Ultrasonic testing, eddy current testing, hydrostatic testing, dimensional checks, and surface inspections to ensure quality and compliance.

Shipbuilding, offshore platforms, marine pipelines, hydraulic systems, desalination plants, and structural components in marine environments.

Marked with grade, size, and manufacturer details; packaged with anti-corrosion oil and protective wrapping or crates to prevent damage during transport.

Their seamless construction and corrosion-resistant coatings ensure durability, safety, and reliability in high-pressure and corrosive marine environments.

Industrial Applications

Marine Seamless Steel Pipes are essential for marine and offshore systems, delivering corrosion resistance and durability in shipbuilding, offshore platforms, and pipelines.

Shipbuilding

Used in piping systems for fuel, water, and hydraulic lines.

Offshore Platforms

Seamless pipes are used for transporting oil, gas, and other hydrocarbon products from offshore wells to onshore facilities.

Marine Pipelines

Transports oil, gas, and water in underwater pipelines.

Subsea

Powers actuators and control systems on ships.

Desalination Plants

Used in water treatment systems exposed to seawater.

Marine Structural Components

Supports structural applications in marine environments.

Why Marine Seamless Steel Pipes? Their seamless design and corrosion-resistant coatings ensure reliability and safety in harsh marine conditions.

Marine Seamless Steel Pipes for Offshore Applications

Marine Seamless Steel Pipes for Offshore Applications