Product Description

Manufactured by seamless or welded (ERW, LSAW, SSAW) process from high-strength carbon steel. Features high pressure resistance, good weldability, excellent toughness, and consistent dimensional accuracy. Available grades: API 5L Gr B, X42, X46, X52, X56, X60, X65, X70, X80. Pipe type: seamless (OD 10.3–610mm), ERW (OD 21.3–610mm), LSAW (OD 406–1422mm), SSAW (OD 219–3048mm). Wall thickness: seamless 1.5–40mm; welded 3.0–60mm. Length: 6m, 12m, custom up to 18m. End finish: plain, beveled, or threaded with coupling. Surface finish: black (as-rolled), 3PE/FBE coated, or varnished. Manufacturing processes: seamless (hot finished or cold drawn), ERW (high-frequency welding), LSAW (JCOE/UOE), SSAW (spiral welding). 100% hydrostatic testing and NDT (UT, MT, RT) per PSL1/PSL2. Impact test temperature: -20°C to -46°C (grade dependent). Meets API 5L, ISO 3183, or GB/T 9711 standards. Custom lengths, coatings, and special end preparations available.

Parameter

Product Name	Steel Line Pipe (Oil & Gas Transmission)
Material / Steel Grades	API 5L Gr B, X42, X46, X52, X56, X60, X65, X70, X80 (PSL1 / PSL2)
Pipe Type	Seamless, ERW, LSAW, SSAW
Outer Diameter (OD)	Seamless: 10.3 – 610 mm; ERW: 21.3 – 610 mm; LSAW: 406 – 1422 mm; SSAW: 219 – 3048 mm
Wall Thickness	Seamless: 1.5 – 40 mm; Welded: 3.0 – 60 mm
Standard Length	6 m, 12 m, custom up to 18 m
End Finish	Plain, beveled (for welding), threaded with coupling
Surface Finish	Black (as-rolled), 3PE coated, FBE coated, or varnished
Manufacturing Process	Seamless (hot finished/cold drawn), ERW (HFW), LSAW (JCOE/UOE), SSAW (spiral)
Heat Treatment	Normalized, quenched & tempered, or as-rolled (grade dependent)
Yield Strength (Grade X70)	485 – 635 MPa (PSL2)
Tensile Strength (Grade X70)	570 – 760 MPa (PSL2)
Impact Test Temperature	-20°C to -46°C (as per grade and region)
NDT Inspection	100% Ultrasonic (UT), Hydrostatic; optional: RT, MT, ET
Corrosion Protection	Internal/external coating (3PE, FBE, fusion bonded epoxy) available
Standards	API 5L, ISO 3183, GB/T 9711
Custom Options	Length, coating type, end bevel, special NDT, PWHT

Application description

Widely used in long-distance oil and gas transmission pipelines, natural gas distribution networks, water transportation, slurry lines, and pipe jacking projects. Also suitable for offshore pipelines, refinery process piping, and structural applications (tunnel supports, culverts). High strength and pressure resistance make it ideal for onshore and offshore energy infrastructure.

Production description

Steel plate or coil is formed into pipe shape (seamless: pierced billet; welded: rolled and welded). Pipe is heat treated (normalized/Q&T if required), sized, inspected (UT, hydrostatic), and end-finished (beveled or threaded). Coating (3PE/FBE) applied optionally.

Shipping Packaging

For export, line pipes are fitted with plastic end caps, bundled with steel straps, packed on ISPM-15 pallets or steel skids, and secured with edge protectors. Coated pipes receive additional moisture-proof wrapping. Labels include grade, dimensions, length, and heat number for safe sea freight.

Why Choose Us?

1.Factory Strength:Direct manufacturer with integrated seamless and welded (ERW, LSAW, SSAW) pipe production lines, heat treatment furnaces, and in-house coating facilities (3PE, FBE), producing API 5L grades Gr B to X80 with consistent quality.

2.Quality Assurance:Strict control of chemical composition, mechanical properties (yield/tensile), impact toughness, and NDT (100% UT, hydrostatic); compliant with API 5L PSL1/PSL2, ISO 3183, GB/T 9711.

3.Certifications & Reports:Mill test certificates (MTC) with each shipment; third-party inspections (SGS, BV, Intertek) and impact test reports (including low temperatures) available upon request.

4.Customization & Service:Wide grade range (Gr B, X42–X80), diameters 10.3–3048mm, wall 1.5–60mm, custom lengths (6–18m), end finishes (beveled, threaded), coatings (3PE, FBE, black varnish), and fast lead times.

5.Export Packaging:Plastic end caps + moisture-proof wrapping (for coated pipes) + steel strapping + ISPM-15 pallets/steel skids + edge protectors + clear labeling for safe sea freight and corrosion protection.

FAQ

1. How should line pipes be stored before installation to prevent corrosion and damage?

Store on dry, level ground on wooden sleepers or steel skids, keep pipes elevated. Maintain original end caps and moisture-proof wrapping for coated pipes. For long-term outdoor storage, apply rust preventive oil on non-coated ends. Avoid stacking heavy loads that could deform the pipe.

2. What is the difference between PSL1 and PSL2 in API 5L?

PSL1 has basic chemical and mechanical requirements, no impact testing required, suitable for non-critical low-pressure service. PSL2 has stricter chemistry limits, mandatory impact testing at specified temperatures, and stricter NDT (UT, RT) requirements, required for high-pressure, sour service, and low-temperature applications. Choose PSL2 for critical oil/gas transmission.

3. Can line pipes be welded in the field, and what precautions are needed?

Yes. Use qualified low-hydrogen welding procedures matching the pipe grade (GMAW, SMAW, GTAW). For higher grades (X70, X80), control heat input to prevent HAZ softening. Preheat as required by wall thickness and grade. For coated pipes, remove coating 100-150mm from weld area and repair after welding with compatible coating.

CLIENT FEEDBACK

Has a professional foreign trade team and a well-established export service system. We have built long-term and stable cooperation relationships with customers from Southeast Asia, the Middle East, Africa, South America, and other regions.

CUSTOMER VISIT

We sincerely welcome global partners to contact us for mutual growth. With high-quality products and professional service, we look forward to working with you to create a prosperous future together.

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