API 5L Gr.B-X80 PSL12

API 5L Gr.B ~ X80 PSL1 / PSL2 LSAW Line Pipe

1. Concise Copyable Version

Our LSAW longitudinal submerged arc welded line pipes are fully produced and inspected under official API 5L standards issued by the American Petroleum Institute, covering steel grades from Gr.B up to X80 with two quality tiers PSL1 and PSL2.

Manufactured via precise JCOE / UOE cold forming from premium carbon steel plates, these pipes deliver stable weld integrity, tight dimensional accuracy and outstanding pressure bearing capacity, ideal for large-diameter high-pressure oil & gas trunk pipelines.

Size range covers OD 406mm–1422mm and wall thickness 6–120mm. Strict chemical limits on carbon equivalent, sulfur and phosphorus guarantee reliable weldability and anti-corrosion performance. Multi-wire submerged arc welding and post-weld heat treatment optimize weld structure. PSL2 grade carries stricter standards for chemical composition, NDT and mechanical testing compared with PSL1. Widely deployed for long-distance gas transmission, deep-sea exploitation and arctic low-temperature pipeline projects. Custom anti-corrosion coatings and full specification customization are available.

2. Detailed Copyable Version

API 5L Gr.B-X80 PSL1/PSL2 LSAW Oil & Gas Transmission Pipe

Longitudinal Submerged Arc Welded (LSAW) pipe is the mainstream structural pipe for global oil and long-distance natural gas transportation infrastructure. All our production procedures and quality control protocols strictly comply with API 5L specifications released by the American Petroleum Institute.

Core Manufacturing & Material Advantages

We adopt high-grade hot-rolled steel plates as raw stock, shaped through mature JCOE or UOE precision forming technology. The finished pipes feature consistent welding quality, precise dimensional tolerances and robust pressure resistance, perfectly matching construction demands for large-diameter, high-pressure energy trunk lines.

Size spectrum: Outer diameter ranging 406mm to 1422mm, wall thickness options from 6mm to 120mm to fit all working pressure tiers.

Rigid chemical control: The standard sets clear ceilings for carbon equivalent, sulfur and phosphorus content of base plates, ensuring stable welding performance and natural corrosion resistance.

Take X70, a widely used pipeline grade, as an example: its yield strength sits between 485–635 MPa, with tensile strength of 570–760 MPa. Under -20°C low-temperature conditions, the base metal requires minimum 80 Joules impact energy while weld seams demand at least 60 Joules to prevent brittle fracture in cold environments.

Welding & Heat Treatment Process

Multi-wire submerged arc welding technology is adopted for production. Operators precisely lock welding heat input within 20–50 kJ/cm by synchronizing 3 to 5 welding wires simultaneously. Post-weld heat treatment is mandatory to refine internal weld microstructure and boost overall mechanical performance of joints.

Two Quality Grades: PSL1 & PSL2

API 5L classifies pipeline products into two distinct quality levels:

PSL1: Basic compliance for conventional land pipeline projects with standard inspection thresholds.

PSL2: Elevated control standards for chemical composition limits, full-coverage non-destructive testing and stricter mechanical property requirements, suited for critical, high-risk pipeline applications.

Wide Application Scenarios

This series of LSAW pipes has been applied to numerous landmark domestic and international energy projects, including transcontinental high-pressure natural gas lines like China West-to-East Gas Transmission and China-Russia Eastern Gas Pipeline. They also perform reliably under harsh operating conditions such as deep-sea oil & gas extraction and frigid polar zones. Our complete quality management system delivers stable safety assurance for long-distance energy conveyance. We offer tailored anti-corrosion coating solutions and flexible size customization to meet diverse project requirements.

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