X80 LSAW Steel Pipe

Product Overview

X80 LSAW pipe is a longitudinal submerged arc welded steel pipe customized for long-distance oil and gas transmission. Medium-thick steel plates are used as raw materials, formed into tube blanks by molding equipment, then processed with double-sided submerged arc welding and diameter expansion to complete finished pipes.

The welds of X80 LSAW steel pipe possess great toughness, plasticity, uniform texture, and compact internal structure. It features a large outer diameter, thick wall, high pressure resistance, good low-temperature performance, and strong corrosion resistance. Its core advantages are high strength, high toughness, and stable straight weld quality. It can reduce pipe wall thickness and project cost while satisfying high-pressure safe transportation requirements, widely used in global energy infrastructure projects.

Full Production Process & Quality Control

All production steps from steel plate to finished pipe are monitored to guarantee stable quality. Pretreatment Stage: Steel plates are processed by controlled rolling, controlled cooling, and offline tempering. Plate thickness ranges from 6mm to 40mm, with width matched to pipe circumference as required.

Forming Stage: Precise forming ensures stable pipe roundness and uniform wall thickness, suitable for various OD and WT specifications. Single pass forming reduction is controlled under 3mm to prevent plate work hardening. Hydraulic expanding limits pipe ovality to ≤0.8%.

Post-Weld Heat Treatment: Weld parts are heated to 600-650°C, holding time depends on wall thickness, then slowly cooled in furnace to 300°C and air cooled, removing over 80% welding residual stress.

Finished Pipe Inspection: Pipes are cut to fixed lengths, both ends beveled and pre-treated for anti-corrosion coating. All finished pipes pass NDT, hydrostatic test, and mechanical performance test before delivery.

Factory Capacity & Applicable Standards

Applicable Standards: API 5L PSL1 & PSL2, API SPEC 2B, GB/T9711, ISO3183, EN10219, ASTM A672, ASTM A671, ASTM A691

Max Steel Grade: API 5L PSL2 X80N

Two Independent Production Lines: LSAW Pipe Production Line OD range: 457mm-1422mm, Wall Thickness: 8mm-50mm, Annual output: 150,000 tons

Anti-Corrosion Coating Line Supports FBE & 3LPE coating OD range: 219mm-1620mm, Wall Thickness: 8mm-50mm, Total annual coating capacity: 600,000 square meters

Overseas Engineering Case

Project Name: New Zealand National Convention Centre Project Year: 2015 Applied Material: C350L0 structural steel and X80 LSAW steel pipe Project Introduction: This landmark public building sits in central Auckland. Two large public artworks covering 5,760 sqm are mounted on four exterior walls, commissioned by SKYCITY Entertainment Group. Our structural steel and LSAW pipes are adopted for underground pipeline and foundation support systems of this project.

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