Offshore Structural JCOE LSAW Steel Pipe

Product Overview

Our offshore structural steel pipe adopts mature JCOE double-sided submerged arc welding technology, a mainstream type of longitudinal submerged arc welded pipe in the industry. Longitudinal welded steel pipes are split into high-frequency straight seam pipes and submerged arc straight seam pipes based on forming craft, and JCOE pipes fall under the submerged arc welding category. This structural pipe stands out with streamlined production workflows, fast manufacturing speed and controlled comprehensive production cost, widely used for marine platform load-bearing frames and marine foundation piles.

Core Product Advantages

All offshore structural pipes are shaped via professional JCO molding equipment. The production forming sequence follows three precise pressing steps:

1. Pre-bent steel plate is step-pressed multiple times to form a J-shaped half-section;

2. The remaining half of the plate is continuously bent and pressed into a C-shape;

3. Two formed half-parts are combined to form an open O-shaped tube blank.

After forming, the tube blank undergoes double-sided submerged arc welding as core processing. High-current welding technology is adopted to raise welding efficiency while delivering stable, flawless weld seams. Multiple follow-up finishing & inspection procedures are carried out to ensure finished products fully comply with international industrial standards.

Complete Technical Parameter Sheet

Table

Material Cold Brittle Performance Explanation

Brittle fracture is the key failure mode for straight seam steel pipes under low-temperature service environments. As operating temperature drops below the ductile-brittle transition threshold, metal materials shift into a brittle state with drastically reduced impact resistance. This low-temperature brittleness risk is prominent for high-strength steel under low load conditions. Internal material defects including inclusions and pores act as inherent microcracks, accelerating brittle crack expansion. For this reason, material ductile-brittle transition temperature must be fully considered during design, matching the actual working temperature of project components.

Craft Difference: High-Frequency Straight Seam Welding Principle

High-frequency welded straight seam pipes utilize alternating current’s skin effect and proximity effect for molding. After strip steel is rolled into an incomplete circular tube blank, an induction coil and impedance magnet inside the tube form an electromagnetic induction loop. Concentrated thermal energy is generated at the pipe’s joint edges under electromagnetic effects, rapidly heating the welding zone to melting temperature. Roller extrusion fuses the metal crystal layers, and cooling finally forms a tight butt weld joint.

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