EN10219 S355J0H

EN10219 S355J0H LSAW Structural Welded Pipe

Brief Overview

Classified under European structural steel standard EN 10219, S355J0H straight submerged arc welded tube is manufactured with fine-grained carbon steel without alloy additives. It strikes a perfect balance between high tensile yield strength and outstanding low-temperature anti-shock capacity, with rigid limits on chemical composition and production workflows. Every finished pipe goes through comprehensive quality inspections to guarantee steady mechanical properties and flawless exterior quality, making it an indispensable structural component for large engineering works that demand robust strength and cold resistance.

Full Detailed Product Introduction

1. Raw Material & Mechanical Property Benchmarks

The tube adopts fine-grained plain carbon steel as base material with fixed performance thresholds:

Yield strength floor: 355MPa (applies to nominal wall thickness below or equal to 16mm)

Tensile strength scope: 470MPa to 630MPa

Cryogenic impact performance: Passes Charpy V-notch impact testing at 0°C; individual specimen impact energy reaches no less than 27J, with the average reading hitting 40J or above (test sample dimension: 10×10mm)

Hardness cap: Vickers hardness HV10 cannot exceed 265

Cold bending performance: Remains intact without fractures after 180° cold bending test

Stringent chemical element restrictions are implemented: total carbon equivalent CET ≤0.42%, carbon proportion ≤0.20%, manganese proportion ≤1.70%, sulfur impurity capped at 0.030% and phosphorus impurity limited to 0.025%.

2. Manufacturing & Welding Technical Specifications

Hot rolling treatment: Two alternative production routes are available – TMCP thermomechanical controlled rolling & cooling, or normalizing heat treatment

Pipe forming method: Cold forming techniques including UOE and JCOE forming processes

Welding standard: Submerged arc welding is mandatory for seam fabrication; post-weld thermal treatment is carried out to remove residual stress generated during welding

Full-scale non-destructive testing: 100% ultrasonic flaw detection following EN10160 specification, with testing sensitivity matching a 3mm equivalent flat-bottom hole

Dimensional error range: Outer diameter tolerance ranges from ±0.5% to ±1%; wall thickness allows deviation within ±10%

Surface quality criteria: No detrimental flaws such as surface cracks or folding marks that compromise service lifespan are permitted.

3. Primary Application Fields

Boasting exceptional weldability, stable integral structure and reliable low-temperature toughness, this LSAW pipe fits projects with strict mechanical performance standards:

Main load-bearing steel frameworks of super high-rise buildings

Weight-bearing structural parts for long-span bridge constructions

Steel components for offshore working platforms

All other heavy-load steel structural engineering projects

4. Custom Anti-Corrosion Treatment & Matching Pipe Products

Hot-dip galvanizing anti-rust coating can be customized on demand to extend service life. Compatible product series cover oil & gas delivery pipelines, spiral submerged arc welded foundation tubes like AS1163 C350 and Q345B grade.

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