S355JR LSAW Steel Pipe
roduct Overview
The S355JR LSAW steel pipe is a large-diameter straight seam welded pipe manufactured from S355JR low-alloy high-strength structural steel per EN 10025-2, using advanced double-sided submerged arc welding technology. This product combineshigh-strength steellarge-diameter, thick-wall welded pipeadvantages, widely used in oil & gas transmission, structural support, and piling projects where safety and reliability are paramount.
Superiority
S355JR is a hot-rolled weldable fine-grain structural steel defined in EN 10025-2. The "S" stands for structural steel, "355" indicates minimum yield strength of 355 MPa (for thickness ≤16mm), and "JR" signifies impact toughness ≥27J at room temperature.
Key Performance Indicators:
|
Property |
Typical Value |
|---|---|
|
Yield Strength (≤16mm) |
≥355 MPa |
|
Tensile Strength |
470-630 MPa |
|
Elongation |
≥ 21% |
|
Impact Energy (RT) |
≥27 J |
Key Characteristics:
Excellent Weldability:Low carbon content ensures stable welded joint quality
Good Workability:Supports cutting, drilling, bending, adaptable to various forming processes
Good Corrosion Resistance:Copper addition enhances atmospheric and seawater corrosion resistance
Equivalent to Chinese Q345Bfor easy material selection reference
Process Advantage: LSAW
LSAW pipes are manufactured from single steel plates formed into tube shells, welded using double-sided submerged arc welding, and mechanically expanded.
Core Process Features:
✅Superior Weld Quality
Dual pre-weld + finish-weld process ensures excellent toughness, plasticity, uniformity, and compactness; NDT pass rate exceeds 99%.
✅Low Residual Stress
Mechanical cold expansion results in uniform stress distribution, effectively preventing stress corrosion cracking.
✅High Dimensional Accuracy
Post-expansion roundness accuracy reaches ±0.1%D, facilitating on-site welding connections.
Operating Scenarios
LSAW pipes are designated by API standards as the preferred pipe type for demanding environments including alpine regions, subsea installations, and densely populated urban areas.
Primary Applications:
|
Sector |
Typical Uses |
|---|---|
|
Foundation |
Piling casings, underground shelter supports |
|
Municipal |
Water transmission lines, heating networks |
|
New Energy |
Wind turbine towers, photovoltaic support structures |
Assurance
Inspection Items:Chemical composition analysis, mechanical property testing (tensile/yield/elongation), flattening test, bending test, impact test, hydrostatic test, X-ray inspection
Mill Certificate:EN10204 3.1 traceability certificate
Surface Treatment:Bare, bitumen coating, 3PE, FBE epoxy coating, etc. (customizable)
Seasons
High Strength + Thick Wall- 355MPa yield strength combined with thick-wall design for demanding pressure conditions.
Straight Seam + SAW Process- Shorter weld seam, better quality control, superior reliability compared to spiral welded pipes.
European Material + International Certification- Compliant with global engineering standards, export-ready.
S355JR LSAW Steel Pipe - Solid Support for Major Projects.
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