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China LSAW Steel Pipe Suppliers - Quality Factory Grade Longitudinal Submerged Arc Welded Steel Pipe
Detailed Description of LSAW Pipe
LSAW steel pipe is a kind of large diameter steel pipe, which is mainly used for long-distance transportation of oil, natural gas and other fluids. Its manufacturing process begins with hot rolled steel plate, which is molded into a cylinder by UOE (sequentially bent into U-shape, O-shape and then enlarged) or JCOE (rolled edges and then sequentially bent into J-shape, C-shape, O-shape and then enlarged), and then finally welded inside and outside the weld seam by Submerged Arc Welding (SAW) technology, where the arc is covered by a layer of flux during the welding process.
Key Parameters for LSAW Pipe
| Parameter | Details |
|---|---|
| Standards | API 5L (PSL1, PSL2), ISO 3183, ASTM A252, ASTM A671, ASTM A672, EN10219, EN10217, DIN 2458, GB/T 9711-2023, GB/T3091, SY/T5037, ASTM A53, ASTM A500, EN10210, JIS G3444, GOST 20295 |
| Steel Grade |
API 5L: Gr.B, X42, X46, X52, X56, X60, X65, X70, X80
EN: S235JRH, S275J0H, S355J2H, S420MH, S460MH
ASTM A252: Gr.1, Gr.2, Gr.3, Cl various
ASTM A671/A672: CA55, CB60, CB65, CB70, CC60, CC65, CC70
GB/T 9711-2023: L245, L290, L320, L360, L390, L415, L450, L485, L555
GB/T 3091: Q195, Q215, Q235, Q355
SY/T 5037: Q235B, Q355B
EN 10210: S235JRH, S275J0H, S355J2H, S355NH, S420NH
GOST 20295: K34, K38, K42, K50, K52, K55, K60
|
| Outer Diameter (OD) | 406mm – 1626mm (16" – 64") |
| Wall Thickness (WT) | 6.0mm – 75mm (typically up to 50mm) |
| Length | 6m – 12.5m (commonly 12m SRL/DRL) |
| Pipe Ends | Beveled End (BE) as per ANSI B16.25, Plain End (PE) |
| Surface Treatment | Bare, Black painting, Varnish, Anti-rust oil, 3PE, FBE, Epoxy coating, Concrete Weight Coating (CWC) |
| Inspection | Chemical Analysis, Mechanical Testing (Tensile, Impact, Hardness), Hydrostatic Test, NDT (UT, RT, MT, PT), Dimensional Inspection |
Frequently Asked Questions (FAQ)
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Q What does LSAW stand for, and how is it different from other pipe types?LSAW stands for Longitudinal Submerged Arc Welding. Unlike SSAW (Spiral Submerged Arc Welding) pipes, LSAW pipes have a straight weld seam running along the pipe's length. This results in better dimensional accuracy, higher pressure resistance, and superior mechanical performance, making LSAW pipes the preferred choice for critical high-pressure pipeline applications.
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Q What are the main manufacturing processes used for LSAW pipes?LSAW pipes are primarily manufactured using two processes: UOE (the steel plate is pressed into a U-shape, then an O-shape, and finally expanded) and JCOE (the plate is progressively pressed into J, C, and O shapes before being expanded). Both methods use Submerged Arc Welding for the internal and external weld seams, ensuring deep penetration and high weld quality.
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Q What diameter and wall thickness range is available for LSAW pipes?LSAW pipes are available in outer diameters ranging from 406mm to 1626mm (16" to 64") and wall thicknesses from 6.0mm to 75mm (typically up to 50mm in standard production). This wide range makes them suitable for various large-scale pipeline and structural applications.
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Q Which international standards does LSAW pipe comply with?LSAW pipes can be produced to a wide range of international standards including API 5L (PSL1 & PSL2), ISO 3183, ASTM A252, ASTM A671, ASTM A672, EN10219, EN10217, DIN 2458, GB/T 9711-2023, GB/T3091, SY/T5037, ASTM A53, ASTM A500, EN10210, JIS G3444, and GOST 20295, covering most global project and procurement requirements.
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Q What surface treatment options are available for LSAW pipes?Multiple surface treatment options are available to suit different environmental and service conditions, including: Bare, Black painting, Varnish, Anti-rust oil, 3PE (Three-layer Polyethylene), FBE (Fusion Bonded Epoxy), Epoxy coating, and Concrete Weight Coating (CWC). The choice depends on the installation environment, corrosion protection requirements, and project specifications.
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Q What inspection and testing procedures are applied to LSAW pipes?LSAW pipes undergo rigorous quality control including Chemical Analysis, Mechanical Testing (Tensile, Impact, Hardness), Hydrostatic Testing, Non-Destructive Testing (NDT) — covering Ultrasonic Testing (UT), Radiographic Testing (RT), Magnetic Particle Testing (MT), and Penetrant Testing (PT) — as well as full Dimensional Inspection to ensure compliance with the applicable standards.