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China LSAW Steel Pipe - High-Quality Submerged Arc Welded Pipe Suppliers & Factory for Oil and Gas
▶ 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)
Q
What does LSAW stand for, and how is it different from SSAW or ERW pipe?
LSAW stands for Longitudinal Submerged Arc Welding. Unlike SSAW (Spiral Submerged Arc Welded) pipe, which uses a helical weld seam, LSAW pipe features a straight longitudinal weld seam, offering superior pressure resistance and dimensional accuracy. Compared to ERW (Electric Resistance Welded) pipe, LSAW can achieve much larger diameters and greater wall thicknesses, making it ideal for high-pressure, large-diameter pipeline applications.
Q
What are the main manufacturing processes used for LSAW pipe?
LSAW pipe is primarily produced using two processes: UOE (the steel plate is pressed into a U-shape, then an O-shape, followed by mechanical expansion) and JCOE (the plate is progressively bent into J, C, and O shapes before expansion). Both methods use Submerged Arc Welding (SAW) for both interior and exterior weld seams, ensuring high weld quality and structural integrity.
Q
What size range is available for LSAW steel pipe?
LSAW pipe is available in outer diameters ranging from 406mm to 1626mm (16" to 64"), with wall thicknesses from 6.0mm to 75mm. Standard pipe lengths are typically 6m to 12.5m, with 12m being the most common for single random length (SRL) and double random length (DRL) supplies.
Q
Which international standards does LSAW pipe comply with?
LSAW pipe can be manufactured 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, SY/T 5037, GOST 20295, JIS G3444, and more. The appropriate standard depends on the application, region, and project specification.
Q
What surface treatment options are available for LSAW pipe?
LSAW pipe can be supplied with various surface treatments to meet corrosion protection requirements, including bare (untreated), black painting, varnish, anti-rust oil, 3PE coating, FBE (Fusion Bonded Epoxy) coating, epoxy coating, and Concrete Weight Coating (CWC) for subsea or offshore applications. The choice depends on the pipeline environment and service conditions.
Q
What inspection and testing methods are applied to LSAW pipe?
Quality assurance for LSAW pipe involves a comprehensive range of tests, including Chemical Analysis to verify material composition, Mechanical Testing (tensile, impact, and hardness tests), Hydrostatic Testing for pressure integrity, and Non-Destructive Testing (NDT) methods such as Ultrasonic Testing (UT), Radiographic Testing (RT), Magnetic Particle Testing (MT), and Penetrant Testing (PT), along with thorough Dimensional Inspection.