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China LSAW Steel Pipe Suppliers - Quality Longitudinal Submerged Arc Welded Pipe from Reliable Factory
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 LSAW pipe manufactured?
LSAW stands for Longitudinal Submerged Arc Welding. LSAW pipes are manufactured from hot-rolled steel plates that are formed into a cylindrical shape using either the UOE process (U-shape → O-shape → Expansion) or the JCOE process (J-shape → C-shape → O-shape → Expansion), followed by internal and external welding using Submerged Arc Welding (SAW) technology.
Q What are the standard outer diameter and wall thickness ranges for LSAW pipe?
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), making them suitable for large-scale pipeline infrastructure projects.
Q Which international standards apply to LSAW steel pipe?
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.
Q What surface treatment options are available for LSAW pipes?
LSAW pipes can be supplied with various surface treatments to enhance corrosion resistance and service life, including: Bare, Black painting, Varnish, Anti-rust oil, 3PE coating, FBE (Fusion Bonded Epoxy), Epoxy coating, and Concrete Weight Coating (CWC) for subsea or buried pipeline applications.
Q What quality inspections are performed on LSAW pipes?
LSAW pipes undergo rigorous quality control procedures, including Chemical Analysis, Mechanical Testing (Tensile, Impact, Hardness), Hydrostatic Testing, Non-Destructive Testing (NDT) such as Ultrasonic Testing (UT), Radiographic Testing (RT), Magnetic Particle Testing (MT), and Penetrant Testing (PT), as well as Dimensional Inspection.
Q What are the main applications of LSAW steel pipe?
LSAW steel pipes are primarily used for long-distance transportation of oil, natural gas, and other fluids. Due to their large diameter, high strength, and excellent weld quality, they are also widely used in offshore pipelines, structural piling, water transmission, and high-pressure fluid conveyance projects.