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LSAW Steel Pipe from China Suppliers - High-Quality Longitudinal Submerged Arc Welded Steel Pipe 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 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 (PSL1 / PSL2):
Gr.B, X42, X46, X52, X56, X60, X65, X70, X80
EN / EN 10210:
S235JRH, S275J0H, S355J2H, S420MH, S460MH, S355NH, S420NH
ASTM A252:
Gr.1, Gr.2, Gr.3, Cl various
ASTM A671 / ASTM 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
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 pipe?
LSAW stands for Longitudinal Submerged Arc Welding. Unlike SSAW (Spiral Submerged Arc Welding) pipe, which features a helical weld seam, LSAW pipe has a straight longitudinal weld seam running along the length of the pipe. This makes LSAW pipe better suited for high-pressure applications and large-diameter pipelines requiring strict dimensional tolerances.
Q
What are the main manufacturing processes for LSAW pipe?
LSAW pipe is produced using two primary methods: UOE (the steel plate is pressed into a U-shape, then an O-shape, and finally expanded) and JCOE (the plate is progressively bent into J, C, and O shapes before expansion). Both methods use Submerged Arc Welding (SAW) for both the internal and external weld seams.
Q
What diameter and wall thickness range is available for LSAW pipe?
LSAW pipe is available in outer diameters (OD) ranging from 406mm to 1626mm (16" to 64"), with wall thicknesses from 6.0mm to 75mm (typically up to 50mm in common applications). Standard lengths are 6m to 12.5m, with 12m SRL/DRL being the most common.
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 / A671 / A672 / A53 / A500, EN10219, EN10217, EN10210, DIN 2458, GB/T 9711-2023, GB/T 3091, SY/T 5037, JIS G3444, and GOST 20295, among others.
Q
What surface treatment options are available for LSAW pipe?
Several surface treatment options are available depending on the service environment: Bare, Black Painting, Varnish, Anti-rust Oil, 3PE (Three-Layer Polyethylene), FBE (Fusion Bonded Epoxy), Epoxy Coating, and Concrete Weight Coating (CWC) for subsea or buried pipeline applications.
Q
What inspection and testing procedures are applied to LSAW pipe?
LSAW pipe undergoes rigorous quality control including: Chemical Analysis to verify material composition, Mechanical Testing (Tensile, Impact, and Hardness tests), Hydrostatic Testing to confirm pressure integrity, and Non-Destructive Testing (NDT) methods such as Ultrasonic Testing (UT), Radiographic Testing (RT), Magnetic Particle Testing (MT), and Penetrant Testing (PT), as well as full Dimensional Inspection.