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LSAW Steel Pipe - Large Diameter Double Submerged Arc Welded Tube for High-Pressure Oil & Gas Pipeline

Double-sided submerged arc welding on LSAW pipe - smooth internal weld bead and uniform external weld overlay

LSAW steel pipe mechanical expansion process - radial expansion for stress relief and precise OD sizing

LSAW steel pipe with beveled end and land - precision machined for butt-welding with internal chamfer

LSAW Steel Pipe

Keywords: Longitudinal Welded Pipe, Longitudinal Submerged Arc Welded Pipe, LSAW Pipe, EFW Pipe
Size: OD: 406mm ~ 1422 mm;WT: 6.4mm ~ 44.5mm;LENGTH: 5mtr ~ 12mtr
Standard & Grade: ASTM A53 Grade A/B/C
Ends: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Packing: Bundled/In Bulk, Plastic Caps Plugged, Waterproof Paper Wrapped
Usage: Used for Fluid Transmission, Structural Support in Industrial Construction
Feature: Large Diameter Steel Pipes
Application: Used For Oil/Gas/Water Transmission, Engineering/Offshore Projects


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Product Description of LSAW Steel Pipe

The UOE LSAW STEEL PIPE mill features the most advanced technology and processes, achieves high production efficiency and stable product quality, and is equipped with complete inspection equipment. UOE mill adopts U & O forming; the formed pipes are welded inside through five internal welding stations with three wires, and welded outside through four external welding stations with three wires. In accordance with different requirements of the customers, the welded pipe can be expanded either by mechanical or hydrostatic expansion to improve dimensional accuracy and eliminate residual stress.

Specifications

Outside Diameter 508mm- 1118mm (20"- 44")

Wall Thickness: 6.0- 25.4 mm (1/4"-1"

Quality Standards: API、DNV、ISO、DEP、EN、ASTM、DIN、BS、JIS、GB、CSA

Length: 9-12.3m (30'- 40')

Grades: API 5L A-X90,GB/T9711 L190-L625

JOCE LSAW STEEL PIPE is a large diameter longitudinal submerged arc welded (LSAW) pipe production line in China. The mill adopts a progressive bending process, featuring evenly distributed forming stress, high uniformity of dimension, infinite sizes variation&wide poduct range, and high flexibility, etc.

Specifications

Outside Diameter：Φ406mm- 1626mm (16" - 64" )

Wall Thickness：6.0- 75mm (1/4" - 3" )

Quality Standards：API、DNV、ISO、DEP、EN、ASTM、DIN、BS、JIS、GB、CSA

Length: 3- 12.5 m ( 10'- 41' )

Grades：API 5L A-X100, GB/T9711 L190-L690

LSAW (Longitudinal double submerge arc welding) carbon steel pipe is a type of SAW pipe made of steel plates that were hot rolled by JCOE or UOE forming technology. JCOE technology represents the shaping and forming processes involved during manufacturing as well as the inner and outer welding and cold expansion carried out after welding. LSAW pipe is used to convey low-pressure liquid or high-pressure petroleum or natural gas, and can also be used widely in structural supports or foundations. The advantage of the LSAW type is they could produce thicker wall thicknesses of pipes, up to 120mm.

Features:

- Large diameter steel pipes

- Thick walls

- High-Pressure resistance

- Low-temperature resistance

Tests:

- Chemical Component Analysis

- Mechanical Properties – Elongation, Yield Strength, Ultimate Tensile Strength

- Technical Properties – DWT Test, Impact Test, Blow Test, Flattening Test

- X-ray Test

- Exterior Size Inspection

- Hydrostatic Test

- UT Test

Q: What is an LSAW Steel Pipe, and how does it differ from ERW or Seamless pipes?
A: LSAW stands for Longitudinal Submerged Arc Welded steel pipe. It is manufactured by cold-forming thick steel plates into a cylindrical shape (using JCOE or UOE forming technology) and welding the longitudinal seam using submerged arc welding. LSAW pipes are specifically designed for large diameters and thick walls, offering superior high-pressure resistance, excellent low-temperature toughness, and uniform mechanical properties, making them ideal for critical oil, gas, and water transmission pipelines.

Q: Which international standards and steel grades do your LSAW pipes comply with?
A: We manufacture LSAW pipes in strict accordance with global standards, including API 5L, ASTM A252, EN 10219, and GB/T 9711. We supply a comprehensive range of steel grades, such as Q235, Q345, X42, X52, X60, X65, X70, and X80. Whether you need standard structural pipes or high-grade pipeline steel for extreme environments, our engineering team can provide the exact material match.

Q: What surface treatments and anti-corrosion options do you offer for LSAW pipes?

A: To ensure long-term durability in harsh environments, we provide comprehensive surface treatments. Standard options include Black Painted, Galvanized, and 3PE (Three-Layer Polyethylene) anti-corrosion coating. For specialized applications, we also offer polyurethane foam insulation and customized epoxy coatings to meet specific regional pipeline regulations.

Q: How do you ensure the quality and safety of the submerged arc welds?

A: Weld integrity is our top priority. Every LSAW pipe undergoes rigorous testing, including 100% Ultrasonic Testing (UT), X-Ray Inspection, and Hydrostatic Pressure Tests. We also perform mechanical property tests (elongation, yield strength, impact test) and DWT tests. Every shipment is accompanied by a comprehensive Mill Test Certificate (MTC), and we fully welcome third-party inspections (SGS, BV, TUV).

Q: How do you package LSAW pipes to prevent damage during ocean freight?
A: Given the large diameter and heavy weight of LSAW pipes, we use robust export-standard packaging. Pipes are securely bundled with steel strips, and both ends are protected with plastic caps to prevent edge damage and keep out debris. For added protection during long-distance sea freight, we can provide waterproof tarpaulins or custom wooden packaging according to your specific shipping requirements.

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Stainless Steel Pipe

Carbon Steel Pipe

Out Diameter		Wall Thickness(mm)
Inch	mm	6.4	7.1	7.9	9.53	12.7	14.3	15.9	19.1	22.2	25.4	28.6	31.8	34.9	38.1	41.3	44.5
16	406.4
18	457
20	508
22	559
24	610
26	660
28	711
30	762
32	813
34	864
36	914
38	965
40	1016
42	1067
44	1118
46	1168
48	1219
52	1321
56	1422
60	1524
64	1626

Types	Standard
Types	SY/T5040-2000	SY/T5037-2000	SY/T9711.1-1977	ASTM A252	AWWA C200-97	API 5L PSL1
Tube end OD deviation	±0.5%D	±0.5%D	-0.79mm～+2.38mm	<±0.1%T	<±0.1%T	±1.6mm
Wall thickness	±10.0%T	D<508mm, ±12.5%T	-8%T～+19.5%T	<-12.5%T	-8%T～+19.5%T	5.0mm<T<15.0mm, ±0.11
Wall thickness	±10.0%T	D>508mm, ±10.0%T	-8%T～+19.5%T	<-12.5%T	-8%T～+19.5%T	T≥15.0mm, ±1.5mm

Standard	Grade	Chemical Composition(max)%					Mechanical Properties(min)
Standard	Grade	C	Mn	Si	S	P	Yield Strength(Mpa)	Tensile Strength(Mpa)
GB/T700-2006	A	0.22	1.4	0.35	0.050	0.045	235	370
	B	0.2	1.4	0.35	0.045	0.045	235	370
	C	0.17	1.4	0.35	0.040	0.040	235	370
	D	0.17	1.4	0.35	0.035	0.035	235	370
GB/T1591-2009	A	0.2	1.7	0.5	0.035	0.035	345	470
	B	0.2	1.7	0.5	0.030	0.030	345	470
	C	0.2	1.7	0.5	0.030	0.030	345	470
BS En10025	S235JR	0.17	1.4	-	0.035	0.035	235	360
	S275JR	0.21	1.5	-	0.035	0.035	275	410
	S355JR	0.24	1.6	-	0.035	0.035	355	470
DIN 17100	ST37-2	0.2	-	-	0.050	0.050	225	340
	ST44-2	0.21	-	-	0.050	0.050	265	410
	ST52-3	0.2	1.6	0.55	0.040	0.040	345	490
JIS G3101	SS400	-	-	-	0.050	0.050	235	400
JIS G3101	SS490	-	-	-	0.050	0.050	275	490
API 5L PSL1	A	0.22	0.9	-	0.03	0.03	210	335
	B	0.26	1.2	-	0.03	0.03	245	415
	X42	0.26	1.3	-	0.03	0.03	290	415
	X46	0.26	1.4	-	0.03	0.03	320	435
	X52	0.26	1.4	-	0.03	0.03	360	460
	X56	0.26	1.1	-	0.03	0.03	390	490
	X60	0.26	1.4	-	0.03	0.03	415	520
	X65	0.26	1.45	-	0.03	0.03	450	535
	X70	0.26	1.65	-	0.03	0.03	585	570

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