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LSAW steel pipe

LSAW Steel Tube

LSAW steel pipe is a type of steel pipe with longitudinal parallel welds.Refers to longitudinal submerged arc welded (LSAW or SAWL) pipes.Its other name is DSAW (Double Submerged Arc Welded) steel pipe.The production process of longitudinally welded pipes is simple, with high production efficiency, low cost, and rapid development. It is divided into UOE, RBE, and JCOE steel pipes.

LSAW Steel Pipe Info

Outside Diameter(O.D.): 406-1829mm(16"-72")

Wall Thickness(W.T.): 6-100mm

Length: 0.5-24M(Customized cutting of any length according to requirements)

Standard: API, ASTM, BS, DIN, JIS, API 5L, ASTM A53,DNV,ISO,GB,DEP,CSA.

Grade: API X42 X52 X60 X65 X70 GrA GrB GrC,S275J0H,S355JR,S355J0H,S355J2H,S355 S235 S420 S460 API 5L A-X100, GB/T9711 L190-L690

Tolerance: ±5%T or as required for wall thickness/<±0.1%T or as required for outside diameter.

Surface Treatment: Oil,Galvanized,Black ,Yellow Varnish coating or as required.

Certification: CE,EN,ISO,API,JIS,GB,BV,BC1,DNV,ABS,FPC,LEED,EPD,PhD,etc.

Production Cycle: About 30 days，Excluding LSAW steel pipes in stock.

MOQ: 2-5 Tons

Delivery Cycle: To South Africa: 45 days/To the Middle East: 30 days/To South America: 45 days/To North America: 30 days/To Russia: 7 days/To Europe: 45 days/To Korea: 5 days/To Japan: 5 days/To Vietnam: 15 days/To Thailand: 15 days/To India: 30 days/To Indonesia: 15 days/To Singapore: 15 days

Test: X ray test/UT test/Surface inspection/Flattening test/Magnetic particle testing/Water pressure testing/Chemical composition testing/Impact test/yield strength test/tensile strength test/elongation test/Blow Test/DWT Test

Transport：Equipped with professional loaders and convoys to ensure that goods are not damaged.

Payment method: TT/LC

Why US?

Tight and aesthetically pleasing welds

Each weld is welded three times with tight and beautiful welds to ensure the quality of the pipe is up to standard.

Large production capacity

The LSAW steel pipe production capacity of Yuantai Derun is relatively large, which can ensure timely delivery of customer orders.

Strict quality control

From raw materials to SAWL steel pipe products, Yuantai Derun has strict quality control processes to ensure that every pipe leaves the factory as a qualified product.

Complete qualifications

One of the few fully qualified pipe factories in China, straight seam steel pipes are one of the core products of Yuantai Derun, and we can cooperate with customers to bid for projects. Such as BC1,DNV,BV,CE,ISO,CE,API 5L,etc.At the same time, Yuantai Derun is also a certified lsaw pipe manufacturer in China.

Multiple project participants

The national "West-East gas transmission" project

Bird's Nest Project

Qatar World Cup Project

Kuwait Airport Project,etc.

LSAW Steel Pipe Specification Table

Outside Diameter(O.D.)		Wall Thickness(W.T.)							Length(M)
Inch	MM	Min.Yield Strength(Mpa)
Inch	MM	245(B)	290(X42)	360(X52)	415(X60)	450(X65)	485(X70)	555(X80)
16	406	6.0-14.0	6.0-13.0	6.0-12.0	6.0-11.0	6.0-10.5	6.0-10.0	6.0-9.0	0.5-24M
18	457	6.0-15.0	6.0-14.0	6.0-13.0	6.0-12.0	6.0-11.5	6.0-11.0	6.0-10.0	0.5-24M
20	508	6.0-16.0	6.0-15.0	6.0-14.0	6.0-13.0	6.0-12.5	6.0-12.0	6.0-11.0	0.5-24M
22	559	6.0-17.0	6.0-16.0	6.0-15.0	6.0-14.0	6.0-13.5	6.0-13.0	6.0-12.0	0.5-24M
24	610	6.0-18.0	6.0-17.0	6.0-16.0	6.0-15.0	6.0-14.5	6.0-14.0	6.0-13.0	0.5-24M
26	660	6.0-19.0	6.0-18.0	6.0-17.0	6.0-16.0	6.0-15.0	6.0-15.0	6.0-14.0	0.5-24M
28	711	6.0-20.0	6.0-19.0	6.0-18.0	6.0-17.0	6.0-16.5	6.0-16.0	6.0-15.0	0.5-24M
30	762	7.0-21.0	7.0-20.0	7.0-19.0	7.0-18.0	7.0-17.5	7.0-17.0	7.0-16.0	0.5-24M
32	813	7.0-22.0	7.0-21.0	7.0-20.0	7.0-19.0	7.0-18.5	7.0-18.0	7.0-17.0	0.5-24M
34	864	7.0-23.0	7.0-22.0	7.0-21.0	7.0-20.0	7.0-19.5	7.0-19.0	7.0-18.0	0.5-24M
36	914	8.0-24.0	8.0-23.0	8.0-22.0	8.0-21.0	8.0-20.5	8.0-20.0	8.0-19.0	0.5-24M
38	965	8.0-25.0	8.0-24.0	8.0-23.0	8.0-22.0	8.0-21.5	8.0-21.0	8.0-20.0	0.5-24M
40	1016	8.0-26.0	8.0-25.0	8.0-24.0	8.0-23.0	8.0-22.5	8.0-22.0	8.0-21.0	0.5-24M
42	1067	8.0-26.0	8.0-25.0	8.0-24.0	8.0-23.0	8.0-22.5	8.0-22.0	8.0-21.0	0.5-24M
44	1118	9.0-27.0	9.0-26.0	9.0-24.5	9.0-23.5	9.0-22.8	9.0-22.0	9.0-21.0	0.5-24M
46	1168	9.0-27.0	9.0-26.0	9.0-24.0	9.0-23.5	9.0-22.8	9.0-22.0	9.0-21.0	0.5-24M
48	1219	9.0-28.0	9.0-27.0	9.0-25.4	9.0-24.0	9.0-23.5	9.0-23.0	9.0-22.0	0.5-24M
52	1321	9.0-28.0	9.0-27.0	9.0-25.4	9.0-24.2	9.0-23.5	9.0-23.0	9.0-22.0	0.5-24M
56	1422	10.0-29.0	10.0-28.0	10.0-26.0	10.0-24.5	10.0-23.8	10.0-23.0	10.0-22.0	0.5-24M
60	1524	10.0-29.0	10.0-28.0	10.0-26.0	10.0-24.5	10.0-23.8	10.0-23.0	10.0-22.0	0.5-24M
64	1626	10.0-30.0	10.0-29.0	10.0-27.0	10.0-25.4	10.0-24.8	10.0-24.0	10.0-23.0	0.5-24M
68	1727	10.0-30.0	10.0-29.0	10.0-27.0	10.0-25.4	10.0-24.8	10.0-24.0	10.0-23.0	0.5-24M
72	1829	10.0-30.0	10.0-29.0	10.0-27.0	10.0-25.4	10.0-24.8	10.0-24.0	10.0-23.0	0.5-24M

How Are LSAW Steel Pipes Made?

1. Dotting: After the steel plate used for manufacturing large-diameter submerged arc welded straight seam steel pipes enters the production line, the entire plate is first subjected to ultrasonic testing;

2. Edge milling: Double sided milling is performed on the two edges of the steel plate using an edge milling machine to achieve the required plate width, edge parallelism, and groove shape;

3. Pre bending: The pre bending machine pre bends the edges to ensure that the plate edges have the required curvature;

4. Forming: First, press the pre bent half of the steel plate into a "J" shape on the JCO molding machine. The other half of the steel plate is also bent and pressed into a "C" shape, forming an opening. O-shaped

5. Pre welding: After the straight seam welded steel pipe joint is formed, gas shielded welding (MAG) is used for continuous welding;

6. Internal welding: The straight seam steel pipe is welded internally using vertical multi wire submerged arc welding (up to four wires);

7. External welding: Using vertical multi wire submerged arc welding to weld the outer surface of LSAW steel pipes;

8. Ultrasonic testing I: 100% inspection of the internal and external welds of longitudinal welded steel pipes and the base metal on both sides of the weld;

9. X-ray testing I: 100% X-ray industrial television testing of internal and external welds, using an image processing system to ensure detection sensitivity;

10. Expanding: Expanding the full length of submerged arc welded straight seam steel pipes, improving the dimensional accuracy of the steel pipes and improving the internal stress distribution of the steel pipes;

11. Hydrostatic test: Conduct a test on the root diameter of the expanded steel pipe on a hydraulic testing machine to ensure that the steel pipe meets the required test pressure. The machine has automatic recording and storage functions;

12. Chamfer: After passing the inspection, the steel pipe is processed at the pipe end to meet the required pipe end groove size;

13. Ultrasonic testing II: Ultrasonic testing is a one-time inspection of defects that may occur in longitudinally welded steel pipes after expansion and water pressure.

14. X-ray inspection II: X-ray industrial television inspection and pipe end weld inspection of steel pipes after expansion and hydrostatic testing;

15. Magnetic particle inspection of pipe end: This inspection is to discover defects at the pipe end;

16. Anticorrosive coating: Qualified steel pipes shall undergo anti-corrosion coating treatment according to user requirements.

What Are The Applications Of LSAW Steel Pipes?

LSAW steel pipes are mainly used in the petroleum industry, chemical industry, power industry, agriculture, urban construction, train stations, subways, pile driving pipes, and so on.JCOE lsaw and hsaw pipes play an important role in large pipeline projects, water and gas transmission projects, urban pipeline network construction, bridge piling, municipal construction and urban construction. In recent years,lsaw line pipe, as a new type of energy-saving and environmentally friendly building system, the steel structure building has been hailed as the "green building" of the 21st century. Tianjin Yuantai Derun Steel Pipe Manufacturing Group can also produce API 5L lsaw pipes, and has obtained relevant API 5L certification.In more and more high-rise and ultra-high-rise building design scheme to give priority to the use of steel or steel-concrete structural system, large-span buildings actively using space grid structure, three-dimensional truss structure, cable membrane structure and pre-stressed structural system, these are steel pipe in the construction of more application scenarios, and large-diameter, ultra-thick-walled steel pipe demand has also increased significantly.