LSAW Steel Pipe

Your Professional LSAW Steel Pipe Supplier

Tianjin Shenzhoutong Steel Pipe Co.,Ltd is a manufacturer and exporter dedicated to steel pipe industry. There are three main kinds of products in our factory--ERW Steel Pipes, Spiral Steel Pipes and Oil Casing Pipes. The products are widely used in petroleum, natural gas, gas, coal, machinery, electric power, piling and other purposes.

Accept ODM/OEM Services
All steel pipes produced by our company can be customized to meet the specific requirements of various industries and applications. The customization process begins with a thorough consultation between our technical experts and the client to ensure that all specific needs are addressed.

Production Equipment
Our company utilizes state-of-the-art international technological equipment, including W-FF molding, solid-state high-frequency induction welding, ultrasonic testing, and magnetic flux leakage detection. We also employ high-end testing equipment such as metallographic analysis instruments, Vickers hardness testers, impact testing machines, spectrum analyzers, and universal testing machines.

Honor Certificates
Since its establishment, our company has achieved numerous international certifications and honors, including API 5L, API 5CT, ISO 9001-2008, CE Certificate, pressure pipe production license, industrial products production license, Chinese petroleum and petrochemical membership card, China Quality Product Certification, Tianjin Famous Brand, exemption product, and recognition as one of the top 100 private enterprises in Tianjin.

Sales Market
Our products are exported to regions such as the Middle East, South America, North America, the European Union, and Southeast Asia. Over the years, we have earned an excellent reputation among customers worldwide.

LSAW Api 5l Steel Pipe
Tianjin Shenzhoutong Steel Pipe Co.,Ltd is the top Lsaw pipe manufacturer in China,we have two production lines for the Lsaw Steel Pipes, O.D.Ф219.1mm-Ф1800mm and W.T 8mm-50mm.API 5L /ASTM A252...
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Structural Steel Pipe
Tianjin Shenzhoutong Steel Pipe Co.,Ltd is the top Lsaw pipe manufacturer in China,we have two production lines for the Lsaw Steel Pipes, O.D.Ф219.1mm-Ф1800mm and W.T 8mm-50mm.API 5L /ASTM A252...
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EN10219 S275JR S355JOH S355J2H LSAW Steel Pipe
EN10219 LSAW Steel Pipe is a cold-formed, welded structural hollow section manufactured to the European standard EN 10219 (Non-alloy and fine grain steels, cold-formed welded hollow sections)....
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API 5L LSAW Steel Pipe GrB X42 To X70
API 5L LSAW Steel Pipe GrB X42 To X70 is a high-performance welded pipe manufactured in compliance with the American Petroleum Institute (API) Specification 5L. It is primarily designed for the...
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Lsaw Steel Pipe For Structural
Products Description Tianjin Shenzhoutong Steel Pipe Co.,Ltd is the top Lsaw pipe manufacturer in China,we have two production lines for the Lsaw Steel Pipes, O.D.Ф219.1mm-Ф1800mm and W.T...
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ASTM A671 Low Temperature Steel Pipes
ASTM A671 Low Temperature Steel Pipe – Trusted Partner for Africa's Energy & Infrastructure What Kind of Pipe Is This? In simple terms, ASTM A671 is a large-diameter, weldable,...
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ASTM A672 High-Pressure Pipes
ASTM A672 High-Pressure Electric-Fusion-Welded Pipe Designed for Extreme Climates and High-Pressure Service – Adaptable to Russian Regulatory Requirements Product Overview ASTM A672 covers...
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A53 Gr. B Heavy-Duty Applications Water Transmission Blac...
LSAW stands for Longitudinally Submerged Arc-Welded, also known as SAWL pipe. It uses steel plates as raw materials, is bent through JCOE or UOE molds, and then welded longitudinally by submerged...
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ASTM A672 EFW LSAW Steel Pipe
ASTM A672 EFW LSAW Steel Pipe is designed for high-pressure service at moderate temperatures. ASTM A672 covers welded pipe fabricated from pressure vessel quality plate, with filler metal added...
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ASTM A252 LSAW Steel Pipe Piles
ASTM A252 LSAW Steel Pipe Piles are high-strength, large-diameter tubular structural components designed specifically for deep foundation applications. They serve as permanent load-bearing members...
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ASTM A671 Low Temperature Steel Pipe
ASTM A671 Low Temperature Steel Pipe Product Positioning ASTM A671 electric-fusion-welded steel pipe is a practical choice for oil & gas, mining, water, and infrastructure projects across...
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ASTM A671 CL32 Welded Steel Pipe
ASTM A671 CL32 Welded Steel Pipe is produced by EFW or LSAW processing, fabricated from pressure vessel quality plate. The "CL32" designation refers to a specific class within this...
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Sizes of LSAW Steel Pipe

O.D.		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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3
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	6.0-12.3

Chemical Composition and Mechanical Properties of LSAW Steel Pipe

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

Types of LSAW Steel Pipe

1. UOE SAWL PIPES
Outside Diameter：Φ508mm- 1118mm (20"- 44")
Wall Thickness: 6.0-25.4mm 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

2. JCOE SAWL PIPES
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：3-12.5m ( 10'- 41' )
Grades：API 5L A-X100, GB/T9711 L190-L690

Production Equipment of LSAW Steel Pipe

Plate edge milling machine
The milling machine mills the two sides of the plate to exacting standards in order to meet width, edging and groove shape specifications.

Edge crimping machine
The crimping machine crimps the edges of the plate to form the required curvature.

Tack welding machine
The two edges of the open seam pipe are brought together by the tack welding machine. then welded by the tack welder using a metal active - gas arc welding("MAG" )process.

Forming machine
Utilizes the "JCO" process to bend and form the crimped steel plate into a steel pipe.

Interior welding machine
The interior longitudinal seam of the pipe is welded from the inside by fixing 4 welding heads while moving pipe and using submerged-arc welding process.

End facing machine
The machine levels the pipe end with rotating cutter heads to ensure that required groove and edge specifications are met.

Hydrostatic tester
Using end face sealing technology eliminates blind zones during hydrostatic testing. The tester is also equipped with automatic recording and storing functions.

Expanding machine
The pipe is subjected to full-length expansion to increase the precision of the pipe dimensions and to improve the internal stress distribution.

Surface Treatment Method of LSAW Steel Pipe

Cleaning
Grease, dust, lubricants, and organic matter adhering to the surface of the LSAW steel pipe, usually we use solvents and emulsions to clean the surface. However, the rust, oxide scale, and welding slag on the surface of the steel pipe cannot be removed, so that it needs tools.

Tools to remove rust
Steel pipe surface oxide scale, rust, welding slag, wire brush can be used to clean and polish the surface treatment. There are two types of tool rust removal: manual and power. Hand tools can reach Sa2 level, and power tools can reach Sa3 level.

Pickling
Common pickling includes chemical and electrolytic methods. However, only chemical pickling is used for anticorrosion of pipelines. Chemical pickling can able to get a certain degree of cleanliness and roughness on the surface of the steel pipe, which is convenient for subsequent anchor lines. Usually used as a reprocessing after shot blasting (sand).

Shot blasting to remove rust
The high-power motor drives the blades to rotate at high speed, so that steel grit, steel shot, iron wire segments, minerals and other abrasives are sprayed and projected on the surface of the steel pipe under the action of centrifugal force. On the one hand, rust, oxide and dirt are completely removed, on the other hand. The steel pipe achieves the required uniform roughness under the action of the violent impact and friction of the abrasive.

Quality Check of LSAW Steel Pipe

Magnetic force
Magnetic flaw detection can only find the appearance and appearance of magnetic straight seam welded pipe shortcomings, and the shortcomings can only do quantitative analysis, the nature and depth of the shortcomings can only be based on experience to estimate. Magnetic inspection is the use of magnetic field magnetization of ferromagnetic Longitudinal Welded Pipe leakage occurred to find the shortcomings. According to the measurement of magnetic flux leakage method is not the same, can be divided into magnetic powder method, magnetic induction method and magnetic recording method, during which the most widely used magnetic powder method.

Soaked inspection
Penetration test is the use of some of the liquid permeability and other physical properties to discover and show shortcomings, including the color check and fluorescence detection of two, can be used to view the appearance of ferromagnetic and non-ferromagnetic material shortcomings.

Ray detection
Radiographic testing is the use of ray penetrable material and attenuation in the material properties to detect defects in a method of detection. According to the different rays used in flaw detection, can be divided into X-ray detection, γ-ray detection, high-energy ray detection of three. Because of its shortcomings are not the same way, each ray detection are divided ionization method, fluorescent screen observation, photography and industrial television law. Ray inspection is mainly used to check the longitudinal seam weld internal cracks, not penetration, pores, slag and other shortcomings.

Ultrasonic flaw detection
Ultrasound in metal and other homogeneous media, because in the same media interface will occur on the reflection, and thus can be used for internal defects inspection. Ultrasonic can detect any weldment data, any part of the shortcomings, and can more sensitive to find the defect orientation, but the nature of the defect, shape and size of the more difficult to determine. So Longitudinal Welded Pipe Ultrasonic flaw detection and cooperation often used.

Applications of LSAW Steel Pipe

01/

Oil and Gas Transmission
LSAW steel pipes are commonly used in the oil and gas industry to transport crude oil, natural gas, and refined products over long distances due to their high strength and ability to withstand high-pressure environments.

02/

Pipeline Construction
LSAW steel pipes are commonly used in pipeline construction for purposes such as oil and gas transmission, water distribution, and slurry transportation due to their uniformity and reliability in conveying fluids and substances.

03/

Water Infrastructure
LSAW steel pipes are commonly used in water supply and sewage systems to transport clean water to cities and towns and carry away wastewater for treatment. Their durability and corrosion resistance make them ideal for these applications.

04/

Construction and Structural Applications
LSAW steel pipes are suitable for constructing various structures, including bridges, piers, buildings, and other engineering projects that require large-diameter pipes for load-bearing purposes.

05/

Piling
LSAW steel pipes are commonly used as foundation piles in civil engineering for structures such as buildings, bridges, and offshore platforms due to their ability to withstand heavy loads and external pressures.

06/

Marine Applications
LSAW steel pipes are commonly used in marine environments for applications such as underwater pipelines, offshore oil rigs, and submarine cable installation. This is due to their robustness and resistance to corrosion.

Shipment

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Our Factory

Tianjin Shenzhoutong Steel Pipe Co.,Ltd ,with total investment of RMB 260 million, was founded in 2001 and occupied 86,000 square meters and building area 28,000 square meters. It is located in the Chinese Steel Pipes Base - Da qiu zhuang, Tianjin. 46 kilometers away from Tianjin Port and 3 km away from the high-speed exit, So the transportation is very convenient. More than 400 employees and over 70 Senior staff are working in the company.

Our Certificate

FAQ

Q: What is the difference between LSAW and HSAW pipe?

A: LSAW is formed by bending individual plates to form a U-shape and then welding the edges to form a longitudinal joint; HSAW is formed by wrapping steel strips to form a helix and then welding the edges to form a spiral joint.

Q: What is the diameter of LSAW steel pipe?

A: LSAW pipes are produced by molding steel sheets to a cylinder and joining the ends together by welding in a straight line. The LSAW pipe diameter range is normally from 16inch to 60inch (406mm to 1500mm). They have good performances on high pressure resistance, and low-temperature corrosion resistance.

Q: What is the difference between ERW and LSAW pipes?

A: ERW steel pipe welding does not need to add welding wire; LSAW steel pipe requires welding wire. Both the inner and outer welds of the ERW steel pipe need to be removed, so it is beneficial to anti-corrosion; the extra height of the weld on the inner and outer walls of the LSAW steel pipe is not good for corrosion.

Q: What are the two kinds of steel pipes they are?

A: Mild steel pipes are not as strong or durable as carbon steel. Mild steel is a soft metal that can easily be bent and has a low melting point. Carbon steel, on the other hand, is stronger because it contains more carbon content than mild steel.

Q: How do you bend steel pipe without kinking it?

A: Purchase a bending spring that matches the diameter of the pipe and stuff it inside of the pipe you want to bend. Then, bend the pipe slowly by hand. The bending spring will keep the pipe from kinking as you bend it.

Q: How do you cut steel pipe straight?

A: When using an angle grinder or reciprocating saw, start the tool before contacting the pipe, then slowly lower the cutting disc until it contacts the surface. Apply steady pressure until it severs the pipe. When using a hacksaw, slowly draw the blade back and forth, making sure that the cut is straight.

As one of the most professional LSAW steel pipe manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to buy high-grade LSAW steel pipe from our factory.

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