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ERW Pipe

Your Professional Erw 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.

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Parameter

 

Process

Electrical Resistance Weld

Standard

API 5L,ASTM A53,ASTM A36,ASTM A139,EN10210,EN10219

Material

GR.B,S235JRH,S275JOH,S275J2H,S355JOH,S355H2H

O.D

1/2"–26"(21.3–660mm)

W.T

0.055"–1.602"(1.65–26.97mm)

Length

As per customer's requirement

Surface Treatment

Bared, Black painted, Corrosion Resistant Coating + Cap

 

Grades of ERW Pipes

ASTM A53 Grade A/B

This grade is widely used for general structural and pressure applications. It is suitable for welding, bending, and flanging, making it versatile for various construction and engineering purposes.

01

API 5L Grade B/X42

API 5L is a standard specification for line pipe that specifies the manufacturing process, chemical composition, mechanical properties, and other requirements for seamless and welded steel pipes. Grade B and X42 are commonly used for conveying gas, water, and oil in the natural gas and petroleum industries.

02

ASTM A135

This specification covers two grades of electric-resistance-welded steel pipe intended for conveying gas, vapor, water or other liquid. It is commonly used in fire sprinkler systems due to its high resistance to corrosion and pressure.

03

ASTM A178

A grade widely used in boiler tubes and heat-exchanger tubes. It has good surface quality and excellent mechanical properties, making it suitable for high-temperature and high-pressure applications.

04

EN10217-1

This European standard specifies the requirements for straight seam welded steel tubes for pressure purposes. It includes various grades such as P195, P235, and P265, which are suitable for different pressure levels and temperatures.

05

 

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Surface Treatment Of ERW Pipes

 

 

Cleaning

Solvents and emulsions are used to clean the steel surface to remove oil, grease, dust, lubricants and similar organic matter. However, it cannot remove rust, scale, flux, etc. on the steel surface, so it is only used as an auxiliary means in anti-corrosion production.

Tool rust removal

Mainly use tools such as wire brushes to polish the steel surface to remove loose or lifted scale, rust, welding slag, etc. The rust removal of hand tools can reach Sa2 level, and the rust removal of power tools can reach Sa3 level. If the iron oxide scale is firmly attached to the surface of the steel, the tool rust removal effect will not be ideal and the anchor pattern depth required for anti-corrosion construction will not be achieved.

Pickling

Generally, chemical and electrolytic methods are used for pickling treatment. Only chemical pickling is used for pipeline anti-corrosion, which can remove scale, rust, and old coatings. Sometimes it can be used as a reprocessing after sandblasting and rust removal. Although chemical cleaning can achieve a certain degree of cleanliness and roughness on the surface, its anchor lines are shallow and it can easily cause environmental pollution.

Spray (throw) rust removal

Professional quality inspectors will conduct a quality inspection on each batch of products. Authoritative test reports are also available

 

Optional ERW Pipe Welding Styles
 

High-Frequency Welding (HFW)
High-Frequency Welding, commonly abbreviated as HFW, is one of the primary methods utilized in ERW pipe manufacturing. It includes passing a high-frequency current through the edges of the steel strip, triggering them to heat and melt. Once the edges are in a molten state, they are pressed together to form a bond. The resulting weld is characterized by its strong joint and relatively very little heat-affected zone. The effectiveness of HFW depends on its capability to accomplish a quick welding speed, making it appropriate for high-volume production.

 

Contact Welding
Contact welding is a strategy that includes applying pressure to the edges of the steel strip and concurrently passing an electrical current through them to create the weld. This method is frequently utilized in the production of ERW pipes with smaller sizes. In contact welding, the pressure used plays a significant role in attaining a proper bond in between the edges. Extreme pressure can lead to material contortion, while insufficient pressure can lead to a weak joint.

 

Induction Welding
Induction welding is another method used in ERW pipe manufacturing. This strategy utilizes the concept of electromagnetic induction to warm the edges of the steel strip. A rotating current is travelled through a coil, generating a magnetic field that causes eddy currents in the strip, triggering it to heat up and subsequently weld. Induction welding uses the advantage of exact heat control, which can help reduce the heat-affected zone and avoid extreme material distortion. It is particularly useful for producing pipelines with thinner walls and diameters.

 

Laser Welding
While less commonly utilized in ERW pipe production due to its higher cost, laser welding is a technique that provides extraordinary precision and control. A high-energy laser beam is concentrated on the edges of the steel strip, melting them and developing a weld joint.

 

Applications of Erw Pipe

Oil and Gas Industry
ERW pipes are extensively used in the oil and gas industry for various applications, including pipelines for transporting crude oil, natural gas, and petroleum products. They are used both onshore and offshore due to their ability to withstand high-pressure and corrosive environments.

 

Water Supply and Plumbing
ERW pipes are widely used in water supply systems, including potable water distribution, irrigation, and plumbing applications. They are preferred for their strength, durability, and resistance to corrosion, making them suitable for both underground and aboveground installations.

 

Construction and Infrastructure
ERW pipes are commonly used in the construction industry for structural purposes. They are utilized in the construction of buildings, bridges, towers, and other infrastructure projects. ERW pipes provide the necessary strength and stability required in structural applications.

 

Mechanical and Engineering Applications
ERW pipes find use in various mechanical and engineering applications where strength and durability are crucial. They are employed in the manufacturing of machinery, equipment, frames, supports, and frameworks. ERW pipes are also used in the automotive industry for exhaust systems, chassis components, and other mechanical parts.

 

Agriculture and Irrigation
ERW pipes are widely used in agricultural applications for irrigation systems, water supply to farms, and drainage systems. They are chosen for their ability to withstand harsh conditions and provide efficient water flow.

 

HVAC Systems
ERW pipes are used in heating, ventilation, and air conditioning (HVAC) systems for transporting hot and cold fluids. They are employed in commercial and residential buildings for applications such as central heating, cooling, and water circulation.

 

General Industrial Applications
ERW pipes find utility in various industrial sectors for conveying fluids, gases, and solids. They are employed in the manufacturing, processing, and distribution of chemicals, pharmaceuticals, food and beverages, pulp and paper, and other industrial products.

 

Structural Applications
ERW pipes are used in the fabrication of structures, such as handrails, scaffolding, signposts, and fences. Their strength, durability, and ease of fabrication make them suitable for such applications.

 

 

 

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.

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Our Certificate

 
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FAQ

 

Q: What is the ASTM standard for ERW pipe?

A: ASTM A53 Grade B ERW Pipe is a carbon steel pipe that comes under the ASTM A53 specification. The pipes range in dimensions according to the ASTM, ASME and API standards. The sizes of the pipes range from ½ inches to 36 inches in nominal bore sizes.

Q: How to calculate ERW pipe weight?

A: Where: OD = outer diameter of the pipe. THK = thickness of the pipe. L = length of the pipe.

Q: What is the difference between EFW and ERW pipe?

A: ERW (electric resistance welding) and EFW (electron beam welding) pipes differ in their manufacturing process, material thickness, cost, and applications:
● Manufacturing process
ERW is a group of welding processes that use electrical resistance to heat the material. EFW uses an electron beam to heat the edges of the pipe before joining them together.
● Material thickness
ERW is typically used for thinner materials, while EFW is suitable for thicker materials.
● Cost
ERW is generally more cost-effective than EFW.
● Applications
ERW is common in the automotive and construction industries, whereas EFW is used in high-pressure applications like chemical and petrochemical industries.

Q: Is ERW pipe seamless?

A: Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length. In Seamless pipe, there are no welding or joints and is manufactured from solid round billets.

Q: What is the process of ERW tubes?

A: Material Selection
Uncoiling the Steel Coil
Forming
ERW
Sizing and Straightening
Cutting to Length
End Finishing
Inspection and Quality Control

Q: What is the difference between ERW and saw pipe?

A: ERW Pipe is a cost-effective alternative to seamless pipes and more durable than SAW pipe. Defects are also less likely to occur compared to the solvent process used in SAW pipe, and the straight weld defects can easily be detected using ultrasonic reflection or by sight.

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

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