Custom Fire Fighting Pipes,Seamless and Welded Steel Pipes Manufacturer Since 1991.
Erw Pipe Manufacturer
Baolai Group supplies ERW steel pipes for pipeline, construction and industrial applications. Our ERW pipes are manufactured according to international standards including ASTM, API 5L, EN, JIS and GOST, with options for different sizes, wall thicknesses, coatings and inspection requirements based on project needs.
The advantages of ERW pipe:
There are no fusion metals used during the manufacturing process. This means that the pipe is extremely strong and durable.
The weld seam cannot be seen or felt. This is a major difference when looking at the double submerged arc welding process, which creates an obvious welded bead that might need to be eliminated.
With the advances in high-frequency electric currents for welding, the process is far easier and safer.
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ERW Pipe Description
ERW steel pipes are manufactured by low-frequency or high-frequency resistance “resistance”. They are round pipes welded from steel plates with longitudinal welds. It is used to transport oil, natural gas and other vapor-liquid objects, and can meet various requirements of high and low pressure. At present, it occupies a pivotal position in the field of transportation pipes in the world.
During ERW pipe welding, heat is generated when current flows through the contact surface of the welding area. It heats the two edges of the steel to the point where one edge can form a bond. At the same time, under the action of the combined pressure, the edges of the tube blank melt and squeeze together.
Typically the maximum outside diameter of ERW tubing is 24″, and as a specialty manufacturer, baolai can go up to 26″.
ERW Pipe Applications and Advantages
Application
Mostly used for transporting water, oil, natural gas, etc.
It is also used in oil and gas fields, automotive industry, etc.
It is also used in oil and gas fields, automotive industry, etc.
Advantage
High efficiency, low cost,
material saving, easy to automate.
material saving, easy to automate.
Services we offer
Baolai Group provides all processing services for customers so that customers can cut costs in their projects.
The services we can provide include steel pipe protective coating (FBE, 2PE, 3PE, 3PP, Hot Dipped Galvanized, Painted, Oiled), steel pipe deep processing (beveling, threading, grooving, plaining end, cutting, marking, bending, welding, punching), as well as packaging and delivery.
Water Cutting
Water jet technology, also known as water jet and water cutting technology, is a real cold cutting. speed jet water cutting.
Beveling
We can apply any type of Bevel to any degree desired. Beveling can be applied to the surface of pipes of any size or diameter.
Threaded
Pipe thread is a thread located on the pipe wall for connection, mainly used for the sealing connection of water, gas, oil and other pipelines. We offer NPT* and BSPT* pipe threads.
FAQ
1: What is ERW pipe and how is it manufactured?
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ERW (Electric Resistance Welded) pipe is produced by continuously rolling steel coil or plate into a tubular shape, then welding the longitudinal seam using high-frequency electric resistance — no filler material is required. The heat generated by the electrical current melts the two edges of the steel together, which are then fused under mechanical pressure to form a clean, uniform weld seam. As a dedicated ERW pipe manufacturer, Baolai Steel produces ERW pipes with outside diameters up to 26″, exceeding the standard industry maximum of 24″.
2: What are the main applications of ERW steel pipe?
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ERW steel pipes are widely used across heavy industries due to their consistent dimensions and cost-efficient production process. Key application areas include: Oil & gas transportation — conveying oil, natural gas, and other vapor-liquid substances under high and low pressure Automotive manufacturing — structural and mechanical tubing components Construction & infrastructure — structural columns, scaffolding, and support frameworks Water supply & drainage — municipal pipeline systems Mechanical engineering — precision drive shafts, rollers, and bearing sleeves ERW carbon steel pipe is currently one of the most widely used pipe types in global transportation pipeline networks.
3: What is the difference between ERW pipe and seamless pipe?
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ERW pipe is formed from rolled steel plate and welded along a longitudinal seam, making it more cost-effective and faster to produce — ideal for large-volume B2B procurement. Seamless pipe is extruded from a solid billet with no weld seam, offering higher pressure resistance and uniformity, but at a significantly higher cost and longer lead time. For most oil & gas transmission, structural, and mechanical applications with standard pressure requirements, ERW carbon steel pipe delivers equivalent performance at a lower total cost.
4: What size range and wall thickness is available for ERW carbon steel pipe?
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Our ERW steel pipes cover a wide dimensional range to meet diverse B2B project requirements: Outside diameter: 21.3 mm – 660 mm (up to 26″, exceeding the standard industry limit) Wall thickness: 1.8 mm – 25.4 mm Length: Standard 6 m / 12 m, or custom-cut to project specifications Standards: API 5L, ASTM A53, ASTM A135, and customer-specified grades For projects in the Middle East, Southeast Asia, Eastern Europe, and Australia, we provide full documentation including mill test reports (MTR), third-party inspection certificates, and COC as required by destination-country import regulations.
5: How do I choose between ERW pipe and LSAW pipe for my pipeline project?
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Both ERW and LSAW are welded steel pipes, but they serve different project scales and pressure requirements. ERW pipe covers small to medium diameters (up to 26″) with standard wall thickness, making it the more economical and faster-to-deliver option — best suited for oil and gas distribution lines, structural frameworks, and mechanical applications. LSAW pipe, by contrast, is designed for large-diameter, thick-wall, high-pressure mainline transmission projects such as offshore piling and long-distance cross-country pipelines, where higher material cost is justified by performance demands. For most mid-scale procurement needs, ERW pipe offers the optimal balance of strength, dimensional consistency, and cost efficiency. Our technical team can advise on the right specification for your specific project — contact us for a free consultation.
