5 Advantages of ERW Steel Pipe - APL Apollo

Are you looking for the best steel pipes for your project? You have recently heard about ERW steel pipes that can help you meet high and low-pressure requirements. These rounded steel pipes are mostly used for oil, natural gas, and other vapour-liquid transportation. Therefore, other engineering applications can also use these round structural steel pipes for fencing, scaffolding, line pipes, etc.

No doubt, it has become more popular in the transportation pipe & construction tube industry. Learn how ERW steel pipes are manufactured and the advantages of using them.

What is ERW Steel Pipe?
Electrical Resistance Welded ( ERW) Structural Steel Pipe is made of carbon steel coil, which has low strength and hardness properties. Also, the durability is increased by the weld seam that runs parallel to the pipe.

At APL Apollo, ERW structural steel pipes and tubes are manufactured by transforming cold flat steel strips into rounded tubes and passing them through a set of forming rollers to produce a longitudinal seam. The two edges of a seam are heated with a high-frequency resistance and pressed together to form a bond.

No metal filling will be needed for the longitudinal ERW as impurities in the heat zone are extruded during the welding process. Thus, this process makes electro-welded steel pipe more durable.

Five Key Advantages of Apollo ERW Steel Pipes
Steel ERW pipes are formed from hot rolled steel plates through repeated shaping, bending, welding, heat treatment, sizing, straightening, cutting, and heat treatment.

1) High dimensional accuracy: Electrical-resistance welded pipes are rounded pipes with a small diameter and thin width of the wall. It is made with high-frequency induction welding to achieve accurate dimensions.

2) Good mechanical properties: Manufacturers can control the strip rolling of ERW steel pipe effortlessly because of its innovative welding technology. ERW Steel pipes can be rolled effortlessly because of its innovative welding technology, which enables manufacturers to control the strip rolling process. The welded part is also passed through online heat treatment technology to improve its performance. Hence, it helps to reduce material wastage.

3) Higher Elongation: Straight seam welded steel pipe can elongate 8% -10% higher than traditional seamless steel pipes. Besides, an electric-welded steel pipe consumes less carbon than other steel tubes and pipes.

4)Uniform wall thickness: ERW steel pipe has high concentricity and uniform thickness after heat treatment. Its microstructure makes the steel pipe more durable and resistant to collapse. Also, it offers higher elongation compared to other seamless steel pipes.

5) Longitudinal resistance: Welded steel tubes undergo rigorous heat treatment to ensure their durability. It will not collapse during transit and can provide high resistance to all external forces. This is why it can be used to manufacture small diameter thin-walled pipes, commonly used in the city to transport gas and crude oil.

Summing Up! Only the best ERW steel pipes will offer you all the advantages mentioned in the list. APL Apollo manufactures structural steel pipes and tubes with higher resistance to heat and temperature. They are easy to install and have a long service life. Click here to know more.

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Straight seam welded steel pipes are divided into high frequency resistance welding and submerged arc welding according to the welding process. Straight seam submerged arc welding is referred to as LSAW, and longitudinal high frequency resistance welding is referred to as ERW.

Compared with submerged arc welding, high frequency electric resistance welded steel pipes (ERW steel pipes) do not add any welding materials during the welding process in the ERW process, and the weld formation does not undergo a thermal melting state, but the weld metal undergoes a recrystallization process. Therefore, the formed weld seam is completely consistent with the chemical composition of the base metal. After the steel pipe is welded, it is annealed to produce the cold working internal stress and welding internal stress. Therefore, the comprehensive mechanical properties of the ERW steel pipe are better.

LSAW steel pipes (UOE) adopt the post-weld cold expansion process to expand the pipes, so the geometric dimensions of LSAW steel pipes are more accurate, and the matching quality when using LSAW steel pipes is good to ensure the quality of welding. Eliminate part of the internal stress. In addition, LSAW steel pipes are welded with multi-wire welding (three-wire, four-wire), and the heat input generated by this welding process is small, the degree of influence on the heat affected zone of the base metal is also small. After multi-wire welding, the welding wire of the first pass can eliminate the stress generated during welding, thereby improving the mechanical properties of the steel pipe. The base material can achieve 100% ultrasonic flaw detection of steel plates one by one to meet the requirements of high-pressure pipelines for base materials. However, although the overall performance of LSAW steel pipe is better than other steel pipes, its high price discourages users with tight funds.

1. The difference between raw materials and production capacity
The raw material of ERW steel pipe is hot rolled steel coil, and the raw material of LSAW steel pipe is hot rolled steel plate. Therefore, ERW steel pipe can realize continuous assembly line operation with high production efficiency and low production cost; while SAW steel pipe is processed by steel plate, continuous assembly line operation cannot be realized, and the production efficiency is low, and the production cost is high. ERW steel pipe is limited by the thickness of the steel coil. Generally, the maximum thickness that can be produced is 25mm, and the maximum diameter that can be produced is 660mm; while the maximum thickness that can be produced for LSAW steel pipe is 40mm, the maximum diameter that can be produced is only limited by the width of the steel plate. The maximum production diameter is mm.

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LSAW steel pipes can be divided into different forming methods:
UOE steel pipe: After the single steel plate is pre-bent at the edge, it undergoes U forming, O forming, internal welding, external welding, mechanical cold expansion and other processes.
JCOE steel pipe: according to "J-C-O-E" pre-welding, forming, and cold expanding after welding
HME steel pipe: It is formed by mandrel rolling method according to "C-C-O", welded and then cold-expanded.

2. The difference in welding
ERW steel pipe welding does not need to add welding wire; LSAW steel pipe requires welding wire.

3. The difference in appearance
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.

4. The difference between purchase cost and difficulty
The purchase cost of ERW steel pipe is low, and the cost of LSAW steel pipe is very high, and the general price difference is 15%-25%.
There are few domestic LSAW steel pipe manufacturers and it is difficult to purchase. When the diameter

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