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How much do you Know About ERW Steel Pipe?

Feb. 08, 2020

"ERW Steel Pipe" is Electric Resistance Welding, abbreviated as ERW. It is used to transport vapor and liquid objects such as oil and natural gas. It can meet various requirements of high and low pressure. It currently plays a pivotal role in the field of transmission pipes in the world.

1. Welded pipes are round pipes made of steel plates, divided into high-frequency resistance welded pipes (ERW welded pipes), straight seam welded pipes (LSAW), and spiral welded pipes.

2. The line pipe is also a wire tube, which is relatively thin. It is indicated by "T" and can only be used as a pipe.

3. The ERW pipe is a "high-frequency resistance welded steel pipe", which is different from the ordinary welding pipe welding process. The welding seam is made by melting the base metal of the steel strip body, and the mechanical strength is better than that of the ordinary welded pipe.

JIS G3456 ERW Steel Pipe

JIS G3456 ERW Steel Pipe

As an ERW Steel Pipe Supplier, share with you.

ERW stands for resistance welding. Resistance welding has the characteristics of high production efficiency, low cost, material saving, and easy automation. Therefore, it is widely used in various industrial sectors such as aviation, aerospace, energy, electronics, automotive, and light industry. It is an important welding process. One.

The biggest difference between ERW steel pipe and seamless steel pipe is that ERW has a weld seam, which is the key to the quality of ERW steel pipe. Modern ERW steel pipe production technology and equipment, some people divide the seamless ERW steel pipe into geometric seamless and physical seamless. Geometric seamless is to remove the internal and external burrs of the ERW steel pipe. Due to the continuous improvement and improvement of the structure of the internal burr removal system and the cutter, the removal of internal burrs in steel pipes of large and medium diameters has been better treated. The internal burr can be controlled from -0.2mm to 0.5mm. Physical seamless means that there is a difference between the metallographic structure inside the weld and the base metal, which causes the mechanical properties of the weld area to decrease, and measures need to be taken to make it uniform and consistent. The high-frequency welding thermal process of ERW steel pipe caused the temperature distribution gradient near the edge of the tube blank, and formed characteristic regions such as melting zone, semi-melting zone, overheating structure, normalizing zone, incomplete normalizing zone, and tempering zone. The microstructure in the superheated zone has a sharp austenite grain growth due to the welding temperature above 1000ºC, and a hard and brittle coarse crystal phase will be formed under cooling conditions. In addition, the existence of a temperature gradient will generate welding stress. In this way, a situation where the mechanical properties of the weld area are lower than the base material is formed. The physical seamlessness is to heat the weld area AC3 (927 ° C) by using an intermediate frequency induction heating device through a conventional heat treatment process of the weld seam, and then perform a length of 60 m The air cooling process with a speed of 20m / min, and water cooling when needed. The use of this method has achieved the purpose of eliminating stress, softening and refining the structure, and improving the comprehensive mechanical properties of the welding heat affected zone.

Our company also has JIS G3456 ERW Steel Pipe on sale, welcome to consult.

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