What Is ERW(Electric Resistance Welded) Steel Pipe

ERW pipes are divided into two forms: AC welding and DC welding. High-frequency welding is mainly used to produce thin-walled and normal-walled steel pipes. ERW pipes are an oil and gas storage and utilization pipe with advanced performance, leading quality, and high cost performance. It is an ideal choice for most mechanical processing. The ERW material of the fully formed finished ERW pipe is between welded steel pipes and seamless pipes. Because of this, it is smoother and has a more consistent surface texture, so there is no obvious weld. The surface of the ERW steel pipe is uncoated, the color is semi-smooth dark gray, and the weld is located on the inside. ERW pipes are generally used as wire casings in the power industry. Performance characteristics: 100% ultrasonic testing of the parent material to ensure the intrinsic quality of the pipe body; no uncoiling-reel shearing process, pitting of the parent material, and few scratches; the finished pipe has basically no residual stress after stress relief; the weld is short and the probability of defects is small; it can transport wet and sour natural gas if conditions permit; the geometric size accuracy of the steel pipe after expansion is high; welding is carried out in a straight line in a horizontal position after the forming is completed, so the misalignment, seams, pipe diameter, and circumference are well controlled, and the welding quality is excellent. The main products are divided into three categories: two straight seam steel pipe production lines, product specifications 114.3mm-508mm, wall thickness 3.58mm-16.3mm. Ten spiral pipe production lines, product specifications 219.1mm-3000mm, wall thickness 5mm-30mm. Two oil casing production lines for petroleum, product specifications 60.32mm-508mm, wall thickness 4.24mm-16.3mm. It is equipped with two anti-corrosion and thermal insulation production lines. The products can comply with the latest international standards such as API 5L, API 5CT, ASTM, EN10219-2, GB/T9711, 3091-20081, 3793-2008, 14291-2006, etc. The product steel grades include GRB, X42, X52, X60, X65, X70, J55, K55, N80, L80, P110, etc. The products are widely used in petroleum, natural gas, coal gas, coal mine, machinery, electric power, piling and other purposes.

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