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The biggest difference between ERW pipe and seamless steel pipe is that ERW pipe has welding line, which is the same as welded steel pipe, but seamless black steel pipe doesnt have, either does the welded steel pipe. Furthermore, the welding line of ERW pipe is the key to the quality of ERW steel pipe.A53 Seamless & Welded (ERW) Steel Pipe ASTM A53 Number of Tests Seamless and Electric Resistance Weld (ERW) bending, flattening, tensile on one length of pipe from each lot of 500 lengths, or less, of each pipe size. Permissible Variations for A53 steel pipe. Wall thickness The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.

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Steel Pipe, Steel Tube, ERW Steel Pipe manufacturer supplier in China, offering X42 X46 X52 X56 X60 API 5L Gr. B ERW Steel Pipe, Hot Sale Welded ERW Steel Pipe Tube, Black Steel Pipe (ASTM, GB, EN, API) and so on.ERW-welded-steel-pipes in Libya - GBLSTEELERW-welded-steel-pipes in Libya exporter from China, we're probably the most experienced supplier from USA with ISO9001 Certification. Also the items have been certified by mutiple security certification.We will provide our ERW-welded-steel-pipes in Libya priducts in top-quality and most favourable value.. ERW Welded Steel Pipe Hollow SectionHigh Quality Galvanized Square And Rectangular Steel Pipes hot sale high quality erw mild steel pipe black steel pipeTianjin Credit Import and Export Trading Co., Ltd was established in 2010, which belongs to CREDIT STEEL INDUSTRIAL CO., LIMITED ; the main products of the company are ERW pipe, galvanized pipe, square & rectangular tube, seamless pipe, SSAW steel pipe, LSAW steel pipe, and a serious of metal products; products are widely used.

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