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Tianjin Yuantai Derun Pipe Manufacturing Group Co., Ltd., established in March 2002, is the biggest manufacturer specializing in  ERW square&rectangular tube/pipe, hollow section structure pipe, galvanized pipe and spiral welding pipe in China. Annual output reaches 5 million tons.Yuantai Derun has 59 production lines of black ERW pipe, 10 production lines of galvanized pipe and 3 production lines of spiral welding pipe. Square pipe from 20*20*1mm to 500*500*40mm, rectangular pipe from 20*30*1.2mm to 400*600*40mm,  welded pipe from 2”—60” can be manufactured. Yuantai Derun can manufacture square rectangular pipes as per the standards of ASTM A500, JIS G3466, EN10219, DIN2240, BS1387, AS1163.

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January 1993

Key team members of Yuantai Derun group began technical job in Tianjin Daqiuzhuang tube factory.

June 2002

Tianjin Yuantai Industry & Trade Co., Ltd. was founded, specialize in square, rectangular hollow steel pipe, hot galvanized welded (hot dip galvanized) square tube, the registered capital is USD 10 million.

May 2004

One of Yuantai subsidiaries Tangshan Lituo Steel Tube Co., Ltd. was established, specialize in square rectangular straight welded hollow steel pipe, registered capital is USD 10 million.

April 2005

Yuantai Steel Square Pipe Co. Ltd. was established, specialize in square welding hollow steel tube and galvanized tube, the registered is USD 2 million.

March 2010

Tianjin Yuantai Runxiang commercial trade company was established, specialize in strip steel trade, galvanized pipe agent, etc., the registered capital is USD 2 million.

March 2010

Tianjin Yuantai Derun pipe manufacturing group Co. Ltd. was formally established, marking that the production of high-frequency welded black, galvanized square pipe, spiral welded pipe, pipe logistics and pipe trade as one of the large-scale joint enterprise Yuantai Derun group was formally established, the group registered capital is USD 20 million.

March 2010

Tianjin Yuantai Derun Investment Co., Ltd. was formally established, specialize in steel pipe industry chain,lower industry mergers and acquisitions and industrial real estate development, the registered capital is USD 2 million.

August 2013

Tianjin Derun Runfeng pipe manufacturing Co. Ltd was established, specialize in hot galvanized (hot galvanizing) processing business, the registered capital is USD 8 million.

March 2015

Tianjin Yuantai Yuanda anti-corrosion insulation pipe Co., Ltd. was established, specialize in spiral welded pipe production and sales, the registered capital is USD 2 million.

August 2015

Tangshan Yuantai Derun Pipe Co., Ltd. was established, specialize in steel strip, steel pipe trade, registered capital is USD 1 million.

March 2016

Tianjin Yuantai Derun International Trade Co., Ltd was established,mainly engaged in international import and export business for Yuantai Group, registered capital is USD 2 million.

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The principle of ERW high frequency welded steel pipe making-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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The principle of ERW high frequency welded steel pipe making
The principle of ERW high frequency welded steel pipe making

ERW straight seam steel pipe is made by using the skin effect of high-frequency current to heat the edge of the formed pipe billet to the welding temperature quickly and then extrude and weld it. According to different feeding methods, ERW welded pipes can be divided into high-frequency contact welding and high-frequency induction welding. Both of them use the skin effect and proximity effect of high-frequency current, and at the same time, they are pressure-welded into steel pipes under the action of extrusion rollers.


ERW pipe ASTM.jpg


ERW contact welding straight seam steel pipe uses two electrodes or welding feet to contact the two edges of the formed tube respectively. The skin effect and proximity effect generated by high-frequency current are used to concentrate the welding current on the V-shaped notch, and the V-shaped notch The metal at the place is instantly heated to the welding temperature, and at the same time, the steel pipe is welded by pressing the extrusion roller; ERW induction welding is to first form the hot-rolled coil through the forming machine into a tube, when the tube passes through the induction coil (high frequency The induction coil of the welding machine generates a high-frequency magnetic field through the high-frequency current), and the high-frequency induced eddy current will be generated in the tube, and then the skin effect and the proximity effect of the high-frequency eddy current will be used to make the eddy current dense at the edge of the tube The V-shaped notch, the formed tube blank is quickly heated to the welding temperature due to its own resistance, and at the same time, it is pressure-welded into a steel pipe under the extrusion of the extrusion roller.