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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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What measures are there to protect the quality of galvanized steel pipes during welding?-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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What measures are there to protect the quality of galvanized steel pipes during welding?
What measures are there to protect the quality of galvanized steel pipes during welding?

There are five main aspects to ensure the safeguard measures for steel pipe welding. If these five aspects are guaranteed, the quality of galvanized steel pipes can also be guaranteed.

The first is people, and the human factor is the focus of welding control. Therefore, before welding, skilled welders with welder certificates should be selected for necessary technical training and disclosure. It is not allowed to be replaced at will to ensure that the welders who weld the pipeline are relatively stable.

The second is the control of welding consumables, ensuring that the purchased welding consumables are from regular channels, have quality assurance certificates, certificates of conformity, and meet the process requirements; the recycling of welding rod heads is strictly controlled to ensure the flow direction and dosage; welding consumables must be baked strictly according to the process, And distribute no more than half a day's dosage at a time.


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The third is the welding machine of galvanized steel pipes. The welding machine must ensure reliable performance and meet the requirements of the process; the welding machine must have a current and voltage meter that has passed the verification to ensure the correct implementation of the welding process. The welding cable should not be too long, and the welding parameters should be adjusted if it is longer.

The fourth is the welding process method to ensure the strict implementation of the special operation method of the galvanized steel pipes. The welding process shall be inspected before welding, the parameters of the welding process and the operation method shall be controlled, the appearance quality shall be inspected after welding, and non-destructive testing after welding shall be added if necessary. Control the welding level and the number of welding consumables for each pass.

The fifth is welding environment control to ensure that the temperature, humidity, and wind speed during welding meets the process requirements.