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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 are the advantages of heat treatment for square tubes?-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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What are the advantages of heat treatment for square tubes?
What are the advantages of heat treatment for square tubes?

(1) The reliability of high-precision square pipe specifications stipulates that the precision of pipe fittings should be maintained for a long time. Due to the low cooling rate and straightening in the air, it has a smooth effect and increases the number of residual square tubes in the structure, so it is necessary to carry out cold violence.


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(2) Due to the slenderness of the rectangular tube, reducing heat treatment deformation is easy to deform, and the deformation must be strictly controlled during the heat treatment process. The heat treatment process is a very important whole process. In the process of heat treatment and refrigeration, the use of cold plastic deformation for direct calibration is an important factor to ensure the improvement of the compliance rate. Therefore, heat treatment in a hot bath or heat treatment in oil should be carried out. The substance is refrigerated for a certain period of time, proposing a thermal calibration.

At the same time, suspension heating should be carried out during the heating process to reduce heat treatment deformation. For high-precision slide rails, gas high-frequency quenching or low-temperature plasma high-frequency quenching should be carried out to reduce deformation.

(3) High-toughness square tubes are mainly affected by contact fatigue loads, so they must have high toughness. Therefore, heat treatment, induction hardening, or organic chemical heat treatment should be carried out, followed by low-temperature quenching.