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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 forming method of special shaped steel pipes-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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The forming method of special shaped steel pipes
The forming method of special shaped steel pipes

Special-shaped steel pipes, special-shaped steel pipes are bent and formed, this forming method is what we commonly call bending. There are two types of bending of special-shaped steel pipes, one is real bending and the other is empty bending.

The real curved square tube is compacted, and then the curved, internal and external roller tubes are compacted on the inner and outer walls of the special-shaped steel pipe, which is a two-way process. The advantage of the real bending of the rectangular tube is that the bending of the solid will be relatively small, and it will form a more accurate, and in production time, as long as the roll type is used accurately, and the shape of the steel tube after the internal rebound is more accurate The angle of the steel pipe, we can guarantee the accuracy.


Special shaped steel pipe factory.jpg


There are certain disadvantages of instant bending, the main stretching time will cause the steel pipe to become thinner, the real bending will make the rectangular pipe bend, and the stretching and bending of agricultural products will cause the length of the bending line in the length direction of the special-shaped steel pipe to be shortened, and the metal content will be due to Stretch thinning.

Empty bent rectangular tube production, external rollers with square and special-shaped steel tubes on the outer wall of the tube, individual with metal bending, empty bending time, steel tube bending line will produce a certain compression, so the compression effect, the zigzag line of longitudinal variable length, a rectangular tube of bent metal, will become thicker with air bending, compressing or thickening the effect.

These two production methods, two basic methods of rectangular pipe production square and special-shaped steel pipe forming, according to the needs of different products, choose the appropriate process configuration. It should be noted that when stretched and compressed, the quality of the product will be affected, or the deformation of the square rectangular tube will be caused.