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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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Five-point characteristics for judging non-metallic inclusions in rectangular tubes-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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Five-point characteristics for judging non-metallic inclusions in rectangular tubes
Five-point characteristics for judging non-metallic inclusions in rectangular tubes

Although the content of non-metallic inclusions in the square tube is small, it has a great influence on the performance of the tube, so the detection of non-metallic inclusions has become one of the important items in the production process. A correct understanding of the source, composition, form, hazard principle, distribution, and microscopic characteristics of inclusions is of great significance for controlling or reducing the content of inclusions in square tubes and improving quality.


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The following characteristics can be used to determine the category of non-metallic inclusions in rectangular tubes:

(1) Alumina: most of them are undeformed, angular, and have small black or bluish particles, arranged in a row along the rolling direction, and have at least three particles.

(2) Spherical oxides: non-deformed, angular or round, black or bluish in shape, irregularly distributed particles.

(3) Single-particle spherical type: round or nearly round, single-particle inclusions with a diameter ≥ 13 μm.

(4) Sulfides: single gray inclusions with high ductility and a wide range of shape ratios, and generally end rounded corners in square rectangular tube materials.

(5) Silicate: with high ductility, a single black or dark gray inclusion with a wide range of aspect ratios, generally with an acute angle at the end.

The evaluation of the traditional type of inclusions can also be done by comparing its shape with the above five types of inclusions and indicating its chemical characteristics. The evaluation of deposits such as borides, carbides, carbonitrides or nitrides in square rectangular tubes can also be compared with the above five types of inclusions according to their morphology, and their chemical characteristics are expressed according to the above methods.