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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 is the difference between seamless square tube and welded square tube?-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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What is the difference between seamless square tube and welded square tube?
What is the difference between seamless square tube and welded square tube?

A seamless square tube is a square-shaped steel pipe with no seams around the circumference. It is made by cold-drawing and extruding seamless steel tubes and is widely used in mechanical structures and fluid transportation fields. Seamless steel pipes have a hollow cross-section and no seam around the circumference. Square tubes are formed by extruding seamless pipes through a mold on all four sides, which is why they are called seamless steel pipes.

Seamless square tubes are made from steel ingots or solid pipe blanks, which are pierced to make rough tubes, and then hot-rolled, cold-rolled, or cold-drawn to make the final product.


seamless carbon steel tube1.jpg


The main differences between seamless and welded square tubes are:

1. Different manufacturing processes:

Seamless square tubes are made by cold-drawing seamless steel tubes. Welded square tubes, on the other hand, are made by welding steel plates or steel strips together.

2. Price differences:

Seamless square tubes are usually more expensive than welded square tubes of the same brand and specifications.

3. Performance differences:

During the welding process of the welded square tube, high temperature affects the structure of the metal, which makes its mechanical properties less stable than that of seamless square tubes.

4. Different applications:

Welded square tubes are mainly used in construction, mechanical manufacturing, steel construction projects, shipbuilding, solar power bracket fabrication, steel structure engineering, power engineering, power plants, agriculture and chemical machinery, glass curtain walls, automobile chassis, airports, boiler construction, high-speed road guardrails, and housing construction applications. Seamless square tubes are mainly used in liquid transportation, hydraulic brackets, mechanical structures, medium and low-pressure and high-pressure boiler tubes, heat exchanger tubes, gas, petroleum, and other industries.