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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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Production Technology of Large Diameter Welded Pipe-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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Production Technology of Large Diameter Welded Pipe
Production Technology of Large Diameter Welded Pipe

The production process of large-diameter welded pipe is mainly divided into the following types:

1. Large-diameter spiral steel pipe, also known as (large-diameter spiral welded pipe, large-diameter submerged arc welded spiral pipe, large-diameter spiral pipe, or double-sided submerged arc welded spiral steel pipe), is mainly based on hot-rolled steel coils as raw materials. Spiral-wound welded steel pipes are called spiral welded steel pipes because their welds are helical. The process is mainly submerged arc welding process.

2. Large diameter straight seam steel pipe, also known as (large diameter straight seam welded pipe, large diameter straight seam pipe, large diameter welded steel pipe, large diameter welded pipe, double-sided submerged arc welded straight seam steel pipe, high frequency welded pipe) is mainly made of hot rolled steel coil, and medium and thick plates as raw materials, the process of rolling and welding, because the weld is one or two straight seams, so it is called straight seam steel pipe.


Large Diameter Welded Pipe.jpg


The process is divided into two types: the first type: is a double-sided submerged arc welding process, mainly large-diameter thick-walled welded pipes. The second is the high-frequency welding process, which is mainly based on small-diameter thin-walled welded pipes. The heat-expanded seamless process is also performed on the basis of high-frequency welded pipes.

3. Large-diameter coiled pipe, the coiled pipe is also called (T-shaped welded pipe, steel plate coiled pipe, thick-walled coiled pipe, steel plate reel, or steel plate coiled circle) mainly uses medium and thick plates as raw materials, and is rolled by a coiling machine. In the process of round calibration and submerged arc welding, because its welding shape is like a T-shaped pipe, it is also called a T-shaped welded pipe. Its advantages are mainly large-diameter thick-walled models, flexible materials, and flexible docking according to the length of the customer. All applications are very convenient.