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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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How to classify welded steel pipe?-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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How to classify welded steel pipe?
How to classify welded steel pipe?

There are many ways to classify pipes. According to the material, they can be divided into metal pipes, non-metal pipes, and steel-lined non-metal composite pipes.

Non-metal pipes mainly include rubber pipes, plastic pipes, asbestos cement pipes, graphite pipes, fiberglass pipes, etc. The proportion of non-metal pipes used is relatively small compared to metal pipes, while metal pipes account for more than 85% of all process pipeline installation projects in most petrochemical plants.

The following focuses on welded steel pipes. Welded steel pipes, also known as seamed steel pipes, are generally made of steel plates or steel strips.


How to classify welded steel pipe.jpg


1. According to the surface treatment form of the pipe: divided into galvanized and non-galvanized. The galvanized surface is white, also known as white iron pipe or galvanized steel pipe; the surface is not galvanized, that is, ordinary welded steel pipe, also known as black iron pipe. Galvanized welded steel pipes are often used for pipelines that require relatively clean media, such as domestic water, purified air, instrument air, etc.; non-galvanized welded steel pipes can be used to transport steam, gas, compressed air condensed water, etc.

2. According to user requirements, welded steel pipes can be divided into two types when leaving the factory: one is with threads on the pipe end, and the other is without threads on the pipe end. The length of each welded steel pipe with threads on the pipe end is 4 to 9 meters, and the length of each welded steel pipe without threads is 4 to 12 meters.

3. Welded steel pipes are divided into thin-walled steel pipes, thickened steel pipes, and ordinary steel pipes according to the thickness of the pipe wall. Ordinary steel pipes are the most used in process pipelines, and their test pressure is 2.0MPa. The test pressure of thickened steel pipes is 3.0MPa.

4. There are many connection methods for welded steel pipes: threaded connection, flange connection, and welding. Flange connection is divided into threaded flange connection and welded flange connection, and welding methods are divided into gas welding and arc welding.

5. The specification range of commonly used welded steel pipes: nominal diameter 6 to 150mm.