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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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Key points of operation for sintering and ignition of square rectangular tube-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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Key points of operation for sintering and ignition of square rectangular tube
Key points of operation for sintering and ignition of square rectangular tube

1. The typical igniting time of square rectangular tube is 60 seconds. If the ignition period is too short, the solid fuel on the surface will not be properly ignited, and drawing down the fuel belt on the surface of the square tube will be problematic, affecting normal sintering.

2. The sintering exhaust negative pressure of square rectangular tube is 50-60% of the typical ignition negative pressure. The value of the negative pressure of the sintering draft can be used to control the operation of the granulation and distribution process in production, allowing the degree of granulation of the mixture and the air permeability of the material layer to be assessed.

3. The usual ignition temperature of square rectangular tube is between 1050 and 1150°C. If the ignition temperature is too low, the solid fuel on the surface of the square tube will be difficult to ignite, and the surface will become semi-molten after ignition.

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4. It should be noted that a good ignition produces the best sintering ignition, specifically: the temperature distribution of the ignition surface of the entire trolley is uniform, the ignition high-temperature combustion products enter the material layer smoothly, and there is no reflection phenomenon. After the trolley has passed through the igniter, The red surface fades quickly, and the surface material surface is blue or blue-black and not under-fused or crusted.

5. The sintering ignition negative pressure is generally classified into four states: low negative pressure, too low negative pressure, medium negative pressure, and high negative pressure. The low negative pressure ignition effect is the best among them, and the other three states will influence sintering output and power consumption. The high negative pressure ignition effect has the greatest influence on the square rectangular tube.