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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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Classification of steel specifications-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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Classification of steel specifications
Classification of steel specifications

Steel products are widely used and have various varieties. Different standards refer to different types of steel products. There are seven main categories:

1. Classified by quality

(1) Ordinary steel (P≤0.045%, S≤0.050%) 

(2) High-quality steel (both P and S≤0.035%) 

(3) High quality steel (P≤0.035%, S≤0.030%) 

2. Classified by chemical composition

(1) Carbon steel: low carbon steel (C≤0.25%); medium carbon steel (C≤0.25-0.60%); high carbon steel (C≥0.60%). 

(2) Alloy steel: low alloy steel (total content of alloy elements ≤ 5%); medium alloy steel (total content of alloy elements > 5-10%); high alloy steel (total content of alloy elements > 10%). 


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3. Classified by forming method:

(1) Forged steel (2) Cast steel (3) Hot rolled steel (4) Cold drawn steel. 

4. Classification according to metallographic structure

(1) Annealed state: hypoeutectoid steel (ferrite + pearlite); eutectoid steel (pearlite); hypereutectoid steel (pearlite + cementite); ledeburite steel (pearlite + cementite) carbon body)

(2) Normalized state: pearlitic steel; bainite steel; martensitic steel; austenitic steel. 

(3) No phase change or partial phase change. 

5. Classification by purpose

(1) Construction and engineering steel: ordinary carbon structural steel; low alloy structural steel; reinforced steel.

(2) Structural steel

(3) Tool steel: carbon tool steel; alloy tool steel; high-speed tool steel.

(4) Special performance steel: stainless acid-resistant steel; heat-resistant steel: including oxidation-resistant steel, heat-strength steel, valve steel; electric heating alloy steel; wear-resistant steel; low-temperature steel; electrical steel. 

(5) Steel for professional use: such as steel for bridges, steel for ships, steel for boilers, steel for pressure vessels, steel for agricultural machinery, etc. 

6. Comprehensive classification:

(1) Ordinary steel

(2) High-quality steel (including high-grade high-quality steel)

7. Classified by smelting method

(1) According to furnace types: a. Open hearth furnace steel b. Converter steel c. Electric furnace steel

(2) According to deoxidation: boiling steel; semi-killed steel; killed steel; special killed steel.