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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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Steel grating weight calculator-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
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Steel grating weight calculator
Steel grating weight calculator

WEIGHT OF GRATINGS: 

The weight of grating refers to the theoretical weight of grating that has been end welded and surface treated, except for the one that has not been surface treated. The actual weight and theoretical weight will differ due to the differences in end welding, opening, and notch cutting.

When estimating the self-weight of gratings to be used for industrial platforms, as well as for delivery and pavment, the theoretical weight must be employed. The weight per square meter of grating must be estimated using the formula:

Wt=(b 1 t 1:N 1:+b 2 t 2 N 2 +2b 3 t 3) ρ μ x 10 -6


steel grating for walkways1.jpg


Wt—the weight of grating, kg/m 2

t1 —the width of the bearing bar, mm

b1 —the thickness of the bearing bar, mm

N1 —the number of bearing bars per meter of grating,

t2 —the width of the crossbar, mm

b2 —the thickness of the crossbar, mm

N2 —the number of cross bars per meter of the grating;

t3 —the width of the end flat bar, mm

b3 —the thickness of the end flat bar, mm

p—the density of the material, kg/m 3, the density of steel products are calculated as 7850kg/m 3 ;

u—weight increasing coefficient due to surface treatment, the coefficient of hot dip galvanizing and painting shall be calculated as 1.06.


1. The weight of the stair tread is calculated as per its theoretical weight, and the weight-increasing coefficient of hot dip galvanizing and painting is 1.06.

2. For other gratings that need special treatment, the weight should be calculated otherwise.