SQUARE AND RECTANGULAR HWS ENTERPRISE
ENTERS INTO CHINA TOP 500
MANUFACTURING ENTERPRISE

about us

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.

Learn More >>
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.

news

EXCEED EXCELLENT INNOVATION

Integrity

Rely on faith and trust to be achievement, make friends and be on the way all the time.

Innovation

Be low key but ambitious, look forward to the Era of Smart Production with intelligence, information and precision

Development

Create a century brand by the way of forging ahead and pursuing excellence

Dedication

Realize our vision and task, be valuable and feedback.

Nine connection methods of square and rectangular tubes-news-TIANJIN YUANTAI DERUN PIPE MANUFACTURING GROUP CO., LTD-
news

Home >> news

Nine connection methods of square and rectangular tubes
Nine connection methods of square and rectangular tubes

(1) Compression

Insert the square tube into the nozzle, fasten it with a nut, and use the screw force to compress the casing at the nozzle part through the sealing ring to play a sealing role and complete the connection of the square tube.

(2) Quick connect flange type

Ring-shaped argon arc welding is carried out on the flange and the matching, and the gasket between the flanges is compressed with a quick clamp to play a sealing role to complete the matching connection.


ASTM A501 grade b equivalent material.jpg


(3) Limit compression type

The rectangular tube adopts a flanging or port welding ring, and the connection method is a union or semi-union connection. After compressing the limit seal of the rubber sealing ring by 20%-30%, it enters the metal sealing groove and uses the limit seal to protect the sealing element. Joints can be copper or carbon steel.

(4) Heat shrinkable

Since the welding point cannot be handled at the construction site, a heat-shrinkable pipe fitting is used as a supplementary seal. A rubber welding sleeve is put on the welding point of the square tube, and then a layer of special cross-linked polyethylene sleeve is covered, which shrinks under the action of heat. So as to achieve a shrinkage seal.

(5) Union flange

Turn the traditional flange into a joint flange, the square tube port is flanged or welded, the ring is embedded in the groove, the sealing rubber is placed in the groove, and the sealing element is protected by the method of limit compression.

(6) Welding type

Annular argon-arc welding is performed on the socket-type rectangular tube and the matching, which acts as a seal and completes the matching connection.

(7) Taper thread type

The outer threaded sleeve and matching are ring-shaped argon arc welding, and the inner threaded square tube is connected by a taper to seal and the matching connection is completed.