| | Co-working Developing Co.,Ltd is the Co-working Group's subsidiary, specialize on manufacture steel pipeline in China.The Tianjin office opened in 2007 as a representative office is today a fully operational company to suit the development of the international market.
We are an integrated enterprise which manufature steel pipe, flanges, pipefittings and other dozens of product. There are 5 cooperative factories belonging to us. At present, five factory involving regional respectively refers carbon steel pipe , stainless steel pipe, carbon steel pipefittings,flanges,steel soil and so on.Our company is to develop into a product diversification. Operated numerous venues. Tens of millions of ultra-turnover group.
Our steel pipe factory put into production in 2008, total investment of 940 million Yuan, and covers an area of 200 acres. There are 500 staff currently. The area of the building is 100,000 square meters. Our company is one of the largest professional manufa-cturers of seamless steel tubes in Hebei Province. The main products are all kinds of specification of tubes, such as oil pipeline tubes, casing tubes, GB8162 structure tubes, GB8163 liquid tubes, GB3087 low-middle pressure boiler tubes, GB5310 high pressure boiler tubes, and GB6479 special fertilizer tubes, Etc. All are produced according to standard API5L or API5CT. The annual production capacity is 300,000 tons. we can offer our clients such as seamless carbon steel pipe with Outside Diameter Range of pipes is from 140-273mm(5inch-10inch), and Wall Thickness Range is from 6-40mm(SCH,STD,XS). With Accu-Rolled seamless steel pipe production line, major manufacturing process includes: Taper Boring, Accu-Rolling and Three Roll Mini Tension Reducing process.The above process assures exactly sizing, also keeps high quality on internal and external surfaces.
Equipped with online ultrasonic detection system， eddy current detection system, magnetic leakage detection system; Also equipped with automatic length measuring, weighting, marking system; The advanced Heat Treatment Production Line, has imported Temperature Control System from Krom Schroder Germany; imported patent product from Xian Heavy Machinery Institute, a significant pipe manufacturing equipment producer, in China. And imported online Ultrasonic Detection System, from Unicorn Company England, with multi-detecting capacity and covering the whole wall thickness testing for the pipe. Equipped with advanced manufacturing process, complete test and inspection system, strictly process control system has assured stable and high quality pipes being produced in our workshop. The pipes being designed and manufactured by our company have received API 5L, API 5CT, monogram certificates; ISO 9001 Quality Assurance Certificate; OHSAS 18001 Occupational Safety and Health Administration Certificate, ISO 14001 Environment Management Certificates，etc..
Pipe fittings is a traditional forest product in our group, especially in recent years, it has enioyed a rapid development. We can supply All kinds of pipe fittings from 1" through 96″ in carbon steel,alloy steel,high yield steel and stainless steel, such as elbows, tees, reducers etc..For elbows,both Seamless (up to 36”) and Welded(16″-96″) are available. For seamless tees, 24” is generally the maximum and forged pipes will be used as base materials if seamless tees more than 24” are required. All welded tees are between 24” and 56” with one weld at the back of the run pipe (No weld repairs are allowed on other parts of the tees) For reducers, 24” is the maximum for seamless construction. Reducers more than 26” (including 26”) are produced with one weld in the shape of taper.
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