Steel pipe steel products as an important part of national economic development play a significant role in the molding process due to the welding method and the use of different shapes into large-diameter tube seamless, straight seam steel pipe, spiral welded pipe. Divided into high-frequency straight seam steel pipe, and large diameter LSAW steel pipe. Currently, the world's steel industry is the general trend: the growth rate of output pipe seamless pipe is faster than the growth rate;

Steel pipe production is proportionately much larger than seamless; seamless in all areas of market competition;

tube in the pipe, ERW steel pipe production on the dominant and long-distance oil and gas pipelines, city gas pipelines within the field of use LSAW pipe, and spiral SAW pipes for the market.

The pipe is accompanied by the development of technology and is seamless and progressive. Pipe in some areas will be seamless to gradually replace the inevitable trend, the key factor is the continuous improvement of product quality and lower manufacturing costs. Improving the quality of welded products, mainly rely on three technological advances: First, iron and steel smelting technology, and second, hot-rolled strip technology, third, steel manufacturing process. In Western countries, focused on broadening the use of ERW pipe area, the North American representative of the United States as the key development ERW OCTG range of applications, in the 1980s in the 3000m deep wells have been commonly used ERW casing;

to Germany on behalf of Europe, focus on developing the application of boiler tubes, ERW pipe production in low-pressure boiler pipe applications is common, accounting for more than half of the total boiler tubes, also used by some high-pressure boiler tubes ERW pipe. Asia to Japan, South Korea, represented almost fully developed the application of ERW pipe; South Korea, the country's total steel pipe more than 98% of total output, while the ERW pipe and pipe production account for more than 90%; Japan, due to weldingrapid advances in technology management and production costs down, and gradually replace some of the UOE pipe and seamless pipe.

Bound as a substitute in the future development trend of seamless pipe, welded steel pipe production technology manufacturing company has been the escalation of the future will use the product line and more comprehensive, higher quality pipe.
Q215, Q235A, B steel and 20 steel, diameter 63.5-219.0mm.

On the tube bending, end with the vertical center line, and ellipse there are certain requirements, usually the pressure and flattening test.

Cangzhou Shenlong Pipe Manufacturing Co., Ltd. cooperates with Baosteel and Baogang to produce large-caliber seamless steel pipe, straight-seam welded pipe, spiral steel pipe, and pipe fittings. The products comply with API, ASTM, DIN, BS, and JIS standards, and can accept SGS, BV, and other inspections. The products are used in oil, natural gas, bridge, water conservancy, and other large-scale projects, which are worthy of trust.