API pipeline is a pipeline that belongs to the American petroleum standard. The pipeline pipeline is used to deliver oil, steam and water extracted from the ground to the oil and gas industry through pipelines. The pipeline pipe comprises a seamless pipe and a welded steel pipe with a flat end, a threaded end and a socket end; The connection mode is end welding, collar connection, socket connection and so on.

With the development of the pipeline steel plate technology and the progress of welded pipe forming, welding technology, the application range of the pipe with welded pipe in gradually expanding, especially in the large diameter welded pipe class scope advantages more apparent, and cost factors, welded pipe has been dominant in the field of line pipe, which limits the development of stainless steel seamless steel line pipe. In 2004, THE production OF SEAMLESS pipeline pipe is about 400,000 T, the steel grade includes X42-70, and the varieties are onshore pipeline pipe and submarine pipeline pipe.

The production of high steel grade pipeline pipe adopts microalloying heating treatment process. The production cost of stainless steel seamless pipe is obviously higher than that of welded pipe. Moreover, with the improvement of steel grade, such as the carbon equivalent limitation of steel grade above X80 pipeline pipe, the conventional process of seamless pipe is difficult to meet the requirements of users. In order to improve the corrosion resistance of pipelines and pipes, the stable performance in low temperature and high temperature environment and carry out scientific research.

Pipeline steel pipe material: L245, L360, A53, J55, N80, X42, X46, X52, X56, X60, X65, X70

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, JIS standards, and can accept SGS,BV and other inspection. The products are used in oil, natural gas, bridge, water conservancy and other large-scale projects, which are worthy of trust.