Line Pipe is mainly used for manufacturing oil and gas transmission pipelines. Oil and gas pipelines is most convenient and safest lines connecting the resource area and the market consumption area. The construction of oil and gas transmission pipeline will not only ease the railway transportation pressure and also help to protect the security of supplying oil and gas to the market. Most importantly, it help to improve the energy security capacity in China. 

We also imported liquid natural gas (LNG) from Russia and the Central Asian Coutries. In order to deliver these natural gas to the main consumption areas, construction the transmission pipeline is essential. Today, the West-East Pipeline Project has been completed, in the future, China will construct Shaanxi-Beijing, the Sino-Russian natural gas pipeline (East, West Line), as well as Central Asia or Russia to Shanghai Natural Gas Pipeline and the ultimate "West-East Pipeline. 

In China, the crude oil, natural gas pipeline network have already been finished in a considerable scale, however, the refined oil pipeline is relatively cover 40%. Therefore, in the future, China plans to build 30,000 km pipeline which requires API 5L X65 pipe line with the outer diameter of 500mm and wall thickness below 10mm. In the next ten year, China will construct about 50,000 km of oil and gas pipelines, the average annual need for line pipe is nearly 5,000km. The annual requirements for steel pipeline for transmission natural gas is about 400 million tons.

With the develpment of pressure liquid pipeline deliery, oil and gas transmission line pipe is corresponding to the rapid development of high grade direction. In the internatioanl developed countries, API 5L X52 line pipe is widely used in 1960s, API 5L X60-X65 line pipe is commonly used for oil and gas transmission. However, in recent years, API 5L X70 line pipe is occupied th main market for oil and gas pipeline construction. In China, the most widely used line pipe is API 5L X52, X65, X70 line pipe with the outer diameter ranges from 1016mm to 1219mm, and the pressure rate is 10MPa.