Abstract：

　　This paper reviews the research, development and achievement of high grade pipeline steels, steel pipes and oil and gas pipelines in China and their development trends. In China, the research and development of oil and gas pipelines, high grade pipeline steels and steel pipelines has the following characteristics. 1) The research and development cycle is short; 2) The research results can be applied quickly; 3) The application effects are good. After nearly 20 years of effort, China has reached an advanced level in the following two aspects. One is the parameter optimization technology of pipe type, steel grade, materials and size of oil and gas transportation pipelines with large-diameters and high pressures. Another is the research and application of high grade pipe steels. Basic research into steel and pipeline technologies has achieved substantial progress in China. This includes the materials selection of X70/X80 grade steel, the identification and examination of the acicular ferrite pipeline steel microstructures, the pipe type selection and the residual stress control technology of spiral submerged-arc welding pipes, the fracture control technology of high pressure gas pipelines, pipeline deformation control technology in the areas of strain-based design, the testing and evaluation technology of high grade and thick wall pipeline steels and steel pipes and the embrittlement mechanisms, fracture occurrence and prevention technology of the high grade steel pipeline steels in heat affected welding areas. The design factor of class I area was enhanced to 0.8. A lot of new technologies were also developed in product research. The X70/X80 hot rolled plate and the large-diameter thick wall longitudinal submerged arc-welded pipe manufacture technology, the induction bends and the fitting material design and the manufacture technology were exploited. The diameter of X80 steel pipes was expanded to 1422 mm. The preliminary research into X90 pipe has been finished. In order to better meet the requirement of large-diameter high-pressure pipeline engineering, the basic applications research must be deepened further. We need to cooperate to develop products and technology. The optimization technology between the transportation capacity of large-diameter high grade steel gas pipeline and other parameters (pressure, steel grade, design factor, pipe diameter, wall thickness, etc.) needs to be developed. We also need to establish or improve the theory and methods of strain-based design, reliability-based design and fracture control of high-pressure gas pipelines. The key technical problems such as yield to tensile-strength ratio, strain aging, low temperature toughness, yield strength tests of X90-X120 high grade steel and pipes should be studied and solved. The correlation between composition, microstructure, process, property and performance of high grade pipes has to be mastered. Mass production capabilities require collaboration between metallurgy enterprises and pipe-makers. X90-X120 pipe field welding technology has to be developed and the girth weld performance level improved. A major breakthrough in high grade steel pipeline steels and the steel pipes production and application technology is required.

Key words： high grade pipeline steel high grade steel pipe pipeline basic research research progress development prospect

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Cite this article：FENG Yaorong,HUO Chunyong,JI Lingkang, et al. Progress and prospects of research and applications of high grade pipeline steels & steel pipes in China[J]. 石油科学通报, 2016, 1(1): 143-153.

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