Aiming at the following a series of technical problems appeared in the manufacturing process of thick gauge X80 steel plate, ① low total compression ratio, difficult to refine the structure, ② small deformation and permeability of the heart, poor uniformity of the thickness of the cross-section structure performance, ③ steel plate width of about 4500mm, increased rolling torque, the existing unit is difficult to meet the load requirements, ④ A series of technical problems such as the cleanliness of materials and the uniformity of composition and structure of thick specification high strength steel in low temperature environment are more demanding, it is planned to systematically carry out technological innovation in key processes such as low-temperature X80 pipeline steel high-clean steel smelting and high-homogenization continuous casting technology, whole process organization homogenization and super-refinement control technology, control rolling and control cooling model optimization technology, plate shape and surface quality control technology for the first time in China. X80 steel plate has been developed to meet the requirements of ultra-wide (1422mm diameter) and ultra-thick (maximum thickness of steel plate 31.8mm) for the -40℃ low-temperature super-large volume pipeline. To ensure the construction of high-pressure long-distance oil and gas pipeline under low temperature environment in China, and comprehensively improve the variety, specification, quality level and application proportion of high-performance pipeline steel in China.
