Research and development of X90 pipeline steel coil based on medium-thin slab
Combined with the development trend of pipeline steel technology,in accordance with the latest requirements of domestic and for-eign technical standards,and drawing on the development experience of large thick-walled X80 pipeline steel coil,the test research was car-ried out on the production of X90 pipeline steel coils for spiral welded pipes based on medium-thin slabs.The dynamic OCT curve of X90 pipeline steel was determined by the Gleeble-3800 thermal simulation tester,and the phase transformation law was obtained and the appro-priate cooling rate was determined.On this basis,through the design of its chemical composition,and the fine control of smelting,continu-ous casting,rolling and cooling processes,the industrial trial production of 16.3 mm×1 550 mm gauge X90 pipeline steel coil was completed in 2 150 mm ASP medium thin slab continuous casting and rolling production of Angang.Its tensile properties are qualified,-20 ℃ impact energy is not less than 300 J,-20 ℃ impact shear area is not less than 90％,-20 ℃ DWTT shear area is not less than 90％,the micro-structure is granular bainite,lath ferrite and dispersed M/A components,the property indicators meet the engineering requirements.Theφ1 219 mm×16.3 mm steel pipe is made by spiral submerged arc welding,and the property indexes of the steel pipe are good.The success-ful trial production of X90 pipeline steel coil has achieved a major breakthrough in the production of ultra-high strength pipeline steel of using medium thin slab in China,which is of great significance for the development of ultra-large diameter,higher steel grade,and thicker walled pipeline steel coil.
medium-thin slabX90 pipeline steel coilindustrial trial productiongreen and low-carbon
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