Impact Toughness Analysis and Control of Thin-gauge Normalizing Container Plates
With the development of science and technology,the end user's performance requirements for pressure vessel plates(16MnDR,Q245R,L245NS,SA516Gr60/65/70,09MnNiDR,etc.)are becoming more and more demanding.While requiring impact toughness,the requirements for shear section rate are increased,which makes the low-temperature impact toughness index continue to improve.The impact toughness index of thin-gauge steel plate after normalizing is low due to the factors such as component segregation,strip structure,small rolling compression ratio and the inability to effectively control rolling and cooling while rolling.By optimizing the rolling process,the strip structure is reduced or even eliminated,and the rolled matrix structure is uniform and refined.After normalizing,accelerated cooling results show that the structure is mainly composed of ferrite and pearlite with certain content of subcooled bainite and martensite.The impact toughness of thin-gauge normalizing container plate can be improved by improving the structure morphology and thinning the structure uniformly.
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