【摘要】 采用控制轧制工艺对0.14%～0.18%C,1.40%～1.60%Mn Q355D钢250 mm连铸板坯进行热轧,结果表明,在粗轧温度1 050～1 130℃、精轧温度920℃、终轧温度880℃控制轧制条件下,终冷温度在670℃以下生产的厚板组织细小均匀,生产70 mm和80 mm规格厚板性能符合Q355D级别要求,并且Z25断面收缩率(RA)为58%～64%满足Z25方向RA≥25%的要求。更多还原

【Abstract】 The 250 mm casting slab of steel Q355 D bearing 0.14% ～0.18% C and 1.40%～1.60% Mn is hot-rolled by the controlled rolling process.The results show that the microstructure of rolled plate is fine and uniform by rough rolling at 1 050～1 130 ℃ finishing rolling at 920 ℃ and final rolling at 880 ℃,and the final cooling below 670 ℃,the properties of the 70 mm and 80 mm thick plate can meet the requirements of Q355 D steel grade and the Z25 reduction of area(RA) is 58%～64% to meet the requirement of Z25 direction RA≥25%.更多还原