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一.前言我公司1983年10月至1984年元月,用连铸船板坯轧成厚度≥6.0mm钢板,在热轧3~#横切线剪切时,出现剪切口“撕裂”现象,以致不能按船用钢交货而造成大量改判(“撕裂”缺陷如图1)。四个月的剪切量25577吨,合船板5972吨,占23.25％,余下19518吨改判A_s钢,减少经济效益390万元。为了研究产生这种缺陷的原因和改善船板质量,1984年进行了生产工艺试验和各项性能的检测等工作。如稳定铸坯拉速(控制在
I. Preface Our company from October 1983 to January 1984, the continuous casting ship slab rolled into a thickness of ≥ 6.0mm steel plate, hot rolled 3 ~ # cross-cut shear line, there shear phenomenon “tear” , So that a large number of commutations could not be made according to the delivery of marine steel (“Tear” defects as shown in Figure 1). Four months of the amount of 25,577 tons of shear, combined board 5,972 tons, accounting for 23.25%, the remaining 19,518 tons of A_s steel reformed, reducing economic benefits 3900000 yuan. In order to study the causes of such defects and improve the quality of the ship, 1984 conducted a production process test and the performance of the test. Such as stable casting speed (controlled at