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针对传统流程和薄板坯连铸连轧2种流程生产的中高碳钢的差异进行了对比分析并探究其产生的原因。研究结果表明:与传统流程相比,薄板坯连铸连轧铸坯的冷却速度和凝固速度快,钢中易偏析元素来不及扩散偏聚,非金属夹杂物也不易聚集长大,碳的最大偏析度为1.16,较传统流程有明显改善,氧化物、氮化物、硫化物等非金属夹杂物的尺寸较细小但数量明显多于传统流程。同时,由于薄板坯连铸连轧流程具有铸坯加热温度低、在炉时间短的特点,有利于降低铸坯表面碳的扩散速度,减少脱碳量,脱碳层深度小于板带厚度的1.0%,为传统流程脱碳层深度的30%~60%。
The differences between medium and high carbon steels produced by the two processes of the traditional process and the thin slab continuous casting and rolling are analyzed comparatively and the reasons for their occurrence are analyzed. The results show that compared with the traditional process, the cooling rate and solidification speed of thin slab continuous casting and rolling slab are faster than that of the easy segregation element in steel, and the nonmetallic inclusions are not easy to aggregate and grow up. The maximum segregation of carbon Degree of 1.16, compared with the traditional process has been significantly improved, oxides, nitrides, sulfides and other non-metallic inclusions smaller size but a significant number more than the traditional process. At the same time, the process of thin slab continuous casting and rolling has the characteristics of low slab heating temperature and short furnace time, which is beneficial to reduce the diffusion speed of carbon on the slab surface, reduce the amount of decarburization, and the depth of decarburization layer is less than 1.0 %, 30% ~ 60% of the depth of decarburization layer in the traditional process.