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％.
Differences of medium-high carbon steels produced by traditional process and thin slab casting and rolling process (TSCR process) were compared and their causes were explored.The results show that TSCR process,characterized by much faster cooling speed and higher solidifying rate of slab compared with traditional process,is helpful to inhibit segregation of chemical composition,refine the non-metallic inclusions.The maximum carbon segregation rate is 1.16,much lower than that of traditional process,and the sizes of non-metallic inclusions,such as oxide,nitride and sulphide,are smaller than that of traditional process,but the numbers are more than that of traditional process.At the same time,because of low heating temperature and short stay time in roller-hearth furnace,the diffusion speed of carbon on surface of slab and the amount of decarbonization are reduced and the decarburization depth is less than 1.0％ of strip's thickness,only 30％-60％ of the decarburization depth by traditional process.
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