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1.概述日本钢管公司福山钢铁厂第二炼钢车间拥有三台两流宽板坯连铸机,用以浇注来自三座(通常为“三开二”)250吨LD转炉的钢水。三年以来,这三台连铸机每年浇注300万吨厚、薄板用的板坯。为了进一步提高连铸机的生产效率和大量生产连铸板坯,就必须充分了解结晶器内以及二次冷前几段的坯壳成形和增长情况。为确定高拉速的可能性,采用把放射性同位素加入到结晶器钢液内和自射线照相的方法,在康卡斯特板坯连铸机(见图1)上作了研究。本报告提供以下几方面的研究结果: (1)自结晶器到二次冷却终段全长上凝固坯壳的成形和增长情况; (2)改进结晶器出口以后的导坯和冷却系统,促使凝固坯壳均匀而迅速地增长。
1. Overview The Japanese steel pipe company Fukuyama Steel Works’ second steelmaking plant has three two-stage wide-slab caster machines for pouring molten steel from three (usually “three open two”) 250-ton LD converters. In three years, the three caster machines 3 million tons of slab per day for thin slabs. In order to further improve the continuous casting machine production efficiency and mass production of continuous casting slab, it is necessary to fully understand the crystallizer and pre-secondary cooling of the shell forming and growth. To determine the possibility of a high draw rate, research was conducted at Comcast Slab Caster (see Figure 1) using a method of adding radioisotopes to the mold steel and radiography. This report provides the following findings: (1) the formation and growth of the solidified shell over the entire length from the mold to the end of the secondary cooling; (2) the improvement of the billet and cooling system after the exit from the mold, Solidified shell evenly and rapidly grows.