冷延鋼板用アルミキルド鋼の連続鋳造・熱間圧延直結工程における AIN の析出挙動(組織と材質)(<特集>連続鋳造-熱間圧延の直結化)

概要

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A continuous casting and direct rolling process for Al-killed cold-rolled steel sheets was examined. AIN precipitation in steels which were melted before precipitation treatment was studied in the laboratory and AIN precipitation diagrams (TTP) were obtained. AIN precipitation in melting-treated steels is delayed and a larger amount of aluminum and nitrogen are kept in solution in comparison with that in AIN solution-tre-ated steels. When the temperature of steels after casting and solidification is kept above Ar_3 transformation temperature, AIN hardly precipitates. Production-scale tests of the process were performed by using the continuous casting machine and the hot strip mill. AIN precipitation in hot-rolled steel sheets was also observed. Enough amount of solute aluminum and nitrogen for obtaining high γ-value after cold-rolling and box-annealing were maintained in hot-rolled steel sheets. Even in case of high content of aluminum and nitrogen, most of them are in solution in hot-rolled sheets and cold-rolled steel sheets which have high γ-value are obtained by using the process.
社団法人日本鉄鋼協会の論文
1988-07-01