Si 添加熱延鋼板の高圧水によるデスケーリング性に及ぼす P の影響

概要

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Scale defects, called "red-scale", frequently form in Si-added hot-rolled steel sheets because of poor hydraulic-descaling-ability in hot-rolling process. In this work, effect of P on the hydraulic-descaling-ability in Si-added hot-rolled steel sheets and the mechanism of descaling are investigated by red-scale reproduction test and the analysis of Fe-Si-P oxide. (1) Addition of P to Si-added steel improves the hydraulic-descaling-ability. (2) Because the addition of P lowers binary eutectic temperature of FeO/Fe_2SiO_4 oxides formed during slab soaking. Therefore the liquid eutectic compound in the scale/steel interface during the descaling improves the hydraulic-descaling-ability. (3) Furthermore high slab soaking temperature in addition to increase of P is more effective to improve the hydraulic-descaling-ability because of high descaling temperature. (4) The Fe-Si-P scales were synthesized from mixtures of the reagents of Fe, Fe_3O_4, SiO_2 and P_2O_5. Decrease in the binary eutectic temperature of FeO/Fe_2SiO_4 with P_2O_5 is clarified by thermal analysis of them.
社団法人日本鉄鋼協会の論文
1997-05-01