鋼の結晶粒度に關する二,三の研究
酸性及び鹽基性兩平爐鋼精錬過程に於ける結晶粒度の差異について
1953 年 39 巻 7 号 p. 698-704
詳細
1953 年 39 巻 7 号 p. 698-704
The authors studied on the characteristics and differences of acid and basic open-hearth furnace steels regarding the changes of grain size during the steel making process. The result obtained were as follows:
1) The grain size of basic furnace steel was irregular and that of acid furnace steel was homogeneous at every stage of steel making process, but the grain size of both the steels during the steels making process showed the same tendency of change. But the basic furnace steel which was deoxidized by additional ferro-silicon to the furnace before tapping, showed the homogeneous grain size after addition of its deoxidizer, and it is alike to acid furnace steel.
2) Grain size of the acid furnace steel in ladle was coarse compared with that of basic furnace steel, but it was homogeneous. Basic furnace steel showed fine but irregular grain size.
3) The refining reactions of the acid furnace were slow and thorough in the furuace, but the refining reactions of basic furnace were heavy aad imperfect in the furnace; and as deoxidizers were added into ladle, deoxidizing reactions were continued during the ingot casting process in the ladle. And amount of additional aluminum into ladle as deoxidizer was 0.03% in case of basic furnace and 0.01% in case of acid furnace.
4) It was thus evident that characteristics and differences of grain size in both the steels were caused by different refining methods of both furnaces.
