About YASUMOTO KUNIO
About 住友金属工業和歌山製鉄所
About YAKATA SADAO
About 住友金属工業和歌山製鉄所
About YAMASHITA RIYOICHI
About 住友金属工業和歌山製鉄所
About YAMAMOTO KAZUHIRO
About 住友金属工業和歌山製鉄所
About alumina
About Heat treatment of ore
About Iron ores
About Al2O3
About 焼結性