I 形鋼に於ける表面氣泡疵について (II) : 氣泡の防止について

概要

論文の詳細を見る
A subsurface blowhole is a defect which has been encountered in almost every heat of killed steel and become the cause of rejection, especially in I-beam steels rolled directly from the small ingot in one heat without billeting. Its distribution is not equal in all ingots of one heat, nor in all ingots of one teeming group, nor in all portions of one ingot. Of course, insufficient deoxidation is the most powerful cause of the subsurface blowhole, but the above irregular distribution shows that the most important cause of the subsurface blowhole comes not from our melting practice, but from our pouring practice. The effect of the following variables on the subsurface blowhole wsa investigated from the standpoint of operation control, such as the life of ingot moulds, various coatings, teeming rate, ingot size, mixed water in coating etc.
社団法人日本鉄鋼協会の論文
1953-10-25