硼素鋼の研究 (II) : 含硼素 Mn 系強靱鋼の焼入性および機械的性質と実地に注湯中インゴットケース内硼素添加の適否について

概要

論文の詳細を見る
The effects of 0.003 and 0.006% B on the transformation, hardenability, quenched and tempered hardness and mechanical properties etc. of Mn-Cr and Mn-Cr-Mo high tensile steels were investigated. The results obtained were as follows. The Ac_1 points were not affected by addition B, But Ac_3 points were raised while Ar points were lowered. 0.003% B was more effective to increase the hardenability than 0.006% B and as compared with no adding B the hardenability increased remarkably by addition of B. The quenched and tempered hardness was not affected by addition of B above 300℃ of tempering temperature. The yielding point tensile strength and impact value increased a little by addition of B, but elongation and reduction of area were not affected. As one of the practical making processes of B steel, 400kg ingot was made by addition of B in the ingot mould while pouring the molten steel from ladle. The properties of this 400kg ingot were uniform and the effect of B on the ingot was the same as that of B on the small ingot which was made experimentally by a small furnace.
社団法人日本鉄鋼協会の論文
1955-10-01