鋳片の組成および組織の均一性について : 鋼の連続鋳造に関する研究 VIII

概要

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Homogeneity of chemical compositions and constitution of continuously cast billets are examined. Si-Mn spring steel is cast into billets with different sectional sizes, 91mm∳, 130mm∳ and 170mm∳, and each casting time of a heat is 60mn. Results of analysis, observation and testing of billets are as follows. 1. The distribution of chemical compositions, oxygen content, sand content and content of nonmetallic inclusions are fairly homogeneous not only transversally but also longitudinally in spite of a long casting time. 2. Constitution of a billet of as-cast state consists of a chill zone, a coarse dendritic zone and a free crystal zone. 3. When a billet is rolled, its constitution of three zones, as mentioned above, is made homogeneous and the reduction ratio of area more than 10 gives it homogeneous mechanical properties. It is clear that a continuously cast billet has good characteristics as the rolling material.
社団法人日本鉄鋼協会の論文
1962-07-01