インライン・リダクションによる双子(二連角型鋳片)材の製造と材質

概要

論文の詳細を見る
The tests to produce two 75mm square billets from twin-billet, to which a 120mm square cast billet is rolled by one pass, were carried out by an in-line reduction mill installed in a continuous casting machine. The produced billet is further hot-deformed to square or round bars in order to study the material properties and strength. The results obtained are as follows : 1. No crack was observed even after high reduction since sufficiently high temperature is maintained in the core of the billet during reduction process. The deformation resistance is as small as 5 to 6kg/mm^2. 2. The center porosity and other defects in the central part of the bar which were previously rolled from the twin billet can be completely eliminated, because the central part of the cast billet is deformed into the joint of the twin billet in the process of in-line reduction. 3. The surface of the bars at the joint of the twin billet shows a macro structure with a unique pattern which, however, diminishes by raising the rolling reduction ratio. The mechanical strength of the joint is found to be the same level as the other part for both low and medium carbon steels. But for a high carbon steel, the strength of the joint is lower than the other part.
社団法人日本鉄鋼協会の論文
1973-12-01