熱間タンデム圧延における難加工性材料の線材製造技術

概要

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For a while ago, wires and rods of workhardable materials such as high speed tool steels and super alloys were hot rolled in Kawasaki plant with repeater mill. Their low capacity and high resistance of these materials to deform render them unsuitable for tandem rolling with larger billets. Moreover, the plants(melting, ingot break down, rolling, heat treating and pickling) spread over wide areas. Thus, further increase in physical distribution costs and tighter delivery date have become the issues. In order to reduce the manufacturing costs in wires and rods of workhardable materials, tandem hot rolling technique in Hoshizaki Plant of Daido Steel was in need. In roughing mill, roll pass design was considered in order to avoid crack on the surface. And in continuous train, entry speed to 1st pass was also controlled to reduce exposed time to air. Moreover, control of finishing speed prevented materials from internal melting. As a result recommended processes were established. Rolling shop was switched from Kawasaki bar and wire rod mill plant to Hoshizaki wire rod mill plant. Considerable improvement in productivity and costs was achieved.
電気製鋼研究会の論文