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製鉄プロセスロールの表面処理技術

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.19 (1987) No.1

製鉄プロセスロールの表面処理技術

Development of Surface Treatment Techniques of Process Rolls on Iron and Steel Works

笠井 聡(Satoshi Kasai) 佐藤 裕二(Yuji Sato) 柳沢 章博(Akihiro Yanagisawa) 市原 晃(Akira Ichihara) 大西 廣(Hiromu Onishi)

要旨 : 製鉄プロセスにおけるロールを使用条件から大別し,それらの要求機能に適合する表面処 理技術の研究開発を行ってきた。熱間加工プロセス用ロールには,耐焼付き性,耐熱き裂性, 耐食性に重点を置いた肉盛溶接材料 KOA-H3(L),H3(M),H4 および H5 をそれぞれ開発 した。高温耐摩耗性が必要とされるハースロールにはCrC 系サーメット溶射材料が,耐ビ ルドアップ性が必要とされるハースロールにはCoCrAlY 系耐熱合金溶射材料が適すること を見いだした。また,コンダクタロールには,強酸水溶液に対する耐食性に重点を置いた WC 含有 Ni 基自溶性合金を,冷間加工プロセス用ロールには,表面粗度を長期にわたって 維持するために高硬度の WC 系溶射材料をそれぞれ適用した。これらにより,プロセスロ ールの高信頼性と長寿命化を図ることができた。 Synopsis :

Studies on surface treatment techniques of process rolls, except for working rolls in iron and steel works, were carried out by taking account of the operating conditions. Welding materials of rolls used in the continuous casting process and hot rolling process were developed, which would particularly satisfy such properties as adhesion resistance, heat-check resistance and wet-corrosion resistance. It was found out that CrC cermet with a superior wear-resistance property at high temperature and the CoCrAlY alloy with a build-up resistance property were suitable for hearth rolls. Furthermore, it was found out that WC containing Ni self-fusing alloys were suitable for conductor rolls and WC thermal spray materials were suitable for rolls used in the cold rolling process. Reliability and long-life of various process rolls were improved by these new techniques.

(c)JFE Steel Corporation, 2003

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