Sumitomo Metal Industries, Inc.

Yasuo Shimada

Yoshihiko Hoboh

Tadashi Nonaka

Atsuhisa Yakawa

Hiroshi Oishi

Takao Hino

Tomio Kondo

Sadayuki Wachi

Hisakazu Morino

Kenichi Ohiwa

Kazuhide Oshima

Yoshikazu Yamanaka

A continuous multi-layer plating line for steel sheet which includes a hot-galvanizing apparatus to form a galvanized coating and optionally to alloy the coating and an electroplating apparatus to form an electroplated coating on the galvanized coating. Between the hot-galvanizing apparatus and the electroplating apparatus, a post-galvanizing surface treatment apparatus effective for removing surface oxide contaminants and activating the surface of the galvanized coating is disposed and the galvanized steel sheet is treated thereby prior to electroplating. The post-galvanizing surface treatment may be carried out by applying an alkali solution or an acid which can dissolve aluminum oxide to the galvanized coating, by alkali electrolysis, by cathodic electrolysis, by cooling the galvanized steel sheet with an alkali solution, or by skin-pass rolling using an alkali solution or an acid which can dissolve aluminum oxide as a skin-pass roling liquid.

Electroplating of hot-galvanized steel sheet and continuous plating line

A heat-resisting furnace roll which comprises a support roll and a ceramic sleeve fitted over said support roll is disclosed. The ceramic sleeve fits loosely over the support roll even when said support roll exhibits maximum expansion in both its radial and longitudinal directions.

Heat-resisting furnace roll

Growing community of inventors

Sennan, Japan

Yasuo Shimada