Sumitomo Metal Industries, Inc.

Nsk Corporation

Atsuhisa Yakawa

Satoshi Ikeda

Toshihiro Mori

Yukio Sato

Nobukazu Suzuki

Yoshihiko Hoboh

Takao Hashimoto

Tetsuaki Tsuda

Yukihiro Yoshikawa

Tadashi Nonaka

Seiji Bando

Akio Aoki

Hiroshi Oishi

Katsuhiro Nojima

Shin Niizeki

Yasuo Shimada

Yoshikazu Yamanaka

Koji Ando

Tomio Kondo

Hisakazu Morino

Kazuhide Oshima

In a roller support device, an inner peripheral surface of a bearing box is covered with a material having a poor wettability with respect to a molten metal, such as tantalum, graphite, C/C composite, silicon carbide or the like. The molten metal does not adhere to the covered portion, or even if the molten metal adheres to and is solidified on the covered portion, the molten metal can be peeled off with a light force. Therefore, after a support roller is pulled up from the molten metal, the molten metal does not prevent a rolling bearing from shifting in the axial direction thereof so that the roller support device can prevent an excessive force from being applied to the rolling bearing when the support roller, after it is thermally expanded once, is contracted as the temperature falls.

Roller support device in molten metal plating bath

A surface-coated steel sheet having improved corrosion resistance and suitable for use as automobile inner and outer panels comprises a steel sheet having on at least one surface thereof a composite coating which comprises the following layers (a) to (d) from the bottom to the top of the coating:

Corrosion-resistant surface-coated steel sheet

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

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Nishinomiya, Japan

Atsuhisa Yakawa