Nippon Steel Hardfacing Co., Ltd.

Nippon Steel & Sumikin Hardfacing Co., Ltd.

Tatsuhiro Shigemitsu

Masahiro Noguchi

Yu Li

Junichi Yasuoka

A cermet thermal spray powder generates a dense sprayed coating with superior wear resistance, superior toughness, superior resistance to molten metal, and superior resistance to thermal shock. The cermet thermal spray powder is sprayed onto a surface of a roller for a molten metal plating bath, wherein the powder includes: a first boride including W; a second boride including Cr; binder alloy particles including at least W, Cr, and Co; and unavoidable impurities; the content of B being 4.5% by mass to 8.5% by mass and the content of W being 50% by mass to 85% by mass with respect to 100% by mass of the cermet thermal spray powder.

Cermet thermal spray powder, roller for molten metal plating bath, article in molten metal plating bath

The hearth roll includes a thermally sprayed coating formed on the surface thereof. The thermally sprayed coating includes a nitride, an oxide, or a multiple oxide, and a matrix material composed of one or two or more metals. In the hearth roll having high Mn build-up resistance, the following expressions are satisfied: 3% by volume&#x2266;X&#x2266;50% by volume; 3% by volume&#x2266;X&#x2266;50% by volume; and 40% by volume&#x2266;X+X&#x2266;80% by volume, in which Xis the percentage by volume of the nitride contained in the thermally sprayed coating with respect to the total volume (10% by volume) of the thermally sprayed coating, and Xis the percentage by volume of the oxide or the multiple oxide contained in the thermally sprayed coating with respect to the total volume of the thermally sprayed coating.

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Tokyo, Japan

Tatsuhiro Shigemitsu