Hearth roll and manufacturing method therefor
AssigneesNippon Steel & Sumitomo Metal Corporation, Tocalo Co., Ltd.
InventorsYasushi KURISU, Tatsuo SUIDZU
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Abstract
A hearth roll includes a base roll, a thermally sprayed coating formed on the base roll, and a modified coating formed on the thermally sprayed coating. The modified coating is formed by modifying a part or the whole of a surface of the thermally sprayed coating by melting and solidification of the thermally sprayed coating, by irradiating a part or the whole of the surface of the thermally sprayed coating with an energy beam. The thickness of the modified coating is from 2 to 20 μm, and the Vickers hardness HV of the modified coating is from 1.2 to 1.4 times larger than the Vickers hardness HV of the thermally sprayed coating.
Claims10
A hearth roll, comprising:
- a base roll;
- a thermally sprayed coating formed on the base roll;
- and
- a modified coating formed on the thermally sprayed coating, the modified coating being formed by modifying a part or the whole of a surface of the thermally sprayed coating by melting and solidification of the thermally sprayed coating, by irradiating a part or the whole of the surface of the thermally sprayed coating with an energy beam,
- a thickness of the modified coating being from 2 to 20 μm, and
- a Vickers hardness HV of the modified coating being from 1.2 to 1.4 times larger than a Vickers hardness HV of the thermally sprayed coating.
A method of producing a hearth roll, comprising a step of irradiating a part or the whole of a surface of a thermally sprayed coating formed on a base roll with an energy beam, thereby modifying a part or the whole of the surface of the thermally sprayed coating by melting and solidification of the thermally sprayed coating, to foam a modified coating having a thickness of from 2 to 20 μm and a Vickers hardness HV that is from 1.2 to 1.4 times larger than the Vickers hardness HV of the thermally sprayed coating.
Dependencies are inferred from the claim text.