发明名称 |
Hearth roll in a continuous annealing furnace and its production method |
摘要 |
The hearth roll for a continuous annealing furnace is able to suppress the occurrence of buildup on the hearth roll surface and able to be stably used for a long period under the high temperature environment. The hearth roll has a cermet coating comprised 50 to 90 vol % of ceramic and the balance of a heat resistant alloy on its surface, the ceramic containing Cr3C2: over 50 to 90 vol %, Al2O3: 1 to 40 vol %, Y2O3: 0 to 3 vol %, and ZrB2: 0 to 40 vol % and having a balance of unavoidable impurities and pores, the heat resistant alloy containing Cr: 5 to 20 mass %, Al: 5 to 20 mass %, and one or both of Y and Si: 0.1 to 6 mass % and has a balance of one or both of Co and Ni and unavoidable impurities. |
申请公布号 |
US8864869(B2) |
申请公布日期 |
2014.10.21 |
申请号 |
US200812734680 |
申请日期 |
2008.11.28 |
申请人 |
Nippon Steel & Sumitomo Metal Corporation;Tocalo Co., Ltd. |
发明人 |
Kurisu Yasushi;Suidzu Tatsuo |
分类号 |
C22C19/05;C23C4/06;C22C19/07;C21D9/56;C23C4/18;C22C29/02;F27B9/24 |
主分类号 |
C22C19/05 |
代理机构 |
Kenyon & Kenyon LLP |
代理人 |
Kenyon & Kenyon LLP |
主权项 |
1. A hearth roll for a continuous annealing furnace, the hearth roll having a cermet coating comprising 60 to 80 vol % of a ceramic and a balance of a heat resistant alloy on a surface of the hearth roll, wherein
the ceramic comprises: Cr3C2: over 55 to 90 vol %, Al2O3: 1 to 40 vol %, Y2O3: 0.5 to 3 vol %, ZrB2: 0 to 40 vol %, and a balance of unavoidable impurities and pores, and the heat resistant alloy comprises: Cr: 5 to 20 mass %, Al: 5 to 20 mass %, one or both of Y and Si: 0.1 to 6 mass %, and a balance of one or both of Co and Ni and unavoidable impurities. |
地址 |
Tokyo JP |