C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
38/11
C21D 9/56 (2006.01) F27D 3/02 (2006.01)
Patent
CA 1194300
- 14 - A HIGHLY BUILDUP-RESISTANT HEARTH ROLL FOR CONVEYING A STEEL STRIP THROUGH A CONTINUOUS ANNEALING FURNACE AND A METHOD THEREFOR ABSTRACT OF THE DISCLOSURE In a continuous annealing furnace, a steel strip is conveyed by conventional hearth rolls made of heat- -resistant cast steel, such as HK 40. However, since the formation of buildup is frequent, conventional hearth rolls are inappropriate for long-term operation of a continuous annealing furnace. In the hearth roll of the present invention, which consists of a solid or hollow roll body and a surface layer, the surface layer containing more than 15% by weight of Nb and the balance being inorganic material, the formation of buldup is not frequest, thereby making long-term operation of a continuous annealing furnace possible.
424959
Otoguro Yasuo
Yamanaka Mikio
Zaizen Takashi
Goudreau Gage Dubuc
Nippon Steel Corporation
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