Metallurgical apparatus – Means treating a continuum of work – With heating means
Patent
1989-05-30
1990-03-20
McDowell, Robert
Metallurgical apparatus
Means treating a continuum of work
With heating means
291218, 29132, 226193, 266274, 432246, C21D 956
Patent
active
049094858
ABSTRACT:
An improved layout of the hearth rolls in an annealing furnace comprises a plurality of ceramic coated rolls and a plated rolls. The ceramic coated rolls are arranged in a region in the annealing furnace, where the temperature is higher than 450.degree. C. On the other hand, the plated rolls are arranged in a region where the temperature is lower than or equal to 450.degree. C. The hearth roll is provided a wear resistant coating of chrome plate or sprayed on ceramic of a thickness greater than or equal to 1 .mu.m and less than or equal to 100 .mu.m. In addition, according to the invention, the hearth roll is provided a surface roughness Ra in the range of 4.5 .mu.m to 20 .mu.m.
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Metals Handbook, vol. 5, pp. 170-171, .COPYRGT.1982.
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Transactions ISIJ, vol. 26, No. 9, Sep., 1986, p. 843, Tokyo, Japan; "Application of Cr-C Cermet Coating to Hearth Roll in Continuous Annealing Furnace".
Patent Abstracts of Japan, vol. 8, No. 172 (C-237), 11/9/84 JPA 59-70712, 4/21/84.
Patent Abstracts of Japan, vol. 5, No. 136, (C-69), 8/28/81 and JP-A 56-69321, 6/10/81.
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Kasai Satoshi
Ohnishi Tteo
Ohno Hironobu
Shimoyama Yuji
Yamaguchi Yasuhiro
Kawasaki Steel Corp.
McDowell Robert
Miller Austin R.
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