Method and apparatus for continuously annealing metal strip...

Details Method and apparatus for continuously annealing metal strip... Method and apparatus for continuously annealing metal strip...

C - Chemistry, Metallurgy

21

D

38/34, 38/8

C21D 9/56 (2006.01) C21D 1/00 (2006.01)

Patent

CA 1258971

ABSTRACT OF THE DISCLOSURE 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 or equal to 450°C. On the other hand, the plated rolls are arranged in a region where the temperature is lower than 450°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 1µm and less than or equal to 100µm. In addition. according to the invention, the hearth roll is provided a surface roughness Ra in the range of 4.5µm to 20µm.

546129

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