Thermal spray coating method of hearth roll used for annealing of high tensile cold rolled steel sheet

摘要

The present invention relates to a thermal spray coating method of the hearth roll used during annealing of high tensile cold rolled steel sheet, the purpose of which is to use Mo ₂ C as the coating material of the hearth roll, there is no reactivity with manganese oxide during annealing the high tensile cold rolled steel sheet To provide a hearth roll having heat resistance in the temperature range of 900-1100 ℃.;The present invention for achieving the above object in the method of thermal spray coating on the hearth roll used in the annealing of high tensile cold rolled steel sheet, Mo ₂ C as a main component, Co: 50-60wt%, Ni: 7-12wt% A metal binder containing Cr: 15-25wt%, Al: 4-6wt%, Ta: 3-5wt%, and Y: 0.5-0.7wt% by 20-40 vol% compared to the Mo ₂ C The gist of the present invention relates to a spray coating method of a hearth roll used for annealing a high tensile cold rolled steel sheet which is thermally sprayed and coated on a washed hearth surface.