Surface coating for furnace roller of continuous annealing furnace and after-treatment method thereof

Abstract

The invention discloses a surface coating of a furnace roller of a continuous annealing furnace and an after-treatment method thereof. The coating material consists of the following compositions in percentage by weight: 80 to 85 percent of metal mixture CoCrAlY, and 15 to 20 percent of ZrB2 (ceramics), wherein the metal mixture CoCrAlY comprises the following elements in percentage by weight: 70 to 80 percent of Co, 5 to 10 percent of Al, 10 to 20 percent of Cr, and 0.1 to 0.8 percent of Y (sum of Al and Cr is less than or equal to 30 percent). After the furnace roller is sprayed, clearances of the coating are subjected to hole sealing and then the coating is continuously fired at high temperature after hole sealing. The coating and the method improve the clogging resistance of each furnace temperature segment of the annealing furnace. The surface hole sealing treatment eliminates the clearances among spray coatings. A more compact protective film is formed on the coating of the rollersurface after high temperature firing, so the method improves the iron and manganese clogging resistance of the coating.

Description

technical field [0001] The invention relates to the coating on the surface of the furnace roll of a continuous annealing unit for metallurgical cold-rolled strip steel, in particular to the composition of the coating material on the surface of the furnace roll; after spraying, the gaps in the coating on the surface of the furnace roll are sealed; system. Background technique [0002] The continuous annealing furnace for cold-rolled strip steel is a nitrogen-hydrogen protective gas, which has reducing properties. The residual oxides on the surface of the steel plate are reduced to Fe, Mn and other elements in the furnace atmosphere, and these elements and furnace roll materials (mostly heat-resistant stainless steel) ) has strong affinity and mutual solubility, and it is easy to form hard-to-remove build-ups when it adheres to the roller surface and chemically reacts with the body material of the furnace roller. In addition, as the working temperature of the furnace roller in...

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Problems solved by technology

[0008] Explosive spraying is also an emerging spraying method, and the representative spraying material brand is LCO-17 (the coating composition system is CoCrAlY-10%Al 2 o 3 ), this spraying method has small gaps in the coating and high bonding strength with the base material, but the efficiency of explosive spraying is low, and the general explosion frequency does

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