Cobalt-based composite powder used for restoring rack of rolling mill and method for restoring rack of rolling mill

Abstract

The invention provides cobalt-based composite powder used for restoring a rack of a rolling mill and a method for restoring the rack of the rolling mill. The composite powder is composed of, by weight, 5 percent to 40 percent of chromium carbide and the balance of the cobalt-based powder, and the cobalt-based powder is composed of, by weight, 0.6 percent to 1 percent of C, 20 percent to 30 percent of Cr, 0.1 percent to 0.6 percent of Si, 0.1 percent to 0.5 percent of Mn, 5 percent to 10 percent of W, 0.5 percent to 3 percent of Fe, 5 percent to 12 percent of Ni and the balance of Co. According to the preparing process, the restored surface of the rack of the rolling mill is machined; nondestructive testing is performed on the restored surface; high-power semiconductor laser beams output by an optical fiber coupling are irradiated to the restored surface, reciprocating laser cladding machining is performed through programming of a robot, the composite powder is sintered to the base body of the rack of the rolling mill, and a cladding layer is obtained; the surface of the cladding layer is machined to meet the requirements for size accuracy and cleanliness of the surface; the method has the advantages of being short in restoring cycle, high in powder utilization rate, low in energy consumption and the like.

Description

technical field [0001] The invention relates to material repairing, and in particular provides a cobalt-based composite powder for repairing a steel rolling mill frame and a repairing method thereof. Background technique [0002] The frame, commonly known as the archway, is the skeleton of the working stand of the rolling mill. It bears all the rolling force transmitted through the bearing seat and is subject to greater impact. Moreover, during the working process of the rolling mill, the rolling cooling water encounters the red-burning steel billet and rapidly atomizes, entraining the iron oxide powder falling off the surface of the billet and spraying it to the surroundings, so that the inner window surface of the rolling mill frame archway, the bottom surface of the rack archway, etc. There are different degrees of corrosion and wear, and the gap between the rolling mill stand and the roll bearing seat often exceeds the management limit. The working environment of the ro...

AI Technical Summary

Problems solved by technology

[0007] In view of this, the object of the present invention is to provide a cobalt-based composite powder for the repair of a steel rolling mill frame and its repair method, so as to at least solve the problem of poor bonding between the powder and the repair frame and the long repair period in the past frame repair. , low powder utilization rate, large energy consumption and other issues