Cosmetic overlaying material for composite overlaying remanufacturing of support roller and preparation method for cosmetic overlaying material

Abstract

The invention provides a cosmetic overlaying material for the composite overlaying remanufacturing of a support roller and a preparation method for the cosmetic overlaying material. The deposited metal of the cosmetic overlaying material comprises the following components in percentage by weight: 0.1 to 0.3 percent of C, 1.0 to 2.8 percent of Mn, 0.3 to 1.8 percent of Si, 5.0 to 8.0 percent of Cr, 0.01 to 1.0 percent of Ti, 3.0 to 10 percent of V, 0 to 1.0 percent of W, 1.0 to 6.0 percent of Mo, 0.2 to 2.0 percent of Co, 0 to 0.4 percent of Ca and Ba, 0 to 0.3 percent of rare earth oxide and the balance of Fe. The preparation method comprises the following steps of (1) selecting corresponding compounds or alloy powder according to the proportion of the components in the deposited metal of the cosmetic overlaying material, and uniformly mixing the compounds or alloy powder to obtain cosmetic material powder according to the proportion; (2) rolling a steel strip on a wire rolling mill until the section of the steel strip is U-shaped, filling the cosmetic material powder into a U-shaped groove of the steel strip, rolling the steel strip into a welding wire pipe billet with an O-shaped section, and drawing the welding wire pipe billet into a finished product welding wire. According to the cosmetic overlaying material and the preparation method for the same, the working condition of a Cr5 large-sized support roller can be met, and the roller rolling cost is greatly lowered.

Description

technical field [0001] The present invention relates to a surfacing welding material for composite remanufacturing back-up rolls and a preparation method thereof, in particular to a surfacing material for overlaying composite remanufacturing of large-scale Cr5 backing rolls and a preparation method thereof, and belongs to the technical field of surfacing . Background technique [0002] Large Cr5 metallurgical back-up rolls have large size and weight, high performance requirements, and long manufacturing cycles. The traditional manufacturing process needs to go through complex processes such as electric furnace smelting, out-of-furnace refining, casting, forging, multiple heat treatments and machining, which consumes a lot of energy and discharges a lot of waste water, waste gas and waste residue. Moreover, the service conditions of large metallurgical back-up rolls are harsh, and they are severely worn during work, and surface defects such as cracks and peeling are prone to...

AI Technical Summary

Problems solved by technology

Due to the existence of a certain amount of residual austenite in the deposited metal of surfacing, it often leads to two serious consequences: first, cracks occur on the surface during the surfacing process or after surfacing, and literature analysis points out that the cracks propagate along the paralyzed austenite; During the rolling process of the roll, the back-up roll and the hot-rolled work roll contact each other and squeeze each other. Due to the stress-induced phase transformation, this part of the residual austenite is transformed into martensite under the action of compressive stress, resulting in huge internal stress. At the same time The "cold work hardening phenomenon" will cause cracks in the back-up rolls or the hardness of the back-up rolls will increase after hardening, which will seriously damage the work rolls and affect the normal rolling production

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