Composite-coating continuous casting crystallizer copper plate with long service life and manufacturing technology thereof

Abstract

The invention provides a composite-coating continuous casting crystallizer copper plate with a long service life and a manufacturing technology thereof and belongs to the technical field of electroplating. The composite-coating continuous casting crystallizer copper plate with the long service life comprises a copper plate substrate and a coating on the surface of the copper plate substrate. The coating comprises an upper electroplating layer and a lower coating layer. The upper electroplated layer is a pure nickel layer or a low-cobalt nickel alloy layer resistant to high temperature and corrosion. The mass percent of cobalt in the low-cobalt nickel alloy layer is not higher than 3%. The lower coating layer is a wear-resistant coating layer or a ceramic coating layer. According to the composite-coating continuous casting crystallizer copper plate with the long service life and the manufacturing technology thereof, the electroplating technology and the supersonic thermal coating technology are combined, the upper portion and the lower portion of the crystallizer copper plate are different alloy coating layers, the different requirements for the upper portion and the lower portion of the crystallizer copper plate in continuous casting are effectively met, the upper electroplating layer is not prone to thermally cracking and falling at a high temperature, the lower coating layer has the excellent wear-resistant performance, in this way, the service life of the continuous casting crystallizer copper plate is greatly prolonged, and the product quality is greatly improved.

Description

Technical field [0001] The invention belongs to the technical field of surface treatment, and particularly relates to a long-life composite coating continuous casting mold copper plate and a preparation process thereof. Background technique [0002] As the core device for continuous steel casting production, the quality of the mold directly affects the quality of the cast slab and the operating rate of the continuous casting machine. [0003] During continuous casting production, the inner surface of the mold copper plate is in direct contact with the boiling molten steel and molten mold powder, and the outer surface is forced to cool with water. The sliding friction between the inner wall and the casting slab is also accompanied by the harsh working environment. Higher requirements are put forward. However, electroplating of a single electroplated layer and conventional alloy coating can no longer meet the current situation of high-efficiency continuous casting machine with a larg...

AI Technical Summary

Problems solved by technology

[0003] During continuous casting, the inner surface of the copper plate of the mold is in direct contact with boiling molten steel and molten mold slag, and the outer surface is forced to cool with water, accompanied by sliding friction between the inner wall and the slab. The harsh working environment affects the copper plate of the continuous casting mold Higher requirements have been put forward, but the electroplating single electroplating layer and the conventional alloy coating can no longer meet the current situation that the high-efficiency continuous casting machine has a large amount of steel passing through the mold at a time and the casting speed is fast. During the use of casting speed, the heat that needs to be exported per unit time increases, heat resistance is prone to fatigue, and wear is large. Unplanned off-line of the mold copper plate leads to an increase in the amount and frequency of mold copper plate repairs, low work efficiency, and serious restrictions on normal production. running, wasting raw materials, increasing production costs

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