In order to improve the wear resistance of the chromium coating and extend the life of the copper mould tube, a 0.4-0.5mm thick nickel-cobalt alloy coating is
In order to improve the wear resistance of the chromium coating and extend the life of the copper mould tube, a 0.4-0.5mm thick nickel-cobalt alloy coating is added between the inner surface of the copper mould tube and the chromium plating layer as a transition layer. So it is called nickel-cobalt alloy-hard chromium plating. Referred to as composite copper-plated pipe. The metal content is: the hardness of the coating is 300-600HV.
Nickel-cobalt alloy coating has good chemical corrosion resistance, heat corrosion resistance and wear resistance. It not only blocks the diffusion of Zn, S, Cd and F in the molten steel on the inner surface of the copper mould tube, but also acts as a bonding agent between the inner surface of the mold copper tube and the chromium plating layer, which greatly improves the resistance of the chrome plating layer. Abrasiveness. In addition, after the chromium plating layer is worn, the nickel-cobalt alloy plating layer can continue to work instead of the chromium plating layer, thereby prolonging the service life of the copper mould tube.
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Harm of too high temperature: when molten steel out of cooper mold, the billet shell is thin and easy to break out; The accelerated erosion of refractory can ea
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1. The barrier function (mainly completed by the liquid slag layer) isolates the contact between air and molten steel, blocks the secondary oxidation of molten
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In continuous casting, low corrosion resistance often occurs, which directly leads to uneven composition and will eventually affect the smelting quality. In or