In order to improve the wear resistance of the chromium coating and extend the service life of the mold copper tube, the nickel cobalt alloy coating of 0.4 -- 0
In order to improve the wear resistance of the chromium coating and extend the service life of the mold copper tube, the nickel cobalt alloy coating of 0.4 -- 0.5mm thick was added between the inner surface of the mold copper tube and the chromium plating layer as the transition layer.So it is called nickel-cobalt alloy - hard chromium coating.Referred to as composite copper plating tube.The metal content is: the hardness of the coating is 300-600hV.
Nickel-cobalt alloy coating has good resistance to chemical corrosion, thermal erosion and wear resistance.It not only blocks the diffusion of Zn, S, Cd and F in molten steel to the inner surface of mold copper tube, but also acts as a binder between the inner surface of mold copper tube and chrome plating layer, which greatly improves the wear resistance of chrome plating layer.In addition, nickel-cobalt alloy coating can continue to work after the chromium plating layer is worn, so as to extend the service life of copper 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