As a kind of high temperature plate, in addition to good wear resistance, corrosion resistance and high hardness and other basic mechanical properties, GB/T 11251 40Cr steel plate also need to meet certain surface light. But the improper operation or insufficient preparation work will reduce the brightness of GB/T 11251 40Cr steel plate.
One of the important factors that influent the surface quality of GB/T 11251 40Cr steel plate is that the oil content of the emulsion is too high. The emulsion is a necessary solution to the Alloy steel plate. It plays an important role in the smoothness and cooling of the 40Cr alloy plate, but the oil is contained in the emulsion. The experienced people know that the oil cleavages into carbon at high temperature. If the oil in the emulsion can not be removed in time after high temperature carbonization, it will be deposited on the surface of GB/T 11251 40Cr steel plate, and indentation will be formed after rolling.
Because of the oil content in the emulsion is large, it will become carbonization after annealing in the inner wall of the maintenance cover. In other process, the carbon will be taken to the surface of the GB/T 11251 40Cr steel plate, thus affect the appearance quality. After a long period of processing, a lot of oil, carbon black and dust will be deposited on the convective plate and the hearth. If it is not cleaned in time, it will also fall on the surface of GB/T 11251 40Cr steel plate.
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