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我厂生产的球铁冷铸轧辊经常发现辊身表面出现针孔和白点,从轧辊断面可直接观察出大小不一的黑点,最大的黑点直径达5毫米,分布于断面各处,有的轧辊断面上的黑点竟占断面面积的五分之一之多,严重影响轧制钢材的表面质量。为此,我们从原材料、炉前控制和工艺等方面进行多次改进,采取提高铁水温度,适当降低残留镁量等措施,但效果不大。经大家分析认为:这些黑点是由渣子形成的,
I produced the ductile iron cast iron roll pinch and roll surface often found pinholes and white spots, from the roller cross section can be directly observed in different sizes of black spots, the largest black spots diameter of 5 mm, located in various sections, Some roller cross-section of the black spot actually accounted for more than one-fifth of the cross-sectional area, seriously affecting the surface quality of rolled steel. To this end, we have made many improvements from raw materials, furnace control and process, etc., to take measures to improve the temperature of molten iron, reduce the amount of residual magnesium, but not effective. After analysis, we think: these black spots are formed by the slag,