STUDY ON NODULE RATIO AND COMPACTED GRAPHITE RATIO OF IRON FLUID TREATED BY RARE EARTH MAGNESIUM ALLOY QUICKLY EXAMINED BY CONCENTRATED DIFFERENCE FIXING OXYGEN

The article uses the method of regression statistics to obtain the regression formula of iron fluid nodule ratio Q and compacted graphite ratio R, through rare earth magnesium treatment. At the same time it has given thejudging figure of Q and R, considering oxygen activity and temperature. When using oxygen activity to judgenodule ratio and compacted graphite ratio of the ironfluid treated by rare earth magnesium alloy, its limit value changes with the change of temperature.