A rare earth magnesium nodulizer

Abstract

The invention discloses a rare earth-magnesium nodulizing agent. The rare earth-magnesium nodulizing agent comprises the following materials, by weight, of 60-62 parts of silicon, 3-5 parts of calcium, 6-8 parts of magnesium, 0.3-0.5 part of sulfur, 25-27 parts of iron, 1-3 parts of lanthanum, 0.2-0.4 part of gadolinium, 0.5-1.5 part of barium, 0.05-0.1 part of molybdenum, 0.05-0.1 part of cerium, 0.05-0.1 part of yttrium and 0.005-0.01 part of rubidium oxide. Through improvement and optimization for a composite-type rare earth-magnesium nodulizing agent formula, multiple elements with the synergistic effect are introduced, the nodulizing rate of the nodulizing agent for graphite is increased, and meanwhile the chill depth of the nodulizing agent for cast iron is decreased.

Description

technical field [0001] The invention relates to a nodulizer, in particular to a rare earth magnesium nodulizer for treating nodular cast iron. Background technique [0002] When casting iron, it will contain 2 to 4% carbon, which will be closely combined with iron, and the form of carbon in solidified cast iron is very important for the performance of cast iron. If this carbon is in the form of iron carbide, the cast iron is called white iron, which is hard and brittle and of poor practicality. If the carbon is in the graphite state, the cast iron is soft and easy to process, and it is called gray cast iron, which is practical. [0003] The graphite state can be divided into flake, dense and spherical, among which the spherical form can show the highest strength and the most ductile form of cast iron. During the solidification of cast iron, the additive that causes graphite to form a spheroid is called a spheroidizer. Usually, the pros and cons of nodulizers are measured ...

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