Novel low-silicon low-rare-earth spheroidizing agent and preparation method

Abstract

The invention discloses a novel low-silicon low-rare-earth spheroidizing agent, and belongs to the technical field of casting. The novel low-silicon low-rare-earth spheroidizing agent is prepared fromthe following materials in parts by weight: 44-50 parts of silicon, 1.79-2.07 parts of calcium, 5-6.36 parts of magnesium oxide, 0.5-1.01 parts of aluminum, 0.009-0.051 part of titanium, 1.09-1.35 parts of manganese, 0.35-0.65 part of nickel, 0.9-1.65 parts of cerium oxide, 0.03-0.09 part of yttrium oxide and 0.06-0.1 part of rubidium oxide. By introducing a variety of rare earth elements, the spheroidization rate of the spheroidizing agent to graphite is improved, and the chill depth of the spheroidizing agent on cast iron can be reduced; and the spheroidizing agent can be effectively prevented from floating to the surface of molten iron and being burnt off by the synergistic effect of titanium, manganese and nickel, spheroidization is facilitated, and the strength, hardness and heat resistance of an alloy are improved.

Description

technical field [0001] The invention relates to a nodulizer, specifically a novel low-silicon and low-rare-earth nodulizer and a preparation method thereof, belonging to the technical field of casting. Background technique [0002] The spheroidizing process is a key technical link in the production of ductile iron castings. So far, nodularizers have played an irreplaceable role in the production of ductile iron. As we all know, the spheroidizing process is to convert flake carbon into spheres. When casting iron, it will contain 2-4 carbons, which will be tightly combined with iron. However, the form of these carbons in solidified cast iron is very important for cast iron Component performance is critical. [0003] If this carbon is in the form of iron carbide, the cast iron is known as white iron, which is hard and brittle and therefore of poor utility. If the carbon is in the graphite state, the cast iron is soft and easy to process. It is called gray cast iron and has s...

AI Technical Summary

Problems solved by technology

Although there are already a large number of nodulizer types in the prior art, starting from the factors such as saving cost, reducing the amount of silicon used, rever...