Spheroidizing and inoculating process for spheroidal graphite cast iron

Abstract

The invention discloses a spheroidizing and inoculating process for spheroidal graphite cast iron. The spheroidizing and inoculating process comprises the following steps that materials are prepared,wherein the total amount of a required nodulizing agent and a nucleating agent is determined according to the total amount of molten iron, and the nodulizing agent and the nucleating agent are dried;alloy is loaded into a ladle, wherein the nodulizing agent, the part of the nucleating agent and a covering agent are sequentially loaded into the ladle; spheroidizing is carried out, wherein part ofthe molten iron is quickly poured into the ladle, and the rest of the nucleating agent and the remaining molten iron are added when the spheroidization reaction approaches the tail sound; and the treatment is finished, wherein slagging is carried out after the spheroidizing treatment is finished, and floating silicon is added to inoculate and cover a heat preservation agent to be lifted to a pouring site after slagging. According to the spheroidizing and inoculating process, the molten iron is poured into the ladle twice, most of the molten iron is mixed with the nodulizing agent first, so that the molten iron poured into the ladle in advance is fully reacted with the nodulizing agent, then the rest molten iron is poured, and therefore the spheroidization effect can be effectively improved. The invention is applied to the field of casting.

Description

technical field [0001] The invention relates to the technical field of spheroidizing treatment of nodular cast iron, in particular to a spheroidizing and inoculation process of nodular cast iron. Background technique [0002] Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. The spheroidizing process is one of the important steps in the production of nodular iron. Due to the different methods in the spheroidizing process, the absorption rate of the molten iron to the nodularizing agent is different, which directly affects the nodularizing effect and the quality of the nodular iron. The key to control the spheroidization reaction is the absorption rate of the spheroidizer, and one of the factors that has the greatest impact on the absorption rate is the spheroidization reaction time. The effect is poor; if the spheroidizing temperature is appropriate, the reaction is stable, the time is long, the absorption...

AI Technical Summary

Problems solved by technology

Usually there is such a problem: because the molten iron is directly washed down, the instantaneous temperature in contact with the surface of the spheroidizer is too high, which intensifies the burning loss of the spheroidizer, and easily causes spheroidization recession, resulting in the scrapping of castings

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