Nucleating agent containing rare earth and application of nucleating agent to spheroidal graphite cast iron smelting

Abstract

The invention discloses a nucleating agent containing rare earth. The nucleating agent is composed of the following components of the rare earth, lead, antimony, silicon, calcium, magnesium, aluminum and the balance iron and inevitable microelements. Application of the nucleating agent to spheroidal graphite cast iron smelting comprises three times of nucleation. Compared with the prior art, the nucleating agent has the following beneficial effects that the magnesium is added and combined with rare earth elements, so that alloy crystals have the more stable phase in a reaction and cannot be decomposed when coming across moisture or water, and the stability of the alloy crystals do not become poor along with the time; meanwhile, through multiple times of nucleation, mobility of molten iron can be improved, and the deoxidization effect of the molten iron is improved; and meanwhile, the remarkable effect on spherification and ferritiszation of spheroidal graphite is achieved and casting defects caused by much slag and cavity shrinkage can be effectively overcome.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an inoculant containing rare earth and its application in the smelting of ductile iron. Background technique [0002] Rare earth elements have special optical, electrical, magnetic and nuclear properties. Each rare earth element has its own characteristics, especially the rich electronic energy levels unique to rare earth elements. Its excellent optical, magnetic, electrical, acoustic and thermal properties can be developed New materials and devices with superior functional properties. [0003] Cast iron is a common and widely used iron-carbon alloy in castings. In order to obtain good mechanical properties of these castings, it is necessary to obtain an iron / graphite structure in the last stage, avoiding the formation of carbonization in the form of Fe3C that embrittles the alloy as much as possible Iron, the purpose of cast iron technology is to promote the appe...

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Problems solved by technology

[0003] Cast iron is a common and widely used iron-carbon alloy in castings. In order to obtain good mechanical properties of these castings, it is necessary to obtain an iron / graphite structure in the last stage, avoiding the formation of carbonization in the form of Fe3C that embrittles the alloy as much as possible Iron, the purpose of cast iron technology is to promote the appearance of graphite when the liquid cast iron is solidified. The faster the cast iron solidifies, the greater the probability of Fe3C appearing in the cast iron. The casting cast iron has been better treated, but the corresponding graphite ball density will increase, which will damage the consistency of the casting structure, resulting in its mechanical and stability being affected. In order to increase the stability of the grain, it is necessary to provide a kind of Effective inoculant ensures its stability

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