Nodular cast iron rare-earth magnesium silicon nodularizer

Abstract

The invention relates to a nodular cast iron rare-earth magnesium silicon nodularizer, comprising the following components by weight percent: 12-15% of Mg, 0.5-2.0% of Re, 42-50% of Si, 3.5-5.5% of Ca, 0.5-1.0% of Ba, 2.0-5.0% of Mn, 0.5-1.5% of C, less than 1.5% of Al, and the balance of Fe. The components are prepared into granules by a conventional mix-melting method and crushing, so as to obtain the nodular cast iron rare-earth magnesium silicon nodularizer. The nodularizer is in an irregular block shape; the grain size is 3-25mm or 5-40mm. According to the nodular cast iron rare-earth magnesium silicon nodularizer, the content of magnesium is improved; the spheroidisation cost can be significantly reduced; meanwhile, the nodular cast iron rare-earth magnesium silicon nodularizer is stable in spheroidisation quality and good in graphite ball roundness; the effects such as purification of molten iron, facilitation of graphitization, delaying of degraded spheroidization and facilitation of nucleation refined organization and the like can be achieved by adding Re, Ca, Ba, Mn and C.

Description

technical field [0001] The invention relates to the technical field of nodular cast iron, in particular to a rare earth magnesium silicon nodulizer for nodular cast iron. Background technique [0002] In the production process of ductile iron, spheroidizing treatment is an essential link. In the existing production in our country, the spheroidizing treatment generally adopts the spheroidizing agent flushing method. In the prior art, patent CN91108271.9 discloses an as-cast high-toughness nodular cast iron nodularizer, and patent CN91108270.0 discloses a as-cast high-strength nodular cast iron nodulizer. The above two patents are all about nodularizers The formula has been improved, and the spheroidizing effect is good, but the addition amount is large, and the cost of spheroidizing treatment is high. [0003] In addition, according to the search by the applicant, the patent CN00112456.0 discloses an as-cast high-strength nodular cast iron cored wire-type spheroidizer, and ...

AI Technical Summary

Problems solved by technology

However, due to the low melting point and boiling point of magnesium, when the spheroidizing agent is added, the rapid gasification of a large amount of magnesium will intensify the boiling of molten iron and reduce the absorption rate of magnesium, resulting in difficulty in controlling the spheroidizing process and unstable spheroidizing quality

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