Si-Mg-Fe alloy nodularizer

A nodulizer and iron alloy technology, applied in the field of silicon-magnesium iron alloy nodularizers, can solve the problems of increasing whitening tendency, fast solidification, large supercooling degree, etc., and achieve the effect of reducing whitening tendency, stable reaction and easy operation.

Inactive Publication Date: 2009-06-10
大连核心铸造技术工程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For small thin-walled parts, solidification is fast and supercooling is large, which is suitable for the growth of spherical graphite, and carbides are easy to appear at the same time, increasing the tendency of whitening

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1: a silicon-magnesium-iron alloy nodulizer, characterized in that the weight percent of each component of said nodulizer is: magnesium 15%; silicon 37%; the balance is iron. The above silicon-magnesium-iron alloy nodulizer also contains 8% nickel oxide by total weight.

Embodiment 2

[0014] Embodiment 2: a silicon-magnesium-iron alloy nodulizer, characterized in that the weight percent of each component of said nodulizer is: magnesium 5%; silicon 52%; the balance is iron. The above silicon-magnesium-iron alloy nodulizer also contains 5% nickel oxide by total weight.

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PUM

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Abstract

The invention relates to a silicon-magnesium ferroalloy nodulizer, which is characterized in that the nodulizer comprises the following compositions by weight percentage: 5 to 15 percent of magnesium, 37 to 52 percent of silicon, and the balance being iron. The nodulizer can give full play to the advantages of various spheroidizing elements, improve the spheroidizing effect, and meet the demands of different production conditions and different structural castings by adjusting the content of the spheroidizing elements, has stable reaction, is easy to operate, and makes spheroidization stable. Simultaneously, due to increased crystal nucleus, the grain size of the castings is finer, so that the nodulizer not only has the enhancing function but also can reduce the chilling tendency.

Description

technical field [0001] The invention relates to a silicon-magnesium-iron alloy nodulizer, which belongs to the technical field of metal grain treatment of nodular cast iron. Background technique [0002] As we all know, the production of ductile iron nodularizer is essential. For castings with different wall thicknesses and different weights, the selection of nodulizers is different because of their inconsistent solidification and cooling conditions. For small thin-walled parts, solidification is fast and supercooling is large, which is suitable for the growth of spherical graphite, and carbides are also easy to appear, which increases the tendency of whitening. Especially when the residual magnesium exceeds 0.068%, carbides are more likely to be produced. Therefore, it is generally advisable to use low rare earth and low magnesium nodulizers. For castings with a wall thickness above 120mm, due to the low solidification rate in the center of the casting, there is a phenom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10
Inventor 刘弘
Owner 大连核心铸造技术工程研究所
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