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Spheroidizing inoculation method of spheroidal graphite cast iron

A technology of nodular inoculation and nodular cast iron, which is applied in the field of casting, can solve the problems of unstable product quality and performance, inoculation decline, nodularization decline, etc., and achieve the effects of prolonging the effective time of inoculation, improving roundness, and reducing the tendency of whitening

Active Publication Date: 2018-10-09
佛山市高明康得球铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the two steps of spheroidization treatment and inoculation treatment, if the spheroidization inoculation method is not suitable, it is easy to cause the defects of spheroidization and inoculation decline, which will seriously affect the quality and performance of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A spheroidizing inoculation method of nodular cast iron, the steps are as follows:

[0024] Put a spheroidizing agent on one side of the bottom of the spheroidizing bag, cover a layer of silicon carbide powder on the spheroidizing agent, cover the first inoculant on the silicon carbide powder, and evenly cover the iron filings on the first inoculant, The top of the iron filings is evenly covered with perlite for casting and compacted; the molten iron is injected into the spheroidizing bag along the other side of the spheroidizing bag by the flushing method, and the temperature of the molten iron is 1420°C, and the spheroidizing treatment and inoculation treatment in the bag are carried out ; When the amount of molten iron poured into the spheroidizing bag accounts for 2 / 3 of the total mass of molten iron, add the second inoculant for inoculation treatment in the mold, and continue to pour in the remaining molten iron; add the third inoculant along with the flow while pou...

Embodiment 2

[0027] A spheroidizing inoculation method of nodular cast iron, the steps are as follows:

[0028] Put a spheroidizing agent on one side of the bottom of the spheroidizing bag, cover a layer of silicon carbide powder on the spheroidizing agent, cover the first inoculant on the silicon carbide powder, and evenly cover the iron filings on the first inoculant, The top of the iron filings is evenly covered with perlite for casting and compacted; the molten iron is injected into the nodularizing bag along the other side of the nodularizing bag by the flushing method, and the temperature of the molten iron is 1400°C, and the spheroidizing treatment and inoculation treatment in the bag are carried out ; When the amount of molten iron poured into the spheroidizing bag accounts for 2 / 3 of the total mass of molten iron, add the second inoculant for inoculation treatment in the mold, and continue to pour in the remaining molten iron; add the third inoculant along with the flow while pouri...

Embodiment 3

[0031] A spheroidizing inoculation method of nodular cast iron, the steps are as follows:

[0032]Put a spheroidizing agent on one side of the bottom of the spheroidizing bag, cover a layer of silicon carbide powder on the spheroidizing agent, cover the first inoculant on the silicon carbide powder, and evenly cover the iron filings on the first inoculant, The top of the iron filings is evenly covered with perlite for casting and compacted; the molten iron is injected into the nodularizing bag along the other side of the nodularizing bag by the flushing method. Inoculation treatment; when the amount of molten iron poured into the spheroidizing bag accounts for 2 / 3 of the total mass of molten iron, add the second inoculant for inoculation treatment in the mold, and continue to pour in the remaining molten iron; add it with the flow while pouring The third inoculant performs flow inoculation.

[0033] Wherein, the nodulizer accounts for 1.2% of the total mass of the molten iron...

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Abstract

The invention discloses a spheroidizing inoculation method of spheroidal graphite cast iron. The method comprises the following steps that a nodulizing agent is placed on one side of a spheroidized ladle bottom, a layer of silicon carbide powder is covered on the nodulizing agent, a silicon carbide powder covers the first nucleating agent, the scrap iron is uniformly covered on the first nucleating agent, and the upper surface of the scrap iron is uniformly covered with perlite for casting, and the perlite is tamped; molten iron is injected into a spheroidizing ladle along the other side of the spheroidizing ladle by adopting a pour-over process, wherein the temperature of the molten iron is 1400-1430 DEG C, and spheroidizing treatment and in-ladle inoculation treatment are carried out; when the amount of the poured molten iron in the nodulizing ladle accounts for 2 / 3 of the total mass of the molten iron, a second nucleating agent is added to carry out in-mold inoculation treatment, and the residual iron liquid is continuously poured; and a third nucleating agent is added to carry out metal-stream inoculation while the pouring is carried out. According to the method, the effect ofthe spheroidizing inoculation method is good, the spheroidal graphite cast iron obtained has high toughness, high strength and high spheroidization rate after the spheroidizing inoculation is carriedout.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a spheroidizing inoculation method of nodular cast iron. Background technique [0002] Ductile iron is a valuable high-strength cast iron material developed on the basis of gray cast iron. Due to the spherical distribution of graphite, ductile cast iron greatly reduces the splitting effect on the matrix, its mechanical properties are significantly improved compared with gray cast iron, and its comprehensive properties are close to those of steel. It is based on its excellent performance that it has been successfully used to cast some parts with complex stress and high requirements for strength, toughness and wear resistance. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. [0003] At present, in the production process of ductile iron, the material needs to be spheroidized and inoculated. The function of sphe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C21C1/10
CPCC21C1/105C22C33/10
Inventor 叶展亮
Owner 佛山市高明康得球铁有限公司