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Preparation method of gray cast iron inoculant

A technology of inoculants and gray cast iron, which is applied in the field of preparation of gray cast iron inoculants, can solve the problems of poor dispersion of inoculants, affecting the quality of castings, and low mixing uniformity, so as to avoid inability to float and diverge, improve quality, and mix The effect of uniformity improvement

Active Publication Date: 2022-03-29
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing inoculant preparation process, the raw materials are usually directly smelted, poured, and then crushed to obtain inoculant particles. Adding inoculant particles to cast iron can significantly improve the strength and casting properties of gray cast iron, but in the application process, There is the problem of poor dispersion of inoculants in molten iron and low mixing uniformity with molten iron, which affects the quality of castings

Method used

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  • Preparation method of gray cast iron inoculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method of a gray cast iron inoculant, comprising:

[0045] Use chromium metal, chromium alloy, silicon calcium, phosphide, manganese metal, manganese compound, vanadium ferroalloy, vanadium compound, silicon barium alloy as raw material, the chemical composition mass percentage in the raw material is: Si 25%, Mn 20%, Cr 25% , C<0.10%, Ca1.5%, Ba 1.5%, N 1.2%, P<0.05%, S<0.02%, the rest is Fe;

[0046] Raw materials with a good ratio are smelted above 1500°C, filled with nitrogen as an inert gas for foaming, and the foamed material is obtained after foaming and cooling;

[0047] Break the foamed material into 1-2mm particles, and then place it in a closed container;

[0048] Evacuate the air in the airtight container, then fill it with nitrogen as an inert gas and pressurize to 0.5MPa;

[0049] Inject the molten film-forming agent into the airtight container so that the surface of the foaming material particles is coated with the film-forming agent, and the...

Embodiment 2

[0053] A preparation method of a gray cast iron inoculant, comprising:

[0054] Use chromium metal, chromium alloy, silicon calcium, phosphide, manganese metal, manganese compound, vanadium ferroalloy, vanadium compound, silicon barium alloy as raw material, the chemical composition mass percentage in the raw material is: Si 35%, Mn 10%, Cr 15% , C<0.10%, Ca1.5%, Ba 1.5%, N 0.8%, P<0.05%, S<0.02%, the rest is Fe;

[0055] Raw materials with a good ratio are smelted above 1500°C, filled with nitrogen as an inert gas for foaming, and the foamed material is obtained after foaming and cooling;

[0056] Break the foamed material into 1-2mm particles, and then place it in a closed container;

[0057] Evacuate the air in the airtight container, then fill it with nitrogen as an inert gas and pressurize to 0.2MPa;

[0058] Inject the molten film-forming agent into the airtight container so that the surface of the foaming material particles is coated with the film-forming agent, and t...

Embodiment 3

[0062] The difference from Example 1 is that the foaming process uses ultrasonic treatment for foaming and conventional gas filling for foaming, and other steps are the same. The differences are specifically:

[0063] Melt the mixed raw materials for 5 minutes at a temperature above 1500°C. Under protective measures, use ultrasonic equipment to directly sonicate the smelted raw materials, and at the same time inject nitrogen as an inert gas to make the smelted raw materials foam until they are cooled and solidified to obtain foamed materials. . The ultrasonic power of ultrasonic treatment is 50-80KHz, the inert gas is sprayed into the smelting raw material through the spray valve, and the injection frequency of the spray valve is above 100Hz, and the single injection volume is below 0.1uL.

[0064] In this embodiment, in the molten state of raw materials, ultrasonic treatment can produce cavitation effect and cause foaming. The inert gas introduced is contained in the foam. W...

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Abstract

The invention discloses a preparation method of a gray cast iron inoculant. The preparation method comprises the following steps: smelting proportioned raw materials, foaming and cooling to obtain a foaming material; crushing the foaming material into particles of 1-2mm, and then putting the particles into a closed container; air in the closed container is pumped out, then inert gas is filled, and the pressure is increased to 0.2 MPa or above; injecting a molten film-forming agent into the closed container, so that the surfaces of the foaming material particles are coated with the film-forming agent, and curing the film-forming agent to obtain a cured material; and crushing the cured material to obtain the gray pig iron inoculant with the particle size of 2-6mm. According to the preparation method, the foaming material particles have a thinner wall type and a hollow internal structure, when the foaming material particles are put into molten iron to be used as a nucleating agent, the foaming material particles can be more rapidly fused into the molten iron, the longer inoculation time is obtained, release of gas in the hollow structure can drive the nucleating agent to be rapidly dispersed in the molten iron, and therefore the foaming material particles are more stable in performance. And the mixing uniformity is improved, and the casting quality is improved.

Description

technical field [0001] The invention belongs to the technical field of gray cast iron, and more specifically, the invention relates to a preparation method of a gray cast iron inoculant. Background technique [0002] In the existing inoculant preparation process, the raw materials are usually directly smelted, poured, and then crushed to obtain inoculant particles. Adding inoculant particles to cast iron can significantly improve the strength and casting properties of gray cast iron, but in the application process, There is the problem of poor dispersion of the inoculant in the molten iron and low mixing uniformity with the molten iron, which affects the quality of the casting. Contents of the invention [0003] It is an object of the present invention to solve at least the above-mentioned disadvantages and to provide at least the advantages which will be described hereinafter. [0004] Another object of the present invention is to provide a preparation method of gray cas...

Claims

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Application Information

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IPC IPC(8): C22C35/00C22C30/00C22C1/08
CPCC22C35/00C22C35/005C22C30/00C22C28/00C22C38/34C22C38/38C22C38/004C22C38/002C22C38/001C22C33/06C22C1/08C22C1/083
Inventor 赖德斌林勇传李胜柱李伟柱何春华
Owner GUANGXI UNIV
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