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Preparation method of high strength and high hardness spheroidal graphite cast iron

A ductile iron, high-hardness technology, applied in the metallurgical industry, can solve problems such as difficulty in production, and achieve the effects of enhancing the uniformity and stability of dispersion, improving competitiveness, and high material hardness

Inactive Publication Date: 2020-09-22
东亚科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general actual production, a bag of molten iron needs to pour multiple boxes of castings. It usually takes about 6 to 8 minutes from the start of molten iron to pouring of the first box of castings, and the rest of the castings are poured during the remaining incubation time. is hard to do

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Calculate the amount of raw materials according to the proportion and prepare the materials; clean up the melting furnace; add 100 parts of returned iron, 100 parts of graphite steel, and 10 parts of ferrosilicon alloy into the melting furnace together in parts by weight, and then heat the melting furnace to 1500 ℃, until the raw materials in the melting furnace are in a molten state and stirred evenly, the molten metal sample is cooled from the melting furnace for component analysis, and the component content of the molten metal in the melting furnace is adjusted according to the component analysis results until the chemical composition of the molten metal reaches After the request, carry out static heat preservation, and the heat preservation time is 25 minutes;

[0027] 2) Blow 3 parts of modifier silicon carbide micropowder into the smelting furnace, and fully stir the modifier and molten metal in the smelting furnace evenly, and then keep it for 10 minutes;

[0...

Embodiment 2

[0036] 1) Calculate the amount of raw materials according to the ratio and prepare the materials; clean the melting furnace; add 100 parts of returned iron, 100 parts of graphite steel, and 30 parts of ferrosilicon alloy to the melting furnace, and then heat the melting furnace to 1530 ℃, until the raw materials in the melting furnace are in a molten state and stirred evenly, the molten metal sample is cooled from the melting furnace for component analysis, and the component content of the molten metal in the melting furnace is adjusted according to the component analysis results until the chemical composition of the molten metal reaches After the request, carry out static heat preservation, and the heat preservation time is 20 minutes;

[0037] 2) Blow 5 parts of modifier silicon carbide micropowder into the smelting furnace, and fully stir the modifier and molten metal in the smelting furnace evenly, and then keep it for 10 minutes;

[0038] 3) Pretreatment, take 5 parts of ...

Embodiment 3

[0046] 1) Calculate the amount of raw materials according to the ratio and prepare the materials; clean the melting furnace; add 100 parts of returned iron, 100 parts of graphite steel and 20 parts of ferrosilicon alloy to the melting furnace together by weight, and then heat the melting furnace to 1520 ℃, until the raw materials in the melting furnace are in a molten state and stirred evenly, the molten metal sample is cooled from the melting furnace for component analysis, and the component content of the molten metal in the melting furnace is adjusted according to the component analysis results until the chemical composition of the molten metal reaches After requesting, carry out static heat preservation, and the heat preservation time is 23 minutes;

[0047] 2) Blow 4 parts of modifier silicon carbide micropowder into the smelting furnace, and fully stir the modifier and molten metal in the smelting furnace evenly, and then keep it for 12 minutes;

[0048] 3) Pretreatment,...

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Abstract

The invention belongs to the field of metallurgical industry and in particular relates to a preparation method of high strength and high hardness spheroidal graphite cast iron. The preparation methodcomprises the preparation steps of 1) calculating raw material amounts in proportion and preparing raw materials; 2) blowing a modifier into a smelting furnace, wherein the modifier and molten metal in the smelting furnace are fully and uniformly stirred, and leaving the mixture to stand and keeping the temperature; 3) casting ladle pre-treatment: paving a first nucleating agent on the outer surface of a spheroidizing agent and then paving a dregs remover on the outer surface of the first spheroidizing agent for spheroidizing treatment and first time nucleation; adding a second nucleating agent after drossing for second time nucleation and adding a nitrogen getter for quenching and tempering treatment; 4) carrying out casting to obtain a prefabricated part; and 5) carrying out thermal treatment. The technical scheme of the invention has the technical advantages that the prepared spheroidal graphite cast iron with high tensile strength and high material hardness is obtained as well under a circumstance that alloys such as Mo, Ni and V high in price are avoided, the production cost is lowered greatly, and the market competitiveness of a product is improved.

Description

technical field [0001] The invention belongs to the field of metallurgical industry, and in particular relates to a preparation method of high-strength and high-hardness nodular cast iron. Background technique [0002] Ductile iron is widely used in machine tool castings. Machine tool casting products require materials with good tensile strength and high material hardness due to their use characteristics. In the existing technology, when producing high-strength and high-hardness ductile iron, Cu, Mo, Ni, V, Ti, Cr and other elements are usually added to improve the strength and hardness of ductile iron, which has become the first choice for many foundry companies However, while this solution increases the tensile strength and material hardness of the ductile iron, it will also lead to the deterioration of the machining performance of the ductile iron, the prolongation of the machining time, and the sharpening and beating of knives often occur during the machining process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/08C21C1/10C21D5/00
CPCC21C1/105C21D5/00C22C33/08C22C37/04C22C37/10
Inventor 钱东方钱振杰宋德锋梁晓民唐少春吴波
Owner 东亚科技(苏州)有限公司
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