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Method for improving abrasion-resistant property of pig iron casting

A pig iron casting, wear-resistant technology, applied in pressure inorganic powder coating, coating, metal material coating technology and other directions, can solve problems such as performance damage of pig iron castings, improve wear resistance, improve hardness and strength , enhance the effect of tight bonding

Inactive Publication Date: 2019-01-01
含山县林头宝兴铸造厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in this invention, wear-resistant additives are added before pig iron casting. The addition of a large amount of wear-resistant additives will have a certain impact on the internal structure of pig iron castings, and will cause certain damage to various properties of pig iron castings. many questions

Method used

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  • Method for improving abrasion-resistant property of pig iron casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for improving the wear resistance of pig iron castings is characterized in that the specific steps are as follows:

[0022] 1) Put the pig iron to be cast into the smelting furnace, heat and melt it into molten iron, and heat it for 15 minutes. After the heat preservation is over, dephosphorize, desulfurize, and deoxidize the molten iron. Cast molten iron to obtain castings;

[0023] 2) Cool down the obtained casting to 1000°C, then preheat the nitrogen to 1200°C, spray the wear-resistant additive evenly on the surface of the casting with the hot nitrogen, after spraying the wear-resistant additive, spray the hot nitrogen to the surface of the casting Put the pretreated molten iron in step 1), then slowly cool the casting to 800°C, heat preservation for 2 hours, then water quench the casting, heat the quenched casting to 300°C for tempering, heat preservation for 3 hours, and obtain a semi-finished casting ;

[0024] 3) Add a small amount of wear-resistant ad...

Embodiment 2

[0032] A method for improving the wear resistance of pig iron castings is characterized in that the specific steps are as follows:

[0033] 1) Put the pig iron to be cast into the smelting furnace, heat and melt it into molten iron, and keep it warm for 17 minutes. After the heat preservation is over, dephosphorize, desulfurize, and deoxidize the molten iron. Cast molten iron to obtain castings;

[0034] 2) Cool down the obtained casting to 1050°C, then preheat the nitrogen to 1250°C, spray the wear-resistant additive evenly on the surface of the casting with the hot nitrogen, after spraying the wear-resistant additive, spray the hot nitrogen to the surface of the casting Add the pretreated molten iron in step 1), then slowly lower the temperature of the casting to 850°C, heat preservation treatment for 1.5h, then water quench the casting, raise the temperature of the quenched casting to 330°C for tempering, and heat preservation for 2.5h to obtain semi-finished castings;

...

Embodiment 3

[0043] A method for improving the wear resistance of pig iron castings is characterized in that the specific steps are as follows:

[0044] 1) Put the pig iron to be cast into the smelting furnace, heat and melt it into molten iron, and keep it warm for 20 minutes. After the heat preservation is over, dephosphorize, desulfurize, and deoxidize the molten iron. Cast molten iron to obtain castings;

[0045] 2) Cool down the obtained casting to 1100°C, then pre-heat the nitrogen to 1300°C, spray the wear-resistant additive evenly on the surface of the casting with the hot nitrogen, after spraying the wear-resistant additive, spray the hot nitrogen to the surface of the casting Add the pretreated molten iron in step 1), then slowly cool the casting to 900°C, heat preservation treatment for 1 hour, then water quench the casting, heat the quenched casting to 350°C for tempering, hold heat for 2 hours, and obtain a semi-finished casting ;

[0046] 3) Add a small amount of wear-resis...

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Abstract

The invention discloses a method for improving abrasion-resistant property of a pig iron casting. The method comprises the following steps of (1) heating pig iron, melting into hot metal, treating, and casting, so as to obtain a casting; (2) cooling the casting, spraying an abrasion-resistant additive to the surface of the casting along with hot nitrogen gas, spraying the pretreated hot metal to the surface of the casting along with hot nitrogen gas, cooling the casting, warming, quenching, and tempering, so as to obtain a semi-finished product of the casting; (3) adding the abrasion-resistantadditive into the pretreated hot metal, so as to obtain the modified abrasion-resistant hot metal; (4) heating the semi-finished product of the casting, spraying the abrasion-resistant additive to the surface of the casting along with the hot nitrogen gas, spraying the modified abrasion-resistant hot metal to the surface of the casting along with the hot nitrogen gas, cooling the casting, warming, quenching the casting, tempering, and naturally cooling to the room temperature. The method has the advantages that a plurality of abrasion-resistant barriers are sprayed to the surface of the pig iron casting; at the premises of no change of the internal structure of the pig iron casting, the abrasion-resistant property of the pig iron casting is improved, the practicality is improved, and thebroad application prospect is realized.

Description

technical field [0001] The invention belongs to the technical field of pig iron casting processing, and in particular relates to a method for improving the wear resistance of pig iron castings. Background technique [0002] Pig iron is an iron-carbon alloy with a carbon content greater than 2%. The carbon content of industrial pig iron is generally 2.11-4.3%, and contains C, Si, Mn, S, P and other elements. It is a product smelted with iron ore in a blast furnace. According to the different forms of carbon in pig iron, it can be divided into steelmaking pig iron, foundry pig iron and nodular cast iron. The performance of pig iron is hard, wear-resistant, and good castability, but pig iron is brittle and cannot be forged. [0003] my country is a developing country, and the demand for castings is increasing, but there is a big gap between castings and developed countries in terms of quality and quantity. Therefore, there is still a lot of room for development in my country'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/00C21C7/00C21D1/18C21D5/00C23C24/04C23C4/06
CPCC21C1/00C21C7/00C21D1/18C21D5/00C23C4/06C23C24/04
Inventor 张世宝
Owner 含山县林头宝兴铸造厂