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Casting method of high-matrix-hardness GM241 alloy gray iron

A technology of GM241 and matrix hardness, which is applied in the field of automobile mold cast iron, can solve the problems of alloy gray iron cracking and other problems, and achieve the effect of easy quenching

Inactive Publication Date: 2021-06-29
南通虹冈铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the graphite of the existing GM241 alloy gray iron still needs to be further refined to reduce the phenomenon of shrinkage and porosity of the casting, and the hardness of the matrix of the casting needs to be improved to reduce the cracking phenomenon of the GM241 alloy gray iron

Method used

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  • Casting method of high-matrix-hardness GM241 alloy gray iron
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  • Casting method of high-matrix-hardness GM241 alloy gray iron

Examples

Experimental program
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Effect test

Embodiment 1

[0037] see Figure 1-3 , a method for casting high matrix hardness GM241 alloy gray iron, comprising the following steps:

[0038] S1: GM241 alloy gray iron is composed of C: 3.0% ~ 3.2%, Si: 1.6% ~ 1.8%, Mn: 0.9% ~ 1.0%, P: ﹤0.06%, S﹤0.1%, Cu: 0.3% ~ 0.5%, Ni: 0.10%~0.15%, Mo: 0.4%~0.5% and Cr: 0.4%~0.5%, the percentage data is the percentage content of each element in the casting, that is: the weight of the element in the molten iron (kg) / The total weight of molten iron (kg) * 100% = percentage content; the graphite length of GM241 alloy gray iron is 50 ~ 70um, A-type graphite ≧ 90%, 90% means in the field of view of the microscope (×100 times), The ratio of the amount of type A graphite to the total number of graphite in the field of view, that is: the number of type A graphite / the total number of graphite in the field of view * 100% ≥ 90%; hardness 220 ~ 241HB, quenching hardness ≧ 52HRC, increase the proportion of type A graphite, refine the length of graphite , impr...

Embodiment 2

[0047] see figure 1 , a method for casting high matrix hardness GM241 alloy gray iron, comprising the following steps:

[0048] S1: GM241 alloy gray iron is composed of C: 3.0%, Si: 1.6%, Mn: 0.9%, P: 0.06%, S: 0.1%, Cu: 0.3%, Ni: 0.10%, Mo: 0.4% and Cr: 0.4 % composition, GM241 alloy gray iron graphite length 20um, A-type graphite 50%, hardness 220~241HB, quenching hardness≧52HRC;

[0049] S2: The molten iron is dissolved in an intermediate frequency induction furnace, and is fed into the furnace in the order of scrap, Si, starter block and scrap steel briquette. After the molten iron is melted, C, Mn, Cu, Ni, Mo, and Cr are added in batches;

[0050] S3: Sampling of molten iron, calculate the amount of alloy that needs to be added, and add the alloy to the electric furnace. After the molten iron in the electric furnace is completely dissolved, it is necessary to take multiple samples and analyze the composition of the sample. Until the standard is reached, then carry out h...

Embodiment 3

[0058] see figure 2 , a method for casting high matrix hardness GM241 alloy gray iron, comprising the following steps:

[0059] S1: GM241 alloy gray iron is composed of C: 3.0%, Si: 1.6%, Mn: 0.9%, P: 0.06%, S: 0.1%, Cu: 0.3%, Ni: 0.10%, Mo: 0.4% and Cr: 0.4 % composition, GM241 alloy gray iron graphite length 50um, A-type graphite 90%, hardness 220~241HB, quenching hardness≧52HRC;

[0060] S2: The molten iron is dissolved in an intermediate frequency induction furnace, and is fed into the furnace in the order of scrap, Si, starter block and scrap steel briquette. After the molten iron is melted, C, Mn, Cu, Ni, Mo, and Cr are added in batches;

[0061] S3: Sampling of molten iron, calculate the amount of alloy that needs to be added, and add the alloy to the electric furnace. After the molten iron in the electric furnace is completely dissolved, it is necessary to take multiple samples and analyze the composition of the sample. Until the standard is reached, then carry out ...

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Abstract

The invention discloses a casting method of high-matrix-hardness GM241 alloy gray iron. The casting method comprises the following steps that S1, the GM241 alloy gray iron is composed of 3.0%-3.2% of C, 1.6%-1.8% of Si, 0.9%-1.0% of Mn, less than 0.06% of P, less than 0.1% of S, 0.3%-0.5% of Cu, 0.10%-0.15% of Ni, 0.4%-0.5% of Mo and 0.4%-0.5% of Cr. According to the method, graphite is refined by prolonging the heat preservation time of molten iron and adopting a secondary inoculation method, the pearlite content is finally increased, the proportion of A-type graphite is increased, the length of the graphite is refined, the matrix hardness of a casting is improved, the matrix hardness is averagely improved by about 20 HB and is improved to 220-241 HB from original 197-220 HB, the casting is easier to quench, the quenching hardness reaches 52 HRC or above, and the casting is not prone to cracking in the quenching process.

Description

technical field [0001] The invention relates to the technical field of cast iron for automobile molds, in particular to a method for casting gray iron with high matrix hardness GM241 alloy. Background technique [0002] Cast iron is a Chinese term, which means cast iron-based alloys with a carbon content greater than 2%, containing silicon and a small amount of manganese, phosphorus, sulfur and other elements, cast iron-based alloys with a carbon content greater than 2%, and silicon and A small amount of manganese, phosphorus, sulfur and other elements, common white cast iron, gray cast iron, nodular cast iron, etc., low melting point, good fluidity, simple smelting, low cost, wear-resistant, but poor plasticity and toughness, low strength, general It is used to cast various castings. During the casting process, graphite forms are divided into A-type graphite, B-type graphite, C-type graphite, etc. The more grade A-type graphite, the better the product quality. A-type graphi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/08C22C33/08B22D1/00
CPCB22D1/007C22C33/08C22C37/08C22C37/10
Inventor 杨泽民吴伟
Owner 南通虹冈铸钢有限公司
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