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Microalloying high-strength gray pig iron piece and smelting method thereof

A micro-alloying and high-strength technology, applied in the field of metal casting, can solve the problems of backward casting technology, high section sensitivity, low casting strength, etc., and achieve the effect of refining pearlite, avoiding coarse graphite and improving strength.

Active Publication Date: 2017-09-01
HANSHAN ZHAOXIA CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the main gap between my country and foreign countries in the research and production technology of high-strength gray cast iron is that the strength of castings is low. The castings produced by the same chemical composition of molten iron have a strength 1-2 grades lower than that of foreign grades; the casting process is backward, and the wall thickness of castings is large. , heavy weight, such as machine tool castings are more than 10% heavier than foreign ones, and engine cylinders are more than 30% heavier than foreign ones; automobile plates or engine cylinders made of castings have poor wear resistance, low life, high cross-section sensitivity, and low processing performance. Difference

Method used

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  • Microalloying high-strength gray pig iron piece and smelting method thereof

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Embodiment 1

[0029] A micro-alloyed high-strength gray iron casting, containing the following components in weight percentage: C 3.15%, Si 1.82%, Mn 0.5%, Cr 0.36%, Cu 0.74%, Nb 0.035%, V 0.08%, Ti 0.017%, the rest is iron and other unavoidable impurities.

[0030] The method for smelting the above-mentioned micro-alloyed high-strength gray iron castings comprises the following steps:

[0031] (1) Add charge and recarburizing agent into the hearth of the smelting furnace, heat up and melt;

[0032] (2) After the charge is completely melted, transfer it to the holding furnace, raise the temperature to 1450-1480°C and add ferromanganese alloy, ferrochrome alloy, niobium vanadium alloy, ferrosilicon alloy and metallic copper;

[0033] (3) After the alloy and metal copper are completely melted, continue to heat up to 1500-1520°C, and perform chemical composition analysis with a spectrometer. After the chemical composition analysis is qualified, heat up to 1550-1580°C, and keep at this tempera...

Embodiment 2

[0039] A micro-alloyed high-strength gray iron casting, containing the following components in weight percentage: C 2.92%, Si 2.15%, Mn 0.3%, Cr 0.5%, Cu 0.3%, Nb 0.011%, V 0.05%, Ti 0.025%, the rest is iron and other unavoidable impurities.

[0040] The method for smelting the above-mentioned micro-alloyed high-strength gray iron castings comprises the following steps:

[0041] (1) Add charge and recarburizing agent into the hearth of the smelting furnace, heat up and melt;

[0042] (2) After the charge is completely melted, transfer it to the holding furnace, raise the temperature to 1450-1480°C and add ferromanganese alloy, ferrochrome alloy, niobium vanadium alloy, ferrosilicon alloy and metallic copper;

[0043](3) After the alloy and metal copper are completely melted, continue to heat up to 1500-1520°C, and perform chemical composition analysis with a spectrometer. After the chemical composition analysis is qualified, heat up to 1550-1580°C, and keep at this temperatur...

Embodiment 3

[0049] A micro-alloyed high-strength gray iron casting, containing the following components in weight percentage: C3.48%, Si1.52%, Mn0.78%, Cr0.15%, Cu0.78%, Nb0.05%, V0.1% , Ti 0.02%, and the rest are iron and other unavoidable impurities.

[0050] The method for smelting the above-mentioned micro-alloyed high-strength gray iron castings comprises the following steps:

[0051] (1) Add charge and recarburizing agent into the hearth of the smelting furnace, heat up and melt;

[0052] (2) After the charge is completely melted, transfer it to the holding furnace, raise the temperature to 1450-1480°C and add ferromanganese alloy, ferrochrome alloy, niobium vanadium alloy, ferrosilicon alloy and metallic copper;

[0053] (3) After the alloy and metal copper are completely melted, continue to heat up to 1500-1520°C, and perform chemical composition analysis with a spectrometer. After the chemical composition analysis is qualified, heat up to 1550-1580°C, and keep at this temperatur...

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Abstract

The invention provides a microalloying high-strength gray pig iron piece and a smelting method thereof and relates to the field of metal casting. The gray pig iron piece comprises, by weight percent, 2.92%-3.48% of C, 1.52%-2.36% of Si, 0.22%-0.78% of Mn, 0.15%-0.5% of Cr, 0.3%-0.78% of Cu, 0.011%-0.098% of Nb, 0.02%-0.1% of V, 0.015%-0.025% of Ti and the balance iron and other traces of unavoidable impurities. A casting piece base body is intensified through microalloying, the intensity and the rigidity of the casting piece are improved, a high-efficiency nucleating agent is added, graphite form, hardness and texture uniformity can be effectively improved, the sensibility is reduced, the mechanical performance of the gray pig iron piece is improved, by adopting the in-mold inoculation manner, the utilization rate of the nucleating agent can be improved, the inoculation effect is improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of metal casting, in particular to a micro-alloyed high-strength gray iron casting and a melting method thereof. Background technique [0002] As a traditional metal material, gray cast iron occupies an important position in foundry production. Although the proportion of gray cast iron in the world's total cast iron production has declined in recent years, statistics show that gray cast iron still occupies an important position in iron castings. At present, under the situation of energy saving and consumption reduction and automobile lightweight on a global scale, gray cast iron materials can still be widely used, which is closely related to its good casting formability, high strength, wear reduction, shock absorption and low cost. Inseparable. [0003] At present, the main gap between my country and foreign countries in the research and production technology of high-strength gray cast iron is that the strength of ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/06C22C37/10C22C33/08
CPCC22C33/08C22C37/06C22C37/10
Inventor 黄远霞
Owner HANSHAN ZHAOXIA CASTING
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