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High-strength inoculated casting and manufacturing method thereof

A high-strength, high-strength casting technology, applied in the field of high-strength inoculated castings and its manufacturing, can solve the problems that cupolas are not suitable for smelting high-strength castings, castings are easy to deform, and high-strength castings have high manufacturing costs. It is beneficial to environmental protection and reduces castings Good effect on deformation and cutting performance

Active Publication Date: 2014-01-01
南京德惠新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-strength inoculated casting and its manufacturing method, which overcomes the obstacle that the cupola is not suitable for smelting high-strength castings, solves the high manufacturing cost of high-strength castings in the prior art, and the castings containing ferromanganese and ferrosilicon are easy to produce. deformation problem

Method used

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  • High-strength inoculated casting and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) First add 300kg of bottom coke into the cupola, turn on the blower, and when the temperature of the dome rises to 150°C and the furnace temperature reaches 750°C, first add 30kg of limestone, 300kg of 22# foundry pig iron, 150kg of scrap steel, and 550kg of mechanical waste pig iron , high manganese pig iron 30kg, foundry coke 150kg;

[0043] (2) When the temperature of the molten iron reaches 1470°C, take 0.7kg of 75# ferrosilicon particles with a diameter of 0.3cm and put them into a large ladle for inoculation treatment, and use the molten iron analyzer in front of the furnace to analyze the molten iron Chemical analysis to adjust the composition of molten iron to achieve the composition content index of castings;

[0044] (3) Casting shape:

[0045] a. Sand blending: according to the ratio of kg, put 300kg of quartz sand, 600kg of reclaimed sand, 60kg of bentonite, 50kg of coal powder, and add water into the sand mixer to mix the sand;

[0046] b. Modeling: Us...

Embodiment 2

[0051] (1) First add 300kg of bottom coke into the cupola, turn on the blower, and when the temperature of the dome rises to 150°C and the furnace temperature reaches 750°C, first add 30kg of limestone, 300kg of 22# foundry pig iron, 150kg of scrap steel, and 550kg of mechanical waste pig iron , high manganese pig iron 40kg, foundry coke 175kg;

[0052] (2) When the temperature of the molten iron reaches 1520°C, take 0.85kg of 75# ferrosilicon particles with a diameter of 0.3cm and put them into a large ladle for inoculation treatment, and use the molten iron analyzer in front of the furnace to analyze the molten iron Chemical analysis to adjust the composition of molten iron to achieve the composition content index of castings;

[0053] (3) Casting shape:

[0054] a. Sand blending: according to the ratio of kg, put 300kg of quartz sand, 600kg of reclaimed sand, 60kg of bentonite, 50kg of coal powder, and add water into the sand mixer to mix the sand;

[0055] b. Modeling: U...

Embodiment 3

[0060] (1) First add 300kg of bottom coke into the cupola, turn on the blower, and when the temperature of the dome rises to 150°C and the furnace temperature reaches 750°C, first add 30kg of limestone, 300kg of 22# foundry pig iron, 150kg of scrap steel, and 550kg of mechanical waste pig iron , high manganese pig iron 50kg, foundry coke 200kg;

[0061] (2) When the temperature of the molten iron reaches 1570°C, take 1kg of 75# ferrosilicon particles with a diameter of 0.3cm and put them into a large ladle for inoculation treatment, and use the molten iron analyzer in front of the furnace to chemically analyze the molten iron. Analysis to adjust the components in the molten iron to achieve the component content index of the casting;

[0062] (3) Casting shape:

[0063] a. Sand blending: according to the ratio of kg, put 300kg of quartz sand, 600kg of reclaimed sand, 60kg of bentonite, 50kg of coal powder, and add water into the sand mixer to mix the sand;

[0064] b. Modelin...

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Abstract

The invention discloses a high-strength inoculated casting and a manufacturing method thereof. The manufacturing method mainly comprises the following steps: (1) selection and proportioning of raw materials; (2) ball milling and stirring; (3) casting; (4) static primary curing, vapor recovery and waste heat reutilization; (5) demolding and cutting; and (6) autoclaved curing. According to the invention, a cupola furnace can be utilized to smelting high-strength cast iron, wherein the tapping temperature of molten iron is defined to 1470-1570, and the effect is good; the proportions of scrap steel and scrap machine iron are enhanced in the raw materials; a C-Si inoculator technique can be utilized to obtain an HT250 pig iron casting under the condition that CE is less than 2.7%; and the method has the advantages of reasonable raw material proportioning and low cost, solves the technical problems of high deformation tendency and insufficient hardness in the casting, recycles the resources, and is beneficial to environmental protection. The high-strength inoculated casting has the advantages of high strength, excellent elastic modulus and excellent wear resistance, and is a good material for reducing the casting deformation.

Description

technical field [0001] The invention relates to a high-strength inoculated casting and a manufacturing method thereof. Background technique [0002] In recent years, with the improvement of casting quality requirements for machinery, metallurgy, textile and other industries, the demand for medium and high strength castings has increased sharply. After my country's accession to the WTO, it will become a major exporter of castings, and this demand will further increase. At present, there are two main methods for the production of high-strength castings in my country: one is to reduce the carbon content of the original molten iron and strengthen inoculation; the other is to add trace alloy elements. The high carbon equivalent of high-strength castings, especially the high carbon content, is a necessary condition to ensure that the castings have excellent casting performance, shock absorption performance, friction reduction performance and cutting performance. Reducing the carb...

Claims

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Application Information

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IPC IPC(8): C21C1/08C22C33/08C22C37/10
Inventor 苟坤常
Owner 南京德惠新材料科技有限公司
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