Pure magnesium spheroidizing technology of lost foam ductile cast iron

A ductile iron and lost foam technology, applied in the field of foundry technology, can solve the problems of reduced process, unstable casting quality and high scrap rate

Active Publication Date: 2017-05-10
桃江新兴管件有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a pure magnesium spheroidization process of lost foam nodular cast iron, through which the pure magnesium spheroidization process of lost foam nodular cast iron can effectively solve the problem of spheroidization treatment of high-sulfur and high-silicon ir

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  • Pure magnesium spheroidizing technology of lost foam ductile cast iron
  • Pure magnesium spheroidizing technology of lost foam ductile cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Such as figure 1 As shown, first heat the subcontractor to ensure that the temperature of the cladding wall is above 700°C; put the spheroidizing agent into the subcontractor reaction chamber 1, close the reaction chamber cover, and add the conventional inoculant ferrosilicon into the subcontractor; The molten iron in the furnace is slag removed and added to the subcontractor. The temperature of the molten iron is controlled at 1520°C. The weight percentage concentration of various components in the molten iron in the holding furnace is: carbon 3.7%, silicon 1.3%, sulfur 0.08%, phosphorus 0.07%, Manganese 0.12%; cover the nozzle 2 with the cover 3, and then quickly transfer the bag at 90° for 5-10s to carry out the nodularization reaction. The reaction time of the nodulizer is 70s; The pouring is accompanied by flow inoculation, and the amount of flow inoculant added is 0.13% of the weight of molten iron; the nodulizer is a mixture of pure magnesium ingot and calcium ch...

Embodiment 2

[0018] First, heat the subcontractor to ensure that the temperature of the cladding wall is 700°C; put the spheroidizing agent into the subcontractor reaction chamber 1, close the reaction chamber cover, and add conventional inoculant ferrosilicon into the subcontractor; The slag is added to the subcontractor, and the height of the molten iron is about two-thirds of the volume of the subcontractor, and the temperature of the molten iron is controlled at 1560°C; the weight percentage concentration of various components in the molten iron in the holding furnace is: carbon 3.8% , 1.5% silicon, 0.09% sulfur, 0.08% phosphorus, 0.09% manganese; cover the bag mouth 2 with the bag cover 3, and then quickly transfer the bag at 90° for 5-10s to carry out the nodularization reaction, and the nodulizer reaction time is 60s; After the spheroidizing reaction is completed, pouring is carried out directly with a subcontractor, accompanied by inoculation with flow, and the amount of inoculant a...

Embodiment 3

[0020] First, heat the subcontractor to ensure that the temperature of the cladding wall is 700°C; put the spheroidizing agent into the subcontractor reaction chamber 1, close the reaction chamber cover, and add conventional inoculant ferrosilicon into the subcontractor; The slag is then added to the subcontractor, and the temperature of the molten iron is controlled at 1540°C; the weight percentage concentration of various components in the molten iron in the holding furnace is: carbon 4.0%, silicon 1.8%, sulfur 0.07%, phosphorus 0.06%, manganese 0.1%; Cover the bag nozzle 2 with the bag cover 3, and then quickly transfer the bag at 90° for 5-10s to carry out the nodularization reaction. The reaction time of the nodulizer is 65s; For inoculation with flow, the addition of inoculant with flow is 0.15% of the weight of molten iron; the nodulizer is a mixture of pure magnesium ingot and calcium chloride, and the weight ratio of molten iron: pure magnesium ingot: calcium chloride:...

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Abstract

The invention discloses a pure magnesium spheroidizing technology of lost foam ductile cast iron. The pure magnesium spheroidizing technology comprises the steps that a spheroidizing agent is placed into a lip-pour ladle reaction chamber, a cover of the reaction chamber is closed, and a conventional nucleating agent, ferrosilicon, is added into a lip-pour ladle; after molten iron in a heat-insulated furnace is subjected to deslagging, molten iron is added into the lip-pour ladle, and the temperature of molten iron is controlled to be 1520 DEG C to 1560 DEG C; then, the lip-pour ladle is overturned, and molten iron and the spheroidizing agent react for 60 s to 70 s; and pouring is carried out while stream inoculation is achieved, wherein the addition amount of the stream nucleating agent is 0.08% to 0.15% of the weight of molten iron; the spheroidizing agent is a mixture of pure magnesium ingots and calcium chloride; and the weight ratio of molten iron to the pure magnesium ingots to calcium chloride to ferrosilicon is 1000 to (1.4 to 2.0) to (0.2 to 0.5) to (4 to 8). According to the pure magnesium spheroidizing technology of lost foam ductile cast iron, the spheroidizing problem of high-sulfur high-silicon molten iron can be effectively solved, the spheroidizing grade is high, a required matrix structure can be obtained, the problems that the spheroidizing effect is poor, the quality of castings is not stable, and the rejection rate is high are solved, the technology does not require lip-pour ladle nucleating, the procedures can be decreased, and the labor intensity is reduced.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to a process for spheroidizing pure magnesium of lost foam nodular cast iron. Background technique [0002] Since the successful production of nodular cast iron in the 1950s, the nodular cast iron industry has made great progress in China. Due to its high strength, high toughness and low price, nodular cast iron occupies an important position in the material market. The production process of nodular cast iron includes the following links: smelting qualified molten iron, spheroidizing treatment, inoculation treatment, furnace inspection, pouring castings, casting cleaning, etc.; and spheroidizing treatment is the core technology of the smelting process. Badness directly determines the performance of castings. There has been a lot of research in recent years. Commonly used methods include flushing method, wire feeding method, blowing method, bell jar method, pressure method...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/10C22C33/10
CPCC22C33/10C22C37/04C22C37/10
Inventor 傅利符坚侯永先符耀光
Owner 桃江新兴管件有限责任公司
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