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Inoculant for nodular cast iron flywheel shell and preparation method of inoculant

A ductile iron and inoculant technology, applied in the metallurgical field, can solve the problems of high carbon content and hardness, rapid inoculation recession, serious segregation, etc., and achieve the effect of improving the strength of the matrix, promoting the formation of ferrite, and having good dispersibility.

Pending Publication Date: 2021-11-26
XIANGYANG YUNWEI MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of 75SiFe inoculation decline fast, unstable effect, serious segregation, poor spheroidization effect, high carbon content and hardness, and provide a kind of spheroidal graphite cast iron flywheel shell production with good inoculation effect and inoculation decline A new type of inoculant that is slow and conducive to improving the uniformity of the structure, meets the performance requirements of the flywheel shell, and is also suitable for the production of other high-quality ductile iron castings

Method used

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  • Inoculant for nodular cast iron flywheel shell and preparation method of inoculant
  • Inoculant for nodular cast iron flywheel shell and preparation method of inoculant

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Effect test

Embodiment 1

[0029] The nodular cast iron inoculant used in the present invention contains the following components in weight percent: 70% silicon, 2% niobium, 0.5% yttrium, and the rest is Fe.

[0030] The above-described preparation method for nodular cast iron inoculant comprises the following specific steps:

[0031] S1. Weigh each raw material according to the proportion after drying;

[0032] S2, fully mixing the weighed raw materials at 1500°C and then sintering;

[0033] S3, adding the sintered inoculant into a ball mill for ball milling and mixing for 60 minutes, and pulverizing into a powder with an average particle size of about 500 μm;

[0034] S4. After passing the quality inspection, it is sealed and packaged for later use.

[0035] The above-described method for using the nodular cast iron inoculant comprises the following specific steps:

[0036] S1, drying the inoculant;

[0037] S2. After the molten iron is melted, the furnace temperature is 1500°C, and it is spheroid...

Embodiment 2

[0044] The inoculant used in the present invention for ductile iron contains the following components in weight percent: 65% silicon, 1% niobium, 0.2% yttrium, and the rest is Fe.

[0045] The above-described preparation method for nodular cast iron inoculant comprises the following specific steps:

[0046] S1. Weigh each raw material according to the proportion after drying;

[0047] S2, fully mixing the weighed raw materials at 1500°C and then sintering;

[0048] S3, adding the sintered inoculant into a ball mill for ball milling and mixing for 30 minutes, and pulverizing into a powder with an average particle size of about 400 μm;

[0049] S4. After passing the quality inspection, it is sealed and packaged for later use.

[0050] The above-described method for using the nodular cast iron inoculant comprises the following specific steps:

[0051] S1, drying the inoculant;

[0052] S2. After the molten iron is melted, the furnace temperature is 1520°C, and it is spheroidi...

Embodiment 3

[0058] The inoculant used for the ductile iron in the present invention contains the following components in weight percent: 60% silicon, 3% niobium, 0.5% yttrium, and the rest is Fe.

[0059] The above-described preparation method for nodular cast iron inoculant comprises the following specific steps:

[0060] S1. Weigh each raw material according to the proportion after drying;

[0061] S2, fully mixing the weighed raw materials at 1500°C and then sintering;

[0062] S3, adding the sintered inoculant into a ball mill for ball milling and mixing for 60 minutes, and pulverizing into a powder with an average particle size of about 600 μm;

[0063] S4. After passing the quality inspection, it is sealed and packaged for later use.

[0064] The above-described method for using the nodular cast iron inoculant comprises the following specific steps:

[0065] S1, drying the inoculant;

[0066] S2. After the molten iron is melted, the furnace temperature is 1510°C, and it is spheroi...

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Abstract

The invention discloses an inoculant for a nodular cast iron flywheel shell and a preparation method of the inoculant. The inoculant comprises the components in percentage by mass: 40-80% of silicon, 0.2-5% of niobium, 0.2-5% of yttrium and the balance iron, niobium and carbon in molten iron can form NbC, and the NbC serves as a heterogeneous core to promote precipitation of graphite nodules; and y has the effects of deoxidizing, purifying molten iron and improving the anti-spheroidizing degradation effect, and also has the anti-spheroidizing effect of neutralizing anti-spheroidizing elements Sb, Bi and the like, so that the number of the graphite nodules and the spheroidizing rate are increased. The preparation method of the inoculant comprises the steps that the prepared raw materials are fully mixed at the temperature of 1500 DEG C and then sintered into blocks, then the blocks are placed in a ball mill to be subjected to ball milling for 30-60 min and smashed into the inoculant with the average particle size being 400-600 micrometers, during pouring, and the inoculant with the mass fraction being 0.2-2% is added into molten iron to be subjected to stream inoculation. The inoculant is good in inoculation effect, the precipitated graphite nodules are small in particle size and uniform in distribution, and the obtained nodular cast iron flywheel shell is uniform in hardness and good in machinability.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to an inoculant for a nodular cast iron flywheel housing and a preparation method thereof. Background technique [0002] Ductile iron is a high-strength cast iron material with excellent performance and is widely used in various industries. Since the new century, with the development of technology and industrial progress, the performance requirements of ductile iron castings have gradually increased. How to improve ductile iron The quality of castings has once again aroused the interest of scientific researchers. At present, the methods to improve the performance of ductile iron mainly include inoculation treatment, heat treatment and alloying. Inoculation treatment is to refine the structure of ductile iron by increasing the nucleation sites in the melt. Reduce segregation and improve the mechanical properties and processing properties of castings. This method has the advantages...

Claims

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Application Information

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IPC IPC(8): C21C1/10C22C33/08B22D1/00B22C9/24C22C37/04C22C37/10
CPCC21C1/105C22C33/08B22D1/00B22C9/24C22C37/04C22C37/10
Inventor 魏子云吕书林郑力心
Owner XIANGYANG YUNWEI MACHINERY CO LTD
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