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Nodular cast iron inoculant, and preparation method and application thereof

A nodular cast iron and inoculant technology, applied in the field of inoculants, can solve the problems of short incubation time, white mouth, low hardness, etc.

Active Publication Date: 2014-12-10
成都宏源铸造材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most manufacturers use 75 ferrosilicon inoculant as the inoculant to produce ductile iron, but these products have shortcomings such as short incubation time, poor wear resistance, low hardness, low tensile strength, uneven cross-section, and easy to produce white spots. The product is unstable and cannot meet the requirements of some machine castings that require high hardness
[0005] In order to improve the above deficiencies, some manufacturers began to add other materials to the ferrosilicon inoculant to prepare composite inoculants, such as chromium, rare earth, etc. However, when adding the above materials, new problems will be introduced, such as increasing the formation of white structure. probability, which in turn leads to a decrease in the hardness of ductile iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 (preparation inoculant)

[0030] 60% by weight of Si, 6% of Zr, 2% of Ca, 1.4% of Al, 6% of Mn and 23.1% of Fe are mixed evenly and placed in an electric furnace, cast into blocks after remelting, and The block is pulverized into an alloy powder with an average particle size of 50 μm; the obtained above-mentioned alloy powder and an average particle size of 50 μm are 1.5% by weight of Fe 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 5% of the total weight of the powder is added together into a roller compacting device, pressed into agglomerates, and finally crushed to an average particle size of 200 μm.

Embodiment 2

[0031] Embodiment 2 (preparation inoculant)

[0032] 65% by weight of Si, 3.5% of Zr, 1% of Ca, 0.2% of Al, 1% of Mn and 28.8% of Fe are mixed evenly and placed in an electric furnace, cast into blocks after remelting, and The block is pulverized into an alloy powder with an average particle size of 100 μm; the obtained above-mentioned alloy powder and an average particle size of 100 μm are 0.5% by weight of Fe 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 3% of the total weight of the powder is added together into a roller compacting device to form agglomerates, and finally crushed to an average particle size of 500 μm.

Embodiment 3

[0033] Embodiment 3 (preparation inoculant)

[0034] 62% of Si, 5% of Zr, 2% of Ca, 1.2% of Al, 2% of Mn and 26.8% of Fe are mixed uniformly in the electric furnace, cast into blocks after remelting, and The block is pulverized into an alloy powder with an average particle size of 80 μm; the obtained above-mentioned alloy powder and an average particle size of 80 μm are 1% by weight of Fe 3 o 4 Add the powder into the mixing container and mix it with alloy powder and Fe 3 o 4 The sodium silicate solution with 3% of the total weight of the powder is added together into a roller compacting device to form agglomerates, and finally crushed to an average particle size of 300 μm.

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PUM

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Abstract

The invention discloses a nodular cast iron inoculant which comprises the following components in percentage by weight: 60-65% of Si, 3.5-6.0% of Zr, 1-2% of Ca, 0-1.4% of Al, 0.5-1.5% of Fe3O4, and the balance of Fe and inevitable minor elements. The nodular cast iron inoculant disclosed by the invention can improve the comprehensive properties of the nodular cast iron and enhance the inoculation efficiency.

Description

technical field [0001] The invention belongs to the technical field of inoculants, and in particular relates to a nodular cast iron inoculant and a preparation method, as well as the application of the inoculant in preparing nodular cast iron. Background technique [0002] The inoculant can promote graphitization, reduce the tendency of white mouth, improve the shape and distribution of graphite, increase the number of eutectic groups, refine the matrix structure, round the ductile iron graphite, reduce or eliminate chilling, and prevent free cementite on the surface Formation, uniform structure, improved mechanical properties and other advantages, it has been widely used in the field of cast iron. [0003] Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carbon steel. Ductile iron...

Claims

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Application Information

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IPC IPC(8): C22C33/08C21C1/10
Inventor 韩岗马银强林志国
Owner 成都宏源铸造材料有限公司
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