Preparation method and application of inoculant for nodular cast iron

A nodular cast iron and inoculant technology, applied in the field of nodular cast iron, the field of preparation of nodular cast iron inoculants, can solve the problems of decreased hardness of nodular cast iron, increase of white structure, short incubation time, etc., to increase the contact area , prolong the incubation time, and prevent the effects of gestation decline

Active Publication Date: 2016-01-06
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

[0025] Embodiment 1 (preparation inoculant)

[0026] By weight percentage, 66% Si, 10% Ba, 2% Ca, 1.8% Al, 1.5% Ce, 1% S, 0.5% recarburizer and 17.2% Fe are mixed evenly and put in In a vacuum electric furnace, replace the air in the furnace with argon, raise the temperature to 1300°C, and smelt for 5 minutes. Stir continuously during the smelting process to mix the raw materials evenly; pour in a container, and place the container in liquid nitrogen to make the alloy raw material Rapidly cool to room temperature to form a block, and the block is crushed into an alloy powder with an average particle size of 10 μm; 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 of 5% 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 50 μm. Wherein, the components of the recarburizer include: C: 99%, S: 0.4, moisture...

Embodiment 2

[0027] Embodiment 2 (preparation inoculant)

[0028] By weight percentage, 72% Si, 3% Ba, 1% Ca, 0.8% Al, 2% Ce, 1% recarburizer and 20.2% Fe are mixed evenly and placed in a vacuum electric furnace. Replace the air in the furnace with argon, raise the temperature to 1500°C, and smelt for 10 minutes. Stir continuously during the smelting process to mix the raw materials evenly; pour in a container, and place the container in liquid nitrogen to rapidly cool the alloy raw materials to room temperature. Form a block, crush the block into an alloy powder with an average particle size of 30 μm; the obtained above-mentioned alloy powder and an average particle size of 30 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 of 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 100 μ...

Embodiment 3

[0029] Embodiment 3 (preparation inoculant)

[0030] By weight percentage, 68% Si, 8% Ba, 1.6% Ca, 1% Al, 1.6% Ce, 0.8% S, 0.6% recarburizer and 18.4% Fe are mixed evenly and put into In a vacuum electric furnace, replace the air in the furnace with argon, raise the temperature to 1400°C, and smelt for 6 minutes. Stir continuously during the smelting process to mix the raw materials evenly; pour in a container, and place the container in liquid nitrogen to make the alloy raw material Cool rapidly to room temperature to form a block, and the block is crushed into an alloy powder with an average particle size of 20 μm; the above-mentioned alloy powder obtained and an average particle size of 1% 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 of 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 60...

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PUM

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Abstract

The preparation method comprises the following steps: uniformly mixing 66-72%% of Si, 3-10% of Ba, 1-2% of Ca, 0.8-1.8% of Al, 1.5-2% of Ce, 0-1% of S, 0.5-1% of a carburant and the balance of Fe and inevitable trace elements to obtain a mixture; smelting, cooling, pouring, quenching and crushing the mixture; mixing the mixture with Fe3O4 powder; and pressing, clustering and crushing the mixture and the Fe3O4 powder. The invention further discloses an application of the inoculant for nodular cast iron. The inoculant for for nodular cast iron provided by the invention can be adopted to improve comprehensive properties of the for nodular cast iron, and improves inoculation efficiency.

Description

technical field [0001] The invention relates to the field of cast iron, in particular to a preparation method of an inoculant for ductile iron and its application in the field of ductile 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 is a high-strength cast iron material developed in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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