A kind of preparation method and application of nodular cast iron inoculant

A technology of nodular cast iron and inoculants, which is applied in the preparation of nodular cast iron inoculants, and in the application field of nodular cast iron, which can solve the problems of decreased hardness of nodular cast iron, increased white structure, and product instability, and achieves the increase of eutectic nuclei number, prolonging incubation time, and suppressing the effect of decay time

Active Publication Date: 2017-07-14
鹤壁瑞奇合金科技股份有限公司
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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

[0020] Embodiment 1 (preparation inoculant)

[0021] In terms of weight percentage, 66% Si, 10% Ba, 2% Ca, 1.8% Al, 1.5% Ce, 1% S and 17.7% Fe are mixed evenly and placed in a vacuum electric furnace. Replace the air in the furnace, heat up and smelt for 5 minutes, and keep stirring during the smelting process to mix the raw materials evenly, cool in vacuum to form a block, and crush the block into an alloy powder with an average particle size of 10 μm; the obtained alloy powder and the average 1.5% Fe by weight at a 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.

Embodiment 2

[0022] Embodiment 2 (preparation inoculant)

[0023] In terms of weight percentage, 72% Si, 3% Ba, 1% Ca, 0.8% Al, 2% Ce and 21.2% Fe are mixed evenly and placed in a vacuum electric furnace, and the air in the furnace is replaced with argon. Heating and smelting for 10 minutes, stirring continuously during the smelting process to mix the raw materials evenly, cooling in vacuum to form a block, crushing the block into alloy powder with an average particle size of 30 μm; 0.5% Fe by weight 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 μm.

Embodiment 3

[0024] Embodiment 3 (preparation inoculant)

[0025] By weight percentage, 68% Si, 8% Ba, 1.6% Ca, 1% Al, 1.6% Ce, 0.8% S and 19% Fe are mixed evenly and placed in a vacuum electric furnace. Replace the air in the furnace, heat up and smelt for 6 minutes, and keep stirring during the smelting process to mix the raw materials evenly, cool in vacuum to form a block, and crush the block into an alloy powder with an average particle size of 20 μm; the obtained alloy powder and the average 1% Fe by weight at a particle size of 20 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 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 μm.

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PUM

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Abstract

The invention discloses a preparation method of a nucleating agent for nodular cast iron. The method comprises the step that 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 and the balance Fe and inevitable micro elements are mixed, smelted, stirred, cooled and smashed; and then a mixture is mixed with Fe3O4 power to be pressed into a block to be smashed again. The invention further discloses application of the nucleating agent for nodular cast iron. By the adoption of the nucleating agent for the nodular cast iron, the comprehensive performance of the nodular cast iron can be improved, and the nucleating efficiency is improved.

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 Patents(China)
IPC IPC(8): C21C1/10
CPCC21C1/105
Inventor 韩岗马银强林志国
Owner 鹤壁瑞奇合金科技股份有限公司
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