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Nodulizing agent for nodular cast iron and preparation method thereof

A technology of nodular cast iron and nodularizers, which is applied in the field of nodularizers for nodular cast iron and its preparation, can solve the problems of unstable structure density of nodularizers, low absorption rate of effective elements, environmental pollution, etc., and achieve good social benefits The effect of improving the effective utilization rate and reducing the cost of use with economic benefits

Inactive Publication Date: 2021-03-16
WUHU GUODING MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, rare earth magnesium alloy is the most widely used nodulizer in China. The main problems of the nodulizer are: magnesium is easy to oxidize during the pouring process of the nodulizer, and the effective magnesium content in the nodulizer needs to be further increased. The tissue density is not stable; during the spheroidizing treatment, the magnesium element is oxidized and burned seriously, the absorption rate of effective elements is low, a large amount of white smoke is produced by the magnesium combustion, pollutes the environment, and the addition of nodulizers is relatively large. Faced with the above problems, this company The invention provides a nodularizer for ductile iron and its preparation method, and develops a high-quality nodulizer

Method used

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Examples

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Embodiment 1

[0019] This embodiment is a nodularizer for ductile iron, including Si: 40wt%, Re: 2.5wt%, Mg: 7.5wt%, Ca: 2%wt, Fe: 44%wt, Ce: 4%wt.

[0020] A kind of preparation method of nodularizing agent for ductile iron of the present invention comprises the following steps:

[0021] Step 1. Nodulizer smelting: first add Mg and Si to make Mg melt and then combine with Si to form Mg-Si phase, which always exists in Mg-Si phase during smelting and pouring, so as to reduce the effect of Mg oxidation and burning; At the initial stage of melting, the power of the intermediate frequency furnace is adjusted to 160kW. When the Mg ingot is completely melted, the power is adjusted to 100kW; 5 minutes after the furnace is turned on, the brazing is started; Until Fe and Ce are completely melted, the melting time of each furnace is controlled within 45 minutes to obtain molten metal;

[0022] Step 2. Pouring: Before pouring, put the pot body at the pouring position in front of the furnace body; pl...

Embodiment 2

[0030] This embodiment is a nodularizer for ductile iron, including Si: 44wt%, Re: 2.5wt%, Mg: 8.5wt%, Ca: 1%wt, Fe: 42%wt, Ce: 2%wt.

[0031] A kind of preparation method of nodularizing agent for ductile iron of the present invention comprises the following steps:

[0032] Step 1. Nodulizer smelting: first add Mg and Si to make Mg melt and then combine with Si to form Mg-Si phase, which always exists in Mg-Si phase during smelting and pouring, so as to reduce the effect of Mg oxidation and burning; At the initial stage of melting, the power of the intermediate frequency furnace is adjusted to 160kW. When the Mg ingot is completely melted, the power is adjusted to 100kW; 5 minutes after the furnace is turned on, the brazing is started; Until Fe and Ce are completely melted, the melting time of each furnace is controlled within 45 minutes to obtain molten metal;

[0033] Step 2. Pouring: Before pouring, put the pot body at the pouring position in front of the furnace body; pl...

Embodiment 3

[0041] This embodiment is a nodularizer for ductile iron, including Si: 43wt%, Re: 4.0wt%, Mg: 8wt%, Ca: 1%wt, Fe: 40%wt, Ce: 4%wt.

[0042] A kind of preparation method of nodularizing agent for ductile iron of the present invention comprises the following steps:

[0043] Step 1. Nodulizer smelting: first add Mg and Si to make Mg melt and then combine with Si to form Mg-Si phase, which always exists in Mg-Si phase during smelting and pouring, so as to reduce the effect of Mg oxidation and burning; At the initial stage of melting, the power of the intermediate frequency furnace is adjusted to 160kW. When the Mg ingot is completely melted, the power is adjusted to 100kW; 5 minutes after the furnace is turned on, the brazing is started; Until Fe and Ce are completely melted, the melting time of each furnace is controlled within 45 minutes to obtain molten metal;

[0044] Step 2. Pouring: Before pouring, put the pot body at the pouring position in front of the furnace body; plac...

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Abstract

The invention relates to the field of nodulizing agent preparation, in particular to a nodulizing agent for nodular cast iron and a preparation method thereof. The nodulizing agent for nodular cast iron comprises the following components in percentage by weight: 40-44wt% of Si, 2.5-4.0wt% of Re, 7.5-8.5wt% of Mg, 1-2wt% of Ca, 30-50wt% of Fe, and 1-4wt% of Ce. The preparation method comprises thefollowing steps: smelting the nodulizing agent: firstly adding Mg and Si; at a melting initial stage, adjusting power of a medium-frequency furnace to 160 kW, and adjusting the power to 100 kW after an Mg ingot is completely molten; starting rodding 5 minutes after opening the furnace; stopping rodding after furnace burden is completely molten, starting to stir until granular Si, Fe and Ce are completely molten, controlling melting time per melt to be 45 minutes to prepare molten metal; pouring the molten metal into a pot body; and crushing and screening after the molten metal in the pot bodyis completely cured and cooled. The nodulizing agent reduces burning loss of a magnesium element, increases an effective utilization rate of the magnesium element, reduces pollution, and is friendly to the environment.

Description

technical field [0001] The invention relates to the field of nodulizer preparation, in particular to a nodulizer for ductile iron and a preparation method thereof. Background technique [0002] Nodular cast iron is an important engineering material with excellent comprehensive performance, and it has been widely used in industry. At present, it is one of the most important means to obtain nodular cast iron when nodularizing agent is used for spheroidizing treatment. [0003] At present, rare earth magnesium alloy is the most widely used nodulizer in China. The main problems of the nodulizer are: magnesium is easy to oxidize during the pouring process of the nodulizer, and the effective magnesium content in the nodulizer needs to be further increased. The tissue density is not stable; during the spheroidizing treatment, the magnesium element is oxidized and burned seriously, the absorption rate of effective elements is low, a large amount of white smoke is produced by the mag...

Claims

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Application Information

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IPC IPC(8): C21C1/10C22C33/10
CPCC21C1/105C22C33/10
Inventor 俞家华
Owner WUHU GUODING MACHINERY MFG
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