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 oxidi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] This example is a spherocic agent for ductile iron, including Si: 40% by weight, RE: 2.5 wt%, mg: 7.5 wt%, Ca: 2% WT, Fe: 44% WT, CE: 4% WT.

[0020] The preparation method of a spheroidizing agent for the ink cast iron, including the following steps:

[0021] Step 1, the spherulating agent smelting: first add Mg, Si, and generate MG-Si phase after melting Mg, and is formed in a mg-Si phase in the smelting and casting process, achieving the effect of reducing mg oxidation burning; At the beginning of the melting, the medium band power is transferred to 160 kW. It is completely melted by the MG ingot. The power is adjusted to 100kw; 5 minutes after the furnace begins to brazing; after the furnace is completely melted, the insertion is stopped, then the stirring is started, until the granular Si, Fe, CE is completely melted, and the melting time of each furnace is controlled at 45min, and the metal solution is obtained;

[0022] Step 2: Pouring: Before the ...

Example Embodiment

[0029] Example 2

[0030] In this example, a spherocic agent for ductine cast iron comprising Si: 44 wt%, RE: 2.5 wt%, mg: 8.5 wt%, CA: 1% WT, Fe: 42% WT, CE: 2% WT.

[0031] The preparation method of a spheroidizing agent for the ink cast iron, including the following steps:

[0032] Step 1, the spherulating agent smelting: first add Mg, Si, and generate MG-Si phase after melting Mg, and is formed in a mg-Si phase in the smelting and casting process, achieving the effect of reducing mg oxidation burning; At the beginning of the melting, the medium band power is transferred to 160 kW. It is completely melted by the MG ingot. The power is adjusted to 100kw; 5 minutes after the furnace begins to brazing; after the furnace is completely melted, the insertion is stopped, then the stirring is started, until the granular Si, Fe, CE is completely melted, and the melting time of each furnace is controlled at 45min, and the metal solution is obtained;

[0033] Step 2: Pouring: Before the c...

Example Embodiment

[0040] Example 3

[0041] This example is a spherocic agent for ductile iron, including Si: 43 wt%, RE: 4.0% by weight, mg: 8 wt%, Ca: 1% wt, Fe: 40% wt, CE: 4% WT.

[0042] The preparation method of a spheroidizing agent for the ink cast iron, including the following steps:

[0043] Step 1, the spherulating agent smelting: first add Mg, Si, and generate MG-Si phase after melting Mg, and is formed in a mg-Si phase in the smelting and casting process, achieving the effect of reducing mg oxidation burning; At the beginning of the melting, the medium band power is transferred to 160 kW. It is completely melted by the MG ingot. The power is adjusted to 100kw; 5 minutes after the furnace begins to brazing; after the furnace is completely melted, the insertion is stopped, then the stirring is started, until the granular Si, Fe, CE is completely melted, and the melting time of each furnace is controlled at 45min, and the metal solution is obtained;

[0044] Step 2: Pouring: Before the ca...

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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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