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Degradated-spheroidization-resisting composite inoculant and preparation technology of composite inoculant

A compound inoculant, mass percentage technology, applied in the field of inoculants, can solve the problems of spheroidization recession, poor spheroidization, and the failure of ductile iron castings to achieve mechanical properties, to improve the structure, improve the roundness, and reduce the return rate. Effect of sulfur phenomenon

Inactive Publication Date: 2018-02-23
南京浦江合金材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nodularization decline and poor nodularization make the ductile iron casting fail to meet the specified mechanical properties and be scrapped

Method used

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  • Degradated-spheroidization-resisting composite inoculant and preparation technology of composite inoculant
  • Degradated-spheroidization-resisting composite inoculant and preparation technology of composite inoculant
  • Degradated-spheroidization-resisting composite inoculant and preparation technology of composite inoculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This example provides a compound inoculant for anti-spheroidization decline. The components of the compound inoculant are Si: 55%, Ca: 1.0%, Ba: 4.0%, Mg: 0.5%, RE: 0.1% by mass percentage , Al: 1.0%, balance Fe;

[0036] The preparation technology of composite inoculant is carried out according to the following steps:

[0037] Step 1: Prepare the raw materials first, test the components of the required raw materials, and then weigh them according to the proportion of the components of the compound inoculant;

[0038] Step 2: First add ferrosilicon with high iron content to the medium frequency induction furnace, and then add other metals with low iron content and no iron;

[0039] Step 3: Adjust the voltage of the intermediate frequency induction furnace to 300V and the current to 400A, and then heat and melt the raw materials. The heating time is 45 minutes, and the temperature is 1200°C. After the intermediate frequency induction furnace is completely melted, manual...

Embodiment 2

[0044] This example provides a composite inoculant for anti-spheroidization decline. The components of the composite inoculant are: Si: 65%, Ca: 2.0%, Ba: 6.0%, Mg: 2.0%, RE: 1.5 %, Al: 1.5%, balance Fe;

[0045] The preparation technology of composite inoculant is carried out according to the following steps:

[0046] Step 1: Prepare the raw materials first, test the components of the required raw materials, and then weigh them according to the proportion of the components of the compound inoculant;

[0047] Step 2: First add ferrosilicon with high iron content to the medium frequency induction furnace, and then add other metals with low iron content and no iron;

[0048]Step 3: Adjust the voltage of the intermediate frequency induction furnace to 500V and the current to 640A, and then heat and melt the raw materials. The heating time is 60 minutes, and the temperature is 1250°C. After all the materials of the intermediate frequency induction furnace are melted, manual stirr...

Embodiment 3

[0053] This example provides a composite inoculant for anti-spheroidization decline. The components of the composite inoculant are: Si: 60%, Ca: 1.7%, Ba: 5.0%, Mg: 1.2%, RE: 1.1 %, Al: 0.8%, balance Fe;

[0054] The preparation technology of composite inoculant is carried out according to the following steps:

[0055] Step 1: Prepare the raw materials first, test the components of the required raw materials, and then weigh them according to the proportion of the components of the compound inoculant;

[0056] Step 2: First add ferrosilicon with high iron content to the medium frequency induction furnace, and then add other metals with low iron content and no iron;

[0057] Step 3: Adjust the voltage of the intermediate frequency induction furnace to 400V and the current to 550A, and then heat and melt the raw materials. The heating time is 50 minutes, and the temperature is 1230°C. After all the materials of the intermediate frequency induction furnace are melted, manual stir...

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Abstract

The invention discloses a degradated-spheroidization-resisting composite inoculant. The composite inoculant comprises the following components of, by mass percent, 55-65% of Si, 1.0-2.0% of Ca, 4.0-6.0% of Ba, 0.5-2.0% of Mg, 0.1-1.5% of RE, 1.5max% of Al and the balance Fe. According to the degradated-spheroidization-resisting composite inoculant, the nodularization effect can be improved, graphite nodules are refined, the quantity of the graphite nodules is increased, the roundness of the graphite nodules is improved, the graphite nodules are distributed uniformly, the degradated spheroidization is lowered, the effective inoculation time is prolonged, and the mechanical properties of nodular iron castings are further improved, the production cost is lowered, and the quality of nodular cast iron is improved.

Description

technical field [0001] The invention relates to an inoculant, in particular to a composite inoculant for anti-spheroidization decline and a preparation process thereof. Background technique [0002] Ductile iron is a valuable high-strength cast iron material developed on the basis of gray cast iron. Due to the spherical distribution of graphite, ductile cast iron greatly reduces the splitting effect on the matrix, its mechanical properties are significantly improved compared with gray cast iron, and its comprehensive properties are close to those of steel. It is based on its excellent performance that it has been successfully used to cast some parts with complex stress and high requirements for strength, toughness and wear resistance. Ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and is widely used. [0003] Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C33/08C22C37/04
CPCC21C1/105C22C33/08C22C37/04
Inventor 任启才田毅菲段清忠沈乐刘英陈刘剑赵战
Owner 南京浦江合金材料股份有限公司
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