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Medium silicon molybdenum nodular cast iron and production method thereof

A technology of ductile cast iron and production method, which is applied in the field of ductile iron, can solve problems such as general nodularization effect, and achieve the effects of improving mechanical properties, reducing segregation, and eliminating whitening tendency

Inactive Publication Date: 2016-03-16
西峡飞龙特种铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention increases the content of silicon, and its wear resistance and strength are improved, but the spheroidization effect is mediocre when applied to complex workpieces

Method used

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  • Medium silicon molybdenum nodular cast iron and production method thereof
  • Medium silicon molybdenum nodular cast iron and production method thereof
  • Medium silicon molybdenum nodular cast iron and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a kind of medium-silicon-molybdenum ductile iron, the mass percentage of each component is: C: 3.15%, Si: 3.5%, Mn: 0.3%, P: 0.07%, S: 0.02%, Mo: 0.6%, Mg: 0.03, the balance is Fe and unavoidable trace elements.

[0030] The production method of above-mentioned silicon-molybdenum nodular cast iron comprises the steps:

[0031] 1) Place the proportioned pig iron, recycled material, scrap steel and ferromolybdenum in the medium frequency induction furnace for smelting. After the temperature of the molten iron reaches 1450-1480℃, slag making and slag removal are carried out to ensure the purity of the molten iron;

[0032] 2) Control the temperature of the molten iron out of the furnace at 1520-1540 °C, use an electronic crane scale to lift the ladle at the furnace mouth to tap the iron, and the iron weight is 490-510kg;

[0033] 3) Add a rare earth magnesium series nodulizer into the ladle for spheroidization treatment, and the added nodulizer is...

Embodiment 2

[0040] This embodiment provides a kind of medium-silicon-molybdenum ductile iron, the mass percentage of each component is: C: 3.18%, Si: 3.9%, Mn: 0.3%, P: 0.07%, S: 0.02%, Mo: 0.7%, Mg: 0.034, the balance is Fe and unavoidable trace elements.

[0041] The production method of above-mentioned silicon-molybdenum nodular cast iron comprises the steps:

[0042] 1) Place the proportioned pig iron, recycled material, scrap steel and ferromolybdenum in the medium frequency induction furnace for smelting. After the temperature of the molten iron reaches 1450-1480℃, slag making and slag removal are carried out to ensure the purity of the molten iron;

[0043] 2) Control the temperature of the molten iron out of the furnace at 1520-1540 °C, use an electronic crane scale to lift the ladle at the furnace mouth to tap the iron, and the iron weight is 490-510kg;

[0044] 3) Add a rare earth magnesium series nodulizer into the ladle for spheroidization treatment, and the added nodulizer i...

Embodiment 3

[0051] This embodiment provides a kind of medium-silicon-molybdenum ductile iron, the mass percentage of each component is: C: 3.22%, Si: 4.3%, Mn: 0.3%, P: 0.07%, S: 0.02%, Mo: 0.7%, Mg: 0.038, the balance is Fe and unavoidable trace elements.

[0052] The production method of above-mentioned silicon-molybdenum nodular cast iron comprises the steps:

[0053] 1) Place the proportioned pig iron, recycled material, scrap steel and ferromolybdenum in the medium frequency induction furnace for smelting. After the temperature of the molten iron reaches 1450-1480℃, slag making and slag removal are carried out to ensure the purity of the molten iron;

[0054] 2) Control the temperature of the molten iron out of the furnace at 1520-1540 °C, use an electronic crane scale to lift the ladle at the furnace mouth to tap the iron, and the iron weight is 490-510kg;

[0055] 3) Add a rare earth magnesium series nodulizer into the ladle for spheroidization treatment, and the added nodulizer i...

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Abstract

The invention discloses a medium silicon molybdenum nodular cast iron. The medium silicon molybdenum nodular cast iron comprises the following components in percentage by mass: 3.1-3.3% of C, 3-5% of Si, 0-0.3% of Mn, 0-0.07% of P, 0-0.02% of S, 0.5-1.2% of Mo, 0.025-0.045% of Mg, and the balance of Fe and inevitable microelements. The invention also discloses a production method of the medium silicon molybdenum nodular cast iron: putting the prepared materials into an electric furnace for smelting, and adding a nodulizing agent and a nucleating agent during ladle casting to improve the properties of the nodular iron. The production method of the medium silicon molybdenum nodular cast iron is capable of eliminating a chilling tendency caused by nodulized elements and thus obtaining a cementite-free carting, and further increasing graphite cores and the quantity thereof; besides, the production method has the advantages of reduction of a nodular diameter, uniform distribution, round shape, high graphite grade, refining of eutectic cells, reduction of segregation, improvement of mechanical properties of the casting; as a result, the quality of products is guaranteed.

Description

technical field [0001] The invention relates to the technical field of nodular cast iron, in particular to a medium-silicon-molybdenum nodular cast iron and a production method thereof. Background technique [0002] Cast iron is an iron-carbon alloy with a carbon content greater than 2.11%. It is obtained from industrial pig iron, scrap steel and other steel and its alloy materials through high-temperature melting and casting. In addition to Fe, it also contains carbon in other cast iron that is precipitated in the form of graphite. If the precipitated graphite is spherical, the cast iron is called nodular cast iron. Ductile iron castings have been used in almost all major industrial sectors, which require high strength, plasticity, toughness, wear resistance, resistance to severe thermal and mechanical shocks, high or low temperature resistance, corrosion resistance and dimensional stability. Especially in the technical field of exhaust manifolds of automobiles, the exhaus...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/08
Inventor 刘松奇杜斌曹红磊余嗣瑞刘书彦
Owner 西峡飞龙特种铸造有限公司
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