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Production method of toughness nodular cast iron

A technology of ductile iron and a production method, applied in the field of foundry processing, can solve the problems of low forming efficiency, high production cost, reducing the carbon and silicon equivalent of cast iron, etc., and achieves improved fatigue resistance and wear resistance, improved structural strength and toughness, The effect of reducing internal stress concentration

Inactive Publication Date: 2018-06-29
WUHU JINMAO FLUID TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The furnace charge for the production of ductile iron is generally composed of newborn iron, returned ductile iron and ferroalloy. Scrap steel is rarely used in the furnace charge. In some factories, a small amount of scrap steel is added to the furnace charge to purify the molten iron and improve the purity of the molten iron. The mechanical properties of scrap steel in the charge are generally 0-10% by weight, which reduces the carbon content in molten iron, thereby reducing the carbon-silicon equivalent of cast iron, affecting the spheroidization rate and spheroidization grade of graphite, and resulting in The service performance and service life of ductile iron castings are greatly affected. At the same time, although the current ductile iron processing technology can meet the needs of workpiece processing operations to a certain extent, the production cost is relatively high and the casting process is complicated, which leads to the current ductile iron processing technology. Cast iron workpieces have poor casting precision, low molding efficiency, and defects such as pores and cracks are likely to remain inside the casting after molding. Therefore, it is urgent to develop a new nodular cast iron and its matching casting process to meet actual production needs

Method used

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  • Production method of toughness nodular cast iron

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Experimental program
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Effect test

Embodiment 1

[0021] like figure 1 Shown is a production method of toughness ductile iron, comprising the following steps:

[0022] The first step is to mix and smelt the raw materials. First, steel scrap, returned gray iron, ferrosilicon alloy, ferromanganese alloy and ferrotitanium alloy are added to the melting furnace in proportion, of which 15% is returned gray iron, 3% is ferrosilicon alloy, 5% is ferromanganese alloy, 4% ferro-titanium alloy, the rest is scrap steel, then the air in the melting furnace is discharged by argon gas and the air pressure in the melting furnace is kept constant at 3 standard atmospheric pressures, and then the melting furnace is heated to 1450°C until the raw materials in the melting furnace are all After the molten metal is stirred evenly in the molten state, the molten metal sample is taken from the furnace for composition gap analysis, and the content of the molten metal in the furnace is adjusted according to the composition analysis results. for 40 m...

Embodiment 2

[0031] like figure 1 Shown is a production method of toughness ductile iron, comprising the following steps:

[0032] The first step is to mix and smelt the raw materials. First, steel scrap, returned gray iron, ferrosilicon alloy, ferromanganese alloy and ferrotitanium alloy are added to the melting furnace in proportion, of which 15% is returned gray iron, 9% is ferrosilicon alloy, 4% is ferromanganese alloy, Titanium-iron alloy 3.5%, the rest is scrap steel, then the air in the melting furnace is discharged by argon gas and the air pressure in the melting furnace is kept constant at 1.5 standard atmospheres, and then the melting furnace is heated to 1550 °C until the raw materials in the melting furnace are all After the molten metal is stirred evenly in the molten state, the molten metal sample is taken from the furnace for composition gap analysis, and the content of the molten metal in the furnace is adjusted according to the composition analysis results. 15 minutes;

...

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Abstract

The invention relates to a production method of toughness nodular cast iron, which includes four steps of: mixing and smelting raw materials, performing metamorphic modification, performing modification and tempering, and performing tempering thermal treatment. In the invention, on one hand, by means of rare earth, the nodular cast iron which has uniform and continuous distribution and high hardness and is not reduced in ductility, is produced, wherein the structural strength and toughness of the nodular cast iron work piece are greatly improved; on the other hand, through metamorphic treatment, anti-fatigue performance and wear resistance of the nodular cast iron work piece are comprehensively improved; besides, by means of the casting method, defects, such as internal stress concentration, cracks and sand holes, in the nodular cast iron work piece are reduced effectively, thus improving the quality and structural strength of the nodular cast iron work piece.

Description

technical field [0001] The invention relates to a production method of strong ductile ductile iron, which belongs to the technical field of casting processing. Background technique [0002] The furnace charge for the production of ductile iron is generally composed of newborn iron, returned ductile iron and ferroalloy. Scrap steel is rarely used in the furnace charge. In some factories, a small amount of scrap steel is added to the furnace charge to purify the molten iron and improve the purity of the molten iron. The mechanical properties of scrap steel in the charge are generally 0-10% by weight, which reduces the carbon content in molten iron, thereby reducing the carbon-silicon equivalent of cast iron, affecting the spheroidization rate and spheroidization grade of graphite, and resulting in The service performance and service life of ductile iron castings are greatly affected. At the same time, although the current ductile iron processing technology can meet the needs o...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/10C22C37/08C22C33/08C21D5/00
CPCC21D5/00C22C33/08C22C37/04C22C37/08C22C37/10Y02P10/20
Inventor 孙述全孙雄骆伟祥
Owner WUHU JINMAO FLUID TECH CO LTD
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