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High-silicon-molybdenum vermicular graphite cast iron and production method thereof

A technology of vermicular graphite cast iron and production method, applied in the field of vermicular graphite cast iron, can solve the problems of insufficient tensile strength of large-displacement engines, low tensile strength of mechanical properties, and inability to meet customer requirements, etc., and achieves excellent casting performance, The effect of reducing the amount of pearlite and promoting the creeping phenomenon

Active Publication Date: 2016-03-09
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

However, the performance of vermicular graphite cast iron has a great relationship with the creep rate of vermicular graphite cast iron. The following problems often exist in the production of exhaust manifolds: 1. The metallographic creep rate is low and does not meet the requirements; 2. In the casting Graphite blooms in thick and large parts, which does not meet the requirements; 3. The mechanical properties and tensile strength are low, which cannot meet customer requirements
The elongation rate of the vermicular graphite cast iron of this invention has been improved, but the tensile strength is still not up to the requirements of large-displacement engines

Method used

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  • High-silicon-molybdenum vermicular graphite cast iron and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example provides a high-silicon-molybdenum vermicular graphite cast iron, the mass percentage of each component is: C: 3.13%, Si: 4.4%, Mn: 0.3%, P: 0.07%, S: 0.02%, Mo : 0.55%, Mg: 0.028%, Ca: 0.006%, Al: 0.04%, the balance is Fe and unavoidable trace elements.

[0028] The production method of above-mentioned high silicon molybdenum vermicular graphite cast iron, comprises the steps:

[0029] 1) Place the well-proportioned pig iron, recycled material, steel scrap, ferrosilicon and ferromolybdenum in an intermediate frequency induction furnace for smelting. After the temperature of the molten iron reaches 1450-1480°C, slag making and slag removal are carried out to ensure the purity of the molten iron;

[0030] 2) Control the temperature of the molten iron out of the furnace at 1530-1560 °C, use an electronic crane scale to lift the ladle at the furnace mouth to tap the iron, and the iron weight is 480-520kg;

[0031] 3) Add a mixed rare earth magnesium vermicula...

Embodiment 2

[0039] This example provides a high-silicon-molybdenum vermicular graphite cast iron, the mass percentage of each component is: C: 3.18%, Si: 4.47%, Mn: 0.3%, P: 0.07%, S: 0.02%, Mo : 0.6%, Mg: 0.033%, Ca: 0.007%, Al: 0.045%, the balance is Fe and unavoidable trace elements.

[0040] The production method of above-mentioned high silicon molybdenum vermicular graphite cast iron, comprises the steps:

[0041] 1) Place the well-proportioned pig iron, recycled material, steel scrap, ferrosilicon and ferromolybdenum in an intermediate frequency induction furnace for smelting. After the temperature of the molten iron reaches 1450-1480°C, slag making and slag removal are carried out to ensure the purity of the molten iron;

[0042] 2) Control the temperature of the molten iron out of the furnace at 1530-1560°C, use an electronic crane scale to lift the ladle at the furnace mouth to tap the iron, and the iron weight is 480-520kg;

[0043] 3) Add a mixed rare earth magnesium vermicula...

Embodiment 3

[0051] This example provides a high-silicon-molybdenum vermicular graphite cast iron, the mass percentage of each component is: C: 3.25%, Si: 4.54%, Mn: 0.3%, P: 0.07%, S: 0.02%, Mo : 0.65%, Mg: 0.038%, Ca: 0.008%, Al: 0.05%, the balance is Fe and unavoidable trace elements.

[0052] The production method of above-mentioned high silicon molybdenum vermicular graphite cast iron, comprises the steps:

[0053] 1) Place the well-proportioned pig iron, recycled material, steel scrap, ferrosilicon and ferromolybdenum in an intermediate frequency induction furnace for smelting. After the temperature of the molten iron reaches 1450-1480°C, 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 1530-1560°C, use an electronic crane scale to lift the ladle at the furnace mouth to tap the iron, and the iron weight is 480-520kg;

[0055] 3) Add a mixed rare earth magnesium vermicula...

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Abstract

The invention discloses high-silicon-molybdenum vermicular graphite cast iron. The high-silicon-molybdenum vermicular graphite cast iron comprises, by mass percent, 3.1%-3.4% of C, 4.3%-4.8% of Si, 0-0.3% of Mn, 0-0.07% of P, 0-0.02% of S, 0.5% to 0.75% of Mo, 0.025%-0.045% of Mg, 0.006%-0.01% of Ca, 0.04%-0.06% of Al and the balance Fe and inevitable microelements. A production method of the high-silicon-molybdenum vermicular graphite cast iron is further disclosed. Prepared materials are put into an electric furnace to be smelted. During ladle casting, a vermiculizer and a nucleating agent are added, and the performance of the cast iron can be improved. Carbide generated inside the cast iron is stable, the heat-resisting performance of the cast can be effectively improved, the creep ratio of the large-thick portion of the cast is improved to above 70%, the tensile strength is improved to 640 Mpa, the yield strength is improved to 570 Mpa, and the performance of the obtained casting is very excellent.

Description

technical field [0001] The invention relates to the technical field of vermicular graphite cast iron, in particular to a high-silicon-molybdenum vermicular graphite 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. The graphite form between flake and spherical graphite is called vermicular graphite cast iron. Since vermicular graphite cast iron has the properties of both ductile iron and gray cast iron, it has unique uses and has made great achievements in the application of ingot molds, automobile engines, exhaust pipes, glass molds, diesel engine cylinder heads, brake parts, etc. good effect. However, the performance of vermicular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C33/08C21C1/08B22D1/00
CPCB22D1/00C21C1/08C22C33/08C22C37/10
Inventor 刘松奇曹红磊杜斌彭德楼齐小军
Owner 西峡飞龙特种铸造有限公司
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