Vanadium-titanium nodular cast iron smelting method

A technology of nodular cast iron and vanadium-titanium, which is applied in the field of smelting vanadium-titanium nodular cast iron, can solve problems such as increasing whitening tendency, and achieve the effects of low cost, reduced production cost, and convenient operation

Inactive Publication Date: 2015-05-20
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the spheroidization effect, adding a small amount of Re to inhibit the despheroidization of Ti must ensure the residual rare earth content, but increase the whitening tendency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for smelting vanadium-titanium ductile iron, which includes weighing furnace charges, smelting, spheroidizing and inoculating, using a 50Kg medium-frequency induction furnace for smelting, and the furnace materials used are as follows: 60% of vanadium-titanium pig iron, 35% of scrap steel, and the rest are ferrosilicon and Ferromanganese, etc.; during the smelting step, add iron oxide scales in an amount of 1% of the weight of the charge to the furnace charge, and the oxide scales are added to the bottom of the charge when smelting and charging; the oxide scales make the molten iron Titanium is preferentially oxidized and has no obvious effect on the content of other elements, thereby reducing the titanium content, weakening the anti-graphite spheroidization effect of titanium, and ensuring the graphite spheroidization in vanadium-titanium ductile iron. dephosphorization. After the charge is melted, add a certain amount of ferrosilicon to the molten iron to mak...

Embodiment 2

[0027] A method for smelting vanadium-titanium ductile iron, which includes weighing furnace charge, smelting, spheroidizing treatment and inoculation treatment, using a 50Kg medium-frequency induction furnace for smelting, and the furnace charge used is as follows: 60% of vanadium-titanium pig iron, 35% of vanadium-titanium cast iron return charge, and the rest It is ferrosilicon and ferromanganese, etc.; during the smelting step, add iron oxide scales in an amount of 0.5% of the weight of the charge into the furnace charge, and the iron oxide scales are added to the bottom of the charge during smelting; In the middle, the titanium in the hot metal is preferentially oxidized and has no obvious effect on the content of other elements, thereby reducing the titanium content, weakening the anti-graphite spheroidization effect of titanium, and ensuring the graphite spheroidization in the vanadium-titanium nodular iron. It also has a good dephosphorization effect. After the charge ...

Embodiment 3

[0032] A method for smelting vanadium-titanium ductile iron, which includes weighing furnace charge, smelting, spheroidizing treatment and inoculation treatment, using a 50Kg intermediate frequency induction furnace for smelting, the furnace charge used is as follows: 60% of vanadium-titanium pig iron, 20% of vanadium-titanium cast iron return charge, scrap steel 15%, the rest are ferrosilicon and ferromanganese, etc.; when carrying out the smelting step, add iron oxide scales with an addition amount of 1.5% of the charge weight in the charge, and the iron oxide scales are added to the bottom of the charge during smelting; During the melting process, the skin makes the titanium in the molten iron preferentially oxidized and has no obvious effect on the content of other elements, thereby reducing the titanium content, weakening the anti-graphite spheroidization effect of titanium, and ensuring the graphite spheroidization in the vanadium-titanium nodular iron. The skin also has ...

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Abstract

The invention discloses a vanadium-titanium nodular cast iron smelting method which comprises the steps of weighing furnace burden, smelting, spheroidizing and inoculating, wherein the smelting step comprises the sub-steps: adding oxide scale of which the addition amount is 0.5-1.5 percent of the weight of the furnace burden, and adding the oxide scale at the bottom of the furnace burden during smelting and charging; in the smelting step, after the furnace burden is molten down, adding silicon iron into molten iron for regulating the components, so as to achieve the deoxidation effect. The method has the beneficial effects that the low-price oxide scale is added into the bottom of the furnace burden during charging, and the element Ti is oxidized preferentially, so that the titanium content is reduced, the inverse spheroidizing effect of titanium is weakened, nodularizing in vanadium-titanium ductile iron is guaranteed, and a good dephosphorization effect is achieved when the oxide scale is added during smelting; the oxide scale is wide in source and low in price, the oxide scale is reasonably utilized, the production cost can be reduced, and the environment-friendly energy-saving effects are achieved. According to the method, the process is simple, the operation is convenient and the cost is low, and the comprehensive performance of the vanadium-titanium nodular cast iron is guaranteed.

Description

technical field [0001] The invention relates to the technical field of smelting vanadium-titanium nodular cast iron, in particular to a method for smelting vanadium-titanium nodular cast iron. Background technique [0002] Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, so as to obtain higher strength than carbon steel. It is based on its excellent performance that it has been successfully It is mainly used to cast some parts with complex stress, high strength, toughness and wear resistance. The products produced by ductile iron casting technology have the advantages of high strength, high toughness and low price, which are very in line with the requirements of automobile production and have been widely used in automobile production. Through continuous improvement of the technical level, nodular cast iron will be used in va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C33/06
Inventor 李玉和苟淑云张雪峰党玉春沈向前
Owner XIHUA UNIV
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