Thermal treatment method of spheroidal graphite cast iron worm wheel

A heat treatment method and technology of ductile iron, applied in the direction of heat treatment furnace, heat treatment equipment, process efficiency improvement, etc., can solve the problems of poor wear resistance of gray cast iron, affecting the continuous production of sugar factories, etc., to improve wear resistance, Simple effect of heat treatment method

Inactive Publication Date: 2017-05-10
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The worm wheel of the known filter cloth vacuum suction machine in the sugar factory is cast with gray cast iron, which has poor wear resistance and seriously affects the continuous production of the sugar factory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of heat treatment method of nodular cast iron worm gear of this example, comprises following several steps:

[0018] The first step: ingredients: steel scrap, recycled material, pig iron, ferrosilicon according to C3.8%, Si2.0%, Mn0.2%, P﹤0.08%, S≤0.02%, the balance is Fe weight percentage carry out ingredients;

[0019] Step 2: Preheating: Put the optimized calculated steel scrap, recycled material and pig iron into the medium frequency induction furnace for preheating;

[0020] The third step: smelting: After melting the steel scrap, recycled materials, and pig iron in the intermediate frequency induction furnace, put in a deoxidizer whose amount is 12% of the furnace charge, and whose composition is 70% lime + 30% fluorite for pre-deoxidation, and then put into baking For the treated ferromanganese, ferronickel and ferrosilicon, when the temperature of molten iron rises to 1350°C, add 0.1% slag remover to remove slag once, and then cover the heat preservation...

Embodiment 2

[0027] A kind of heat treatment method of nodular cast iron worm gear of this example, comprises following several steps:

[0028] The first step: ingredients: steel scrap, recycled materials, pig iron, and ferrosilicon in the form of C4.15%, Si2.25%, Mn0.3%, P﹤0.075%, S≤0.02%, and the balance is the weight percentage of Fe carry out ingredients;

[0029] Step 2: Preheating: Put the optimized calculated steel scrap, recycled material and pig iron into the medium frequency induction furnace for preheating;

[0030] The third step: smelting: After melting the steel scrap, recycled material, and pig iron in the intermediate frequency induction furnace, put in a deoxidizer whose amount is 16% of the furnace charge, and whose composition is 70% of lime + 30% of fluorite for pre-deoxidation, and then put into baking For the treated ferromanganese, ferronickel and ferrosilicon, when the temperature of molten iron rises to 1365°C, add 0.1% slag remover to remove slag once, and then c...

Embodiment 3

[0037] A kind of heat treatment method of nodular cast iron worm gear of this example, comprises following several steps:

[0038] The first step: ingredients: steel scrap, recycled material, pig iron, ferrosilicon according to the method of C4.5%, Si2.5%, Mn0.4%, P﹤0.07%, S≤0.02%, and the balance is Fe weight percentage carry out ingredients;

[0039] Step 2: Preheating: Put the optimized calculated steel scrap, recycled material and pig iron into the medium frequency induction furnace for preheating;

[0040] The third step: smelting: After melting the steel scrap, recycled material, and pig iron in the intermediate frequency induction furnace, put in a deoxidizer whose amount is 20% of the furnace charge, and whose composition is 70% lime + 30% fluorite for pre-deoxidation, and then put into baking For the treated ferromanganese, ferronickel and ferrosilicon, when the temperature of molten iron rises to 1380°C, add 0.1% slag remover to remove slag once, and then cover the ...

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PUM

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Abstract

The invention discloses a thermal treatment method of a spheroidal graphite cast iron worm wheel. The spheroidal graphite cast iron worm comprises the following components in percentages by weight: 3.8-4.5% of C, 2.0-2.5% of Si, 0.2-0.4% of Mn, less than 0.08-0.07% of P, less than or equal to 0.02% of S and the balance of Fe. The method comprises the steps: proportioning; preheating; smelting; ladle analysis; final deoxidation; spheroidal graphite treatment and inoculation; pouring; and pearlite treatment. The thermal treatment method is simple. The wear resistance of spheroidal graphite cast iron is improved by virtue of strictly controlling the adding amount of carbon and silicon in the spheroidal graphite cast iron and by means of spheroidizing treatment and pearlite treatment. The method is particularly suitable for casting a worm wheel of a filter cloth-free vacuum filter.

Description

technical field [0001] The invention relates to the technical field of ferrous metal production, in particular to a heat treatment method for a nodular cast iron worm wheel. Background technique [0002] my country has been producing nodular cast iron since 1950, and has developed rich rare earth resources since the 1970s. Therefore, on the basis of magnesium nodular cast iron, my country's unique rare earth nodular cast iron has been developed. At present, it has been used in automobiles, agricultural machinery, and ships. , metallurgy, chemical industry, sugar machine, etc., have become important casting materials. Pearlitic ductile iron has good wear resistance, so it is very suitable for shaft parts and gears. The worm gear of the known filter-cloth-free vacuum suction machine in a sugar factory is cast with gray cast iron, which has poor wear resistance, which seriously affects the continuous production of the sugar factory. [0003] In order to improve the wear resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C22C33/08C21D5/00C21D9/32
CPCC21D5/00C21D9/32C21D2211/009C22C33/08C22C37/04C22C37/10Y02P10/20
Inventor 梁宇艳
Owner GUANGXI UNIV
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