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Methods for manganese removal of cast iron

a technology of cast iron and manganese, which is applied in the field of methods for removing manganese from cast iron, can solve the problems of internal defects and deformation of toughness, and achieve the effects of high efficiency, small amount of produced slag, and removal of manganes

Inactive Publication Date: 2017-11-30
KINOSHITA MANUFACTORY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a method for removing manganese from cast iron without needing a demanganese agent or producing a lot of slag. The method is efficient and effective, making it easy to remove manganese from cast iron.

Problems solved by technology

The feedstock used for the production of cast iron castings utilizes steel scraps of automobile steel plates; the recent request for weight reduction has increased the manganese content in automobile steel plates; manganese is a pearlitization accelerating element, and accordingly causes a problem which is that the toughness is degraded and internal defects tend to be caused.

Method used

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  • Methods for manganese removal of cast iron
  • Methods for manganese removal of cast iron
  • Methods for manganese removal of cast iron

Examples

Experimental program
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Effect test

example 1

[0042]By using the furnace shown in FIG. 1, a manganese removal test (test A) of a cast iron was performed. During the present test, the measurement of the components of the molten cast iron was performed for the specimens sampled at appropriate times from the furnace by using an emission spectrophotometer (PDA-7020, manufactured by Shimadzu Corp.). The temperature measurement of the molten cast iron was performed by using an immersion type thermocouple. The amount of the molten cast iron poured was set to be 500 kg or 300 kg (only in Example 2). The oxygen feeding unit for feeding oxygen used a burner capable of feeding only oxygen or a mixed gas of oxygen and propane gas (LPG), or a sonic nozzle capable of feeding oxygen at a supersonic speed. When only oxygen was fed with a burner, the oxygen flow rate was 5 Nm3 / h. When oxygen was fed with a sonic nozzle, oxygen flow rate was 3 Nm3 / h. The inner diameter of the gas feed opening of the burner was approximately 15 mm, and the inner ...

example 2

[0052]By using the furnace shown in FIG. 2, a manganese removal test (test B) of a cast iron was performed. The test was performed by variously changing the oxygen feeding conditions or the stirring conditions of the molten cast iron as shown in Table 3. In Examples 4 to 6, the blowing of air at 200 L / min as well as the feeding of oxygen was performed. The blowing of air was performed by the same method as in Example 1 or 3 of the test A. In Examples 7 to 9, oxygen was fed at 20 Nm3 / h from the start to the end of the test, and stirring speed of the stirring unit 17 was variously changed. For example, in Example 7, the stirring speed of the stirring unit 17 was 200 rpm from the start to the end of the test; in Example 8, the test was started at 100 rpm and the stirring speed was increased to 200 rpm after an elapsed treatment time of 11 minutes. In the present test, the measurement of the components of the molten cast iron or the measurement of the temperature of the molten cast iron...

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Abstract

The present invention does not require a demanganese agent such as a sulfide or a combustible gas in the removal of manganese of cast iron. The method for removing manganese of cast iron according to the present invention is implemented by performing the removal of a manganese component by allowing a furnace to be in an oxygen atmosphere, and by blowing air into a molten cast iron in the furnace, while a carbon component in the molten cast iron is being maintained at an approximately constant amount. Alternatively, the method for removing manganese of cast iron according to the present invention is implemented by performing the removal of the manganese component by allowing the furnace to be in an oxygen atmosphere and by stirring the molten cast iron in the furnace, while the carbon component in the molten cast iron is being maintained at an approximately constant amount.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for removing manganese in a feedstock having a high manganese content to be used for the production of cast iron members.BACKGROUND ART[0002]Cast iron castings have been used for vehicle components or machine components, approximately half of the amount of cast iron castings produced is for vehicles, and cast iron castings account for approximately 10% of the gross vehicle weight. The feedstock used for the production of cast iron castings utilizes steel scraps of automobile steel plates; the recent request for weight reduction has increased the manganese content in automobile steel plates; manganese is a pearlitization accelerating element, and accordingly causes a problem which is that the toughness is degraded and internal defects tend to be caused.[0003]For the problem of the increase of the manganese content in the feedstock used for the production of cast iron members, the following proposals have been made. For ex...

Claims

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Application Information

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IPC IPC(8): C21C1/04
CPCC21C1/04B22D1/00B22D1/002C22C37/10
Inventor KINOSHITA, KIYOSHIMURATA, HIROTOSHI
Owner KINOSHITA MANUFACTORY