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Production method of high-strength grey cast iron for automobile fittings

A production method, the technology of gray cast iron, is applied in the production field of high-strength auto parts gray cast iron, which can solve the problems affecting processing and use, and achieve the effect of less air bubbles, less cracking and low content

Inactive Publication Date: 2009-09-09
WUHU JINMAO FLUID TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The furnace charge for the production of gray cast iron is generally composed of newborn iron, scrap steel, returned iron and ferroalloy. The purpose of adding scrap steel to the furnace charge is to reduce the carbon content in the molten iron, thereby improving the mechanical properties of gray cast iron. The weight ratio of scrap steel in the furnace charge is generally 10-30%, if too much scrap is added, it is easy to produce too much cementite and form white spots, which affects processing and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The production method of high-strength auto parts gray cast iron includes the following processes: batching process, feeding process, smelting process, furnace pretreatment process,

[0022] In the described batching process: the charge used comprises steel scrap, returned gray iron, ferromanganese alloy (65 manganese), ferrosilicon alloy (75Si), coke foam and lithium carbonate with a carbon content of more than 85%, and its weight ratio is that of steel scrap , returned furnace iron, ferromanganese alloy, ferrosilicon alloy, coke foam, respectively 80:10:0.5:1.0:3.5:0.1.

[0023] In the above-mentioned feeding process, the feeding sequence is gray iron returned to the furnace, coke foam, ferromanganese alloy, ferrosilicon alloy, covering agent iron filings, and scrap steel. The amount of iron filings should be sufficient to completely cover the recarburizer.

[0024] The smelting process is as follows: first start the furnace with low power, increase the power of the e...

Embodiment 2

[0027] The production method of high-strength auto parts gray cast iron includes the following processes: batching process, feeding process, smelting process, furnace pretreatment process,

[0028] In the described batching process: the charge used comprises steel scrap, returned gray iron, ferromanganese alloy (65 manganese), ferrosilicon alloy (75Si), coke foam and lithium carbonate with a carbon content of more than 85%, and its weight ratio is that of steel scrap , Returned iron, ferromanganese alloy, ferrosilicon alloy, coke foam = 85:15:0.75:1.6:3.8:0.3.

[0029] In the above-mentioned feeding process, the feeding sequence is gray iron returned to the furnace, coke foam, ferromanganese alloy, ferrosilicon alloy, covering agent iron filings, and scrap steel. The amount of iron filings should be sufficient to completely cover the recarburizer.

[0030] The smelting process is as follows: start the furnace with low power first, then increase the power of the electric furnac...

Embodiment 3

[0033] The production method of high-strength auto parts gray cast iron includes the following processes: batching process, feeding process, smelting process, furnace pretreatment process,

[0034] In the described batching process: the charge used comprises steel scrap, returned gray iron, ferromanganese alloy (65 manganese), ferrosilicon alloy (75Si), coke foam and lithium carbonate with a carbon content of more than 85%, and its weight ratio is that of steel scrap , Returned furnace iron, ferromanganese alloy, ferrosilicon alloy, coke foam = 90:20:1:1.8:4.5:0.5.

[0035] In the above-mentioned feeding process, the feeding sequence is gray iron returned to the furnace, coke foam, ferromanganese alloy, ferrosilicon alloy, covering agent iron filings, and scrap steel. The amount of iron filings should be sufficient to completely cover the recarburizer.

[0036] The smelting process is as follows: start the furnace with low power first, then increase the power of the electric f...

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Abstract

The invention discloses a production method of high-strength grey cast iron for automobile fittings. The method comprises the following procedures: batching procedure, charging procedure, smelting procedure and pre-furnace processing procedure. In the batching procedure, furnace charges used comprise scrap steel, remelting gray iron, manganese iron alloy, ferrosilicon alloy and a carburetant with the weight ratio of the scrap steel, the remelting gray iron, the manganese iron, the ferrosilicon alloy and the carburetant being 80-90:10-20:0.5-1.0:1.0-1.8:3.5-4.0 respectively. Compared with the prior art, the high-strength grey cast iron is generated by taking the scrap steel as a main raw material and adjusting various elements in the scrap steel. The high-strength grey cast iron is characterized in that few air bubbles are produced and cracks are not easily generated in castings if the grey cast iron is poured on the castings.

Description

technical field [0001] The invention belongs to a production method of gray cast iron, in particular to a production method of high-strength auto parts gray cast iron. Background technique [0002] The furnace charge for the production of gray cast iron is generally composed of newborn iron, scrap steel, returned iron and ferroalloy. The purpose of adding scrap steel to the furnace charge is to reduce the carbon content in the molten iron, thereby improving the mechanical properties of gray cast iron. The weight ratio of scrap steel in the furnace charge is generally 10-30%, if too much scrap is added, it is easy to produce too much cementite and form white spots, which will affect processing and use. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a production method of high-strength auto parts gray cast iron with scrap steel as the main raw material. [0004] The technical scheme for solving technical problems...

Claims

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Application Information

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IPC IPC(8): C21C1/08B22D1/00
CPCY02P10/20
Inventor 孙述全季亮
Owner WUHU JINMAO FLUID TECH CO LTD
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