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Method for producing castings by utilizing waste scrap iron and waste steel

A technology of scrap iron scraps and iron scraps, which is applied in the field of using scrap iron scraps and scrap steel to produce castings, can solve the problems of chemical composition, metallographic structure and mechanical properties, weaken the magnetic field of intermediate frequency furnaces, and high pig iron prices. Melting time, reduce production cost, enhance the effect of magnetic field

Active Publication Date: 2010-11-24
西安合力汽车配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent shape of pig iron causes the gap between the pig iron put into the intermediate frequency furnace to be too large, which weakens the magnetic field of the intermediate frequency furnace, and the chemical composition of different batches of pig iron is different, which increases the difficulty of adjusting the chemical composition during the smelting process; At the same time, the price of pig iron is higher, which increases the production cost
Manufacturing castings by smelting iron filings produced by machining can reduce the difficulty of adjusting the chemical composition in the smelting process and reduce production costs. However, the chemical composition, metallographic structure and mechanical properties of castings produced by smelting iron filings cannot meet the corresponding requirements. standard requirements

Method used

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  • Method for producing castings by utilizing waste scrap iron and waste steel
  • Method for producing castings by utilizing waste scrap iron and waste steel
  • Method for producing castings by utilizing waste scrap iron and waste steel

Examples

Experimental program
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Effect test

Embodiment 1

[0036] According to the mass percentage, take 25% of the returned charge, 55% of the iron filings with qualified chemical composition (in line with the raw material purchase standard) and 20% of scrap steel, the sum of the mass of each component taken and the mass of the charge that the intermediate frequency furnace can accommodate Equal; lay a layer of iron filings on the bottom of the intermediate frequency furnace, the quality of the laid iron filings is 5% of the above-mentioned iron filings, and then add C with a specification of 1 to 3mm on the laid iron filings. -2 furnace bottom carburizer, the quality of the C-2 furnace bottom carburizer is 0.5% of the sum of the mass of the above-mentioned components; add a part of the recovered charge into the intermediate frequency furnace with iron filings, The quality of this part of the returned charge is 25% of the mass of the retrieved charge, and then, add a part of the iron filings taken to fill the gap between the returned ...

Embodiment 2

[0038] According to the mass percentage, take 35% of the returned charge, 35% of the iron filings with qualified chemical composition (in line with the raw material purchase standard) and 30% of scrap steel, the sum of the mass of each component taken and the mass of the charge that the intermediate frequency furnace can accommodate Equal; lay a layer of iron filings on the bottom of the intermediate frequency furnace, the quality of the laid iron filings is 10% of the above-mentioned iron filings, and then add C with a specification of 1 to 3mm on the laid iron filings. -2 Furnace bottom recarburizer, the mass of the furnace bottom recarburizer is 1% of the sum of the mass of the above-mentioned components; add part of the retrieved furnace charge into the intermediate frequency furnace with iron filings, and this part is returned to the furnace charge The quality of the reclaimed charge is 35% of the mass of the reclaimed charge, and then a part of the iron filings is added t...

Embodiment 3

[0040] According to the mass percentage, take 30% of the returned charge, 45% of the iron filings with qualified chemical composition (in line with the raw material purchase standard) and 25% of scrap steel, the sum of the mass of each component taken and the mass of the charge that the intermediate frequency furnace can accommodate Equal; lay a layer of iron filings on the bottom of the intermediate frequency furnace, the quality of the laid iron filings is 7.5% of the quality of the above-mentioned iron filings, and then add C with a specification of 1 to 3mm on the laid iron filings. -2 Furnace bottom recarburizer, the quality of the furnace bottom recarburizer is 0.75% of the mass sum of the above-mentioned components; add a part of the retrieved charge into the intermediate frequency furnace with iron filings, and this part returns The quality of the charge is 30% of the mass of the reclaimed charge, and then, add a part of the scrap iron to fill the gap between the charge...

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Abstract

The invention discloses a method for producing castings by utilizing waste scrap iron and waste steel. The method comprises the following steps of: paving a layer of scrap iron at the bottom of an intermediate frequency furnace; injecting a furnace bottom carburant; adding scrap returns; filling gaps with the scrap iron; adding the waste steel; filling the gaps among the waste steel with the scrap iron; turning on power for preheating; increasing power to full load; when furnace burden at a furnace mouth descends, poking the furnace and charging until all taken raw materials are added into the intermediate frequency furnace; when all taken components are molten and the distance from the surface of molten iron to the furnace mouth is 10 to 15cm, sampling the molten furnace and performing forehearth laboratory analysis; adjusting elements in the molten iron according to an analysis result to make the content of the elements in the molten iron meet a requirement; pouring the adjusted molten iron by a method for producing gray iron castings or nodular iron castings to prepare the gray iron castings and the nodular iron castings. By using the method, the castings of which the chemical components, the metallographic structures and the mechanical properties meeting requirements can be produced; and the difficulty in adjusting the chemical components in a melting process can be reduced.

Description

technical field [0001] The invention belongs to the technical field of casting, and relates to a method for producing fittings, in particular to a method for producing castings by using scrap iron scraps and scrap steel. Background technique [0002] When producing and processing castings (including auto parts), pig iron (commonly known as bread iron) and a small amount of returned materials are mostly used. The pig iron and returned materials are put into the intermediate frequency furnace for smelting, and then the molten iron is injected into the sand mold and cooled. Finally, the blank castings of the parts to be processed are obtained. However, the inherent shape of pig iron causes the gap between the pig iron put into the intermediate frequency furnace to be too large, which weakens the magnetic field of the intermediate frequency furnace, and the chemical composition of different batches of pig iron is different, which increases the difficulty of adjusting the chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C1/08
CPCY02P10/20
Inventor 叶少腾杨周亮
Owner 西安合力汽车配件有限公司
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