Method for recycling steel scraps

A technology of steel shavings and aluminum shavings, applied in the field of recycling steel shavings, can solve the problem that the effective utilization rate is not higher than 70%, and achieve the effect of low forming temperature

Inactive Publication Date: 2014-08-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current common utilization method of aluminum scrap is remelting and recycling. Due to the high chemical activity of aluminum, its effective utilization rate is often not higher than 70%.
[0003]Fe3Al intermetallic compound contains Fe and Al at the same time, has low density, high strength and elastic modulus, anti-oxidation, heat resistance Corrosion, wear resistance and other characteristics, its resources are abundant, low cost, it is a very potential high-temperature structural material, suitable for high-temperature wear-resistant occasions, such as brake discs and other wear-resistant parts; but due to its Room temperature brittleness and material strength drop sharply after the temperature exceeds 600 °C, Fe3Al has not been widely used as a structural material in the industry, and the engineering of Fe3Al intermetallic compounds The application mainly depends on its manufacturing process to some extent. Rapid solidification can eliminate macro segregation and grain boundary segregation, refine grains, and reduce order degree. Therefore, rapid solidification process has become a method to improve room temperature plasticity of intermetallic compounds. An important method, if steel scrap and aluminum scrap can be prepared into fine-grained Fe3Al intermetallic compound according to the composition ratio of Fe3Al intermetallic compound, It can not only effectively utilize steel scrap and aluminum scrap, but also promote the practical application of Fe3Al intermetallic compounds

Method used

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  • Method for recycling steel scraps

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Effect test

Embodiment 1

[0017] This embodiment specifically implements a method for preparing and recycling iron filings. The specific process is: add a layer of ZL101A aluminum heated to 605 °C at the bottom of the die cavity of a compression mold made of die steel with a wall thickness of 15 mm and a section diameter of 100 mm. Alloy chips, the average size of the chips is 50μm, the total impurity content is 0.8wt.%, and the thickness of the aluminum chips is 1.0mm; then add a layer of steel chips heated to 605°C, the average size of the steel chips is 100μm, and the total impurity content is 0.9wt .%, the thickness of the steel chips is 1.5mm; then the surface of the steel chips in the die cavity of the pressing die is pressed by the stamping head made of die steel, the pressure is 30MPa, and the holding time is 5s; the stamping head is lifted and then Add a layer of aluminum chips, repeat the above steps until the material obtained in the pressing mold reaches the required thickness; keep the pres...

Embodiment 2

[0020] This embodiment specifically implements a method for preparing and recycling iron filings. The specific process is: add a layer of hot water heated to 620° C. ZL102 aluminum alloy chips, the average size of the chips is 300 μm, the total impurity content is 0.9wt.%, and the thickness of the aluminum chips is 2.0 mm; then add a layer of steel chips heated to 620 ° C, the average size of the steel chips is 500 μm, and the total impurity content is 0.9wt.%, the thickness of the steel chips is 2.5mm; then the surface of the steel chips in the die cavity of the pressing die is pressed by the stamping head made of die steel, the pressure is 80MPa, and the holding time is 3s; the stamping head is lifted Then add a layer of aluminum chips, repeat the above steps until the material obtained in the pressing mold reaches the required thickness; keep the pressed material in the pressing mold at 620°C for 6 hours, and then heat it at a speed of 10°C / min. Cool the composite of steel ...

Embodiment 3

[0022] This embodiment specifically implements a method for preparing recycled iron filings. The specific process is: add a layer of ZL101A aluminum heated to 610°C at the bottom of the die cavity of a compression mold made of die steel with a wall thickness of 15 mm and a section diameter of 150 mm. Alloy chips, the average size of the chips is 100μm, the total impurity content is 0.8wt.%, and the thickness of the aluminum chips is 1.5mm; then add a layer of steel chips heated to 610°C, the average size of the steel chips is 200μm, and the total impurity content is 0.7 wt.%, the thickness of the steel chips is 2.0mm; then the surface of the steel chips in the die cavity of the pressing die is pressed by a stamping head made of die steel, the pressure is 50MPa, and the holding time is 4s; after the stamping head is lifted Add another layer of aluminum chips, repeat the above steps until the material obtained in the pressing mold reaches the required thickness; keep the pressed ...

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Abstract

The invention relates to steel and iron materials, in particular to a method for recycling steel scraps. The principle of the method is characterized in that the characteristic that the viscosity of aluminum scraps is large at the temperature close to the liquidus temperature of the aluminum scraps, the steel scraps and the aluminum scraps are pressed together at the temperature, reactive sintering is implemented under the pressure effect, steel and aluminum are interacted in the sintering process to form an iron-aluminum intermetallic compound, oxide on the surfaces of the steel scraps and the aluminum are reacted to generate aluminum oxide, and compact composite materials composed of steel particles, the iron-aluminum intermetallic compound and the aluminum oxide are finally formed.

Description

technical field [0001] The invention relates to iron and steel materials, in particular to a method for recycling steel shavings. Background technique [0002] Iron and steel materials are currently the most widely used metal materials, and their consumption accounts for more than 90% of the total metal materials. In the process of processing steel materials into parts, a large amount of chips are often formed. According to statistics, the steel chips formed every year in the world can reach 300 to 400 million tons. At present, the main way to use steel chips is to remelt them in the furnace for recycling. Due to the small size of the steel scrap, the surface area is large, making it very easy to oxidize during the remelting process. The current utilization rate is roughly 85~90%. On the other hand, in the production process of aluminum alloy materials, a large amount of of aluminum shavings. The current common utilization method of aluminum scrap is remelting and recyclin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/02B22F3/14
Inventor 陈刚史经浩赵玉涛邵静波
Owner JIANGSU UNIV
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