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High-aluminum steel smelting method

A smelting method and high-aluminum steel technology, applied in the direction of improving process efficiency, can solve the problems of inability to remove gas and inclusions, increase the production cost of billets, and affect the quality of high-aluminum steel, so as to avoid nozzle nodules and achieve high purity. , The effect of avoiding the segregation tendency of the billet

Inactive Publication Date: 2017-06-09
赵敏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although refining outside the furnace can adjust the composition and temperature of molten steel, adding aluminum can achieve deoxidation and desulfurization, but it cannot remove the gas and inclusions in the molten steel, which will cause spot segregation, poor steel quality, etc., and make the production cost of the billet improve
[0006] Although vacuum furnaces are equipped in many metallurgical industries, vacuum furnaces achieve degassing by blowing argon into the furnace to make molten steel flow, but because the quality of aluminum in molten steel is much lighter than that of molten steel, so , during the flow of molten steel, aluminum will float up, and the floating aluminum will cause aluminum loss after contacting with steel slag
Based on this point, in the prior art, in order to avoid aluminum loss when smelting high aluminum steel, vacuum furnace degassing is not used, thus affecting the quality of high aluminum steel

Method used

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Experimental program
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Effect test

Embodiment 2

[0015] First put molten iron and steel scrap into the electric arc furnace, the mass ratio between molten iron and steel scrap is: 2:3.5, then raise the temperature of the electric arc furnace to 1680 ° C, when the weight percentage of carbon in the molten steel is 0.10%, The molten steel in the electric arc furnace is sent to the ladle refining furnace, namely the LF furnace, for refining outside the furnace. When the temperature of the LF furnace reaches 1570 ° C, after continuing at this temperature for another 90 minutes, 92% of the steel slag in the molten steel is removed. Add aluminum with a mass of 1-1.3% of the mass of molten steel to the LF furnace. After smelting for 20 minutes, add 0.2% of fluorite and 0.9% of the mass of molten steel to the LF furnace. After smelting for 20 minutes, put the molten steel into the furnace. When smelting in the vacuum furnace, the gas in the vacuum furnace is extracted to make the vacuum degree in the vacuum furnace reach 30Pa, and ar...

Embodiment 3

[0017] First put molten iron and steel scrap into the electric arc furnace, the mass ratio between molten iron and steel scrap is: 2:2.5, then raise the temperature of the electric arc furnace to 1690°C, when the weight percentage of carbon in the molten steel is 0.12%, The molten steel in the electric arc furnace is sent to the ladle refining furnace, that is, the LF furnace for refining outside the furnace. When the temperature of the LF furnace reaches 1600 ° C, after continuing at this temperature for another 70 minutes, 91% of the steel slag in the molten steel is removed. Add aluminum with a mass of 1-1.3% of the mass of molten steel to the LF furnace. After smelting for 17 minutes, add 0.2% of fluorite and 0.9% of the mass of molten steel to the LF furnace, and then pour the molten steel into the LF furnace after smelting for 18 minutes. When smelting in the vacuum furnace, the gas in the vacuum furnace is extracted to make the vacuum degree in the vacuum furnace reach 6...

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PUM

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Abstract

The invention relates to a high-aluminum steel smelting method which comprises the steps of electric-arc furnace smelting, external refining and vacuum furnace smelting. High-aluminum steel is smelted by using the high-aluminum steel smelting method, and the purity of the high-aluminum steel is high; and in particular, through vacuum treatment, gas and occluded foreign substance in steel liquid can be removed, and the water gap scaffolding and casting blank segregation trends are avoided.

Description

technical field [0001] The invention relates to a method for smelting high aluminum steel. Background technique [0002] High-aluminum steel is a kind of steel with high surface hardness and wear resistance, which is widely used in the production of components that can withstand impact loads and reciprocating wear conditions. Since the mass content of aluminum in high-aluminum steel is usually about 1%, the molten steel is viscous due to the high aluminum content and is easily oxidized, resulting in major defects, low-magnification inclusions, and point segregation on the surface of this type of steel. Quality problems, especially in the smelting process, because aluminum is easily oxidized, so it is relatively difficult to smelt high-aluminum steel. [0003] In the prior art, a technical solution is to directly use an electric arc furnace to smelt high-aluminum steel, and during smelting, put scrap steel into the electric arc furnace, and then energize and heat for smeltin...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/06C21C7/064C21C7/10
CPCC21C7/0006C21C7/06C21C7/064C21C7/10C22C33/04Y02P10/20
Inventor 赵敏
Owner 赵敏
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