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Production method for improving pouring performance of high-aluminum bearing steel

A casting performance, high-aluminum bearing technology, applied in the manufacture of converters, etc., can solve the problems of nozzle flocculation, poor fluidity, alumina inclusion flocculation, etc.

Inactive Publication Date: 2021-07-06
吕梁建龙实业有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] Bearing steel belongs to high-carbon and high-chromium steel. The molten steel has high viscosity and poor fluidity. During the continuous casting process, the aluminum oxide inclusions in the molten steel adhere, gather and grow on the inner wall of the nozzle. When it develops to a certain extent, it will cause Water outlet flocculation or even blockage
The most effective way to solve the problem of alumina inclusion flocculation is calcium treatment of molten steel, but the bearing steel production standard does not allow calcium treatment of molten steel, so the pouring problem has always been the biggest problem that plagues the increase in the number of continuous casting furnaces for bearing steel
[0007] According to the production method provided by the above patents, the Als of the finished product of bearing steel is generally controlled at about 0.010%. 2 o 3 Inclusions will greatly deteriorate the pouring performance of molten steel, resulting in the reduction of the number of continuous casting furnaces to 4 to 5 furnaces, and increasing the Als content in bearing steel is an important part of the exploration of high-quality bearing steel technology

Method used

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  • Production method for improving pouring performance of high-aluminum bearing steel

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Embodiment 1

[0031] The production method for improving the pouring performance of high-aluminum bearing steel in this embodiment is suitable for the production of bearing steel steel grades and their weight percentages: C: 0.90% to 1.10%, Si: 0.20% to 0.30%, Mn: 0.20 % to 0.40%, Cr: 1.00% to 1.50%, Al: 0.025% to 0.035%.

[0032] Include the following steps:

[0033] (1) Converter smelting: Top-bottom double-blown converter is used. The dissolved oxygen content of molten steel tapped from the converter is 285ppm. Aluminum blocks, recarburizers, ferrosilicon, ferromanganese and other alloys are added during the tapping process for deoxidation alloying. The silicon content is 0.042%, and the silicon content is 0.09%. When the tapping rate is 70%, 3.5kg / ton of lime and high-basic pre-melted slag are added each, and the binary basicity of ladle slag is 8.2.

[0034] (2) LF refining: LF refining treatment time is 38 minutes, LF furnace starts heat treatment for 3 minutes, adds lime 3.5kg / ton o...

Embodiment 2

[0038] (1) Converter smelting: Top-bottom double-blown converter is used. The dissolved oxygen content of molten steel tapped from the converter is 367ppm. During the tapping process, aluminum blocks, recarburizers, ferrosilicon, ferromanganese and other alloys are added for deoxidation and alloying. The silicon content is 0.046%, and the silicon content is 0.10%. When the tapping rate is 70%, 3.5kg / ton of lime and high-basicity pre-melted slag are added each, and the binary basicity of ladle slag is 8.0.

[0039] (2) LF refining: LF refining treatment time is 40 minutes, LF furnace starts heating treatment for 3 minutes and adds lime 3.8kg / ton of steel, does not feed aluminum wire, finished molten steel has aluminum 0.028%; starts to add ferrosilicon powder 0.8kg / ton of steel after treatment for 15 minutes , quartz sand 0.6kg / ton steel, ferrosilicon alloy 1.0kg / ton steel; molten steel finished silicon content 0.25%, LF furnace final slag composition CaO: 47.2%, SiO2: 18.1%, Al...

Embodiment 3

[0043] (1) Converter smelting: Top-bottom double-blown converter is used. The dissolved oxygen content of molten steel tapped from the converter is 248ppm. Aluminum blocks, recarburizers, ferrosilicon, ferromanganese and other alloys are added during the tapping process for deoxidation alloying. The silicon content is 0.040%, and the silicon content is 0.08%. When the tapping rate is 70%, 3.5kg / ton of lime and high-basic pre-melted slag are added each, and the binary basicity of ladle slag is 8.5.

[0044] (2) LF refining: LF refining treatment time is 40 minutes, LF furnace starts heat treatment for 3 minutes, adds lime 3.8kg / ton steel, heats for 10 minutes, feeds aluminum wire 30m, controls the aluminum content of molten steel to 0.048%, and the finished product aluminum of molten steel is 0.030%; processing for 15 minutes Start to add ferrosilicon powder 1.2kg / ton of steel, quartz sand 0.5kg / ton of steel, ferrosilicon alloy 1.2kg / ton of steel; the finished silicon content of...

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Abstract

The invention belongs to the technical field of steel and iron smelting production, and discloses a production method for improving the pouring performance of high-aluminum bearing steel in order to control the risk that impurities in molten steel exceed the standards and improve the pouring performance of the bearing steel. steel ladle slag in a converter tapping process and at an initial stage of LF furnace refining is controlled to be binary high-basicity slag for Al2O3 denaturation reaction. In the middle stage of LF furnace refining, ferrosilicon and ferrosilicon powder are added, a ternary refining slag system with CaO-Al2O3-SiO2 as the core is subjected to large-range component adjustment, residual high-melting-point Al2O3 and xCaO.yAl2O3 are denatured into ternary low-melting-point inclusions, so that the problem of nozzle nodulation in the square billet pouring process is avoided; and under the condition that a calcium treatment process is not used, the continuous casting of the molten high-aluminum bearing steel for 15-20 furnaces is realized; and meanwhile, B-class and D-class non-metallic inclusions in the inclusions are less than or equal to 1.0 grade, and Ds-class non-metallic inclusions are less than or equal to 0.5 grade.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting production, is applied to the continuous casting production of high-aluminum bearing steel billets, and specifically relates to a production method for improving the casting performance of high-aluminum bearing steel. Background technique [0002] Bearing steel belongs to high-carbon and high-chromium steel. The molten steel has high viscosity and poor fluidity. During the continuous casting process, the aluminum oxide inclusions in the molten steel adhere, gather and grow on the inner wall of the nozzle. When it develops to a certain extent, it will cause Water outlet flocculation or even blockage. The most effective way to solve the problem of alumina inclusion flocculation is calcium treatment of molten steel, but the bearing steel production standard mandates that calcium treatment of molten steel is not allowed, so the pouring problem has always been the biggest problem that p...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/18C21C5/36C21C7/00C21C7/06C21C7/10
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/18C21C5/36C21C7/06C21C7/0006C21C7/0025C21C7/10
Inventor 李刚郭键马海宾赵彦岭韩新文李炳岳卢淑艳郭建峰
Owner 吕梁建龙实业有限公司
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