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Control method of boron content in refining process of acid slag produced in silicon killed steel production

A refining process, silicon deoxidized steel technology, applied in the field of control of boron element content in molten steel refining process, which can solve the problems of slag oxidation and fluidity that are inferior to alkaline slag, unstable boron content control, and high molten steel oxidability , to achieve the effect of reducing the amount of ferroboron added, increasing the yield of boron and reducing the burning loss

Active Publication Date: 2019-01-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for molten steel refined with acidic slag, the oxidizing property of molten steel is relatively high, and the oxidizing and fluidity of molten slag is not as good as that of alkaline slag, which leads to unstable and large fluctuations in accurate boron content control during the refining process

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0034] The method for controlling the content of boron element in the refining process of silicon-deoxidized steel-making acid slag provided in this embodiment includes the following steps:

[0035] 1) Start the pouring furnace, tap the steel after blowing in the converter, and when the steel is tapped to about 1 / 3, add 3kg / t of ferrosilicon (amount per ton of molten steel, the same below), 4.3kg / t of ferromanganese, and then add low nitrogen Carbon powder 8.3kg / t, final slag modifier 2.6kg / t, adopt slide plate to block slag, and leave the station after blowing argon for 6 minutes, the diameter of argon flower is about 70cm;

[0036] 2) When the LF furnace arrives at the station, connect the argon belt, adjust the argon flower to 30-50cm, lower the electrode long-arc fluidized slag, adjust to the short-arc flow gear to raise the temperature after 5 minutes, measure the temperature and take samples after 12 minutes, sprinkle small particles of ferrosilicon on the slag surface (...

Embodiment 2

[0040] The method for controlling the content of boron element in the refining process of silicon-deoxidized steel-making acid slag provided in this embodiment includes the following steps:

[0041] 1) For continuous pouring furnace, when the converter blowing is completed and the steel is tapped, when the steel is tapped to about 1 / 3, 3kg / t of ferrosilicon and 4.3kg / t of ferromanganese are added, and finally 9.2kg / t of low-nitrogen carbon powder is added, and the final slag is changed to The quality agent is 3.5kg / t, and the steel is tapped with a sliding plate to stop the slag. After blowing argon for 7 minutes, it leaves the station. The diameter of the argon flower is about 80cm;

[0042] 2) When the LF furnace arrives at the station, connect the argon belt, adjust the argon flower to 30-50cm, lower the electrode long-arc fluidized slag, adjust to the short-arc flow gear to raise the temperature after 4 minutes, measure the temperature and take samples after 15 minutes, spr...

Embodiment 3

[0046] The method for controlling the content of boron element in the refining process of silicon-deoxidized steel-making acid slag provided in this embodiment includes the following steps:

[0047] 1) For continuous pouring furnace, when the converter blowing is completed and the steel is tapped, when the steel is tapped to about 1 / 3, 3kg / t of ferrosilicon and 4.3kg / t of ferromanganese are added, and then 5.2kg / t of low nitrogen carbon powder is added, and the final slag is changed to The quality agent is 2.6kg / t, and the steel is tapped with a sliding plate to stop the slag. After blowing argon for 5 minutes, it leaves the station. The diameter of the argon flower is about 70cm;

[0048] 2) When the LF furnace arrives at the station, connect the argon belt, adjust the argon flower to 30-50cm, lower the electrode long-arc fluidized slag, adjust to the short-arc flow gear to raise the temperature after 4 minutes, measure the temperature and take samples after 10 minutes, sprink...

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Abstract

The invention discloses a control method of boron content in the refining process of acid slag produced in silicon killed steel production. The control method includes the steps of firstly, molten steel is subjected bessemerizing and tapping, silicon iron and ferromanganese are added in the tapping process to perform deoxidization alloying, low-nitrogen carbon powder is added according to tappingcarbon content, a final slag modifier is added, and a tapping end point adopts slag-stopping tapping; secondly, after LF furnace slag temperature rise, 0.17-0.35kg of silicon iron is added into each ton of steel to perform slag top deoxidization; 2-4kg of lime is added into each ton of steel to produce high-alkalinity reducing slag, FeO and MnO in the slag is not more than 2.0%, and the alkalinityof the slag is not smaller than 2; thirdly, alloy is regulated according the components of refined molten steel, quartz sand is added to regulate the alkalinity to be not larger than 1.2, soft blow is performed for 15-20 minutes after slugging, and ferroboron is added to perform alloying; fourthly, argon stirring is performed for at least 5 minutes after the ferroboron is added, and delivering the molten steel out of a station. The control method has the advantages that boron alloying is performed in the refining late stage when O and N are stable, boron content fluctuation in the steel is controlled within 6ppm, boron yield is increased by 15%, and ferroboron adding quantity is reduced by 30%.

Description

technical field [0001] The invention relates to a method for controlling the content of boron element in the refining process of molten steel, in particular to a method for controlling the content of boron element in the process of refining silicon-deoxidized steel-making acid slag. Background technique [0002] B in steel is soluble in Fe to form interstitial and displacement solid solutions, and at the same time forms compounds with Fe, C, N, O, etc. Boron mainly delays phase transformation by reducing the nucleation rate of austenite transformation nuclei. Shift the s-curve of steel to the right to improve the hardenability of steel. Adding 0.001% boron can double the hardenability of steel. The boron content in boron-containing steel is low. If the boron content in the steel is too much, the steel will easily produce "boron phase" during heat treatment, which will have an adverse effect on the performance of the steel. Therefore, the boron composition control range is r...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/00
CPCC21C7/0006C21C7/06C21C2007/0018
Inventor 廖扬标吴义强段光豪
Owner 武汉钢铁有限公司
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