Method for controlling boron content of boron steel

A technology of boron content and boron steel, which is applied in the direction of improving process efficiency, can solve the problems of boron steel exceeding the control range and other problems, and achieve the effect of improving performance, saving production cost and reducing production consumption.

Active Publication Date: 2016-03-02
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for controlling the boron content in boron steel, which is used to solve the technical problem that the boron content of boron steel exceeds the control range in the prior art

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  • Method for controlling boron content of boron steel

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Experimental program
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Embodiment

[0022] Please refer to figure 1 , the embodiment of the present application provides a method for controlling boron content in boron steel, the method comprising:

[0023] Step 101: adding aluminum-iron deoxidation when the tapping amount of the converter is 2 / 5-1 / 2 of the total tapping amount, and controlling the mass percentage of acid-soluble aluminum to 0.03-0.05% after the molten steel is completely deoxidized;

[0024] Step 102: Deoxidize the top slag of the ladle after tapping: add slag reforming agent to the slag surface of the ladle, bottom blow and stir for 3-5 minutes, control the flow rate of the ladle online bottom blow to 400-600NL / min per channel, and pour FeO in molten steel The sum of the mass percentages of MnO and MnO is controlled to be less than or equal to 5%;

[0025] Step 103: During the molten steel refining process, when the mass percentage of Als in the molten steel reaches 0.020-0.040% and the mass ratio of Als to Alt is greater than 0.85, the B co...

example 1

[0033] Example 1: Production of boron-containing SS400 using converter-CAS-OB-casting machine process:

[0034] 1) Use a slide plate to block slag to tap the steel. When tapping the steel, double bottom blowing argon gas is stirred, and the flow rate of each bottom blowing is controlled at 300NL / min. When the tapping amount is 1 / 5, add 574Kg of small-grained lime and 208Kg of fluorite;

[0035] 2) Add 1600kg of aluminum and iron when the tapping amount is 2 / 5;

[0036] 3) After tapping, add 100kg of aluminum slag balls to the slag surface, increase the bottom blowing argon to 600NL / min (each channel), turn off the bottom blowing argon after stirring for 3-5 minutes, and take molten steel samples to analyze acid-soluble aluminum Content 0.0315%;

[0037] 4) After the molten steel enters the CAS-OB refining station, first adopt dual-channel bottom blowing, the flow rate of the bottom blowing is controlled at 800NL / min in each channel, stir for 4-5 minutes, measure the temperatu...

example 2

[0042] Using converter-RH-casting machine process to produce boron-containing SAE1008:

[0043] 1) Use a slide plate to block slag and tap the steel. When tapping, double bottom blowing argon gas is stirred, and the flow rate of each bottom blowing is controlled at 350NL / min. When the tapping amount is 1 / 5, add 600Kg of small-grained lime and 198Kg of fluorite;

[0044] 2) Add 1126kg of aluminum and iron when the tapping amount is 2 / 5;

[0045] 3) After tapping, add 115kg of aluminum slag balls to the slag surface, increase the bottom blowing argon to 600NL / min (each channel), and after bottom blowing and stirring for 3-5 minutes, take a molten steel sample to analyze the acid-soluble aluminum content of 0.0348%;

[0046] 4) After the molten steel enters the RH refining station, vacuum cycle for 5 minutes, measure the temperature, take a sample of the molten steel, and at the same time take a top slag sample to analyze that the content of the component (FeO+MnO) is 2.7%;

[0...

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Abstract

The invention discloses a method for controlling the boron content of boron steel. The method includes the steps that ferro-aluminum is added for deoxygenation when the steel output of a converter ranges from two fifths to one half of the total steel output, and the mass percentage content of acid saluted aluminum is controlled to be 0.03%-0.05% after molten steel is completely deoxidized; ladle top slag is deoxidized after steel output is completed, wherein a slag modifying agent is added to the slag surface of a ladle, bottom blowing and stirring are performed for 3-5 min, the online bottom blowing flow of the ladle is controlled to range from 400 NL / min to 600 NL / min, and the sum of the mass percentage content of FeO and the mass percentage content of MnO in the molten steel is controlled to be 5% or less; and in the refining process of the molten steel, when the mass percentage content of Als in the molten steel reaches 0.020%-0.040% and the mass ratio of Als to Alt is larger than 0.85, the component B in the molten steel is adjusted through ferroboron, the mass percentage content of the component B is controlled to range from 0.0009% to 0.0015%, and the absorptivity of the component B in the steel is made to range from 80% to 85%. According to the technical scheme, the technical problem that the boron content of boron steel is beyond the control range in the prior art is solved, and performance of boron steel is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for controlling the boron content in boron steel. Background technique [0002] The purpose of adding a small amount of boron to steel is to obtain excellent mechanical properties of steel and save a lot of precious and rare metal elements. However, the addition of trace amounts of boron to steel greatly increases the crack sensitivity of steel. For the production of boron steel, due to the low and unstable yield of boron, the boron content deviation between furnaces is relatively large, and finally manifested as unstable control of transverse crack defects at the corners of continuous casting slabs, and large performance differences . One of the main factors affecting the stability of boron control is: [0003] The content of oxygen and nitrogen in steel directly affects the absorption rate of boron. Oxygen causes the oxidation of boron, and nitrogen is easy to co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/076
CPCC21C7/06C21C7/076Y02P10/20
Inventor 王朝斌单庆林景财良彭国仲王雷川陈玉鑫黄财德安超黄俊
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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