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Boron bearing steel smelting technological method for improving boron yield

A process method and a technology of yield rate, applied in the field of boron-containing steel smelting process, can solve problems such as short boron elements, achieve the effects of increasing the content, reducing production costs, and shortening the smelting process

Active Publication Date: 2017-10-24
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a boron-containing steel smelting process method that increases the yield of boron to solve the problems existing in the smelting of boron-containing steel in the prior art. Boron-added steel smelting process with low cost, simple operation, high yield of boron element and stable boron content in molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) High-temperature tapping of the converter, the tapping temperature reaches 1668°C, about 30% of the tapping is added to molten steel for deoxidation and alloying; after tapping, add slag adjustment to the slag surface of the ladle The agent is 3.3kg / t, the particle size of the slagging agent is 60mm, and the composition is: Al 39%, Ca 8%, CaO 30%, Al 2 o 3 16%, CaF 2 6%, the rest is impurities, lime 2.6kg / t, the flow rate of argon gas blowing at the bottom of the ladle during tapping is controlled at 150NL / min, and the bottom blowing and stirring are continued for 4.5 minutes after all the alloy and slag adjusting agent are added;

[0033] 2) The ladle is transferred to the VOD station, the VOD entry temperature is 1617°C, and the T.Fe+MnO is 1.76%. After the ladle is placed in place, turn on the bottom blowing and start vacuuming. The flow rate of the bottom blowing argon and hydrogen gas mixture is 15NL / min, the capacity ratio of argon to hydrogen is 8:2, and t...

Embodiment 2

[0036] 1) High-temperature tapping of the converter, the tapping temperature reaches 1675°C, about 30% of the tapping is added to the molten steel for deoxidation alloying, such as aluminum, ferrosilicon, manganese alloy, carbon powder, etc.; after tapping, add slag adjustment to the ladle slag surface The agent is 1.5kg / t, the particle size of the slagging agent is 40mm, and the composition is: Al 30%, Ca 10%, CaO 35%, Al 2 o 3 15%, CaF 2 5%, the rest is impurities, lime 2.0kg / t, the flow rate of argon gas blowing at the bottom of the ladle during tapping is controlled at 80NL / min, and the bottom blowing and stirring are continued for 4 minutes after all the alloy and slag adjusting agent are added;

[0037]2) The ladle is transferred to the VOD station, the VOD entry temperature is 1615°C, and the T.Fe+MnO is 1.55%. After the ladle is placed in place, turn on the bottom blowing and start vacuuming. The flow rate of the bottom blowing argon and hydrogen gas mixture is 5NL...

Embodiment 3

[0040] 1) High-temperature tapping of the converter, the tapping temperature reaches 1655°C, about 30% of the tapping is added to the molten steel for deoxidation and alloying; after tapping, add slag adjustment to the slag surface of the ladle The agent is 5.5kg / t, the particle size of the slagging agent is 70mm, and the composition is: Al 40%, Ca 3%, CaO 25%, Al 2 o 3 20%, CaF 2 10%, the rest is impurities, lime 4.0kg / t, the flow rate of argon gas blowing at the bottom of the ladle during tapping is controlled at 200NL / min, and the bottom blowing and stirring are continued for 3.8 minutes after all the alloy and slag adjusting agent are added;

[0041] 2) The ladle is transferred to the VOD station, the VOD entry temperature is 1625°C, and the T.Fe+MnO is 2.00%. After the ladle is placed in place, turn on the bottom blowing and start vacuuming. The flow rate of the bottom blowing argon and hydrogen gas mixture is 50NL / min, the capacity ratio of argon to hydrogen is 9:1, ...

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PUM

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Abstract

The invention discloses a boron bearing steel smelting technological method for improving the boron yield. The method sequentially comprises the steps that S1, the converter process is implemented, specifically, alloy is added in the steel tapping process for deoxidation alloying, after steel tapping is finished, a slag modifier and lime are added into the ladle slag surface to control the slag component and the oxygen potential, argon is blown into the bottom of a steel ladle in the whole steel tapping process, and molten steel is kept being stirred instead of boiling strongly; S2, the VOD process is implemented, specifically, after the converter process is finished, the molten steel is conveyed to VOD for treatment, the steel ladle is connected with bottom blowing after being transported in place, vacuumizing treatment is conducted, degassing and inclusion removal are conducted while the high-vacuum state is kept, ferroboron is added in the later period of the VOD process, high-vacuum circulation continues to be kept after the ferroboron is added, and finally, the molten steel is conveyed out to be subjected to the continuous casting process; and S3, the continuous casting process is implemented, specifically, protective casting is adopted, and nitrogen increment and secondary oxidation of the molten steel are prevented. According to the boron bearing steel smelting technological method, the technological process is short, the production cost is low, operation is easy, the boron yield is high, and the content of boron in the molten steel is stable.

Description

technical field [0001] The application belongs to the technical field of steelmaking, and in particular relates to a boron-containing steel smelting process method for increasing boron yield. Background technique [0002] Boron has a strong ability to improve the hardenability of steel, and a small amount of boron can double the hardenability of steel. The effect of 0.0010% to 0.0030% boron in steel can be equivalent to 0.6% manganese, 0.7% chromium, 0.5% molybdenum and 1.5% nickel respectively. Therefore, its ability to improve hardenability is hundreds of times or even above that of the above alloy elements. Thousand times, only a very small amount of boron can save a lot of precious alloying elements. Generally, the effect of alloying elements on improving hardenability increases with the increase of their content in steel, but there is an optimal content of boron in steel, too much or too little is not good for improving hardenability, and the content is very small, abo...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C5/28C21C7/10B22D11/11
CPCB22D11/11C21C5/28C21C7/10C22C33/04
Inventor 赵家七邹长东周青峰蔡小锋皇祝平
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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