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A kind of rh refining method of low carbon stainless steel

A stainless steel and refining technology, which is applied in the fields of RH blowing refining of low-carbon and high-aluminum stainless steel, and RH blowing refining of low-carbon stainless steel, to achieve the effect of reducing production cost, slag amount, and alumina inclusions

Active Publication Date: 2021-03-05
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In short, there is no research and report on RH hydrogen blowing refining for ultra-low carbon stainless steel, especially low carbon high aluminum stainless steel in the prior art. How to improve the decarburization rate, reduce the loss of chromium, and reduce the The amount of slag, the reduction of inclusions, the control of hydrogen content, and the improvement of the purity of molten steel have become the focus of attention. The solutions to these problems can improve the production efficiency of ultra-low carbon stainless steel, reduce production costs, and improve product quality

Method used

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  • A kind of rh refining method of low carbon stainless steel
  • A kind of rh refining method of low carbon stainless steel
  • A kind of rh refining method of low carbon stainless steel

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Experimental program
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Effect test

Embodiment 1

[0044] A kind of RH refining method of low-carbon stainless steel, mainly comprises the following steps:

[0045] (1) Argon nozzles and hydrogen nozzles are arranged on the riser of the RH dipping tube, and a top blowing oxygen lance is arranged in the vacuum chamber;

[0046] (2) Hoist the ladle with molten steel to the RH workstation. The carbon content of the molten steel is 302ppm, the oxygen content is 652ppm, and the chromium content is 12%. After temperature measurement and oxygen determination, the temperature of the molten steel entering the RH station is controlled at 1601°C, and then the vacuum pump is started. Vacuum to 8kPa, blow argon at the same time to circulate the molten steel for 5 minutes, and control the flow rate of the lifting gas at 150m 3 / h;

[0047] (3) Turn on the multi-stage vacuum pump to evacuate to 1kPa, blow oxygen with the oxygen reducing gun, and control the oxygen flow at 1500Nm 3 / h, the total amount of oxygen blowing is controlled at 600...

Embodiment 2

[0053] A kind of RH refining method of low-carbon stainless steel, mainly comprises the following steps:

[0054] (1) Argon nozzles and hydrogen nozzles are arranged on the riser of the RH dipping tube, and a top blowing oxygen lance is arranged in the vacuum chamber;

[0055] (2) Hoist the ladle with molten steel to the RH workstation. The carbon content of the molten steel is 453ppm, the oxygen content is 554ppm, and the chromium content is 18%. After temperature measurement and oxygen determination, the temperature of the molten steel entering the RH station is controlled at 1636°C, and then the vacuum pump is started. Vacuum to 10kPa, blow argon at the same time to circulate the molten steel for 3 minutes, and control the flow rate of the lifting gas at 180m 3 / h;

[0056] (3) Turn on the multi-stage vacuum pump to evacuate to 0.8kPa, blow oxygen with the oxygen-reducing lance, and control the oxygen flow at 2000Nm 3 / h, the total amount of oxygen blowing is controlled a...

Embodiment 3

[0062] A kind of RH refining method of low-carbon stainless steel, mainly comprises the following steps:

[0063] (1) Argon nozzles and hydrogen nozzles are arranged on the riser of the RH dipping tube, and a top blowing oxygen lance is arranged in the vacuum chamber;

[0064] (2) Hoist the ladle with molten steel to the RH workstation. The carbon content of the molten steel is 396ppm, the oxygen content is 583ppm, and the chromium content is 14.7%. After temperature measurement and oxygen determination, the temperature of the molten steel entering the RH station is controlled at 1621°C, and then the vacuum pump is started. Vacuum to 9kPa, blow argon at the same time to circulate the molten steel for 4 minutes, and control the flow rate of the lifting gas at 150-220m 3 / h;

[0065] (3) Turn on the multi-stage vacuum pump to evacuate to 0.9kPa, blow oxygen with the oxygen-reducing lance, and control the oxygen flow at 1800Nm 3 / h, the total amount of oxygen blowing is control...

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Abstract

The invention provides a RH refining method for low-carbon stainless steel. In the case of high carbon and oxygen content in the station, the steel can be quickly decarburized through high-temperature preliminary decarburization, oxygen-blowing forced decarburization, hydrogen-blowing deoxygenation, and vacuum degassing. The carbon, oxygen, and hydrogen contents of the liquid are reduced to an ultra-low level, and at the same time, the chromium is kept at a high yield rate, the amount of slag is reduced, and aluminum oxide inclusions are reduced without using aluminum deoxidation; the present invention is further applicable For smelting low-carbon high-aluminum stainless steel, the process of adding aluminum and hydrogen blowing is coordinated. After a period of hydrogen blowing cycle, adding aluminum, and then continuing to blow hydrogen, can increase the content of acid-soluble aluminum in the steel, reduce the loss of aluminum, and reduce the inclusion of alumina amount and particle size. The RH refining method of the low-carbon stainless steel of the present invention can improve the cleanliness of molten steel, avoid nozzle nodulation in the continuous casting process, improve production efficiency, reduce production cost and improve product quality.

Description

technical field [0001] The invention relates to the field of refining outside the metallurgical furnace, in particular to an RH hydrogen-blowing refining method for low-carbon stainless steel, and more particularly to a RH hydrogen-blowing refining method for low-carbon high-aluminum stainless steel. Background technique [0002] With the tight supply of nickel resources, ferritic stainless steel, which is less dependent on nickel resources, has been paid more and more attention by the society. In order to ensure its corrosion resistance and weld ductility, ferritic stainless steel requires interstitial elements carbon and nitrogen. The lower the content, the better. When the total content of carbon and nitrogen in ferritic stainless steel is less than 0.015% (150ppm), the above-mentioned properties will be greatly improved and enhanced. Since the chromium content of ferritic stainless steel is 11%-30%, the presence of chromium greatly reduces the activity of carbon and oxyg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/072C21C7/06C21C7/068
CPCC21C7/06C21C7/0685C21C7/072C21C7/10
Inventor 何奕波黄闻战李怡宏李华英李玉贵刘光明王晋斌
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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