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RH refining method of low-carbon stainless steel

A stainless steel refining technology, applied in RH hydrogen blowing refining of low-carbon high-alumina stainless steel, RH hydrogen blowing refining of low-carbon stainless steel, to reduce quantity and particle size, improve product quality, and reduce alumina inclusions Effect

Active Publication Date: 2019-04-16
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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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 an RH refining method of low-carbon stainless steel. Under the condition that the incoming carbon and oxygen contents are high, the carbon, oxygen and hydrogen contents of molten steel can be fast reduced to the ultralow level through high-temperature preliminary decarburization, oxygen blowing forced decarburization, hydrogen blowing deoxygenation and vacuum degassing, meanwhile, chromium keeps the high yield, the slag amount can be reduced, aluminum is not used for deoxygenation, and aluminum oxide occluded foreign substances are reduced. The RH refining method can befurther used for smelting low-carbon high-aluminum stainless steel, the aluminum adding process and the hydrogen blowing process cooperate, aluminum is added after hydrogen blowing is circulated for aperiod of time, hydrogen blowing continues, the content of acid soluble aluminum in the steel can be increased, aluminum consumption can be reduced, and the number and particle size of the aluminum oxide occluded foreign substances are reduced. By means of the RH refining method of the low-carbon stainless steel, the cleanliness degree of the molten steel can be improved, nozzle clogging in the continuous casting process is avoided, the production efficiency is improved, the production cost is reduced, and the product quality is improved.

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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IPC IPC(8): C21C7/10C21C7/072C21C7/06C21C7/068
CPCC21C7/06C21C7/0685C21C7/072C21C7/10
Inventor 李华英李怡宏李玉贵刘光明王晋斌
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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