Method for removing inclusions in vacuum of RH single molten steel

A technology of inclusions and vacuum, which is applied in the field of steelmaking, can solve the problems of difficult removal of large and small impurities, and achieve the effects of fast decomposition, large amount of CO2, and high safety factor

Inactive Publication Date: 2020-12-01
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is urgent to design a method for removing inclusions in RH single-unit molten steel under vacuum to solve the problem of difficult removal of large and small impurities in existing molten steel

Method used

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Embodiment Construction

[0018] The technical solutions in the embodiments of the present invention are clearly and completely described in further detail below. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] The invention discloses a method for removing inclusions under vacuum of RH single-unit molten steel, which has low cost, simple materials, convenient operation, and is conducive to rapid floating of inclusions to achieve the effect of removing inclusions.

[0020] The working principle realized by the present invention: under vacuum state, add dry high-calcium limestone (CaCO 3 content≥95%), high-calcium limestone decomposes rapidly in high-temperature molten steel, and produces a large amount of CO 2 gas, CO 2 The gas bubbles enter the ladle along with the high-speed circulating molten steel, and the bubbles quickly float ...

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Abstract

The invention discloses a method for removing inclusions in vacuum of RH single molten steel. The method comprises the following steps that (1), the vacuum degree of a vacuum system is controlled to be 6-8KPa at the initial stage of RH vacuumizing; (2), 50-80kg of dried high-calcium limestone is weighed from a stock bin to a vacuum hopper; (3), the weighed high-calcium limestone in the vacuum hopper is fed into a vacuum tank through an alloy chute; (4), it is observed that the CO2 concentration in a waste gas analyzer reaches the level before the first batch of high-calcium limestone is added;and (5), the operation of b, c and d is repeated for 3-4 times. According to the method for removing the inclusions in vacuum of the RH single molten steel, raw materials are easy to obtain, the costis low, after the high-calcium limestone is rapidly decomposed in the high-temperature molten steel, a large amount of CO2 is generated, in the upward floating and overflowing process, tiny inclusions are promoted to collide and grow up, the inclusions are adsorbed to the surfaces of bubbles, and in the bubble overflowing process, the inclusions are brought out of steel slag on the surface of themolten steel and adsorbed by the steel slag.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a method for removing inclusions under vacuum of RH single-connected molten steel. Background technique [0002] In recent years, with the improvement of my country's steelmaking, refining and continuous casting technology, the control level of inclusions in steel is getting better and better, and the cleanliness of molten steel is getting higher and higher. However, due to the continuous improvement of the service conditions and uses of steel, the requirements for inclusions in steel are becoming more and more stringent. [0003] The criteria for judging inclusions in steel are mainly based on the size and quantity of inclusions. Generally, those with a size larger than 50 μm are called large inclusions, and such inclusions have a greater impact on the properties of steel; for inclusions below 50 μm, if If its quantity is too large, or if it is locally concentrated in the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/04
CPCC21C7/04C21C7/10
Inventor 刘建伟张永青胡勤东薛燕张英杰丁中赵珉刘荣营赵统国许峰
Owner SD STEEL RIZHAO CO LTD
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