Method for evaluating vacuum inclusion removal capacity of RH refining furnace

A technology for inclusions and refining furnaces, applied in the field of RH refining furnace performance evaluation, can solve the problems of lack of systematic quantitative evaluation of process design time and molten steel inclusion level, prominent contradiction between RH process design time and production matching, etc.

Inactive Publication Date: 2020-07-17
NANJING IRON & STEEL CO LTD
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  • Abstract
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Problems solved by technology

[0003] At present, in order to control the level of inclusions in molten steel, the RH furnace process time set by steel mills is mostly qualitative evaluation. The process design time and the level of molten steel inclusions lack systematic quantitative evaluation. The main purpose is to extend the RH refining furnace vacuum process design time to ensure that the molten steel inclusions level, which makes the RH process design time and production matching contradiction prominent

Method used

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  • Method for evaluating vacuum inclusion removal capacity of RH refining furnace
  • Method for evaluating vacuum inclusion removal capacity of RH refining furnace
  • Method for evaluating vacuum inclusion removal capacity of RH refining furnace

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Experimental program
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Embodiment 1

[0025] A method for evaluating the vacuum removal capability of RH refining furnaces includes the following steps:

[0026] 1. Study the effect and extent of increasing the air flow on the removal of inclusions in the vacuum treatment stage RH

[0027] As shown in Table 1, according to the lifting gas flow rate 100, 120, 140Nm 3 / h for the test, in addition to increasing the gas flow during the test, no other conditions are changed. Such as Figure 1-4 As shown, when the flow rate is 120Nm 3 / h than 100Nm 3 / h, the liquid level fluctuates more obviously, and there is no obvious splashing phenomenon, the shape of the vacuum chamber maintains a better shape, and the flow rate is 140Nm 3 / h, the obvious splashing phenomenon is produced, and the shape of the bottom of the vacuum chamber changes obviously, which has caused nodules such as Figure 4 Shown.

[0028] Table 1 Test plan for increasing gas flow

[0029] Test planFlow rate Nm 3 / h

Insertion depth mm Other process parameter...

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Abstract

The invention discloses a method for evaluating the vacuum inclusion removal capacity of an RH refining furnace. Technological factors influencing the inclusion removal effect of the RH refining furnace, such as gas flow increasing and dip pipe insertion depth, are studied; the relation between the inclusion level of the molten steel and the RH process time is quantitatively evaluated, and efficient production of the RH process and clean production of the molten steel are achieved. A good popularization value is achieved for improving the production quality of modern iron and steel enterprises.

Description

Technical field [0001] The invention belongs to the technical field of iron and steel, and relates to a method for evaluating the performance of an RH refining furnace. Background technique [0002] The RH refining furnace has a good function of deoxidizing and removing inclusions. The removal process of deoxidizing inclusions is mainly divided into four processes: reaction, nucleation, collision growth and removal. Understanding the changing law of inclusions in the RH refining furnace has important guiding significance for improving the ability of the RH refining furnace to remove inclusions. [0003] At present, in order to control the level of molten steel inclusions in steel mills, most of the set RH furnace process time is qualitative evaluation. The process design time and molten steel inclusion level lack a systematic quantitative evaluation, mainly to extend the vacuum process design time of the RH refining furnace to ensure molten steel inclusions Level, the contradictio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/2022G01N33/202G01N23/2251G01N23/2202C21C7/10
CPCG01N33/2022G01N33/202G01N23/2251G01N23/2202C21C7/10Y02P10/20
Inventor 吴伟勤曹余良陈从俊聂真来贾攀常运合
Owner NANJING IRON & STEEL CO LTD
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