A Calcium Treatment Method in the Vacuum Process of Rh Refining Furnace

A refining furnace and calcium treatment technology, applied in the field of iron and steel metallurgy, can solve the problems of secondary oxidation of molten steel, contaminated molten steel, exposed molten steel, etc., achieve sufficient denaturation, improve cleanliness, and reduce production costs

Active Publication Date: 2021-01-26
NANJING IRON & STEEL CO LTD
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  • Claims
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Problems solved by technology

However, since calcium is an active metal with a low melting point, the molten steel reacts extremely violently after feeding the calcium-containing wire after refining, resulting in serious exposure of the molten steel, which may cause secondary oxidation of the molten steel and pollute the refined molten steel

Method used

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  • A Calcium Treatment Method in the Vacuum Process of Rh Refining Furnace
  • A Calcium Treatment Method in the Vacuum Process of Rh Refining Furnace
  • A Calcium Treatment Method in the Vacuum Process of Rh Refining Furnace

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Embodiment

[0021] In this embodiment, X70 steel is selected, produced in a 150-ton RH vacuum refining furnace, and calcium-silicon alloy is used for calcium treatment. The main chemical composition of the steel is shown in Table 1. The entire smelting process is controlled as follows:

[0022] Table 1 X70 chemical composition (%)

[0023]

[0024] (1) Calcium silicon alloy preparation. The composition of silicon-calcium alloy is shown in Table 2.

[0025] Table 2 Calcium silicon alloy composition (%)

[0026]

[0027] Particle size: (10-50) mm is 96%, (0-10) mm is 1%, (50-60) mm is 3%.

[0028] (2) RH actually arrived at the molten steel composition. See Table 3.

[0029] Table 3 RH Arrival Molten Steel Composition (%)

[0030]

[0031] (3) RH vacuum calcium treatment, the vacuum degree is 98Pa, and 50Kg of silicon-calcium alloy is added to each furnace. After the addition, the vacuum degree is kept at 150Pa for 5 minutes. During the whole vacuum process, the flow rate of ...

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Abstract

The invention discloses a calcium treatment method in the vacuum process of an RH refining furnace. Through the vacuum cycle treatment process of the RH vacuum refining furnace, the RH alloy silo is used to add a calcium-containing alloy to the molten steel circulating in a vacuum chamber to modify molten steel inclusions and calcium treatment. The process is stable and controllable. After the treatment, the calcium composition of molten steel is controlled stably and accurately. The calcium recovery rate reaches more than 20%. The molten steel inclusions are fully denatured. The invention successfully solves the problem of secondary oxidation caused by the tumbling and exposure of molten steel when the pure calcium wire is fed after the vacuum treatment of the RH refining furnace, stabilizes the calcium treatment effect, reduces the content of inclusions, improves the cleanliness of the molten steel and passes the flaw detection of the finished steel plate The production rate is reduced, and the economic benefit is greatly improved.

Description

technical field [0001] The invention belongs to a steelmaking process in the field of iron and steel metallurgy, and relates to a process for calcium treatment of molten steel. Background technique [0002] With the development of science and technology, the requirements for the performance of steel are getting higher and higher. In order to meet the needs of the market, the iron and steel metallurgical process uses aluminum deep deoxidation (aluminum killed steel) to greatly reduce the residual oxygen content in molten steel to improve the various properties of steel. performance. However, a large amount of aluminum deoxidation is used, and a large number of high-melting alumina inclusions are formed in molten steel. 2 o 3 Compared with the steel matrix, the inclusions are hard and brittle, easily broken during the rolling process and distributed continuously along the rolling direction, thus causing serious defects in the steel. In order to remove such inclusions and el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/00
CPCC21C7/0006C21C7/0056C21C7/10C21C2007/0062
Inventor 曹余良周贺贺吴国平
Owner NANJING IRON & STEEL CO LTD
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