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Control method for preventing nozzle clogging in casting process of ultra-low carbon-aluminium deoxidized molten steel

A technology of carbon-aluminum deoxidized molten steel and a control method, which is applied to manufacturing tools, casting equipment, manufacturing converters, etc., can solve the problems of unfavorable production organization arrangement, reduce the oxygen content of molten steel, and high production costs, and reduce the oxidation of top slag, The effect of preventing secondary oxidation of molten steel and improving pourability

Inactive Publication Date: 2013-12-18
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: (1) There are many smelting processes; (2) In the ladle furnace top slag modification and heating treatment, the production cost is high, which is not conducive to the production organization arrangement; (3) After the ladle furnace heating treatment It will increase the carbonization of molten steel and increase the difficulty of RH decarburization; (4) The oxygen content of molten steel will be reduced in the ladle furnace top slag modification and heating treatment, resulting in an increase in the amount of oxygen blowing for RH decarburization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Steel type HIFI smelting, liquidus temperature 1536 ℃, 250 tons of ladle, adopts the process path of molten iron desulfurization treatment-converter smelting-converter tapping-RH vacuum treatment-double-strand slab continuous casting; each process control adopts the following steps:

[0021] Hot metal desulfurization treatment process, using a pretreatment device to spray magnesium particles and lime powder to the molten iron in the iron ladle with nitrogen as the carrier gas for desulfurization, remove the desulfurization slag from the molten iron, and put the molten iron into the converter for smelting;

[0022] In the converter smelting process, the converter is loaded with 25.1 tons of scrap steel and 275 tons of desulfurized hot metal. The blowing method is carried out by a composite blowing method with top-blown oxygen and bottom-blown argon stirring. During the blowing process, lime is added to make slag. The basicity is controlled at 4.0; at the end of blowing, [...

Embodiment 2

[0027] Steel type HIFI smelting, liquidus temperature 1536 ℃, 250 tons of ladle, adopts the process path of molten iron desulfurization treatment-converter smelting-converter tapping-RH vacuum treatment-double-strand slab continuous casting; each process control adopts the following steps:

[0028] Hot metal desulfurization treatment process, using a pretreatment device to spray magnesium particles and lime powder to the molten iron in the iron ladle with nitrogen as the carrier gas for desulfurization, remove the desulfurization slag from the molten iron, and put the molten iron into the converter for smelting;

[0029] In the converter smelting process, the converter is loaded with 24.8 tons of scrap steel and 280 tons of desulfurized hot metal. The blowing method is carried out by a combined blowing method with top-blown oxygen and bottom-blown argon stirring. During the blowing process, lime is added to make slag. Alkalinity is controlled at 6.0; at the end of blowing, [C]=...

Embodiment 3

[0034] Steel type HIFI smelting, liquidus temperature 1536 ℃, 250 tons of ladle, adopts the process path of molten iron desulfurization treatment-converter smelting-converter tapping-RH vacuum treatment-double-strand slab continuous casting; each process control adopts the following steps:

[0035] Hot metal desulfurization treatment process, using a pretreatment device to spray magnesium particles and lime powder to the molten iron in the iron ladle with nitrogen as the carrier gas for desulfurization, remove the desulfurization slag from the molten iron, and put the molten iron into the converter for smelting;

[0036] In the converter smelting process, 25.3 tons of scrap steel and 279 tons of desulfurized hot metal are loaded into the converter, and the combined blowing method of blowing oxygen and argon at the bottom is used for blowing. During the blowing process, lime is added to make slag. The basicity is controlled at 5.0; at the end of blowing, [C]=0.040%, [Si]=0.000%,...

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Abstract

The invention relates to a control method for preventing nozzle clogging in a casting process of ultra-low carbon-aluminium deoxidized molten steel, and belongs to the technical field of a steelmaking technology. The technical scheme is that a process path of molten iron desulfurization treatment, converter smelting, converter steel tapping, Rheinstahl Heraeus (RH) vacuum treatment, and continuous casting of a dual-flow slab is adopted to smelt ultra-low carbon steel, so that the castability of the ultra-low carbon-aluminium deoxidized molten steel is improved; the oxygen content of the molten steel of a converter blowing end-point, the carbon content and the temperature of the endpoint are reasonably controlled; a favorable condition is provided for RH vacuum decarburization; pouring is protected in a continuous casting manner; secondary oxidization of the molten steel is prevented by adopting blowing-argon sealing protection of a long-nozzle and a submersed nozzle; secondary oxidization of the molten steel is prevented by using an alkaline covering agent; an occluded foreign substance in the molten steel is well adsorbed; the castability of the ultra-low carbon-aluminium deoxidized molten steel is improved; the targets of no choking of the submersed nozzle and no change of the submersed nozzle in a complete multi-furnace continuous casting process are achieved. Thus, the effect on a casting blank caused by replacement of the submersed nozzle is avoided.

Description

technical field [0001] The invention relates to a control method for preventing nozzle clogging in the casting process of ultra-low carbon aluminum deoxidized molten steel, and belongs to the technical field of steelmaking technology. Background technique [0002] Chinese invention patent 200910084426.9 discloses a method for smelting ultra-low carbon steel production, which adopts the process route of molten iron desulfurization pretreatment-converter smelting-converter tapping-ladle furnace treatment-RH vacuum treatment-slab continuous casting, and proposes A method to solve the clogging of the continuous casting nozzle is proposed. The characteristics of the invention are: no deoxidation after molten iron pretreatment and converter smelting, after top slag modification and temperature rise operation in LF furnace, vacuum decarburization and deoxidation After the completion, the deep vacuum treatment time is 10-18 minutes, and the molten steel is calmed for 40-70 minutes a...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/10B22D41/02B22D11/111
Inventor 彭兆丰程迪谷凤龙刘守显李守华李太全王恩睿武海红胡朝辉
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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