Equipment and process for casting multi-branch steel ingot with vacuum spill method and liquid steel

Abstract

The present invention relates to a device and a process adopting the liquid steel vacuum overflow method to cast a plurality of ingots, which belongs to the technical field of the vacuum casting ingot, and aims at overcoming the weaknesses that the liquid steel is secondarily oxidized when the liquid steel is poured into the pouring box in vacuum pouring way, and the pouring time is long, the device is large, etc. The desaeration slide gate nozzle steel ladle is adopted for direct pouring, and after the liquid steel is poured to a specified height at a primary mould cap port: proposal A and proposal B, the liquid steel flows into the next or the next two moulds through one or two single-way overflow grooves so as to pour all steel ingots. Proposal C, the liquid steel pours all steel ingots through the primary or a plurality of balancing overflow grooves with the same height of the bottom marker. Proposal D, the liquid steel pours all steel ingots through a plurality of single-way overflow grooves on the primary cap and a plurality of balancing overflow grooves with the same height of the bottom marker among the rest caps. Adopting each proposal, the height of the cap port of the ingot is basically the same. The process of the present invention has short general pouring time, and is safe and smooth, and has good quality of the steel ingot, and has simple device and less invenatment, and can save the energy. The process of the present invention is applicable to vacuum pouring a plurality of quality steel ingots that are used for rolling and forging in the special steel and heavy machine industries.

Description

technical field [0001] The invention belongs to the technical field of molten steel vacuum ingot casting equipment and technology. Background technique [0002] Most of the existing molten steel mold casting methods are cast in the atmosphere. The molten steel stream and the oxygen, nitrogen and water vapor in the atmosphere produce secondary oxidation, generate a large number of non-metallic inclusions, and absorb hydrogen and nitrogen. Serious pollution affects the quality of steel. [0003] In order to prevent the molten steel from being in contact with the atmosphere during the casting process, in addition to adopting argon protection casting measures, the most important method is to cast steel ingots in a vacuum chamber. The current methods mainly include: [0004] 1. Vacuum casting method, also known as TD-VC method [0005] The molten steel ladle that has been refined by LF furnace and VD vacuum degassed or only refined by LF furnace is first injected into the plug...

AI Technical Summary

Problems solved by technology

[0006] (1) When the ladle injects molten steel into the tundish, it is still subjected to secondary oxidation by the atmosphere, generating a large amount of non-metallic inclusions and absorbing a large amount of gas. Although hydrogen can be removed during vacuum casting, the non-metallic inclusions cannot be removed, which affects the quality of the steel. quality

[0007] (2) The scouring of tundish lining, plug rod sleeve brick, plug head brick and nozzle brick will also bring inclusions to molten steel

[0008] (3) Only one large steel ingot can be cast in one or more packages, which limits this method to be used only in heavy machinery industry manufacturers to produce high-quality large steel ingots with a small number of counts for forging important forgings, and often requires Vacuum casting steel ingots with large volume and small tonnage are not easy to arrange production

[0015] Another disadvantage is that the stopper rod is opened and closed many times under vacuum conditions (each stop pouring for about 30 seconds), and the possibility of accidents that the stopper rod cannot be opened or closed increases.

[0016] Another disadvantage is that the equipment is heavy and occupies too much volume in the vacuum ingot casting chamber, and the required steam jet pump pumping capacity needs to be increased.

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