Water-cooling die casting production process of plate blank used for medium plate

Abstract

The invention discloses a water-cooling die casting production process of a plate blank used for a medium plate, which is characterized in that the production process adopts the protective pouring of argon gas in the overall process of the pouring so as to realize that the contact of molten steel with the air is isolated in the pouring process after the molten steel flows out from a water gap; the protective pouring of solid covering slag is adopted to ensure the surface quality of a casting blank; and an ascending hole of flow steel is regulated to enable the molten steel to stably ascend in water-cooling die casting, and the surface quality of the casting blank is ensured. The invention avoids the defects of skull patch, pits and the like of the surface and the defect of slag entrapment when the water-cooling die casting is adopted to produce the blank of the medium plate, and the adopted protective pouring reduces the secondary oxidation of the molten steel in the pouring process, has a certain adsorption function to inclusion and ensure the quality of the blank of the medium plate. The invention is suitable for the production process of the blank of a high-alloy steel medium plate of die steel with high requirement.

Description

technical field [0001] The invention relates to a metallurgical process, in particular to a water-cooled die-casting production process for slabs for medium-thick steel plates with high standards and high requirements. Background technique [0002] At present, the most commonly used blanks for medium and thick plates are the following three: [0003] The first is the traditional die-casting slab. This ingot casting method can produce high-quality slabs, but the mold consumption is high, and defects such as segregation and shrinkage are prone to occur; Subsequent furnace loading and rolling will result in low production efficiency; at the same time, due to the low utilization rate of the cap opening and the high cost of casting ingots, the working conditions of the workers are harsh. [0004] The second is continuous casting machine slab, which is more commonly used at present. The continuous casting machine has many supporting equipment, complex mechanism, large investment,...

AI Technical Summary

Problems solved by technology

[0003] The first is the traditional die-casting slab. This ingot casting method can produce high-quality slabs, but the mold consumption is high, and defects such as segregation and shrinkage are prone to occur; The subsequent furnace loading and rolling will lead to low production efficiency; at the same time, due to the low utilization rate of the cap opening and the high cost of casting ingots, the working conditions of the workers are poor

[0004] The second is continuous casting machine slab, which is more commonly used at present. The continuous casting machine has many supporting equipment, complex mechanism, large investment, and there are many internal quality problems in the casting slab. The temperature of molten steel is strict during pouring, and pouring is difficult to control. , especially in the production of high-alloy steel and high-demand die steel, the continuous casting machine cannot be used to cast qualified blanks

The disadvantage is that there are serious defects such as surface turning pits due to lack of protective pouring, or improper protective pouring methods and fast cooling of the slab resulting in slag curling defects

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