A steel ingot mold and pouring method for preparing a large single-weight steel ingot

Abstract

The invention discloses an ingot mold for preparing a steel ingot with a large single weight and a pouring method, belonging to the technical fields of steel ingot pouring equipment and pouring methods. The ingot mold is designed to be dynamically opened and closed, the steel ingot is dynamically pressed down in a steel ingot cooling process through the force of a hydraulic ejector rod, so that looseness in the steel ingot is eliminated; accelerated cooling of the steel ingot is implemented by the cooling water in the ingot mold through a heat conduction effect of the ingot mold, and a square ingot with a good interior tissue is finally prepared. According to the ingot mold for preparing the steel ingot with the large single weight and the pouring method, improvement of the interior tissue of the steel ingot can be promoted, the cooling uniformity of the steel ingot is improved, the feeding deficiency of a heart part of the steel ingot is reduced, the horizontal restraint of the surface of the steel ingot is increased, and the probability of cracks on the surface of the steel ingot is reduced. The pouring problem of the steel ingot with the large thickness, which troubles iron and steel enterprises for a long time, is solved, the pouring quality of the steel ingot with the large thickness is greatly improved, a bottleneck for restricting production of a steel plate with a large-thickness specification is broken, the production efficiency is greatly improved, and the economic benefit and the social benefit are remarkable.

Description

technical field [0001] The invention relates to a steel ingot mold for preparing a large steel ingot by cooling with water flow and a pouring method using the steel ingot mold, belonging to the technical field of steel ingot pouring equipment and pouring methods. Background technique [0002] Since the development of iron and steel metallurgy, the continuous casting large billet production technology has made great progress, but extra large and thick steel plates or parts can only be produced by forging or rolling large steel ingots. Compared with continuous casting slabs, steel ingots have inherent disadvantages: first, in the air-cooled state, the heat dissipation of steel ingots is slow, and due to the low cooling intensity of steel ingots, the core of steel ingots is loose and segregated seriously, and the internal columnar crystals are serious and the structure is coarse; secondly, ordinary steel ingots It is a round ingot or a flat ingot, and the steel plate produced b...

AI Technical Summary

Problems solved by technology

Compared with continuous casting slabs, steel ingots have inherent disadvantages: first, in the air-cooled state, the heat dissipation of steel ingots is slow, and due to the low cooling intensity of steel ingots, the core of steel ingots is loose and segregated seriously, and the internal columnar crystals are serious and the structure is coarse; secondly, ordinary steel ingots It is a round ingot or a flat ingot, and the steel plate produced by the round steel ingot is unevenly deformed on the entire plate plane, and the shape of the plate is not easy to control

The flat steel ingot has improved in these two aspects, but the head is big and the tail is small, and the rolling process is still difficult to control, which increases the difficulty of vertical roll rolling and surface smoothing during rolling, and the steel ingot is prone to uneven cooling speed during the cooling process. Cause surface cracks; moreover, in the pouring process, the lower part of the steel ingot solidifies first, so shrinkage cavity defects caused by insufficient feeding are prone to appear in the center of the upper part of the steel ingot, especially when water is passed through for cooling, the billet shell of the steel ingot is faster Formation, more likely to form underfeeding

The above defects lead to low yield of steel ingots and complex production process. High-performance large-thickness steel plates require secondary billeting to yield lower yields.

[0003] Some domestic wide and thick plate factories try to use water cooling to produce large-scale steel ingots, but the application is not successful. The main reason is that the surface of the steel ingots is severely cracked after the water cooling strength is increased, and the scrap rate is too high, which makes it impossible to popularize and apply.

At present, the production of large-thickness steel plates is still restricted, and the production of high-performance thick steel plates can only be produced by electroslag remelting, which is more costly.

Images