A method and device for multi-core reduction and multi-package co-casting composite casting of large steel ingots

Abstract

The invention discloses a multi-core reducing multi-ladle co-casting method and device for composite casting large composite steel ingots. The multi-core reducing multi-ladle co-casting method comprises the steps of selecting core blanks, regulating the temperatures of the core blanks, re-removing scales on the surfaces of the core blanks, assembling the core blanks and ingot molds, reducing oxide scales on the surfaces of the core blanks, casting and compositing and cooling composite ingots. The device adopted by the method comprises a tank body, a reducing gas inlet, a heat preservation layer, bolts, a bin door, risers, heat insulation plates, the steel ingot molds, the core blanks, shims, a trolley, an inert gas inlet, a bottom heat insulation layer, an exhaust port, an explosion-proof end cap, a vacuum exhaust valve, a vacuum pump, circulating fans, riser bricks, casting channels, sealing valve rods, sealing valve bodies, sealing valve plates, sealing asbestos, sliding nozzles and steel ladles. Large and ultra-large molded steel ingots which cannot be produced by means of an orthodox casting method can be manufactured. The steel ingots manufactured by means of the multi-core reducing multi-ladle co-casting method and device has the advantages of being low in production cost, high in solidification speed, small in internal segregation, even in components and high in finished product rate.

Description

technical field [0001] The invention relates to a production method and a device for an alloy steel ingot, in particular to a method and a device for multi-core reduction, multi-pack co-casting and composite casting of a large steel ingot. Background technique [0002] At present, the production methods of large and extra-large steel ingots are still mainly die casting and electroslag remelting, but both production methods have some disadvantages. When using the die casting method to produce large steel ingots, the solidification speed slows down with the increase of the ingot shape, which brings a series of quality problems, such as various segregation intensification, porosity and shrinkage cavity increase, and non-metallic inclusions increase , Columnar crystals are more developed, and equiaxed crystals are thicker, which also leads to a substantial decline in the yield of steel ingots. In order to improve the internal quality of large steel ingots, people developed the ...

AI Technical Summary

Problems solved by technology

However, this method is more cumbersome to fabricate, and the bar is not easy to fix, and the weight ratio of the bar to the ingot needs to be controlled within the range of 0.8% to 3%.

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