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Method for improving internal quality of cast ingot and heating insulation box

A technology of heating, heat preservation and internal quality, applied in the field of iron and steel metallurgy, can solve the problems of unsatisfactory shrinkage effect, difficult operation, porosity and segregation of ingots, and achieve shrinkage defects, good feeding effect, improvement of porosity and segregation. The effect of segregation

Active Publication Date: 2021-04-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of unsatisfactory improvement of ingot shrinkage cavity existing in the prior art, great potential safety hazards, high cost and difficult operation, and provide a method for improving the internal quality of ingot and heating and heat preservation box
The invention adopts the upcasting method for pouring, by heating the steel ingot mold and the riser brick to a suitable temperature before pouring, and then controlling the pouring speed in sections, and controlling the amount of molten steel in the riser, so as to solve the problem of steel ingot casting when using the upcasting method Internal defects such as shrinkage cavity, porosity and segregation

Method used

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  • Method for improving internal quality of cast ingot and heating insulation box

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] This embodiment is used to illustrate the ingot pouring process of superalloy GH4169 steel.

[0069] The specific operation steps are as follows:

[0070] (1) The steel ingot mold 1, riser brick 2 and sprue brick 3 required for the pouring process are placed in a heating furnace, baked at 400°C for 5 hours and taken out, and then the steel ingot mold 1 is placed in a heating insulation box, Place riser brick 2 and sprue brick 3 on the upper end of steel ingot mold 1 in sequence, move the tapping trolley, move steel ingot mold 1, riser brick 2 and sprue brick 3 to the lower end of the crucible’s tapping gate, align the ingot mold 1 and riser brick 2 are heated to 650°C, then power off and keep warm, waiting for tapping;

[0071] (2) Heat and smelt the raw materials for smelting GH4169 steel in an induction furnace. After the molten steel is melted, deoxidize and refine the molten steel, then add alloys for alloying, and adjust the temperature of the molten steel until t...

Embodiment 2

[0077] This embodiment is used to illustrate the ingot pouring process of GH4065 steel.

[0078] The specific operation steps are as follows:

[0079](1) The steel ingot mold 1, riser brick 2 and sprue brick 3 required for the pouring process are placed in a heating furnace, baked at 450°C for 4.5 hours and then taken out, and then the steel ingot mold 1 is placed in a heating insulation box, Place riser brick 2 and sprue brick 3 on the upper end of steel ingot mold 1 in sequence, move the tapping trolley, move steel ingot mold 1, riser brick 2 and sprue brick 3 to the lower end of the crucible’s tapping gate, align the ingot mold 1 and riser brick 2 are heated to 670°C, then power off and keep warm, waiting for tapping;

[0080] (2) Heat and smelt the raw materials for smelting GH4065 steel in an induction furnace. After the molten steel is melted, deoxidize and refine the molten steel, then add alloys for alloying, and adjust the temperature of the molten steel until the co...

Embodiment 3

[0085] This embodiment is used to illustrate the ingot pouring process of GH2909.

[0086] The specific operation steps are as follows:

[0087] (1) The steel ingot mold 1, riser brick 2 and sprue brick 3 required for the pouring process are placed in a heating furnace, baked at 400°C for 5.5 hours and then taken out, and then the steel ingot mold 1 is placed in a heating insulation box, Place riser brick 2 and sprue brick 3 on the upper end of steel ingot mold 1 in sequence, move the tapping trolley, move steel ingot mold 1, riser brick 2 and sprue brick 3 to the lower end of the crucible’s tapping gate, align the ingot mold 1 and riser brick 2 are heated to 700°C, then power off and heat preservation, waiting for tapping;

[0088] (2) Heat and smelt the raw materials for smelting GH2909 steel in an induction furnace. After the molten steel is melted, deoxidize and refine the molten steel, then add alloys for alloying, and adjust the temperature of the molten steel until the...

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Abstract

The invention relates to the technical field of ferrous metallurgy, and discloses a method for improving the internal quality of a cast ingot and a heating insulation box. The method comprises the following steps that (1) a baked steel ingot mold, a riser brick and a sprue brick are sequentially placed in the heating insulation box from bottom to top, the steel ingot mold and the riser brick are heated to 600-800 DEG C, then heating is stopped, and heat preservation is conducted; (2) molten steel obtained after smelting is poured into the steel ingot mold; in the pouring process, the pouring speed is controlled in a segmented mode; and after the molten steel is completely poured, the amount of the molten steel in a riser is 10-30 wt% of the weight of the cast ingot; and (3) cooling is conducted after pouring is completed, and demolding is conducted after the molten steel is solidified in the steel ingot mold. According to the method and the heating insulation box, the steel ingot mold and the riser brick are heated to the proper temperature before pouring, then the pouring speed is controlled in the segmented mode, the amount of the molten steel in the riser is controlled, and the problems of internal defects such as shrinkage cavities, looseness and segregation generated by the steel ingot during pouring through an upper pouring method are solved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for improving the internal quality of an ingot and a heating insulation box. Background technique [0002] The internal quality of the ingot is mainly affected by internal defects such as shrinkage cavities, porosity and segregation, which are generated during the pouring and cooling of molten steel. Molten steel pouring is an important part of smelting. As the molten steel is poured into the ingot mold, the molten steel is cooled and solidified sequentially from bottom to top. During the solidification process of molten steel, shrinkage cavities will be generated in the central part due to volume shrinkage. The molten steel flows into the shrinkage cavity for filling and feeding, but if the shrinkage cavity produced by the liquid steel that is finally solidified on the upper part cannot be effectively supplemented by the liquid molten steel, it will fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/00B22D7/10B22D7/12
CPCB22D7/00B22D7/10B22D7/12
Inventor 冯远超李伟陈建平宋伟
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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