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Cast ingot feeding method

A technology of feeding and ingot casting, which is applied in the field of iron and steel metallurgy, can solve the problems of difficult operation, prolonging the solidification time of molten steel in the riser, and high cost, and achieve the effects of no safety hazard, solving shrinkage cavity defects, and prolonging the solidification time

Active Publication Date: 2021-03-16
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 provide an ingot feeding method in order to overcome the unsatisfactory effect of improving the ingot shrinkage cavity in the prior art, the existence of great potential safety hazards, high cost, and difficult operation. Materials with specific chemical components are used as riser bricks and the riser bricks are heated to a suitable temperature, combined with measures such as controlling the pouring speed and controlling the amount of molten steel in the riser, and pouring the molten steel for feeding into the riser at last, Heat and keep warm through the riser, prolong the solidification time of the molten steel in the riser, and ensure that enough molten steel enters the upper shrinkage cavity of the steel ingot for effective feeding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The embodiment is used to illustrate the pouring process of the superalloy (GH4169 steel) ingot.

[0057] The specific operation steps are as follows:

[0058] (1) Bake the sprue brick and steel ingot mold required for the pouring process at a temperature of 400°C for 4 hours, and bake the heating and heat preservation riser brick at a temperature of 150°C for 3 hours, wherein the heat preservation riser The content of Al in the brick is ≥ 20% by weight, the content of Si ≥ 20% by weight, the content of aluminum silicate is 30% by weight, the content of MgO is 10% by weight, and the content of water is ≤ 1% by weight;

[0059] (2) Heat and smelt the pure iron and scrap steel for smelting GH4169 steel in the crucible of the vacuum induction furnace. After the molten steel is melted, deoxidize and refine the molten steel, and then add alloys for alloying, and adjust the temperature of the molten steel to make the composition of the molten steel uniform. And reach the tap...

Embodiment 2

[0067] The embodiment is used to illustrate the ingot pouring process of GH4065 steel.

[0068] The specific operation steps are as follows:

[0069] (1) Bake the sprue brick and steel ingot mold required for the pouring process at a temperature of 450°C for 3.5 hours, and bake the heating and heat preservation riser brick at a temperature of 120°C for 4 hours, wherein the heat preservation riser The content of Al in the brick is ≥ 20% by weight, the content of Si ≥ 20% by weight, the content of aluminum silicate is 20% by weight, the content of MgO is 20% by weight, and the content of water is ≤ 1% by weight;

[0070] (2) Heat and smelt pure iron and scrap steel for smelting GH4065 steel in a vacuum induction furnace crucible. After the melt is cleared, deoxidize and refine the molten steel, then add alloys for alloying, adjust the temperature of the molten steel, and make the composition of the molten steel uniform And reach the tapping temperature;

[0071] (3) Take out t...

Embodiment 3

[0077] The embodiment is used to illustrate the ingot pouring process of GH2909 steel.

[0078] The specific operation steps are as follows:

[0079] (1) Bake the sprue brick and steel ingot mold required for the pouring process at a temperature of 350°C for 5 hours, and bake the heating and heat preservation riser brick at a temperature of 180°C for 2 hours, wherein the heat preservation riser The content of Al in the brick is ≥ 20% by weight, the content of Si ≥ 20% by weight, the content of aluminum silicate is 40% by weight, the content of MgO is 15% by weight, and the content of water is ≤ 1% by weight;

[0080] (2) Heat and smelt the pure iron and scrap steel for smelting GH2909 steel in the crucible of the vacuum induction furnace. After the molten steel is melted, deoxidize and refine the molten steel, and then add alloys for alloying, adjust the temperature of the molten steel, and make the composition of the molten steel uniform And reach the tapping temperature;

...

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PUM

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Abstract

The invention relates to the technical field of ferrous metallurgy, and discloses a cast ingot feeding method. The method comprises the following steps: (1) baking an ingot mold and a king brick at 300-500 DEG C for 3-6 hours, and baking an exothermic insulating feeder brick at 100-300 DEG C for 2-4 hours; (2) placing the exothermic insulating feeder brick at the upper end of the ingot mold, thenplacing the king brick at the upper end of the exothermic insulating feeder brick, and waiting for steel tapping; (3) controlling the pouring speed segmentally, and after all molten steel is poured, making the weight of the molten steel in an exothermic insulating feeder 10-30 weight percent of that of each ingot; and (4) conducting cooling after pouring is completed, and conducting demolding after the molten steel solidifies in the ingot mold. According to the method, by adopting a material with specific chemical components as the feeder brick and heating the feeder brick to a proper temperature in combination with measures of controlling the pouring speed, controlling the weight of the molten steel in the feeder, and the like, the solidification time of the molten steel in the feeder isprolonged, and it is ensured that enough molten steel enters shrinkage cavities of the upper portions of the ingots, so that effective feeding is conducted.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an ingot feeding method. Background technique [0002] Pouring is an important part of iron and steel smelting. As 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 occur in the center due to volume shrinkage. The liquid 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 liquid steel, it will form the shrinkage cavity defect of the ingot and always exist, accompanied by looseness and segregation The generation of internal defects will have adverse effects on the subsequent smelting and processing. This problem is especially obvious on special steel with high alloy content. Shri...

Claims

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Application Information

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IPC IPC(8): B22D7/00B22D7/10B22D7/12
CPCB22D7/00B22D7/10B22D7/12
Inventor 冯远超李伟陈建平谢涛
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP