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Method for removing shrinkage cavity and loosening of master alloy bar in vacuum smelting

A vacuum smelting and master alloy technology, applied in the field of smelting, can solve the problems of shrinkage cavity depth, reduce shrinkage cavity depth, and can not get the surrounding metal liquid replenishment, etc., to achieve the effect of dense internal structure and increased fluidity

Inactive Publication Date: 2019-02-15
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The primary shrinkage cavity is usually used to insulate the solidified molten steel at the head by using the heat preservation riser to reduce the depth of the shrinkage cavity. In the middle part, the hole formed by the shrinkage of the final solidified part cannot be supplemented by the surrounding molten metal, and a closed shrinkage cavity is formed inside the master alloy ingot, which is a secondary shrinkage cavity
Conventional pouring methods cannot eliminate secondary shrinkage cavities
After the vacuum melting master alloy is poured, there are often two problems in the ingot: one is that the primary shrinkage cavity is located at the uppermost end of the master alloy ingot and the shrinkage cavity is deep, and sometimes the depth of the shrinkage cavity even reaches 1 / 3 of the height of the master alloy~ 1 / 2
Second, the secondary shrinkage cavity exists inside the alloy ingot, which is distributed continuously or discontinuously and cannot be removed

Method used

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  • Method for removing shrinkage cavity and loosening of master alloy bar in vacuum smelting
  • Method for removing shrinkage cavity and loosening of master alloy bar in vacuum smelting
  • Method for removing shrinkage cavity and loosening of master alloy bar in vacuum smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Name of smelting alloy: K418.

[0038] (2) Ingredients: Dosing and loading according to the calculated ingredient list.

[0039] (3) Preparatory work for smelting: 1) The smelting crucible is made of magnesium or aluminum forming crucible;

[0040] 2) The crucible is baked and furnace-washed, and the furnace-washing process uses pure nickel or the returned material of the same steel type to wash the furnace;

[0041] 3) Baking of raw materials: Toasting and degassing the above-mentioned raw materials of Ni, Co, Cr, W and Mo respectively;

[0042] 4) Baking of refractory materials: the funnel brick and the splitter brick are respectively baked at 400°C for 2 hours;

[0043] 5) In the ingot casting room of the vacuum induction furnace, the casting mold is heated by a ring heating furnace, and the heating temperature of the casting mold is 600°C.

[0044] (4) Vacuum smelting: Melting alloy raw materials in a melting crucible under the condition of vacuum degree <4Pa...

Embodiment 2

[0048] (1) Name of smelting alloy: K418.

[0049] (2) Ingredients: Dosing and loading according to the calculated ingredient list.

[0050] (3) Preparatory work for smelting: 1) The smelting crucible is made of magnesium or aluminum forming crucible;

[0051] 2) The crucible is baked and furnace-washed, and the furnace-washing process uses pure nickel or the returned material of the same steel type to wash the furnace;

[0052] 3) Baking of raw materials: Toasting and degassing the above-mentioned raw materials of Ni, Co, Cr, W and Mo respectively;

[0053] 4) Baking of refractory materials: the funnel brick and the splitter brick are respectively baked at 400°C for 2 hours;

[0054] 5) In the ingot casting room of the vacuum induction furnace, the casting mold is heated by a ring heating furnace, and the heating temperature of the casting mold is 620°C.

[0055] (4) Vacuum smelting: Melting alloy raw materials in a melting crucible under the condition of vacuum degree <4Pa...

Embodiment 3

[0059] (1) Name of smelting alloy: K418.

[0060] (2) Ingredients: Dosing and loading according to the calculated ingredient list.

[0061] (3) Preparatory work for smelting: 1) The smelting crucible is made of magnesium or aluminum forming crucible;

[0062] 2) The crucible is baked and furnace-washed, and the furnace-washing process uses pure nickel or the returned material of the same steel type to wash the furnace;

[0063] 3) Baking of raw materials: Toasting and degassing the above-mentioned raw materials of Ni, Co, Cr, W and Mo respectively;

[0064] 4) Baking of refractory materials: the funnel brick and the splitter brick are respectively baked at 400°C for 2 hours;

[0065] 5) In the ingot casting chamber of the vacuum induction furnace, the casting mold is heated by a ring heating furnace, and the heating temperature of the casting mold is 650°C.

[0066] (4) Vacuum smelting: Melting alloy raw materials in a melting crucible under the condition of vacuum degree <...

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Abstract

The invention belongs to the technical field of smelting, and specifically relates to a method for removing a shrinkage cavity and loosening of a master alloy bar in vacuum smelting. The method is characterized in that a steel ingot mold is heated, so that the temperature difference between the steel ingot mold and hot metal can be reduced; the cooling and solidifying speed of the hot metal can bedecreased; the flowability of a metal melt is improved; the heat in a casting ingot can be timely transferred to the surface, and the inside can be quickly solidified, so that the shrinkage cavitiesin the middle part and the center part of a master alloy can be decreased, and all parts of a master alloy casting ingot can be sequentially solidified from bottom to top while being uniformly solidified to the maximum; the shrunk early-solidified parts at the lower parts can be supplemented through upper hot metal, so that the upper shrinkage cavities and loosening can be reduced. The method is mainly suitable for a high-temperature alloy and a master alloy and can also be popularized to other alloys subjected to vacuum induction smelting.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a method for eliminating shrinkage cavity and porosity of a master alloy bar material for vacuum smelting. Background technique [0002] During the pouring and solidification process of the master alloy, when the molten metal is poured into the ingot mold, since the temperature of the ingot mold for pouring the master alloy is significantly lower than the temperature of the molten metal, the temperature of the molten metal is quickly transferred to the ingot mold, which is close to the inner surface of the ingot mold of the master alloy. The molten metal solidifies rapidly, and the ingot solidifies from the outside to the inside. During the solidification process, the volume of the alloy shrinks, and shrinkage cavities and porosity often appear in the final solidified part (center) of the master alloy. [0003] When the master alloy is solidified, there is no contin...

Claims

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Application Information

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IPC IPC(8): B22D7/00
CPCB22D7/00
Inventor 常跃威王子杨艳刘锋陈福平张东其他发明人请求不公开姓名
Owner JINCHUAN GROUP LIMITED
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