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 shrin

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

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Example Embodiment

[0036] Example 1

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

[0038] (2) Ingredients: do ingredients and charge according to the calculated ingredients list.

[0039] (3) Preparation for smelting: 1) The smelting crucible adopts magnesia or aluminum molding crucible;

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

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

[0042] 4) Baking of refractory materials: hopper bricks and shunt bricks are respectively baked at 400°C for 2 hours;

[0043] 5) Use a ring heating furnace to heat the mold in the ingot chamber of the vacuum induction furnace, and the heating temperature of the mold is 600°C.

[0044] (4) Vacuum smelting: in the vacuum Under the condition of <4Pa, the alloy raw materials are smelted in the melting crucible to obtain the alloy liquid. The process...

Example Embodiment

[0047] Example 2

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

[0049] (2) Ingredients: do ingredients and charge according to the calculated ingredients list.

[0050] (3) Preparation for smelting: 1) The smelting crucible adopts magnesia or aluminum molding crucible;

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

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

[0053] 4) Baking of refractory materials: hopper bricks and shunt bricks are respectively baked at 400°C for 2 hours;

[0054] 5) The ring heating furnace is used to heat the mold in the ingot chamber of the vacuum induction furnace, and the heating temperature of the mold is 620℃.

[0055] (4) Vacuum smelting: in the vacuum Under the condition of <4Pa, the alloy raw materials are smelted in the melting crucible to obtain the alloy liquid. The pr...

Example Embodiment

[0058] Example 3

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

[0060] (2) Ingredients: do ingredients and charge according to the calculated ingredients list.

[0061] (3) Preparation for smelting: 1) The smelting crucible adopts magnesia or aluminum molding crucible;

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

[0063] 3) Raw material baking: the above raw materials Ni, Co, Cr, W and Mo are baked and degassed;

[0064] 4) Baking of refractory materials: hopper bricks and shunt bricks are respectively baked at 400°C for 2 hours;

[0065] 5) The ring heating furnace is used to heat the mold in the ingot chamber of the vacuum induction furnace, and the heating temperature of the mold is 650℃.

[0066] (4) Vacuum smelting: in the vacuum Under the condition of <4Pa, the alloy raw materials are smelted in the melting crucible to obtain the alloy liquid. The process of smelting ...

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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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