A method for electroslag remelting to prepare hollow steel ingots of nickel-based superalloys

A technology of nickel-based superalloy and electroslag remelting, which is applied in the field of metallurgy, can solve the problems of the proportion difference, inclusion and shrinkage cavity of alloy elements that cannot be prepared, so as to suppress the occurrence of macro segregation, reduce the degree of segregation and improve the yield of metal Effect

Active Publication Date: 2019-03-22
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hollow steel ingots prepared by centrifugal casting have defects such as pores, inclusions, and shrinkage cavities, and cannot prepare material ingots with large differences in specific gravity of alloying elements.
Therefore, this method has a large limitation

Method used

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  • A method for electroslag remelting to prepare hollow steel ingots of nickel-based superalloys
  • A method for electroslag remelting to prepare hollow steel ingots of nickel-based superalloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Using the electroslag remelting nickel-based superalloy hollow steel ingot equipment with a single power supply and double-circuit conductive mold as mentioned above, the following method is used to prepare the Inconel740H nickel-based superalloy hollow steel ingot. The specific steps are as follows:

[0027](1) First, prepare a plurality of Inconel740H nickel-based superalloy consumable electrode groups. The amount of each consumable electrode is 370kg. The row electrode group is left and right symmetrical;

[0028] (2) Preparation of pre-melted slag material, according to CaF 2 : 41%, Al 2 o 3 : 20%, CaO: 30%, MgO: 2.0%, TiO 2 : 5.0%, SiO 2 : 2.0% mixed and stirred evenly, melted in an electric arc furnace, refined at 1560-1580°C for 40 minutes, then cast in a cast iron pan to cool, and crushed and sieved by a crusher to get 1-10mm parts, After being bagged, it can be used in an electroslag furnace;

[0029] (3) Put the pre-melted slag into an electric resistanc...

Embodiment 2

[0037] Using the electroslag remelting nickel-based superalloy hollow steel ingot equipment with a single power supply and double-circuit conductive mold as described above, the following method is used to prepare the Inconel617B nickel-based superalloy hollow steel ingot. The specific steps are as follows:

[0038] (1) First, prepare a plurality of Inconel617B nickel-based high-temperature composite consumable electrode groups. Each electrode group consists of two parts: the right consumable electrode group 8 and the left consumable electrode group 9, so that it can be fixed by internal crystallization. the beam of the device;

[0039] (2) Pre-melted slag material, according to CaF 2 : 41%, Al 2 o 3 : 20%, CaO: 30%, MgO: 2.0%, TiO 2 : 5.0%, SiO 2 : 2.0% mixed and stirred evenly, melted in an electric arc furnace, and refined at 1550-1580°C for 50 minutes, then cast in a cast iron pan to cool, and crushed and screened by a crusher to get 1-10mm parts, After being bagged, ...

Embodiment 3

[0048] Using the electroslag remelting nickel-based superalloy hollow steel ingot equipment with a single power supply and double-circuit conductive mold as mentioned above, the following method is used to prepare a GH984G nickel-based superalloy hollow steel ingot. The specific steps are as follows:

[0049] (1) First, prepare a plurality of GH984G nickel-based superalloy consumable electrode groups, each electrode group consists of two symmetrical parts, so that it can pass through the beam that fixes the inner mold;

[0050] (2) Pre-melted slag material, according to CaF 2 : 41%, Al 2 o 3 : 20%, CaO: 30%, MgO: 2.0%, TiO 2 : 5.0%, SiO 2 : 2.0% mixed and stirred evenly, melted in an electric arc furnace, refined at 1550-1580°C for 45 minutes, then cast in a cast iron pan to cool, and crushed and screened by a crusher to get 1-10mm parts, After being bagged, it can be used in an electroslag furnace;

[0051] (3) Put the pre-melted slag into an electric resistance furnace ...

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Abstract

The invention discloses equipment and a method for preparing nickel-based high-temperature alloy hollow steel ingots through electro-slag remelting and belongs to the technical field of metallurgy. The equipment and the method are characterized in that the equipment adopts a single power supply and double loops for power supply and adopts a T-shaped conductive crystallizer and an inner crystallizer; the preparing method comprises the steps as follows: consumable electrode groups are prepared, a slag system containing proper components is prepared, is roasted and melted and then is poured into a cavity formed by the T-shaped conductive crystallizer and the inner crystallizer, meanwhile, the power supply of a conductive loop II is turned on firstly, then the power supply of a conductive loop I is turned on, and the consumable electrode groups are inserted in the slag for smelting and ingot drawing and are changed timely when relatively few consumable electrode groups are left until smelting ends. With the method, the nickel-based high-temperature alloy hollow steel ingots with the uniform components and good inner and outer surface quality can be manufactured.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing a hollow steel ingot of a nickel-based high-temperature alloy by electroslag remelting with a single power source and double circuits. Background technique [0002] With the development of my country's petrochemical, aero-engine and 700°C advanced ultra-supercritical high-pressure boiler industries, the requirements for high-temperature strength, creep fracture resistance and corrosion resistance of various alloy pipes are getting higher and higher. Traditional materials such as austenitic heat-resistant steel can no longer meet the actual production needs, while nickel-based superalloys are ideal materials for making the above-mentioned alloy pipes. Nickel-based superalloys refer to superalloys with nickel content generally greater than 50%, high strength and good high temperature resistance, oxidation resistance and corrosion resistance in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18B22D7/04
CPCB22D7/04C22B9/18
Inventor 刘福斌姜周华余嘉陈奎李星彭辉钱瑞清
Owner NORTHEASTERN UNIV LIAONING
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