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Slag system for smelting GH984G nickel base alloys and application method thereof

A GH984G, nickel-based alloy technology, applied in the field of smelting alloys, can solve the problems of poor surface quality of ingots, uneven distribution of easily oxidized elements, etc. The effect of even distribution of elements

Inactive Publication Date: 2018-07-31
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The slag system is suitable for smelting GH984G nickel-based alloy by ingot drawing electroslag remelting. The slag system provided by the present invention can well solve the problem of ingot casting existing in the process of ingot drawing electroslag remelting smelting GH984G nickel-based superalloy. Uneven distribution of easily oxidizable elements at the head and tail and poor surface quality of the ingot

Method used

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  • Slag system for smelting GH984G nickel base alloys and application method thereof
  • Slag system for smelting GH984G nickel base alloys and application method thereof
  • Slag system for smelting GH984G nickel base alloys and application method thereof

Examples

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Embodiment 1

[0044] In this embodiment, as figure 1 The T-shaped crystallizer shown includes consumable electrode 1 , slag pool 2 , ingot 3 , crystallizer 4 , and atmosphere protection device 5 . The relationship between the slag depth coefficient and the crystallizer diameter is as follows: figure 2 shown.

[0045] In this embodiment, the smelting crystallizer has a diameter of 260 mm, and the chemical composition of the nickel-based superalloy slag system for electroslag remelting and smelting of ingots is configured according to the following mass percentages: CaF 2 : 41%, CaO: 30%; Al 2 o 3 : 20%; MgO: 3%; TiO 2 : 5%; SiO 2 :1%. The melting point of the slag system is 1221°C, and at a temperature of 1600°C, the density of the ingot slag system is 2.64g·cm -3 , the resistivity is 0.46Ω·cm.

[0046] Weigh 20kg of the above-mentioned slag material, put it into a muffle furnace and bake at 800°C for 3 hours before smelting the superalloy, and then cool down with the furnace.

[004...

Embodiment 2

[0056] This example is the same as Example 1, except that the chemical composition mass percentage of the nickel-based superalloy slag system used for electroslag remelting and smelting of ingots is: CaF 2 : 42%, CaO: 25%; Al 2 o 3 : 22%; MgO: 3%; TiO 2 : 6%; SiO 2 :2%. The melting point of the slag system is 1263°C, and at a temperature of 1600°C, the density of the ingot-drawing slag system is 2.60 g·cm -3 , the resistivity is 0.51Ω·cm.

[0057] In this embodiment, first weigh 20 kg of prepared slag. Before smelting superalloys, put the configured slag into a muffle furnace and bake at 800°C for 4 hours, then cool down slowly to room temperature with the furnace cooling down.

[0058] A protective atmosphere device is used at the furnace mouth, and argon gas is introduced; in order to facilitate the arc ignition operation, 25g of fluorite powder (calcium fluoride) and 100g of baked pre-melted slag are placed around the arc ignition agent of the T-shaped crystallizer m...

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Abstract

The invention relates to a slag system for smelting GH984G nickel base alloys and an application method thereof. The slag system comprises the following components in percentage by weight: 25-30% of CaO, 20-25% of Al2O3, 2-5% of MgO, 4-7% of TiO2, 1-3% of SiO2 and the balance of CaF2. The slag system is suitable for smelting GH984G high-temperature alloys through remelting of T-shaped crystallizeringot extracting electroslag. The slag system can preferably solve the problems of nonuniform distribution of easy-oxidized elements at the heads and the tails of ingots in the process of smelting the GH984G high-temperature alloys through remelting of the ingot extracting electroslag and weaker surface quality of ingots.

Description

technical field [0001] The invention relates to a slag system for smelting a GH984G nickel-based alloy and a method for using the same, belonging to the technical field of smelting alloys. Background technique [0002] The superheater tubes of thermal power boilers are subjected to high steam temperature and steam pressure during the process of thermal power generation, so very strict requirements are put forward for the materials of superheater tubes. At present, Europe, the United States and Japan have proposed a 700-750 ℃ ​​advanced ultra-supercritical unit (A-USC) research and development plan with higher power generation efficiency. GH984G is one of the candidate materials. [0003] The smelting process for the production of GH984G at this stage is a dual process of vacuum induction melting (VIM) and vacuum autoconsumption melting (VAR). However, the ability of VAR to remove sulfur is poor, and sulfur is a harmful element. It can be enriched at the grain boundary to f...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22C1/02
CPCC22B9/18C22C1/023
Inventor 刘福斌姜周华曹海波董艳伍李花兵曹玉龙潘涛侯志文余嘉
Owner NORTHEASTERN UNIV
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