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Smelting method for controlling aluminum and titanium burning losses of iron and nickel-based high-temperature alloy electroslag ingot

A high-temperature alloy and smelting method technology, applied in the field of high-temperature alloys, can solve problems such as fluctuations in the mechanical properties of steel ingots, affecting the consistency and stability of alloy performance, affecting the pass rate, etc., and achieve the effect of solving the problem of burning loss

Active Publication Date: 2020-11-20
BEIJING CISRI GAONA TECH +1
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Problems solved by technology

However, iron-nickel-based superalloys with high titanium and low aluminum will burn to a certain extent during the electroslag remelting process, which will affect the performance consistency and stability of the alloy.
This is because Al and Ti elements are active and easily oxidizable elements, and the main component of the slag is reducing oxides. During the remelting process, Al and Ti elements will undergo reduction reactions with the oxides in the slag, causing the steel ingot to There is a gradient change in the content of Al and Ti elements in the longitudinal direction, which has caused serious consequences such as fluctuations in the mechanical properties of the steel ingot and poor quality stability.
These technical defects will cause the produced steel ingots to fail to meet the requirements of technical indicators and affect the pass rate; it will also cause the stability of the batch quality of steel ingots and affect the reliability of service

Method used

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  • Smelting method for controlling aluminum and titanium burning losses of iron and nickel-based high-temperature alloy electroslag ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1. A method for smelting high-titanium-low-aluminum iron-nickel-based superalloy electroslag ingots to control burning loss of aluminum and titanium

[0041] This example mainly introduces a high-titanium-low-aluminum iron-nickel-based superalloy electroslag ingot smelting method to control the burning loss of aluminum and titanium. The specific smelting method and parameters include:

[0042] (1) The composition and weight percent of the high-titanium and low-aluminum iron-nickel-based superalloy are: Fe matrix, Ni 41.5, Cr16.0, Al 0.3, Ti 1.8, Nb 3.0, C 0.02; The composition and weight percentage of nickel-based superalloys are casted into vacuum induction ingots by using a vacuum induction melting furnace to smelt and refine metal raw materials or returned materials (for specific technical parameters, refer to patent 201910803960.4). Electroslag remelted electrode SA1 (ie, smelting electrode) was prepared after cleaning.

[0043] (2) Electroslag ingot diamet...

Embodiment 2

[0054] Example 2. A method for smelting iron-nickel-based superalloy electroslag ingots to control burning loss of aluminum and titanium

[0055] This example mainly introduces a high-titanium-low-aluminum iron-nickel-based superalloy electroslag ingot smelting method to control the burning loss of aluminum and titanium. The specific smelting method and parameters include:

[0056] (1) The composition and weight percent of the high-titanium-low-aluminum iron-nickel-based superalloy are: Fe matrix, Ni 53.0, Cr18.0, Al 0.5, Ti 0.9, Nb 5.0, Mo 3.0, C0.02; The composition and weight percentage of nickel-based superalloys with titanium and low aluminum are cast into vacuum induction ingots after smelting and refining the metal raw materials or returned materials in a vacuum induction melting furnace (for specific technical parameters, refer to patent 201910803960.4), and then through Electroslag remelting electrode SA2 (ie, smelting electrode) was prepared after the surface of the ...

Embodiment 3

[0068] Example 3. A method for smelting iron-nickel-based superalloy electroslag ingots to control burning loss of aluminum and titanium

[0069] This example mainly introduces a high-titanium-low-aluminum iron-nickel-based superalloy electroslag ingot smelting method to control the burning loss of aluminum and titanium. The specific smelting method and parameters include:

[0070] (1) The composition and weight percent of the high-titanium-low-aluminum iron-nickel-based superalloy are: Fe matrix, Ni 53.0, Cr18.0, Al 0.5, Ti 0.9, Nb 5.0, Mo 3.0, C 0.01; The composition and weight percentage of low-aluminum nickel-based superalloys are casted into vacuum induction ingots by using a vacuum induction melting furnace to smelt and refine metal raw materials or returned materials (for specific technical parameters, refer to patent 201910803960.4). Electroslag remelting electrode SA3 (ie, smelting electrode) is prepared after the surface of the induction ingot is machined clean.

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Abstract

The invention provides a smelting method for controlling aluminum and titanium burning losses of an iron and nickel-based high-temperature alloy electroslag ingot. By adopting a quaternary slag systemwhich comprises 55-65% of CaF2, 15-20% of Al2O3, 15-20% of CaO and 2-6% of TiO2 and optimizing electrical systems in an electroslag remelting starting stage, a smelting stage and a filling stage, thesmelting method is suitable for smelting the iron and nickel-based high-temperature alloy electroslag ingot, wherein the ingot comprises 41.5-53.0 parts of Ni, 16.0-18.0 parts of Cr, 0.3-0.5 part ofAl, 0.9-1.8 parts of Ti, 3.0-5.0 parts of Nb, 0.01-0.04 part of C and the balance Fe, and the diameter is 810-1100 mm. The smelting method for controlling aluminum and titanium burning losses of the iron and nickel-based high-temperature alloy electroslag ingot can solve the problem of burning losses of aluminum and titanium in a remelting process of a large dimension iron and nickel-based high-temperature alloy electroslag ingot, the diameter of which is 810-1100 mm, effectively.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloys, and in particular relates to a smelting method for controlling the burning loss of aluminum and titanium by electroslag ingots of iron-nickel-based high-temperature alloys. Background technique [0002] Iron-nickel-based superalloys are a class of superalloys prepared by taking Fe and Ni elements as the matrix and adding Co, Cr, Mo, Al, Ti, Nb, B, C and other elements to the alloy. [0003] For iron-nickel-based superalloys, Al, Ti and Nb elements are important alloying elements in iron-nickel-based superalloys. Al and Ti elements can form a chemical composition with Ni elements as Ni 3 (Al, Ti) strengthening phase γ′ phase, Nb can form a chemical composition with Ni as Ni 3 The strengthening phase of Nb is the γ″ phase. The precipitation-strengthened iron-nickel-based superalloy mainly relies on the γ′ phase and the γ″ phase to strengthen, and this strengthening effect is direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C1/03C22C1/06C22C19/05C22C30/00
CPCC22B9/18C22C1/03C22C1/06C22C30/00C22C19/056C22C1/023
Inventor 黄烁赵光普张北江李连鹏丑英玉秦鹤勇张文云段然王冲
Owner BEIJING CISRI GAONA TECH
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