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Iron chromium aluminum alloy vacuum melting technology

An iron-chromium-aluminum alloy and vacuum smelting technology, applied in the field of metallurgy, can solve the problems of loss of aluminum element oxidation, shrinkage in the center of a large number of cracks in steel ingots, etc., and achieve the effects of improved yield, precise control of alloy composition, and low quantity

Active Publication Date: 2018-10-30
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a vacuum smelting process for iron-chromium-aluminum alloys, through the design of the smelting process, to solve the problems of a large amount of aluminum element loss due to oxidation and a large number of cracks and central shrinkage defects in the steel ingot during the production process of iron-chromium-aluminum alloys , and can precisely control the chemical composition of Fe-Cr-Al alloy

Method used

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Embodiment Construction

[0021] The technical solutions of the present invention will be further described in detail below in conjunction with several preferred embodiments, but are not limited thereto.

[0022] Take the use of a 150kg vacuum induction furnace to produce 6 (single weight about 23kg) alloy ingots with a diameter of 80mm as an example.

[0023] The composition requirements of Fe-Cr-Al alloy are: C≤0.02, Si 0.1, Mn 0.25, Ti 0.5, Cr 20, Al 3.45, Zr0.35, Fe balance (wt.%).

[0024] The raw materials are industrial pure iron, metal chromium, sponge Ti, sponge Zr, Al particles, metal Mn, and polycrystalline Si. The industrial pure iron is derusted, and the sponge Ti, sponge Zr, metal Mn, and polycrystalline Si are baked at 150°C for 2 hours before use, and the Al particles are washed with alkali to remove the surface oxide film.

[0025] (1) Melting period: before charging, according to the chemical composition requirements, the batching is carried out on the basis of 140kg. When charging,...

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Abstract

The invention discloses an iron chromium aluminum alloy vacuum melting technology. The overall technological process mainly comprises a fusion stage, a primary refining stage, a primary alloying stage, a secondary refining stage, a secondary alloying stage and an electrification pouring stage; and a top pouring type mother alloy pouring system is adopted, and a round bar is poured. The iron chromium aluminum vacuum melting technology solves the problems that in the iron chromium aluminum alloy production process, aluminum elements are greatly lost under the oxidation, a large quantity of cracks exist inside a steel ingot, and a central shrinkage hole has defects, and meanwhile, the chemical component of an iron chromium aluminum alloy can be accurately controlled.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a vacuum smelting process of iron-chromium-aluminum alloy. Background technique [0002] Iron-chromium-aluminum alloy has always been regarded as the most important electric heating alloy. The electric heating element produced by iron-chromium-aluminum electric heating alloy has a service temperature between 500-1400 °C, and the iron-chromium-aluminum alloy can form a stable and compact protective and Oxide film with a slow growth rate, it can work normally in a high temperature environment of 1300 °C. Fe-chromium-aluminum alloys have a long history of being used as electrothermal alloys at home and abroad, and are widely used in various fields of industrial production, such as: radiant tubes for heat treatment furnaces, gas conversion systems, nuclear industry equipment, etc. [0003] At present, non-vacuum intermediate frequency induction furnaces are generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/28C21C7/10
CPCC21C7/10C22C33/04C22C38/02C22C38/04C22C38/06C22C38/28
Inventor 胡显军刘建民顾晔姜彩伟
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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