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Method for producing tough iron-chromium-aluminium ferritic electrothermal alloy

A technology of aluminum ferrite and electrothermal alloy, which is applied in the field of iron-chromium-aluminum ferrite electrothermal alloy, can solve the problems of coarse grains and reduction in the number of grain boundaries.

Active Publication Date: 2009-09-23
JIANGSU XIHU SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing iron-chromium-aluminum electric furnace wire has a relatively high carbon content. After using at high temperature, during the cooling process with the furnace, M 23 C 6 The precipitation is inevitable, especially when the furnace wire is used at high temperature for a long time, the grains grow very thick, the number of grain boundaries is relatively reduced, and the entire grain boundary is covered with network M 23 C 6 , the degree of brittleness is more severe

Method used

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  • Method for producing tough iron-chromium-aluminium ferritic electrothermal alloy

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Effect test

Embodiment 1

[0058] The production method of ductile iron-chromium-aluminum ferritic electric heating alloy is characterized in that:

[0059] 1) Selection of raw materials:

[0060] The pure Fe and metal Cr used, the mass percentage of carbon in pure Fe is controlled below 0.02, and the oxide scale on the surface of pure iron is not treated in any way;

[0061] 2) Process:

[0062] a. Vacuum smelting: smelting pure Fe, metal Cr, Al, Mo under vacuum, without protective atmosphere, the vacuum degree during the melting period is controlled at 30Pa, the chemical composition of the ductile iron-chromium-molybdenum ferrite alloy The mass percentage is: C0.005, N0.025, Si0.1, Mn0.08, Cr31, Al6.0, P0.030, S0.030, Mo0-0.22, and the balance is Fe and unavoidable impurities;

[0063] b. High-temperature vacuum refining: high-temperature, high-vacuum refining system is adopted. The molten steel is refined at 1620-1670°C and 3Pa vacuum for 15-20 minutes. When the vacuum reaches 23000Pa, oxygen blowi...

Embodiment 2

[0070] The production method of ductile iron-chromium-aluminum ferritic electric heating alloy is characterized in that:

[0071] 1) Selection of raw materials:

[0072] The pure Fe and metal Cr used, the mass percentage of carbon in pure Fe is controlled below 0.02, and the oxide scale on the surface of pure iron is not treated in any way;

[0073] 2) Process:

[0074] a. Vacuum smelting: smelting pure Fe, metal Cr, Al, Nb under vacuum, without protective atmosphere, the vacuum degree during the melting period is controlled at 35Pa, the chemical composition of the tough iron-chromium-molybdenum ferrite alloy The mass percentage is: C0.001, N0.005, Si0.1, Mn0.08, Cr31, Al6.0, P0.030, S0.030, Nb0-0.22, and the balance is Fe and unavoidable impurities;

[0075] b. High-temperature vacuum refining: high-temperature, high-vacuum refining system is adopted. The molten steel is refined at 1620-1670°C and a vacuum of 1-5Pa for 15-20 minutes. When the vacuum reaches 25000Pa, oxygen ...

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Abstract

The invention discloses a method for producing tough iron-chromium-aluminium ferritic electrothermal alloy, which comprises the following steps: 1) raw material selection; 2) technological processes: a, vacuum melting; b, high-temperature vacuum refining; c, reductive slagging; d, temperature reduction and solidification; e, temperature rise and deoxidation; f, quenching and tempering and homogenization; and g, casting ingots. The product produced by the method has excellent corrosion resistance as well as good toughness, and is as applied to the material of a heating wire; and the heating wire has lower cost, the used temperature 300 DEG C higher, and longer service life than a nickel-chromium heating wire.

Description

technical field [0001] The invention relates to metal functional materials, in particular to an iron-chromium-aluminum ferrite electric heating alloy with excellent toughness. Background technique [0002] In recent years, the price of rare metal nickel has soared, which has doubled the price of austenitic stainless steel. The application of nickel-based austenitic stainless steel has been seriously affected, while the use of ferritic and horse-based stainless steel has been further expanded. High chromium (25-31%) Ferritic stainless steel not only has excellent corrosion resistance, but also has excellent stress corrosion resistance, crevice corrosion resistance, and pitting corrosion resistance. It can replace expensive nickel-based and titanium and other advanced corrosion-resistant alloy materials. Although high-chromium ferritic stainless steel has excellent corrosion resistance, its severe brittleness prevents it from being widely used. Aluminum-containing high-chromi...

Claims

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Application Information

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IPC IPC(8): C22C33/04
Inventor 翟世先徐华翟海平翟华平翟玉亭
Owner JIANGSU XIHU SPECIAL STEEL
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