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A method for reducing non-metallic inclusions in iron-chromium-aluminum series electrothermal alloys

A technology of non-metallic inclusions and electrothermal alloys, applied in the direction of improving process efficiency, etc., can solve the problems of irregular shape, strong brittleness, large inclusion size, etc., and achieve the effect of regular shape and reduced size

Active Publication Date: 2017-01-25
YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, non-metallic inclusions are one of the main factors affecting the service life of iron-chromium-aluminum alloy wires. The inclusions are large in size, irregular in shape, and strong in brittleness. They severely split the matrix and affect the service life of the product.

Method used

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Embodiment Construction

[0013] Further illustrate and understand the present invention through embodiment below.

[0014] The preparation method includes: a method for reducing non-metallic inclusions in iron-chromium-aluminum series electric heating alloys, characterized in that the method includes the following steps: (1) batching: batching according to the following composition: C: 0.013%, Si : 0.35%, Ni: 1%, Al: 4.4%, Cr: 17.9%, Co: 4.6%, Mo: 2.5%, Zr: 4.3%, Nb: 2.2%, Ti: 0.6%, Ce: 0.2%, La : 0.3%, B: 0.007%, S ≤ 0.0001%, P ≤ 0.0001%, the balance is iron and unavoidable impurities; (2) Melting: vacuumize to 1×10 -4 pa, melt the above-mentioned raw materials under high vacuum conditions, carry out oxygen blowing decarburization after melting, stop blowing oxygen after the carbon content is lower than 0.02%, and then carry out high vacuum boiling, the boiling time is more than 25min; (3) slagging: adding 1wt% ferrosilicon, 2.3wt% lime and 0.8wt% fluorite are used to make slagging in the total meta...

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Abstract

The invention relates to a method for reducing non-metallic inclusions in an iron-chromium-aluminum electrothermal alloy. The preparation method comprises the following steps: proportioning, smelting, slagging, deoxidating, blowing argon, carrying out hot rolling to obtain a coil, carrying out stress-relief annealing, rinsing, and carrying out multi-pass drawing. The method can effectively lower the total content of non-metallic inclusions, reduce the inclusion size, improve the shapes of the inclusions and lower the influence of the inclusions on the service life of the iron-chromium-aluminum electrothermal alloy. By optimizing the element composition and proportioning, the method effectively enhances the toughness, tensile strength and oxidation resistance of the alloy wire.

Description

[0001] Technical field: [0002] The invention relates to an electrothermal alloy, in particular to a method for reducing non-metallic inclusions in an iron-chromium-aluminum series electrothermal alloy. [0003] Background technique: [0004] Electrothermal alloy materials are resistance alloys that use the resistance properties of substances to manufacture heating elements. At present, the electrothermal alloy material has become an important engineering alloy material, which is suitable for machinery, metallurgy, electronics, chemical industry and other industries, and occupies an important position in the national economy. According to the chemical composition, electrothermal alloys can be divided into three series: nickel-chromium alloy, nickel-chromium-iron alloy and iron-chromium-aluminum alloy. The iron-chromium-aluminum alloy has a wide range of applications, and has the advantages of high service temperature, high resistivity, and easy hot and cold processing. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C21C7/072C21C7/076C21C7/06
CPCY02P10/20
Inventor 郭健郭小芳郭乃林
Owner YANCHENG XINYANG ELECTROTHERMAL MATERIAL CO LTD