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Nickel-chromium high resistance electric heating alloy

An electrothermal alloy and high resistance technology, applied in the metallurgical field, can solve the problems of high performance cost, poor physical properties of Cr20Ni80 resistance electrothermal alloy, etc., and achieve the effects of low production cost, good surface oxidation resistance and corrosion resistance, and high strength.

Active Publication Date: 2021-12-14
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the physical properties of the existing Cr20Ni80 resistance electrothermal alloy are relatively poor, and the problem of high cost of improving the physical properties of the Cr20Ni80 resistance electrothermal alloy in the prior art

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the chemical composition of nickel-chromium high-resistance electric heating alloy, the ingredients are prepared, and then the product is obtained through the process of smelting, electroslag remelting, forging, hot-rolled wire rod, annealing and pickling: nickel-chromium high-resistance electric heating alloy, its chemical composition is determined by mass The percentages are: C 0.026%, Si 1.40%, Mn 0.09%, P 0.005%, S 0.002%, Al 0.46%, Fe 0.65%, Cr21.15%, Ti 0.27%, Co 0.23%, Zr 0.10%, balance It is Ni and unavoidable impurities.

[0029] After testing, the maximum operating temperature of the element is 1200°C, the melting point is 1400°C, and the density is 8.17g / cm 3 , Resistivity (23°C): 1.15uΩ.m, elongation ≥ 25%, linear expansion coefficient a×10 -6 / °C (20-1000°C): 17.25, the microstructure is austenitic and non-magnetic.

Embodiment 2

[0031]According to the chemical composition of nickel-chromium high-resistance electric heating alloy, the finished product is obtained through the process of smelting, electroslag remelting, forging, hot-rolled wire rod, annealing and pickling: nickel-chromium high-resistance electric heating alloy, its chemical composition is according to the quality The percentages are: C 0.024%, Si 1.29%, Mn 0.10%, P 0.007%, S 0.002%, Al 0.45%, Fe 0.32%, Cr20.70%, Ti 0.11%, Co 0.43%, Zr 0.17%, balance It is Ni and unavoidable impurities.

[0032] The maximum service temperature of the tested component is 1200°C, the melting point is 1400°C, and the density is 8.18g / cm 3 , Resistivity (23°C): 1.13uΩ.m, elongation ≥ 25%, linear expansion coefficient a×10 -6 / °C (20-1000°C): 17.43, the microstructure is austenitic and non-magnetic.

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Abstract

The invention discloses a nickel-chromium high-resistance electrothermal alloy, which belongs to the field of metallurgy. The chemical composition of the nickel-chromium high-resistance electric heating alloy is: C≤0.08%, Si0.75-1.60%, Al≤0.50%, Cr20.0-23.0%, Mn0.05-0.10%, Fe≤ 1.0%, P≤0.020%, S≤0.015%, Ti0.10-0.30%, Co0.20-0.45%, Zr0.05-0.18%, the balance is Ni and unavoidable impurities; the nickel-chromium high-resistance electric heater of the present invention Alloy, its coefficient of linear expansion a×10 ‑6 / °C (20‑1000°C): 17.25‑17.43, resistivity 1.12‑1.15uΩ.m, elongation ≥ 25%, which can effectively solve the poor physical properties of the existing Cr20Ni80 resistance electrothermal alloy, and improve the Cr20Ni80 resistance electrothermal alloy with existing technology Problems with higher physical performance costs.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to an alloy material, in particular to a novel nickel-chromium high-resistance electrothermal alloy. Background technique [0002] High-resistance electrothermal alloy is a functional electrothermal engineering alloy material that uses the resistance of the material to generate Joule heat to convert electrical energy into heat energy. According to the chemical composition, it is mainly divided into Ni-Cr system, Ni-Cr-Fe system and Fe-Cr-Al There are three types of alloys, widely used in electric heating elements in metallurgy, machinery, petrochemical, electrical, construction, home appliances and other fields. Among them, the Cr20Ni80 electric heating alloy with austenitic structure has uniform and stable resistivity, high melting point, high service temperature, small thermal expansion coefficient, and good oxidation resistance under high temperature conditions. With many advantages such ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05H05B3/12
CPCC22C19/058H05B3/12
Inventor 武雪婷张军尹凤先张兴勇
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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