Novel high-resistance electrothermal alloy Cr20Ni80Al and preparation method thereof

Abstract

The invention provides a novel high-resistance electrothermal alloy Cr20Ni80Al, and further provides a preparation process of the novel high-resistance electrothermal alloy Cr20Ni80Al. The constituentelements of the novel high-resistance electrothermal alloy Cr20Ni80Al include, by weight percentage, C<=0.03%, Si:1.40-1.60, Mn<=0.50%, P<=0.020%, S<=0.015%, Cr:20.5-21.50%, Ti<=0.10%, Al:3.0-3.7%, Fe<=1.00%, Zr<=0.2%, and the balance of Ni and unavoidable impurities. Compared with prior electrothermal alloys, the novel high-resistance electrothermal alloy Cr20Ni80Al has the excellent performances of being higher in resistivity, longer in service life, very good in processing performance, excellent in oxidation resistance, small in thermal expansion coefficient, good in high temperature strength, etc., and is of great economic significance to improving production efficiency, ensuring product quality and reducing production costs.

Description

technical field [0001] The invention relates to the technical field of electrothermal alloys, in particular to a novel high-resistance electrothermal alloy Cr20Ni80Al for electric heating elements and a preparation method thereof. Background technique [0002] Electrothermal alloy is a functional material that converts electrical energy into thermal energy. Its maximum operating temperature can reach 1400 °C. At present, electrothermal alloy material has become an important engineering alloy material and occupies an important position in the national economy. Countries with a large output of foreign electrothermal alloys include Sweden, Russia, Germany, the United States, and Japan. In some countries, the proportion of nickel-chromium alloys in electrothermal alloys accounts for 50%-90% due to rich nickel resources. [0003] In the early 1950s, my country began to produce nickel-chromium-iron electrothermal alloy products. In the past, the induction furnace smelting proces...

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Problems solved by technology

[0004] Electrothermal alloys are mainly divided into two categories: nickel-chromium electrothermal alloys and iron-chromium-aluminum electrothermal alloys. These two types of electrothermal alloys have different advantages and disadvantages due to their different structures: nickel-chromium electrothermal alloys are single-phase austenitic structures. Its advantage is that there is no phase change at high temperature and high stability; it has relatively excellent high temperature strength and plasticity; good formability, good oxidation resistance, high durable strength and high temperature service life; the disadvantage is that the resistivity is not as good as that of Fe-Cr-Al Electric heating alloy; iron-chromium-aluminum series electric heating alloy is a single-phase ferrite structure. Its advantages are that it can be used in ultra-high temperature (above 1100°C) environments, has higher resistivity, and good oxidation resistance. The disadvantage is poor plasticity, Not easy to form, not weldable, durable strength and service life are not as good as nickel-chromium alloys

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