High-resistance electrothermal alloy material and preparation method thereof

Abstract

The invention discloses a high-resistance electrothermal alloy material, which comprises the following components in percentage by weight: 0.02 to 0.08 percent of C, 0.75 to 1.6 percent of Si, 0.1 to 0.5 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, 20 to 23 percent of Cr, 0.1 to 0.5 percent of Al, 0.2 to 0.8 percent of Y, 0.2 to 1.0 percent of Fe, and the balance of Ni and inevitable impurities. The preparation method for the high-resistance electrothermal alloy material comprises the following steps of: smelting; forging; coiling; annealing; rinsing; mold drawing, and the like. Compared with Cr20Ni80, the high-resistance electrothermal alloy material has higher antioxidation performance, and is an electrothermal alloy material with small thermal expansion coefficient, high high-temperature strength and processability, long service life and high resistivity.

Description

technical field [0001] The invention relates to a high-resistivity electrothermal alloy material in the technical field of metal materials, in particular to a [0002] High-resistance electrothermal alloy material and its preparation method. It specifically relates to a Cr20Ni80Y material, which is mainly used as an electrothermal alloy material for household appliances, industrial electric furnaces and heating elements. Background technique [0003] Electrothermal alloy is a functional material that converts electrical energy into heat energy. Its maximum service temperature can reach 1400 ° C. It is used to manufacture various electric heating elements in the fields of metallurgy, machinery, petrochemical, electrical, construction, military industry, and household appliances. At present, electrothermal alloy materials have become an important engineering alloy material and occupy an important position in the national economy. With the development of the household applian...

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Problems solved by technology

Although the widely used nickel-chromium alloy Cr20Ni80 has the advantages of high melting point, small thermal expansion coefficient and good oxidation resistance, it still has the disadvantages of poor high-temperature strength and short service life. 0 C, its anti-oxidation performance is significantly reduced, and its service life can only reach 2000 hours

In addition, in the process of producing Cr20Ni80, due to the unreasonable design of the preparation process, sometimes the ingot breaks and cracks during the forging process, which seriously affects the service life of the finished product and is far from meeting the mechanical properties of industrial heating elements. Require

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