Nickel-chromium high-resistance electrothermal alloy

Abstract

The invention discloses a nickel-chromium high-resistance electrothermal alloy. The alloy is characterized by comprising the following components in percentage by mass: 0.02 to 0.06 percent of C, 0.010 to 0.020 percent of P, 0.010 to 0.015 percent of S, 0.02 to 0.60 percent of Mn, 1.00 to 1.50 percent of Si, 20.0 to 23.0 percent of Cr, 0.1 to 0.20 percent of Al, 0.4 to 0.8 percent of Fe, 0.1 to 0.20 percent of Ti, 0.20 to 0.50 percent of Zr, 0.01 to 0.05 percent of RE and the balance of Ni. Metal zirconium and a rare-earth material are added into a metal alloy, the zirconium is contacted with the air to form a zirconia protective layer, so that the surface oxidation resistance of the alloy is greatly improved; and moreover, far infrared rays can be generated, and heating is uniform, so that the highest operating temperature of the alloy steel can be up to 1,300 DEG C, and the surface load of the alloy steel can be up to 5 W / cm<2>.

Description

technical field [0001] The invention relates to an alloy material, specifically a nickel-chromium high-resistance electrothermal alloy, which belongs to the field of metallurgy. Background technique [0002] High-resistance electrothermal alloys refer to alloys that are used to manufacture electric heating elements with resistance as the main characteristic. This type of alloy can be divided into iron-chromium-aluminum alloys, iron-chromium-nickel alloys, nickel- Three types of chromium alloys. Commonly used grades are 0Cr25Al5, 0Cr21Al6Nb, Cr15Ni60, Cr20Ni80, Cr30Ni70, etc. Cr20Ni80 (nickel-chromium wire) alloy has excellent comprehensive properties and is the first choice for making high-quality electric heating elements. It has good oxygen resistance, high strength, non-magnetic, high emissivity, good corrosion resistance, and no softening. Series of advantages, no deformation and small permanent elongation when used for a long time, the chemical composition and mass pe...

AI Technical Summary

Problems solved by technology

The maximum service temperature of components made of other alloys is 1200 ° C, and the surface load rate (surface power) is 1.5 W / cm 2 , when the material needs to be subjected to high temperature conditions above 1200°C, it is prone to cracking and waving, and its physical and chemical properties such as tensile strength and yield strength are not ideal