Malleable iron-chromium-aluminum ferritic electrothermal alloy

Abstract

The invention discloses a malleable iron-chromium-aluminum ferritic electrothermal alloy, which comprises the following chemical compositions in percentage by mass: less than or equal to 0.01 percent of C, less than or equal to 0.05 percent of N, less than or equal to 0.1 percent of Si, less than or equal to 0.08 percent of Mn, 21.5 to 31 percent of Cr, less than or equal to 3.0 to 6.0 percent of Al, less than or equal to 0.030 percent of P, less than or equal to 0.030 percent of S, and the balance of Fe and inevitable impurities. The malleable iron-chromium-aluminum ferritic electrothermal alloy not only has excellent corrosion resistance, but also has good toughness, lower cost than a nickel-chromium electric stove wire, service temperature 300 DEG C higher than the nickel-chromium electric stove wire and long service life.

Description

technical field [0001] The invention relates to metal functional materials, in particular to an iron-chromium-aluminum ferrite electric heating alloy with excellent toughness. Background technique [0002] In recent years, the price of rare metal nickel has soared, which has doubled the price of austenitic stainless steel. The application of nickel-based austenitic stainless steel has been seriously affected, while the use of ferritic and horse-based stainless steel has been further expanded. High chromium (25-31%) Ferritic stainless steel not only has excellent corrosion resistance, but also has excellent stress corrosion resistance, crevice corrosion resistance, and pitting corrosion resistance. It can replace expensive nickel-based and titanium and other advanced corrosion-resistant alloy materials. Although high-chromium ferritic stainless steel has excellent corrosion resistance, its severe brittleness prevents it from being widely used. Aluminum-containing high-chromi...

AI Technical Summary

Problems solved by technology

[0003] The existing iron-chromium-aluminum electric furnace wire has a relatively high carbon content. After using at high temperature, during the cooling process with the furnace, M 23 C 6 The precipitation is inevitable, especially when the furnace wire is used at high temperature for a long time, the grains grow very thick, the number of grain boundaries is relatively reduced, and the entire grain boundary is covered with network M 23 C 6 , the degree of brittleness is more severe