Malleable high chromium ferritic alloy

Abstract

The invention discloses a malleable high chromium ferritic alloy, which comprises the following chemical compositions according to weight percentage: less than or equal to 0.001 percent of C, less than or equal to 0.001 percent of N, less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, 29 to 31 percent of Cr, less than or equal to 0.12 percent of Mo, less than or equal to 0.014 percent of P, less than or equal to 0.003 percent of S, and the balance of Fe and inevitable impurities. The stability ratio of the Mo to (the C and the N) is 8 to 20. The malleable high chromium ferritic alloy has excellent corrosion resistance and toughness.

Description

technical field [0001] The invention relates to metal functional materials, in particular to a high-chromium ferrite 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. Ferrite exists C and N interstitial elements in stainless ...

AI Technical Summary

Problems solved by technology

Ferrite exists C and N interstitial elements in stainless steel to strongly form and stabilize austenite, which is very harmful to ferritic stainless steel, mainly because the diffusion speed of C and N elements in ferritic stainless steel is fast, about 600 times that of the ferritic stainless steel. During the cooling process after high temperature heating, carbon and nitride will precipitate out, resulting in ferritic stainless steel brittleness at 475 ° C, high temperature brittleness, low room temperature toughness, high brittle transition temperature, and sensitivity to notches, etc. shortcoming