Ferritic stainless steel refers to stainless steel with chromium content of 1 1%~30%, body-centered cubic crystal structure and ferrite structure in use. The corrosion resistance of ferritic stainless steel mainly shows excellent local corrosion resistance such as chloride stress corrosion, pitting corrosion and crevice corrosion. Ferritic stainless steel has high strength, but its cold working hardening tendency is low. Its thermal conductivity is 30%~50% of that of austenitic stainless steel, and its linear expansion coefficient is only 60%~70% of that of chromium-nickel austenitic stainless steel. However, ferritic stainless steel (especially ferritic stainless steel with Cr content greater than 16%) has some disadvantages, such as poor toughness at room temperature and low temperature and high notch sensitivity. It is sensitive to intergranular corrosion, and with the increase of cross-section size of ferritic stainless steel and the role of welding thermal cycle, these shortcomings are more strongly manifested. This article comes from: Bo Yan Alliance Forum ◆ Academic Exchange ◆ Scientific Research Mutual Assistance ◆ Resource Sharing * * *