Ferritic

Ferritic stainless steels (400 series) contain 10.5% to > 30% chromium. . They are non-hardenable by heat treating, and always magnetic. Ferritic stainless steel is used in applications where resistance to corrosion and elevated temperature oxidation is important. The lower chromium (11%) ferritics are primarily used in automotive exhaust. Ferritics with intermediate chromium contents (15 – 17%) are used for automotive trim, hot-end exhaust, appliances and cooking utensils. The high-chromium ferritics (18 – 30%) are used in applications that require the greater resistance to corrosion and oxidation. Such applications can include hot-end exhaust, chimney liners, appliances and many others. Additional ferritic products include Cleveland-Cliffs aluminized 409 and 439 which provide enhanced cosmetic corrosion protection.  Special ferritic alloys with an aluminum addition provide superior scale resistance and electrical resistance properties for specialized applications.