Stainless Steel

ATI Allegheny Ludlum produces a wide variety of stainless steel alloys known for their excellent corrosion and heat resistance. Ferritic (Chromium) grades are magnetic, non-nickel bearing alloys that have greater inherent strength and corrosion resistance than carbon steel. Most ferritic stainless steels are part of the 400 series (as are most of the martensitic grades). Austenitic (Chromium-Nickel) grades were developed for enhanced surface quality and formability and increased corrosion and wear resistance. These include the common 200 series and 300 series alloys. Austenitic alloys are non-magnetic in the fully annealed condition, but may become magnetic when cold worked due to martensite formation. Superferritic and Superaustenitic alloys contain significant additions of chromium, nickel, molybdenum or copper and are used where extra corrosion protection, strength or heat resistance are required. Duplex grades are alloys that are partially ferritic and partially austenitic, giving them a combination of properties that is often superior to that of single phase alloys. Martensitic and Precipitation Hardened alloys are typically used in applications requiring very high strength. Most of ATI Allegheny Ludlum’s stainless steels are offered in sheet, strip and plate product forms.