High Chromium Ferritic Stainless Steel UNS S44800
High chromium ferritic stainless steel UNS S44800 (UNS S44800, UNS S44700) is a kind of stainless steel with good corrosion resistance, oxidation resistance and thermal stability. It contains 18-20 wt. % chromium. S44800 has a wide range of uses, including chemical processing, food processing, oil and gas production, and general-purpose industrial purposes.
The composition of S44800 is as follows: Cr=18-20 wt%, Mo=2-2.5 wt%, Ni=1-1.5 wt%, and Mn=0.5-1 wt%. The low C and low P are insignificant. S44800 is known as a ferritic stainless steel, which is due to the presence of the ferrite phase. The ferrite phase is responsible for providing good corrosion resistance and oxidation resistance.
S44800 is an austenitic stainless steel. This means that it has a face-centered cubic lattice structure. This allows for movements of atoms and molecules that produce different properties than ferrite stainless steels. The austenitic structure provides excellent corrosion resistance to both acidic and neutral environments, as well as the ability to resist stress corrosion cracking. The austenitic structure also allows for easier cold and hot working of S44800.
S44800 can be used for a variety of applications in which corrosion resistance and oxidation resistance is important, such as chemical processing, food processing, oil and gas production, and general-purpose industrial uses. S44800 also provides excellent formability, weldability, and machinability. It can be used in high temperatures and aggressive environments. It is also resistant to chloride induced stress corrosion cracking.
S44800 is annealed at temperatures between 1050°C-1150°C and then cooled in the air or in a controlled atmosphere. This process is called solution annealing. It allows the metal to have a more consistent microstructure. It also improves the metals hardenability.
S44800 can also be heat treated to increase its strength and hardness. Heat treatment involves reheating the metal at temperatures between 900°C-1150°C, followed by quenching in water to reach the desired hardness. The heat treatment can also be used to produce a range of mechanical properties from high strength to high ductility.
S44800 is an economical and versatile stainless steel which is used in a wide range of industries and applications. It is known for its good corrosion resistance and oxidation resistance, which make it suitable for uses in harsh and aggressive environments. S44800 can also be heat treated for increased strength and hardness. It is available in various product forms, such as plates, sheets, bars, and tubes.
