Stainless Steel is named after its characteristics, it remains stainless, free from rust and discoloration. Stainless Steel has been used since the early 1800s evolving ever since. There are a few different types of stainless steels, the steels crystalline structure is what separates the austenitic, duplex, martensitic and ferritic steels from each other.
Austenitic Stainless Steel
Austenitic stainless steel has high levels of nickel and chromium. Austenitic steel is a non-magnetic steel. Out of all the different stainless steal families Austenitic Steel is the most popular. Austenitic steel can be cold treated to make them harder; they are also great to use in welding and easy to clean.
Duplex Stainless Steel
Duplex stainless steel is a mix of austenitic and ferritic steel. Duplex Stainless Steels are very high in chromium. The yield strength in Duplex Stainless Steel is much higher than that of Austenitic and Ferritic Steel which makes it perfect for construction use. Duplex Stainless Steel is very cost effective and corrosion resistant.
Martensitic Stainless Steel
Martensitic steels can be categorised into four categories. Fe-Cr-C grades, Fe-Cr-Ni-C grades, Precipitation hardening grades and Creep-resisting grades. These steels are used for engineering, tool and creep resisting steels. Unlike the above mentioned stainless steels Martensitic Stainless Steel can be heat treated, the steel is heated, rapidly cooled and heated again.
Ferritic Stainless Steel
Ferritic stainless steel has a ferrite microstructure similar to carbon steel. This type of stainless steel is also one of the few that is magnetic. Ferritic Steel can also be cold treated like Austenitic Stainless Steel but not to the same extent. They are most commonly used in the automotive industry, due to their weldability, and for home appliances.
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