Austenitic stainless steels 
This type of grades covers the biggest part of Stainless Steel grades. What defines this grades is a chromnium percentaje over 15%  They are resistant to different types of corrosion caused by chemical influences. One specific type of Austenitic Stainless Steel grades are the Heatresistant stainless steel grades  which maintain their mechanical properties when exposed to elevated temperatures.

Duplex-Superduplex
Austenitic-ferritic stainless steels(duplex steels) are characterised by comparatively lower presence of nickel compared to standard austenitic grades. Their main feature are the mechanical qualities, particularly their high stress corrosion cracking resistance. They are especially suitable for off shore applications and in the chemical industry.

Nickel based alloys
Nickel alloys are normaly considered when Nickel percentage is over 25%. These grades offer a  the highest  degree of corrosion resistance which makes it possible to use them in a wider range of applications due to their resistance to various acids (sulphuric acid, hydrochloric acid, phosphoric acid).

Note: Nickel based alloys are manufactured at TTI, Spain , SBER-Austria and Salem-USA