Stainless Steel Grades


They are iron, chromium, nickel and carbon alloys. Adding nickel modifies the structure of these materials.

The stainless steel that characterizes this group is AISI 304, EN 1.4301.

This is the stainless steel group with significant benefits for manufacturing components and equipment, as well as service performance. They have excellent forming properties, great corrosion resistance and are very easy to weld.

Gas storage sphere tanks and pipeline in oil refinery industrial plant
manufacturing of a ferritic stainless steel car exhaust


Ferritic stainless steels are also iron, chromium and carbon alloys, with higher chromium and lower carbon content than martensitic stainless steels. The typical values of these elements are C < 0.10%, Cr 16 – 18%.


Duplex stainless steels are microstructurally constituted by two phases: ferrite and austenite. As alloying elements, they contain iron, chromium, carbon and nickel, with the latter being at a lower percentage than in austenitic stainless steels.

In general, they have higher mechanical properties and corrosion resistance than ferritic and austenitic stainless steels.

acero inoxidable duplex