Like the previous, also the ferritic stainless steels are the only chromium (varying from 11 to 30% [2]).

These steels have good mechanical strength and corrosion resistance. They have a body-centered cubic structure such as carbon steel, but they can not raise their mechanical properties by heat treatment.

Have a lower carbon content than martensitic. One type contains the heat-resistant 26% chromium. Other elements are molybdenum, aluminum to increase corrosion resistance, hot sulfur to facilitate handling.

The yield is very low and, not being able to heat treatment for the absence of critical points, you run the recrystallization and work hardening. You should not heat it over 850 ° C for not swell the grain, and not to stand between 400 and 570 ° C in cooling, in order to avoid the fragility of discovery.

The basic properties are: moderate corrosion resistance, which increases with the percentage of chromium and with the introduction of molybdenum alloy, it is magnetizable, and is not hardenable to use forever after annealing, the weldability is poor, because the material is heated undergoes the crystal grain coarsening due to chromium.

The most common uses are low-quality pottery or cutlery, sinks, sinks and finishes for the building. In thin sheets are used for coatings, plates for ship bridges, spillways, chain conveyors, Extraction of fumes and dust exhausters.

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