From a machinability point of view, ferritic and martensitic stainless steels are classified as ISO P: Steel.

Normal chromium content is 12% to 18%, with only small additions of other alloying elements.

Martensitic stainless steels have relatively high carbon content which makes them hardenable. Ferritic steels have magnetic properties.

Weld-ability is low for both ferritic and martensitic and medium to low resistance against corrosion, which increases with a larger chromium content.

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