2. Martensitic stainless steels

2.1 Composition and properties

Martensitic stainless steels have a chromium content of around 12% and a variable carbon content, which determines their hardenability (tables 2 and 3 ). Steels with a relatively low carbon content are mainly used in boiler making. Indeed, the increased brittleness of steels with carbon content above 0.2% significantly increases the level of care required when cutting, forming and welding these steels.

Because of their chromium content (11-16%), "air quenching" is sufficient to obtain the desired mechanical properties, while limiting the risk of tapping during cooling. In a temperature range between 800 and...