Martensitic stainless steels contain 12,5 - 18% Chrome (Cr) and 0,10 - 1% Carbon (C) content. Martensitic group is the smallest group of all the stainless steels.

Carbon (C) content is comparatively higher in Martensitic grades, in order to obtain better strength and hardness. Martensitic grades contain very low or no Nickel (Ni) and Molybdenum (Mo). The whole group is magnetic.

All of the Martensitic grades, except 410 grade, can be hardened with heat treatment (quenching and tempering) up to 45 - 60 Rockwell. If the Carbon (C) content is below 0,17%, the hardness will not exceed 45 Rockwell. The potential hardness of the material is directly corrolated with the Carbon (C) content. More Carbon (C) content with achieve harder materials after the heat treatment.

Heat resistance is limited in this group. These grades are not recommended for grades higher than 400 °C. Machining and cold forming is done in annealed condition. But optimal corrosion resistance is gained after the heat treatment.

AISI 420 is the most widely used grade of this group. They are available in Bars and rarely in Coils/Sheets form. Bars are sold either in annealed or Q&T (quenched and tempered) condition. You may find the full size range of 420 bars in Teknik Metal stocks in annealed condition.

AISI 431 grade is the Nickel (Ni) containing grade in the Martensitic group. This grade has better mechanical properties and machinabilty than 420. Nickel addition brings along better hardenability and toughness. And it leads to better corrosion resistance after heat treatment. You may find the full size range of 431 bars in Teknik Metal stocks in annealed condition.







Given data is based on theoritical vaules and intended as informative purposes only. Given data may be revised at any time without prior notice. Stainless steels may vary in performance under different circumstances. Teknik Metal Endustri Malz. Tic. Ve San. A.S. disclaims any and every liability, and will not be held responsible for any consequences derived from the end use or the application of the materials.