Martensitic stainless steels are the first branch of the plain chromium stainless steels. These were the first stainless steels industrially developed (as stainless steel cutlery). They have a relatively high carbon (C) content and a chromium (Cr) content of 12 to 18%.
The common specifications are wrought 410, 420, 431 and the cast CA-6NM,
Basic properties of the martensitic stainless steels include:
- Moderate corrosion resistance
- Pardonable by heat treatment and therefore high strength and hardness levels can be developed
- Very limited weldability
- Lower ductility than ferritic grades.
Common uses include applications that need strength and hardness such as knife blades, surgical instruments, fasteners, spindles, nozzles, shafts, impellers and springs.