Martensitic stainless steel

- AISI 430, 440

"Martensitic stainless steel is a specific type of stainless steel alloy.

Martensitic stainless steels can be high or low-carbon steels built around the Type 410 composition of iron, 12% chromium, and up to 1.2% carbon.They are usually tempered and hardened.

Tempered martensite gives steel good hardness and high toughness; used largely for medical tools (scalpels, razors and internal clamps).Untempered martensite is low in toughness and therefore brittle". (From Wikipedia)

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