This is a carbon, martensitic stainless steel with moderate corrosion resistance, good strength and the ability to obtain and keep moderate hardness (RC 55-57) and wear resistance. This is an older steel alloy, and might be thought of as similar in performance to 420HC steel.
Carbon-0.45-0.50%, Manganese-0.40%, Chromium-14.50-14.80%, Vanadium-0.10%, Molybdenum-0.60%