1) X50CrMoV15 is a high hardness martensitic stainless steel. In strip form, its dominant use is for high quality knife blades. This is a rare, possibly a unique, example of the EN Name of a stainless steel grade being used for marketing purposes.
2) Approximate Composition – 15% Cr, 0.7% Mo, 0.15% V, 0.50% C (EN composition range. No ASTM equivalent).
3) X50CrMoV15 uses the moderately high carbon content of 0.50% to develop a high hardness martensitic microstructure. The higher chromium plus small molybdenum addition gives a greater corrosion resistance than standard martensitic grades. Vanadium allows higher tempering temperatures to be used and gives greater toughness.
(Source: British Stainless Steel Association, http://www.bssa.org.uk/)