Chromium-nickel stainless steel with added sulfur or selenium and phosphorus to improve machinability and non-seizing properties. It is the most free machining of the chromium-nickel grades. It is non-magnetic in the annealed condition and is not hardenable by heat treatment. Tensile strength and hardness can be increased by cold working.
ASTM A314, ASTM A320, ASTM A582, AMS 5640
Maximum corrosion resistance in the annealed condition. Free machining elements reduce overall corrosion resistance.