Chromium grade of stainless steel with phosphorus and sulfur added to improve machinability. Most readily machinable of the stainless grades. It is magnetic in all conditions and capable of wide range of mechanical properties by heat treating.
ASTM A314, ASTM A582, AMS 5610
Corrosion resistance is similar to Type 410, and is resistant to atmosphere, fresh water, food acids, and neutral and basic salts. Maximum corrosion resistance of this grade is obtained by hardening and polishing.