420 Stainless Steel Round Bars and Sheet
Round bar: ASTM A276 - Condition A
Sheet: EN 10088-2 (1.4201), X20Cr13, 420 - Condition A
420 stainless steel is a higher carbon version of 410; like most non-stainless steels it can be hardened by heat treatment. 420 stainless will contain a minimum of 12 per cent chromium, sufficient enough to give it corrosion resistance properties. It has good ductility in the annealed condition and is capable of being hardened up to Rockwell Hardness 50HRC, the highest hardness of the 12 per cent chromium grades. Its best corrosion resistance is achieved when the metal is hardened and surface ground or polished.
Martensitic stainless steels are optimized for high hardness, and other properties are to some degree compromised. Fabrication must be by methods that allow for poor weldability and usually also allowed for a final harden and temper heat treatment. Corrosion resistance is lower than the common austenitic grades, and their useful operating temperature range is limited by their loss of ductility at sub-zero temperatures and loss of strength by over-tempering at elevated temperatures.
Typical applications include:
• Knife Blades
• Surgical Instruments
• Needle Valves
• Shear Blades