440A is a high-carbon high-chromium martensitic stainless steel designed to provide stainless properties with excellent hardness. The alloy has an excellent combination of strength, ductility, toughness, corrosion resistance, and fabricability. It attains a hardness of Rockwell C 56 and maximum toughness when heat treated and has good toughness at cryogenic temperatures and relatively high tensile and yield strengths at moderately high elevated temperatures. These properties further increase the versatility and usefulness of the alloy.
