Stainless Steel Round Bar 440A is a martensitic stainless steel alloy containing chromium for corrosion resistance, high carbon for hardness and strength, and molybdenum for enhanced corrosion resistance. This grade offers excellent hardness, high wear resistance, and moderate corrosion resistance, making it suitable for applications requiring good mechanical properties combined with some corrosion resistance, such as bearings, shafts, valve components, and cutting tools.