ASTM E140

ASTM E140 is a standard that provides a classification system for the hardness of metals, especially steels and cast irons. Hardness refers to a material’s resistance to indentation or scratching. This standard establishes test methods and a scale (like the Rockwell scale) to measure how hard a metal is. By using ASTM E140, engineers and manufacturers can consistently compare materials, select suitable alloys for specific applications, and ensure quality control. In essence, it creates a common language for understanding and communicating metal hardness across different industries.