American Society for Testing and Materials. A non-profit organization which provides a forum for producers, users, ultimate consumers, and those having general interest (representatives of government and academia) to meet on common ground and write standards for materials, products, systems and services. ASTM standards are used to set the basic standards which define the requirements and procedures governing steel products. ASTM provides a numbering system as a reference point used throughout the industry (example: ASTM A653 which covers sheet steel produced by the hot-dipped galvanizing process).

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