The difference between ASTM and UNS
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UNS is the abbreviation of "UNIFIED NUMBERING SYSTEM". This is a convenient numbering system jointly designed by the American Society of Automotive Engineers (SAE) and the American Society for Testing and Materials (ASTM) in 1967. Its purpose is to replace or at least supplement the current standard product grade systems. A is for aluminum ； P stands for precious metal ； S stands for stainless steel, N stands for nickel and nickel alloys such as: In B564 N10276 (Hastelloy C276), N10276 is derived from the UNS number
ASTM is the abbreviation of American Society for Testing and Materials. It is an international organization that formulates and publishes various materials and testing standards. ASTM standards are widely used in engineering and scientific fields, including construction, chemistry, machinery and other fields. UNS is the abbreviation of "Unified Numbering System", which is a convenient numbering system jointly designed by SAE and ASTM. The UNS system is mainly used for the identification and classification of materials and metal alloys. Each UNS number corresponds to specific material composition and performance characteristics, making it easy to identify and compare differences and similarities between different materials. In summary, ASTM is an organization that develops and publishes various materials and testing standards, while UNS is a method of identifying and classifying materials and metal alloys through a numbering system. The two play different roles in the fields of materials and metals. .