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This SAE Recommended Practice describes a unified numbering system (UNS) for metals and alloys which have a "commercial standing" (see 6.1), and covers the procedure by which such numbers are assigned.
Section 2 describes the system of alphanumeric designations or "numbers" established for each family of metals and alloys.
Section 3 outlines the organization established for administering the system.
Section 4 describes the procedure for requesting number assignment to metals and alloys for which UNS numbers have not previously been assigned.