Unified Numbering System for Rare Earth Metals and Alloys

Jul 1 2012

The Unified Numbering System was developed by ASTM and SAE in order to correlate a number of varied numbering systems for commercial alloys and metals. The UNS number is an identification number for each alloy and metal.

The following table is a list of rare earth and earth-like metals and alloys with their UNS numbering system ranging from E00001–E99999.

UNS for Rare Earth Metals and Alloys

UNS Designation
Rare Earth and Rare Earth-Like Metals and Alloys
E00000–E00999
Actinium
E01000–E20999
Cerium
E21000–E45999
Mixed rare earths
E46000–E47999
Dysprosium
E48000–E49999
Erbium
E50000–E51999
Europium
E52000–E55999
Gadolinium
E56000–E57999
Holmium
E58000–E67999
Lanthanum
E68000–E68999
Lutetium
E69000–E73999
Neodymium
E74000–E77999
Praseodymium
E78000–E78999
Promethium
E79000–E82999
Samarium
E83000–E84999
Scandium
E85000–E86999
Terbium
E87000–E87999
Thulium
E88000–E89999
Ytterbium
E90000–E99999
Yttrium

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