Unified Numbering System for Reactive and Refractory Metals and Alloys

The Unified Numbering System discovered by SAE and ASTM is a composition-based system of commercial alloys and metals. These materials are provided with a letter each and this letter is followed by five numbers that together develop an identification number for each alloy and metal.

The reactive and refractory metals and alloys include boron, hafnium, molybdenum, niobium, tantalum, thorium, tungsten, vanadium, berylium, chromium, cobalt, rhenium, titanium and zirconium.

The table below provides the unified numbering system for all the reactive and refractory metals and alloys.

UNS Designations for Reactive and Refractory Metals and Alloys

UNS Designation
Reactive and refractory Metals and Alloys
R01001- R01999
Boron
R02001- R02999
Hafnium
R03001- R03999
Molybdenum
R04001 - R04999
Niobium (Columbium)
R05001 -R05999
Tantalum
R06001 -R06999
Thorium
R07001 - R07999
Tungsten
R08001 - R08999
Vanadium
R10001 - R19999
Berylium
R20001 - R29999
Chromium
R30001 - R39999
Cobalt
R40001- R49999
Rhenium
R50001 - R59999
Titanium
R60001 - R69999
Zirconium

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