Unified Numbering System for Welding Filler Metals

Jul 2 2012

The Unified Numbering System provides an identification number for alloys and metals. This number comprises a letter that is followed by five numbers. Developed by SAE and ASTM the UNS correlates varied numbering systems for alloys and metals.

Welding filler metals comprise carbon steel without important alloying elements, alloy steels and alloys. The alloy steels include manganese-molybdenum low alloys steels, austenitic stainless steels, nickel low alloy steels, ferritic stainless steels and chromium low alloy steels.

The table below provides a list of the welding filler metals with the Unified Numbering System.

UNS for Welding Filler Metals

UNS Series Welding Filler Material
W00001- W09999 Carbon steel with no significant alloying elements
W10000- W19999 Manganese-molybdenum low alloys steels
W20000- W29999 Nickel low alloy steels
W30000 - W39999 Austenitic stainless steels
W40000 - W49999 Ferritic stainless steels
W50000 - W59999 Chromium low alloy steels
W60000 - W69999 Copper base alloys
W70000 - W79999 Surfacing alloys
W80000 - W89999 Nickel base alloys

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