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The Unified Numbering System (UNS) is an alloy designation system widely accepted in North America. It consists of a prefix letter and five digits designating a material composition. A prefix of S indicates steel alloys, C for copper, brass, or bronze alloys, T for tool steels, etc. The first three digits often match older three-digit numbering systems, while the last two digits indicate more modern variations. For example, Copper Alloy No. 377 (forging brass) in the original three-digit system became C37700 in the UNS System. The UNS is managed jointly by the American Society for Testing and Materials and the Society of Automotive Engineers. A UNS number alone does not constitute a full material specification because it establishes no requirements for material properties, heat treatment, form, or quality.
Some common materials and translations to other standards:
- UNS K11547 is T2 tool steel
- UNS S17400 is ASTM grade 630, Cr-Ni 17-4PH precipitation hardening stainless steel
- UNS S30400 is AISI 304, Cr/Ni 18/10, Euronorm 1.4301 stainless steel
- UNS S31600 is AISI 316
- UNS S31603 is 316L, a low carbon version of 316
UNS Categories
| UNS Series |
Metal type(s) |
| A00001 to A99999 |
Aluminum and aluminum alloys |
| C00001 to C99999 |
Copper and copper alloys |
| D00001 to D99999 |
Specified mechanical property steels |
| E00001 to E99999 |
Rare earth and rare earthlike metals and alloys |
| F00001 to F99999 |
Cast irons |
| G00001 to G99999 |
AISI and SAE carbon and alloy steels (except tool steels) |
| H00001 to H99999 |
AISI and SAE H-steels |
| J00001 to J99999 |
Cast steels (except tool steels) |
| K00001 to K99999 |
Miscellaneous steels and ferrous alloys |
| L00001 to L99999 |
Low-melting metals and alloys |
| M00001 to M99999 |
Miscellaneous nonferrous metals and alloys |
| N00001 to N99999 |
Nickel and nickel alloys |
| P00001 to P99999 |
Precious metals and alloys |
| R00001 to R99999 |
Reactive and refractory metals and alloys |
| S00001 to S99999 |
Heat and corrosion resistant (stainless) steels |
| T00001 to T99999 |
Tool steels, wrought and cast |
| W00001 to W99999 |
Welding filler metals |
| Z00001 to Z99999 |
Zinc and zinc alloys |
External links
References
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