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 stainless 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 ASTM International and SAE International. 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 SAE 304, Cr/Ni 18/10, Euronorm 1.4301 stainless steel
- UNS S31600 is SAE 316
- UNS S31603 is 316L, a low carbon version of 316
| 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 |
See also
References
- ^ Oberg, Erik; et al. (2004). Machinery’s Handbook (27th edition ed.). Industrial Press Inc. p. 440. ISBN 0-8311-2700-7.
External links
- UNS Number Lookup, MatWeb Entering the UNS number shows a data sheet on the alloy.
This information originally retrieved from http://en.wikipedia.org/wiki/Unified_numbering_system
on Wednesday 3rd August 2011 4:41 pm EDT
Now edited and maintained by ManufacturingET.org
