Unified numbering system
1
Unified numbering system 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 categories[1] 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
Unified numbering system
References [1] 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 (http://www.matweb.com/search/SearchUNS.aspx) Entering the UNS number shows a data sheet on the alloy.
2
Article Sources and Contributors
Article Sources and Contributors Unified numbering system Source: http://en.wikipedia.org/w/index.php?oldid=426907714 Contributors: A2Kafir, Ampcometal, BlackNeo, Bronzeman53, Chetvorno, Drij, Graibeard, Havealife, Hit bull, win steak, Ruby2lips, SamuelFreli, Wizard191, Ytrottier, 3 anonymous edits
License Creative Commons Attribution-Share Alike 3.0 Unported //creativecommons.org/licenses/by-sa/3.0/
3
