Unified Numbering System

Unified numbering system

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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.

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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

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