115:, tubes, bars, etc.), purpose (high temperature, boilers and pressure vessels, etc.) and testing methods are all specified in the material or standard specification which is created by various trade and professional organizations. Many material or standard specifications include a number of different UNS numbers that may be used within that specification.
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designation schemes for various alloys. This meant that the same number might be used for different alloys, different numbers might be used for the same alloy or different trade names might indicate similar or wildly different alloys. Additionally, the increasing number of new alloys meant that the problem would only get worse.
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During the early 20th century many different metal alloys were developed in isolation within certain industries to meet the needs of that industry. This allowed a wide variety of competing standards, compositions and designations to flourish. By the 1960s there were a number of differing numbering or
406:, literally "unified numeric designator") is used in China in parallel to the composition-based nomenclature. Individual grades may receive the same number (e.g. S31603), a slightly different number (e.g. S30400/S30408, S17400/S17440), or a totally different one (e.g. S20200/S35450, S41026/S45710).
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For example, Stainless Steel Type 310 in the original 3-digit system became S31000 in the UNS System. The more modern low-carbon variation, Type 310S, became S31008 in the UNS System. Often, the suffix digit is chosen to represent a material property specification. For example, "08" was assigned to
531:"Stainless steel grades listed in the international standard ISO 15510:2010 Comparative designations of grades with similar composition from other important standards. (listed by type of steel structure and by increasing intermediate 3-digits code of the ISO name)"
66:
In
January 1971, an 18-month study recommended that a unified system would be possible and helpful. An advisory board was established in April 1972 to establish the Unified Numbering System (UNS). The UNS is managed jointly by the
575:
ASTM A182/A182M β 12a: Standard
Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
54:. A UNS number alone does not constitute a full material specification because it establishes no requirements for material properties, heat treatment, form, or quality.
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A UNS number only defines a specific chemical composition, it does not provided full material specification. Requirements such as material properties (
162:, and so on. The first 3 digits often match older 3-digit numbering systems, while the last 2 digits indicate more modern variations.
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UNS S31603 is 316L, a low carbon version of 316. The digits "03" were assigned since the maximum allowed carbon content is 0.03%
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It consists of a prefix letter and five digits designating a material composition. For example, a prefix of S indicates
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HS-1086 provides a cross-reference between various designation systems and the chemical composition.
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This article is about the metal alloy numbering system. For the dental notation system, see
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134:). Conversely, A312 pipes could be made out of about 70 different UNS alloy steels.
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559:"GB/T 17616-2013 Unified numbering system for designation of iron,steel and alloy"
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UNS S17400 is ASTM grade 630, Cr-Ni 17-4PH precipitation hardened stainless steel
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1.4301 stainless steel) could be used to make stainless steel bars (
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UNS S31008 because the maximum allowed carbon content is 0.08%.
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Some common materials and translations to other standards:
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AISI and SAE carbon and alloy steels (except tool steels)
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Entering the UNS number shows a data sheet on the alloy.
464:"Unified Numbering System (UNS) for Metals and Alloys"
492:(27th ed.). Industrial Press Inc. p. 440.
126:) or stainless steel plates for pressure vessels (
329:Heat and corrosion resistant (stainless) steels
210:Rare earth and rare earthlike metals and alloys
194:Copper and copper alloys (brasses and bronzes)
118:For example: UNS S30400 (SAE 304, Cr/Ni 18/10,
442:"The Naming and Numbering of Stainless Steels"
400:A UNS-derived system known as ISC (in Chinese
28:Unified Numbering System for Metals and Alloys
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266:Miscellaneous nonferrous metals and alloys
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250:Miscellaneous steels and ferrous alloys
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42:. Each UNS number relates to a specific
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38:designation system widely accepted in
202:Specified mechanical property steels
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374:UNS S30400 is SAE 304, Cr/Ni 18/10,
83:UNS number vs material specification
538:International Stainless Steel Forum
446:Advanced Materials & Processes
440:Cobb, Harold M. (September 2007).
307:R04xxx- Niobium (Columbium) Alloys
46:or alloy and defines its specific
14:
488:Oberg, Erik; et al. (2004).
242:Cast steels (except tool steels)
99:, etc.), heat treatment, form (
337:Tool steels, wrought and cast
258:Low-melting metals and alloys
16:Metal alloy designation system
1:
298:Refractory metals and alloys
186:Aluminum and aluminum alloys
368:UNS K11547 is T2 tool steel
290:Precious metals and alloys
638:
516:Overview of the UNS system
21:Universal Numbering System
18:
589:UNS Number Lookup, MatWeb
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304:R03xxx- Molybdenum Alloys
282:Nickel and nickel alloys
272:M1xxxx - Magnesium Alloys
75:. The resulting document
319:R6xxxx- Zirconium Alloys
452:(9). ASM International.
316:R5xxxx- Titanium Alloys
310:R05xxx- Tantalum Alloys
378:1.4301 stainless steel
345:Welding filler metals
234:AISI and SAE H-steels
381:UNS S31600 is SAE 316
353:Zinc and zinc alloys
313:R3xxxx- Cobalt Alloys
490:Machinery's Handbook
158:alloys, T indicates
146:alloys, C indicates
48:chemical composition
563:openstd.samr.gov.cn
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69:ASTM International
360:Example materials
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350:Z00001 to Z99999
342:W00001 to W99999
334:T00001 to T99999
326:S00001 to S99999
295:R00001 to R99999
287:P00001 to P99999
279:N00001 to N99999
263:M00001 to M99999
255:L00001 to L99999
247:K00001 to K99999
239:J00001 to J99999
231:H00001 to H99999
223:G00001 to G99999
215:F00001 to F99999
207:E00001 to E99999
199:D00001 to D99999
191:C00001 to C99999
183:A00001 to A99999
93:ultimate strength
73:SAE International
52:physical property
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541:. Retrieved
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470:. 2012-06-29
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416:Steel grades
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130:) or pipes (
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218:Cast irons
175:UNS series
160:tool steels
599:Categories
474:2020-01-06
427:References
132:ASTM A312
128:ASTM A240
124:ASTM A276
543:10 March
468:AZoM.com
410:See also
376:Euronorm
120:Euronorm
97:hardness
34:) is an
113:flanges
58:History
605:Alloys
496:
403:η»δΈζ°ε代ε·
156:bronze
148:copper
138:Format
109:forged
101:rolled
615:Steel
534:(PDF)
154:, or
152:brass
44:metal
36:alloy
545:2023
494:ISBN
105:cast
71:and
26:The
450:165
391:903
389:CDA
77:SAE
32:UNS
601::
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301:eg
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30:(
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