Unified alloy numbering system

The nominal chemical composition and identification of the most important copper castiag alloys are Hsted ia Table 7. These alloys are ideatifted by name and by the Unified Numbering System. The use of names is not recommended. 

Metals and Alloys in the Unified Numbering System, 6th ed., SAE/ASTM, Warrendale, Pa., 1993. 

Metals Alloys in the Unified Numbering System, 10th ed., S AE International, Warren-dale, PA, 2004. 

The first orderly methods of identifying materials were developed by metal manufacturers trade associations. National standards organizations have also created materials identification systems. In the United States, the Unified Number System merges all systems into one method of identifying commercially available metals and alloys. 

UNS. Unified Numbering System satisfies the need for a common designation system for all alloys. The UNS number uniquely identifies the chemical composition of alloys that have been fixed by other organizations, such as one of the metal manufacturers associations. If the alloy is proprietary or produced by a limited number of suppliers, the chemical composition is established by the supplier. The... 

Figure 2-8. Unified Numbering System satisfies the need in the United States for a common designation system for all alloys.

Alloys are nsnally designated by the Unified Numbering System (UNS) [7, 8], which incorporates earlier identihcation systems developed for particular alloy families such as aluminum and copper alloys. The UNS system is particnlarly useful when designating proprietary alloys snch as the nickel-based alloys. Ordinary alloy designations that are nonproprietary, snch as those of the 300-series stainless steels, are commonly used instead of the UNS nnmber. 

Society of Automotive Engineers and American Society for Testing and Materials. Current edition. Metals and Alloys in the Unified Numbering System. Warrendale, PA ASTM International. American Society for Testing and Materials. Current edition. Standard Practice for Numbering Metals and Alloys (UNS). ASTM E 527. Warrendale, PA ASTM International. 

The materials studied over the course of this program are listed in Table I. Each of these specimens was characterized by chemical composition, RRR, hardness, thermal history, and, in some instances, by grain size. Details of these characterizations are given in the six-volume series Materials Research in Support of Superconducting Machinery [ ]. Whenever possible, alloys are designated using the Unified Numbering System [" ] ... 

Unified Numbering System for Metals and Alloys, SAE J1086 or ASTM DS-56, Society of Automotive Engineers, Inc., Warrendale, Pennsylvania (1974). 

MatWeb, http //www.matweb.com, is a searchable database of over 46,000 metals, plastics, ceramics, and composite materials. It allows search by material type, trade name, range of values, composition, UNS number (Unified Numbering System for Metals and Alloys) and even system of units (metric, common US units). An example of searchable materials includes thermoplastic and thermoset polymers such as ABS, nylon, polycarbonate, polyester, polyethylene, and polypropylene metals such as aluminum, cobalt, cop-... 

The materials on copper basis may be subdivided into the groups shown in Table 3.1-101. Standards for copper and copper materials have been issued by ASTM, DIN, DKE, CEN, CENELEC, ISO, and lEC. In the USA, the Unified Numbering System for Metals and Alloys (UNS) applied to Cu materials consists of the letter C and a 5 digit number. More extensive accounts of Cu and Cu alloys as materials are given in [1.102-104],... 

One area of confusion can be distinguishing report numbers from specification numbers. Engineers and librarians confuse letter and number combinations that are not standards, but grades of metal. Indexes and handbooks help by listing alloys to clear that confusion. ILI Metals Infobase identifies specific numbers, gives chemical content, and includes equivalencies. Metals Alloys in the Unified Numbering System correlates many international number systems. 

At the present time there are three designation systems commonly used for cast materials. They are (1) the Unified Numbering System (UNS), (2) Alloy Casting Institute (ACI), and (3) the American Society for Testing and Materials (ASTM). 

Numbering System and the Unified Numbering System (UNS) that were developed by ASTM and SAE to apply to all commercial metals and alloys, define specific alloy compositions. Table 5.1 through Table 5.3 provide a comparison between ASI and UNS designation for stainless steels. 

Unified Numbering System for Wrought Copper and Copper Alloys... 

The Unified Numbering System (UNS), as used for other metals, is also used for aluminum. A comparison for selected aluminum alloys between the Aluminum Association designation and the UNS designation is shown in Table 19.2. 

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