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Metals Codes - 3: The AISI/SAE Steel Designation System
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor. | ||||||
As mentioned on the previous page the UNS system is derived from the older AISI/SAE system. However since the older system has been used for such a long period of time and since all machinists do not recognize the UNS coding, the AISI/SAE system is defined here as well. With one exception the first digit signifies the major alloy used in the steel. Carbon steels are not alloyed. Key to the AISI/SAE steel numbering system The first two numbers in this designation signify the primary alloy(s) of the steel. The next two numbers in the designation signify the amount of carbon present in the steel. |
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As shown, the AISI / SAE steel designation system gives information about the chemical composition of the steel (alloy type and carbon content). However, in many cases, this is not enough information for the purchasing company to procure the steel. The ASTM specification of fabrication methodology will often be added to the material specifications demonstrated but fabrication methods will not be discussed here. It remains to be seen how the UNS will designate manufacturing specifications.
Following are two examples of UNS designators and how they relate to AISE/SAE designations:
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label: standards, UNS, AISI,ASTM, ASE, coding, steel, stainless steel, tool steel, aluminum, copper, austenetic, martensitic, ferritic, precipitatin hardening |
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