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About Carbon Steels and Alloy Steels
Carbon steels and alloy steels are ferrous alloys that contain carbon and other alloying elements such as manganese, chromium, molybdenum, and nickel. They are used in a wide variety of industrial applications. Many materials meet the compositional standards of the Unified Numbering System (UNS), a specification established by the American Society for Testing and Materials (ASTM), the Society of Automotive Engineers (SAE), and metal trade associations such as the American Iron and Steel Institute (AISI) and the Aluminum Association (AA). The UNS assigns metals and alloys a lettered prefix and a five-digit number. For example, carbon steels and alloy steels belong to the UNS G category and have designations such as UNS G10950. AISI-SAE is another common specification. Other standards include European Norm (EN) and U.S. military specifications (MIL-SPEC). QQ and QQS prefixes are used to designate specific MIL-SPEC metals.
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Engineering Web: Carbon Steels and Alloy Steels - Machine Design
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Alloy Steel | Machine Design Steels that contain specified amounts of alloying elements -- other than carbon and the commonly accepted amounts of manganese, copper, silicon, |
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Carbon Steel | Machine Design Standard wrought-steel compositions (for both carbon and alloy steels) are designated by an AISI or SAE four-digit code, the last two digits of which |
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Steels for Strength | Machine Design Heat-treated constructional alloy steels and the ultrahigh-strength steels are used in applications where high strength can be converted to a |

