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Unformatted text preview: Low alloy steels Poor impact resistance at low Temp Alloys nonferrous brass, bronze, Al, Ni, ti Ferrous cast iron ( C>2.1 ) & steels ( C<1.4 ) low carbon( C<.25 ) no heat treatments (cold), ductility ( 25% ), tensile strength ( 450 mpa ) medium ( .25-.5 ) Hot and cold work, ductility ( 20% ), TS ( 650 Mpa ) high ( .6-1.4 ) Hot and cold work, ductility( 10% ), TS( 1Gpa ) Fe2O+3CO 2Fe+3CO2: Iron-C system Non Ferrous: aluminum and aluminum alloys Non magnetic, high strength to weight ration, resistance to corrosion, electrical/thermal conductivity Use of containers, transportation, electrical applications, airplanes, busses Brass (Cu and zinc), Bronze (copper and tin) for conductors Nickel and Nickel alloys for strength, toughness, food handling chemical processing equipment magnetic Steel Classification: AISI, SAE, ASTM 1020: low carbon, 1060 is medium and 1080 is high carbon Low alloy steels is <8% and high is >8% Manganese & Nickel: promotes austenitic structure, hardness, dissolves in iron Silicon: increases hardens, toughness...
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- Spring '10