1301 - 13.2 Ferrous Alloys Metal alloys ● 403 Ferrous...

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Unformatted text preview: 13.2 Ferrous Alloys Metal alloys ● 403 Ferrous Nonferrous Steels Cast irons Low alloy Gray iron Ductile (nodular) iron White iron Malleable iron High alloy Low-carbon Medium-carbon High-carbon Plain High strength, low alloy Plain Heat treatable Plain Tool Stainless FIGURE 13.1 Classification scheme for the various ferrous alloys. carbon, which is normally less than 1.0 wt%. Some of the more common steels are classified according to carbon concentration, namely, into low-, medium-, and highcarbon types. Subclasses also exist within each group according to the concentration of other alloying elements. Plain carbon steels contain only residual concentrations of impurities other than carbon and a little manganese. For alloy steels, more alloying elements are intentionally added in specific concentrations. Low-Carbon Steels Of all the different steels, those produced in the greatest quantities fall within the low-carbon classification. These generally contain less than about 0.25 wt% C and are unresponsive to heat treatments intended to form martensite; strengthening is accomplished by cold work. Microstructures consist of ferrite and pearlite constituents. As a consequence, these alloys are relatively soft and weak, but have outstanding ductility and toughness; in addition, they are machinable, weldable, and, of all steels, are the least expensive to produce. Typical applications include automobile body components, structural shapes (I-beams, channel and angle iron), and sheets that are used in pipelines, buildings, bridges, and tin cans. Tables 13.1a and 13.1b, respectively, present the compositions and mechanical properties of several plain low-carbon steels. They typically have a yield strength of 275 MPa (40,000 psi), tensile strengths between 415 and 550 MPa (60,000 and 80,000 psi), and a ductility of 25%EL. ...
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This note was uploaded on 11/04/2010 for the course ACC 411 taught by Professor Kim during the Spring '08 term at Aberystwyth University.

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