Points : Application of Alloy Steel, Definition Definition Alloy steels are usually made with more care than are carbon steels. Structural grade alloy steels, as identified by ASTM specifications, are used mainly in the construction and transportation industries because of their high strength. Other alloy steels are used in applications where strength, hardness, creep and fatigue resistance, and toughness are required. These steels may also be heat treated to obtain the desired properties.
In order to improve the strength-to-weight ratio of steels, a number of high-strength low-alloy (HSLA) steels have been developed. These steels have a low carbon content, usually less than 0.30 percent, and are characterized by a microstructure consisting of fine/grain ferrite and a hard second phase of martensite and astatine. First developed in the 1930s, HSLA steels are usually produced in sheet form by micro alloying and controlled hot rolling. Plates, bars, and structural shapes are made form these steeIs However, the ductility formability, and weldability of HSLA steels are generally inferior to conventional low-alloy steels. To improve these properties dual phase steels have been developed.
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