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4.4.2 Quenched and Tempered SteelsA variety of steels are processed at the producing mill by quenching and tempering (Q&T). The quenching operation hardens the steel, while the tempering operation increases its toughness and ductility. One of the first popular Q&T steels was ASTM A514, which is a martensitic steel with 100 ksi minimum specified yield strength. ASTM A514 can be, and is, successfully welded every day, but it can be problematic when the proper procedures are not followed. This back- ground is provided to explain a common, albeit inaccurate, perception of quenched and tempered steels: They are often assumed to be high strength, martensitic, and hard to weld. As will be seen, for some Q&T steels, none of these characteristics apply.
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