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When were A36 and A6 steels in general use for building construction?

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ASTM A36 was the common structural steel used in building construction from the early 1960s to the late 1990s. The ASTM A6 Standard is not a specific material type per se, but rather a Standard Specification for General Requirements for Rolling Structural Steel Bars, Plates, Shapes, and Sheet Piling, which defines the cross sections and tolerances for hot-rolled shapes.