Abstract
Addition of 1.0/1.3 pct copper has been used for precipitation hardening in a lowalloy steel containing less than 0.07 pct C, 0.40/0.70 pct Mn, 0.6010.90 pct Cr, 0.70/1.0 pct Ni, 0.15/0.25 pct Mo, and at least 0.02 pct Nb. This steel is included in ASTM Specifications as A710 Grade A for structural plates and as A736 for pressure vessel plates. A variety of strength and toughness combinations are provided by the selection of Class 1, Class 2, and Class 3 heat treatments.
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