ASTM A572 Specifications. A572 is the standard specification for high-strength low alloy columbium-vanadium structural steel. Lists five chemical recipes and five different mechanical property ranges for plate products (grades 42, 50, 55, 60, and 65). Relatively wide chemical and property ranges. Grade 50 high volume. Strength, Yield Strength ksi (MPa), Tensile Strength ksi (MPa):Strong, 60-80 (415-550)Speedy Metals Information for ASTM A572 Grade 50 PlateGrade 50 is used in general plate applications when the plate will be riveted, bolted, or welded. Grade 50 is a Columbium-Vanadium steel that offers a minimum yield of 50,000 PSI. In addition, ASTM A572 Grade 50 is noted for its increased resistance to atmospheric corrosion.