ASTM A871-65 is a high strength low-alloy structural steel plate with improved atmospheric corrosion resistance. This specification provides for a 65ksi minimum yield strength and an 80ksi minimum tensile strength plus the atmospheric corrosion resistance of this steel in most environments is substantially better than that of carbon steels with Weathering Steel Specifications & Benefits Central Steel ASTM A588 covers structural shapes, plate, and bar. ASTM A242 covers steel plate through one-half inch in thickness. ASTM A606-4 covers steel sheet and coil and ASTM A847 is for weathering steel tube and pipe. ASTM A871-65 also cover plate, but with a 65ksi minimum yield strength.