ASTM A588/A588M Standard Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi [345 MPa] Minimum Yield Point, with Atmospheric Corrosion Resistance.ASTM A588/A588M specification covers high-strength, low-alloy structural steel shapes, plates, and bars for welded, riveted, or bolted construction with atmospheric corrosion resistance.ASTM A588/A588M Standard main steel grade:ASTM A588Grade A,BC,K(A588GRA,A588GRB,A588GRC,A588GRK)