ASTM A656/A656M Standard Specification for Hot-Rolled Structural Steel, High-Strength Low-Alloy Plate with Improved Formability.ASTM A656/A656M specification covers the three types and four strength grades of high strength low-alloy, hot rolled structural steel plate with improved formability. ASTM A656/A656M Standard main steel grade:ASTM A656Grade 50,60,70,80(A656GR50,A656GR60,70,A656GR80)