ASME SA709/SA709M is Standard Specification for Structural Steel for Bridges. ASME SA709/SA709M Standard main steel grade:ASME SA709Grade 36,50,50S,50W,100,100W(SA709GR36,SA709GR50,SA709GR50S,SA709GR50W,SA709GR100,SA709GR100W)and so on.