large diametre of 100-500mm material Q195 Q235 Q345 Standard:ASTM AISI GB round steel(1)Size: Diameter: 100-500mm(2)Standard:,AISI ,GB, ASTM, ISO(3)Quality: DIN: ST37-2, C22E, C25E, C35E, C45E, S255NJIS: SS400, S20C, S25C, S35C, S45C, YAW-TEN50ASTM: 1020, 1025, 1035, 1045, 1050, 1053, Gr-ePayment terms 30%T/T in advance and balance agaist receipt of B/L copy large diametre round steel bar