... supply various round bar model. Q235 round bar A36/ST37-2/Q195/C45/S355/SCM440/42CrMo4 round bar diameter5.5-250 Q235 round bar 1.round ... Standard : GB Standard / ASTM Standard / DIN Standard / JIS Standard round bar2.round bar available Grade : A36, ST37-2, Q195, Q235, C45, S355 ... , SCM440, 42CrMo4, round bar3.round bar diameter : 5.5 mm to 250 mm 4 ...