HRB500, high yield strength, low carbon, use to build big building. standardchemical character,100%σs(orσp0.2)σbδ5Diameterbending test diameterMPAMPa%CSiMnPSCeqovermmHRB3350.250.81.60.0450.0450.52335490166-253a28-504aHRB4000.250.81.60.0450.0450.54400570146-254a28-505aHRB5000.250.81.60.0450.0450.55500630126-256a28-507a deformed steel bar