Steel Round BarChina Material SAE4340 Per ASTM A322 Rectangular Bar Hot Rolled Annealed 228hb Surface Free of Scale Tolerances 1mm, Find details about China Material SAE4340, ASTM A322 Rectangular Bar from Material SAE4340 Per ASTM A322 Rectangular Bar Hot Rolled Annealed 228hb Surface Free of Scale Tolerances 1mm