... . Dia: 10-50mm 3. Hot rolled, black surface BS4449 deformed steel bars quality: AST615 BS4449 B500B HRB300 HRB400 HRB500 and so ... ,C22--C80, S235JR, S345JR, SS400H beam100*100 to 900*300mmQ235B,Q345B,SS400,A36,A572,A992,Gr50,S235JRG2,S235JR,S275JR or JO ...