... order&customize 3Fast delivery time Structural carbon steel hot rolled carbon round steel(Q235 Q235B Q345 Q345B ASTM A36 SS400 S275JR S235JR SS355 ... #,20#,45#,Q195,Q235B ,SS400,ASTM A36,S235JR,St37-2,Q345B,S355JR,etc.ApplicationA) General service industries (petroleum, food, chemical, paper ...