... hot rolled carbon round steel(Q235 Q235B Q345 Q345B ASTM A36 SS400 S275JR S235JR SS355.....manufacture)specificationOuter ... -2008 Material10#,20#,45#,Q195,Q235B ,SS400,ASTM A36,S235JR,St37-2,Q345B,S355JR,etc.ApplicationA ... fertilizer, Fabric, aviation and nuclear)B) Fluid, gas and oil transportC) Pressure and heat transmissionD) Construction and ornamentE) Boiler heat exchangersTestflaw ...