provide qualified galvanized steel pipe MaterialQ195-Q345, GR.BSpecification(SHS)Square hollow section pipe(RHS) rectangular hollow section pipe10*10-- 600* ... ,aviation ,boiler heat, exchanger,shipbuilding,construction,etc addition: 1.Special design available accorting to requirement. 2.Anti-corrosion and high-temperature ... your own request to the supplier. Q435B STRAIGHT SEAM STEEL SQUARE PIPE