How about the difference between round steel and shaped steel? Where are they mainly used?
Section steel is a general term, round steel is a kind of section steel, mainly used in building structure, mostly for engineering steel.
Low carbon steel structure steel Q235, Q345 rolled out section is I-shaped, C shape, L shape, flat strip, plate shape... Etc.... Called into "type", as used in steel structure component.
Low carbon steel Q235 steel hot rolled into a round, mainly used in concrete. Medium and high carbon tool steels are wound into large diameter round bars and are used in the machinery industry for cutting into components.
