What is the difference between round steel and other steel bars?

Round steel refers to a solid long steel bar with a circular cross section. Its specifications are expressed in millimeters of diameter. Round steel is divided into three types: hot-rolled, forged and cold-drawn. The specifications of hot-rolled round steel are 5.5-250 mm, among which: 5.5-25 mm small round steel is mostly supplied in bundles of straight bars and is often used as steel bars. So, what are the differences between round steel and other steel bars?
1 Appearance
Round steel has a smooth round appearance, no patterns or ribs, while other steel bars have patterns or ribs on the surface, which results in a small bond between round steel and concrete, while other steel bars have a large bond between them.
2 Composition
Round steel (first-grade steel) belongs to ordinary low-carbon steel, while other steel bars are mostly alloy steel.
3 Strength
Round steel has low strength, while other steel bars have high strength, that is, compared with other steel bars of the same diameter, round steel can withstand less tensile force than other steel bars, but round steel has stronger plasticity than other steel bars, that is, round steel has a larger deformation before being broken, while other steel bars have much smaller deformation before being broken.