Bar 
 Bar is a circular cross-section of solid steel bar. Its specifications to a few millimeters in diameter, such as "50" means that the diameter of 50 mm round steel. 
 Bar is a circular cross-section of solid steel bar. Its specifications to a few millimeters in diameter, such as "50" means that the diameter of 50 mm round steel. Divided into hot-rolled bar, forging and cold drawing three. Hot rolled round steel specifications 5.5-250 mm. :5.5-25 mm, of which a small bar mostly straight bundles supply, commonly used for steel bars, bolts and various machine parts; greater than 25 mm, round steel, mainly for the manufacture of mechanical parts or for seamless round billet the difference between steel and other steel: a different shape, round shape light circle, no pattern no rib, the other a sculptured steel surface or a ribbed appearance. This round steel and concrete to create the cohesive force is small, while the other bond strength of reinforced concrete large. 2 different components, bar (a steel) are common low carbon steel, alloy steel, other steel mostly. 3 strength is not the same. bar low intensity, other high strength steel , that is, the same bar diameter compared with other steel, round steel can withstand tensile steel than other small, but round steel reinforced plastic stronger than the other, that bar is pulled off in large deformation before , while the other pulled off before the bar in the deformation is much smaller.