40Mn Y15 Steel Round Bar

Round steel specifications are expressed in millimeters of diameter. Round steel is divided into hot rolled, forged and cold drawn three kinds. Hot rolled round steel is 5.5-250 mm in size. Among them, 5.5-25 mm small round steel is mostly supplied in straight strips in bundles, commonly used as steel bars, bolts and various mechanical parts; Round steel larger than 25 mm, mainly used for the manufacture of mechanical parts or seamless steel blanks. The difference between round steel and other steel bars: 1, the appearance is not the same, the round steel appearance is round, no lines and no ribs, and the surface appearance of other steel bars is engraved or ribbed, so that the bond between round steel and concrete is small, and the bond between other steel bars and concrete is large. 2, the composition is not the same, round steel (first grade steel) belongs to ordinary low carbon steel, other steel bars are mostly alloy steel. 3, the strength is not the same, the strength of round…