C45 Steel Round Bar | Machined Roundbar Unalloyed medium carbon steel, often known as general carbon engineering steel, is steel C45 round bar. The medium strength steel C45 has outstanding tensile characteristics as well as good machinability. With a typical tensile strength range of 570 – 700 Mpa and Brinell hardness range of 170 – 210 in either state, C45…