We also offer the same in different grades and specifications such as Carbon Steel Round Bars, Carbon Steel Round Bars, Carbon Steel Round Bars, Carbon Steel Round Bars, Carbon Steel Round Bars. To change the properties of Carbon Steel Square Bars is by adding alloying elements other than carbon that produce characteristics not achievable in plain carbon steel. Each of the approximately 20 elements used for Carbon Steel Flat Bars has a distinct influence on microstructure and on the temperature, holding time, and cooling rates at which microstructures change.