Shop Carbon Steel Bar Stock with Xometry Supplies. Through a strategic partnership with leading metals service center, Fast Metals, we are now able to provide standard sizes of Carbon Steel Bar Stock and offer free ground shipping ! Carbon Steel is used for general purpose manufacturing projects. Carbon Steel features excellent weldability, machining, drilling, punching, tapping and grinding. Carbon Steel has a lower melting point and better heat distribution and malleability than other Steel Alloys.