The manufacturing process of the D2 hot rolled alloy steel round bar begins with the selection of high-quality raw materials. The steel is then melted in an electric arc furnace and is poured into a continuous casting machine to form ingots. The ingots are then heated and rolled into blooms, billets or slabs. After that, the slabs are reheated and hot rolled into D2 hot-rolled alloy steel round bars using a series of rolling mills. The final product is cooled and then inspected for quality and consistency. The D2 steel is typically heat-treated to achieve its final hardness and other mechanical properties, which is typically done by oil quenching and air cooling, resulting in a Rockwell hardness of 60-62 HRC. This process is also called as hot working process.