Cast steel ball: mainly made of scrap iron and steel, after the material is melted, it is cast and shaped with a model, and cooled with an 8.0-size mold. Forged steel ball is a specific round steel produced by steel mills, which is heated to a certain temperature by modern electric furnace, forged by air hammer and other equipment, and hardened by quenching and tempering.
Round steel refers to solid strip steel with circular cross section.