Tool Steel Screws Although some manufacturers produce screws made from conventional tool steels, such as D-2 or H-13, most new tool steel screws are made from tool steels produced from a Particle Metallurgy Process (PM). Rather than making the tool steel from poured ingots and rolled, the PM process utilizes atomization and isostatic compression to make the steel. Prealloyed molten steel is atomized into a spray of micro ingots (powder cons ... Continue