Hitachi Metals HPM38 (SUS420J2 improvement) is 13CR with MO Department of stainless steel, specially manufactured good dissolving corrosion resistance, therefore, best suited to the requirements of high hardness and high corrosion resistance requirements mirror the plastic mold, and, HPM38 heat a very small change size, suitable for precision heat treatment. HPM38 Hitachi Metals plastic mold steel, super mirror stainless steel, excellent mirror-polished, corrosion resistance and wear resistance, heat deformation, corrosion-resistant mirror finish steel, with Hardness 50-55HRC, after a special melting steel. Delivery Status: Pre-hardened to 29-33HRC hardness after quenching fire up to 50-55HRC Steel properties: HPM38 13 chrome molybdenum steel, through a special solution made of, so the most suitable for high hardness and corrosion-resistant mirror requirements of high plastic mold. And it is heat deformation small, so it is suitable for precision heat treatment. In addition, the erosion of good, very favorable for mold maintenance. Mirror processing is very good, with more than SUS420J2 better abrasion resistance, no chrome. Smaller heat deformity, the most suitable for precision molding. Delivery of pre-hardened state, so you can immediately use. Uses: used for corrosion and wear-resistant tool steel mirror finish, transparent plastic precision mold products, lenses, cosmetic boxes and other flame-retardant resin mold, home appliances, office equipment, communications equipment, parts, electroless products: curtains food containers, medical equipment. Heat treatment: quenching tempering 200-500 1000-1050 air-cooled air-cooled factory Status: Pre-hardened to HB 300-330 chemical composition (%): C: 1.5 Si: ≤ 0.4 Mn: ≤ 0.6 Cr: 12.0 Mo: 1.0 V: 0.3