M310 high-quality corrosion-resistant mirror surface die steel, refined by electric furnace smelting method (ESR) steel clean uniform, well-structured, high-density, polished performance, with anti-corrosion and hardened up to 57HRC. All general chemicals, corrosion resistance, suitable for the manufacture of transparent plastic mold PVC plastic mold, mold, on the optical and in particular for the high requirements of cassettes and tapes mold.