1 Overview M310 high-quality corrosion-resistant mirror mold steel, the furnace re-refining method (ESR) refining, steel clean uniform, well-structured, high density, excellent polishing performance, with anti-corrosion function, after hardening up to 57HRC. All general chemicals with corrosion resistance, suitable for the manufacture of transparent plastic mold PVC plastic mold, mold on the optics, especially for the high demands of the particular cassette and tape mold. Factory state: soft melted down to 225HB (highest) Steel Characteristics: acid resistance of high chromium stainless steel, hardened die after a very resistant, excellent cutting and polishing performance. The main components of C 2 carbon Cr chromium Mn Mn Mo Si silicon molybdenum vanadium V 0.41 14.30 0.45 0.60 0.20 0.70 3 annealing quenching and tempering heat treatment process project processing temperature / ℃ cold cut 800-850 ℃ furnace cooling 1000-1050 ℃ oil cooling 200-250 ℃ into the furnace Forged: 1050 ℃ to 850 ℃ began forging melted slowly cooled. Annealing: 800-850 ℃ heat after furnace cooling air-cooled 600 ℃, hardness up to 225HB. Stress relief: after the oven is protected by 650 ℃ hot gases through heat for 1-2 hours. Quenching: 1000-1050 ℃ after heat oil or air quenching and tempering immediate cooling to 50-70 ℃. (Hardness up to 55-57HRC) Tempering: immediately after quenching into the furnace 200-250 ℃ tempered, tempering time at least 2-2.5 hours. 4 Application Suitable for all acidity of plastic molds, such as PVC products, transparent plastic mold manufacturing, optical products.