M300 Pre-hard anti-acid mold steel M300 die steel performance M300 M300 die steel mold steel uses M300 the die steel hardness and chemical ingredients M300 mold steel heat treatment process M300 die steel Specification M300 die steel Austrian Bluff brand quality steel, carbon content higher martensitic chromium steel, after heat treatment, hard hardenability degree of uniformity, 31-35HRC mold never deformed due to the high chromium content (16%) and molybdenum, therefore steel has good corrosion resistance and abrasion resistance, against the general chemical erosion performance, especially PVC products more effectively, and easily reached specular effects. The the M300 steel types: prehardened high chromium corrosion resistant plastic mold steels characteristics: the high chromium turned prehardened acid the mirror Steel, excellent wear resistance, corrosion resistance and mirror factory state :29-34 HRC Remarks: This steel for the same series of top-level product, the overall performance is good, the high demands of anti-acid, the mirror molding line taken into account. factory condition: pre-hard-to 1000-1100N / mm 2 (31-35HRC) M300 mold steel use in contact with the chemical resistance, transparent plastic, camera lenses and other types of plastic mold steel more impervious effect, easy to reach the required highly polished and mirror polished, suitable for all chemicals in contact with the plastic mold is the best champion of similar steel products. transparent plastic products, articles of mold or erosion. M300 die steel chemical composition C: 0.38 of Cr: 16.00 Mn: 0.65 Ni: 0.80 Mo: 1.00 Si: 0.40 M300 mold steel heat treatment process: 1. Wrought: 1050 ℃ began forging to 850 ℃ melted down and slow cooling with the furnace. 2 annealing :800-850 ℃ air cooling or furnace cooling to 600 ° C, hardness up to 285HB. 3. Quenching: from of 1000-1050 ℃ oil or air cooling. 4. Tempering :600-700 ℃ 170-210 ℃. Hardened immediately tempered after the time at least 2 to 2.5 hours. 5. Welding: welding but as much as possible to avoid.