Factory state: soft melted down to 225HB (highest) Steel properties: the acid resistance of a high chromium stainless steel, highly wear-resistant hardened after the mold, cutting and polishing excellent performance. Uses: Suitable for all acid of the plastic mold, such as PVC products, manufacture of transparent plastic mold, such as optical products. Forged: 1050 ℃ to 850 ℃ began forging melted down slow cooling. Thermal annealing :800-850 ℃ 600 ℃ after the furnace cooling air-cooled, hardness up to 225HB. Stress relief: with a protective gas of the furnace 650 ℃ and heat through 1-2 hours after the insulation. Quenching :1000-1050 ℃ heat or air-cooled then quenched in oil and tempering immediately cooled to 50-70 ℃. (Hardness up to 55-57HRC) Tempering: Quenching 200-250 ℃ into the furnace immediately after the tempering, annealing time at least 2-2.5 hours. Dimensions: round (MM) 20.5 25.8 28.8 35.8 40.8 45.8 50.8 55.8 60.8 66.0 71.0 76.0 86.0 91.0 101.5 116.5 131.5 162.0 182.0 202.0 230.0 262.5 Flat (MM) 97X20-25-32-35-40-45-50 105X20-25-32-35-40-45-50 130X20-25-32-35-40-45-50 165X20-25-32-35-40-45-50-60-65-76 205X20-25-32-35-40-45-50-60-65-76-90-105 255X20-25-32-35-40-45-50-60-65-76-90-105 305X20-25-32-35-40-45-50-60-65-76-90-105 360X32-40-50-65-70-80-90-105 410X50-65-76-90-105 510X65-76-90-105 610X65-76-105-130-155-210-260 1,000 X20-25-28.5-32-35-40-45-50-60-70-80-90