Factory state: annealing, the maximum hardness 235HB Steel properties: high temperature resistance, thermal strength. Polishing and cutting easy, surface nitriding, spark machining Uses: suitable for a variety of hot applications such as die casting, heat or metal alloy extrusion die, Nozzle, fire extinguishers, heat scissors, plastic mold, the mold can be the first fishes Lo. Forged: 1100 ℃ to 900 ℃ began forging with the furnace melted down cooled. Anneal: 750 ℃ ??-800 ℃ with the furnace cooling after holding up to the hardness 235HB (highest). Stress relief :600-650 ℃ heat 1-2 hours with the slow cooling furnace. Quenching: from 1020-1080 ℃ oil or air cooling, tempering must be immediately reduced to 60-80 ℃. Tempering: Tempering the first of about 500 ℃ to obtain the maximum hardness of the secondary hardening; the second time is equal to more than 500 ℃ tempered to achieve the required hardness; the third time Times the temperature slightly lower than the temperature of the former fire (about 30 ℃). Dimensions: round (MM) 130.0 150.0 20.5 25.5 30.8 35.8 40.8 45.8 50.8 55.8 60. 866.0 71.0 76.0 81.0 86.0 91.0 96.0 101.5 106.5 116.5 121.5 126.5 131.5 141.5 151.5 162.0 182.0 202.0 222.0 252.5 272.5 321.5 358.0 232.0 242.0 Flat (MM) 150X25-28-32-35-43-54-65-80 155X25-32-43 165X25-28-32-35-43-54-65-80 180X25-28-32-35-43-54-65-80 205X25-28-32-35-43-54-65-80-90-105 255X25-28-32-35-43-54-65-80-90-105 305X25-28-32-43-54-65-80-90-105-130 410X105-130-155 510X210-260 610X130-155-210