Die-casting mold steel main chemical component analysis (%) (for reference only) W302 C hot carbon Si Si Cr Mn Mn Mo chromium molybdenum vanadium V 0.40 1.00 5.00 0.40 1.30 1.10 standard of comparison: AI SI H13 DIN 1.2344 factory condition and hardness: annealed The maximum hardness 235HB Forged: 1100 ℃ to 900 ℃ began forging furnace cooling recycled. Annealing: 750 ℃ ??-800 ℃ after holding furnace cooling, the hardness of up to 235HB (highest). Stress relief: 600-650 ℃ holding for 1-2 hours after slow cooling in the furnace. Quenching: 1020-1080 ℃, oil cooling; or 500-550 ℃ bath quenching, heat for 15-30 minutes, air-cooled quenching hardness: oil cooler, HRC52-56, bath, HRC50-54 tempering: first back fire about 500 ℃ to obtain the maximum hardness secondary hardening; the second is equal to greater than 500 ℃ tempering to achieve the desired hardness; third fire back once the temperature is slightly lower than the former temperature (about 30 ℃). Steel properties: structure refinement thermal cracking, high thermal strength and impact strength, high temperature wear resistance, can be used for surface nitriding, galvanic corrosion, high polished, easy to cut, you can water-cooled. Main purpose: for a variety of hot work purposes, such as die casting, heat or metal alloy extrusion die, Nozzle, fire extinguishers, heat scissors, plastic mold, the mold can screw the slightest head.