w302 Introduction
Thermal strength. Polishing and cutting easy, surface nitriding, spark machining. Uses: suitable for a variety of heat applications such as die-casting mold, heat or metal alloy extrusion die, nozzle, fire extinguishers, hot scissors, plastic mold, and so on. Factory state: soft melted down to HB235 (highest) features Applications: steel clean uniform, well-structured, with a horizontal forging 3000-6000 tons of pressure, high impact strength, ultrasonic testing, high material utilization, and reduce processing costs, the best of the red hot hardness, high strength and toughness. can be prepared zinc \ Al \ lead \ tin alloy or copper alloy die-casting mold, squirt nozzle, squeeze the axis, etc., used as a hammer or hot red hot mold, the hardened after plastic mold can be used for permanent production
Heat treatment process
[1] forging: 1100 ℃ to 900 ℃ began forging furnace cooled with recycled :750-800 ℃ thermal annealing furnace after cooling, up to hardness of 235HB (highest). Quenching: the 1020-1080 ℃ oil or air cooling, tempering must be approaching 60-80 ℃ immediately. Tempering: The first fire of about 500 ℃ in order to obtain maximum hardness of the second hardening; second tempering is equal to 500 ℃ in order to achieve the required hardness; third tempering temperature is slightly lower than the former temperature (about 30 ℃).
w302 chemical composition
[2] C C 0.40, Cr Cr 5.00, Mn Mn 0.40, Mo-Mo 1.30, V V 1.10, Si Silicon 1.00