How to heat treatment of P20 plastic die steel

    Improve P20 plastic die steel hardness treatment:
    In order to improve die life up to 80 million times or more, can quenching and tempering way to achieve the implementation of pre-hardened steel. Quenching preheated at 500-600 ℃ 2-4 hours and then at 850-880 ℃ holding a certain time (for at least 2 hours), into the oil cooled to 50-100 ℃ oil cooled, quenched hardness of up to 50 -52HRC. Immediately carried out 200 ℃ low-temperature tempering treatment in order to prevent cracking. After tempering, the hardness can be maintained over 48HRC.
    P20 plastic die steel nitriding treatment:
    Nitrided surface tissue can be obtained with high hardness, surface hardness after nitriding reached 650-700HV (57-60HRC) die life can reach more than one million times, the nitride layer has a dense, smooth characteristics. Improve the mold release properties, P20 steel is improved in the moist air and alkali corrosion resistance.
(Nitriding treatment: refers to a certain temperature under nitrogen atoms penetrate certain media manipulation chemical heat treatment process of the workpiece surface.
After nitriding treatment products with excellent wear resistance, fatigue resistance, corrosion resistance and high temperature properties. Common liquid nitriding, gas nitriding, ion nitriding. Nitriding treatment, also known as diffusion nitriding. Gas nitriding by the Germans Fry in 1923 for the first time to research and development and industrialization. Nitrided article has excellent wear resistance, fatigue resistance, corrosion resistance and high temperature, gradually expanding its scope of application.)

The above article from Songshunsteel official website (http://www.songshunsteel.com/)
The original address: http://www.songshunsteel.com/news_show_27_22_36.html, reproduced please specify
songshunblog