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    material is plastic deformation resistance of small after annealing; large and complex molds  requires that
    material has good welding process in order to be able to easily repair local damage and so on. The cost of
    plastic mold is  high, generally is about 75% of the total cost, while the cost of materials and heat
    treatment is about 10% each. Thus, the more important  plastic molds, under the premise of good
    performance should   choose easily manufacturing materials, and the price factor is of secondary fact.  
    5 The choice of plastic mold materials
      5.1 Cold forming plastic mold material selection
    For this type of mold we usually select low carbon steel (carburizing steel) and strive to choice low-
    carbon or very low carbon steel such as DTl, 20,20 Cr, 12 Cr Ni3 A, 40Cr and so on.  
    For the injection, extrusion forming molds that have high wear-resistant surface and heart department
    toughness good and less complex in shape ,we can use carburizing steel to cold forming mold. we also
    use 10,20,12 CrNi3A, 20Cr,20CrMhmo and 20Cr2Ni4A,etc.  
      5.2 Cutting molding plastic mold material selection  Mailly use quenched and tempered steel after quenching and tempering treatment processing.  
    1)Small production, or small molds can use quenched and tempered carbon steel, such as 40,50,55, etc.  
    2)large quantities or large, complex molds can use alloy quenched and tempered steel, such as 3Cr2Mo,
    4Cr3MoSiV, 5CrNiMo, 5CrMnMo, 4Cr5MoSiV, 4Cr5MoSiVl ,etc.  
    3)High-precision,large quantities injection molding, we choice pre-hardened steel ,such as
    4Cr5W2SiVl, 8Cr2MnWMoV. Pre-hardened hardness is about 42~48HRC. Sometimes we choice pre-
    hardened cutting steel.  
    Working conditions  Recommended steel
    small plastic mold with small production  and less
    precision products
    45、55 or 10 Carburizing steels、20 Carburizing
    steels
    withstand a larger dynamic load, producing larger
    quantities, more serious wear  
    12CrNi3A、20Cr、20CrMnMo、20Cr2Ni4A
    Carburizing steels
    Large, complex, large volume, injection molding or
    extrusion dies
    3Cr2MO、  4Cr3M03SiV、  5CrNiMO、
    5CrMnMO、  4Cr5MoSiV、4Cr5MOSiVl
    Thermoset molding requiring high wear, high
    strength
    9Mn2V、7CrMn2WMO、CrWMn、MnCrWV、
    GCrl5、5Cr2MnWMOVS、Cr2Mn2SiWMoV、
    Cr6WY、Crl2MOV、Crl2
    Corrosion resistance and high-precision plastic
    mold
    4Crl3、9Crl8、Crl8MoV、Crl4Mo、Crl4M04V
    Complex, sophisticated, high wear-resistant plastic
    mold
    25CrNi3MoAl“Ni(250)、18Ni(300)、18Ni(350)`
    6 Plastic mold heat treatment
    Plastic mold should have a moderate hardness and good toughness, different types of mold requires
    different hardness, several types of plastic mold steel and hardness of the requirements are show below.
    As thermosetting plastic mold is heated and works under pressure in a long time, through heat treatment,
    has a high enough resistance to pile collapse capacity.  
    The work hardness of different types of plastic mold
    Mould type  Die steel Work hardness  Description
    plastic with a simple
    shape and inorganic filler
    Crl2Mo or 5CrW2Si
    Carburizing steels
    56~60HRC Requirs wearability  under
    high pressure
    small plastic mold with a
    simple shape and a long
    life
    alloy tool steel such
    as 9Mn2V、Cr12 etc
    54~58HRC high wearability and good
    strength and toughness
    high precise plastic mold
    with a  complex shape
    and a micro-deformation
    quenching
    T7A、T10A 45~50HRC Parts for easily broken (eg,
    core)
    Soft injection plastic
    mold
    Carbon tool steel、
    3Cr2Mo
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