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[ 01 ]
Materials

We can supply a complete range of conical twin screws. Based on our large experience we can recommend the proper type of steel and surface treatment to minimize wear. According to customer’s needs we can propose nitriding steel eventuallly welded with tool steel or other materials.

[ 02 ]
OEM’s specifications

We deliver screws according to OEM’s specification.The screwsare the heart of the process and determines the the productivity and the quality of the product.

[ 03 ]
Profiles

Maxi Melt can make screws with all kind of profiles which are in use with the customer.

[ 04 ]
Het voordeel van onze schroeven

Up to date machinery and CAD CAM facilities make it possible to manufacture high quality complex products with tight tolerances from different kind of materials to be selected from case to case with a high surface finish suitable to withstand wear and or corrosion conditions

High tensile strengt material is used to withstand the high proces tork and requiremenst,

Improved durability to weld the flighttops with high abrasive resistant material.

High surface finish to reduce friction.

Materials for plasticizing screws

Choosing the right screw material is important to have the right performance in order to reduce wear and corrosion problems

  • DIN standard
    Material
    Type steel
    Treatment
    Hardness
    Abrasion resistance
    (x good) to (xxxxx excellent)
    Corrosion resistance
    (x good) to (xxxxx excellent)
  • 1.8509
    41CrAIMo7
    Nitriding steel
    Nitrided
    >850 HV1
    +
    +
  • 1.8519
    31CrMoV9
    Nitrided steel
    Nitrided
    >700 HV1
    +
    +
  • 1.8550
    34CrAINi7
    Nitriding steel
    Nitrided
    >850 HV1
    +
    +
1.8509
  • Din standard
    1.8509
  • Material
    41CrAIMo7
  • Type steel
    Nitriding steel
  • Treatment
    Nitrided
  • Hardness
    >850 HV1
  • Abrasion resistance
    +
  • Corrosion resistance
    +
1.8519
  • Din standard
    1.8519
  • Material
    31CrMoV9
  • Type steel
    Nitrided steel
  • Treatment
    Nitrided
  • Hardness
    >700 HV1
  • Abrasion resistance
    +
  • Corrosion resistance
    +
1.8550
  • Din standard
    1.8550
  • Material
    34CrAINi7
  • Type steel
    Nitriding steel
  • Treatment
    Nitrided
  • Hardness
    >850 HV1
  • Abrasion resistance
    +
  • Corrosion resistance
    +

Welding materials for the screw flights

For extra protection we use high tensile strenght nitrided materials with welded flighttips. There are several material materials options. This is done to create wear/corrosion protecting or improve friction/lubrication

  • Type
    Base Alloy
    Alloy components
    Hardness [HRC]
    (a) Hardness of matrix, tungsten carbides have a hardness of 89 HRC.
    Abrasion resistance
    (x good) to (xxxxx excellent)
    Corrosion resistance
    (x good) to (xxxxx excellent)
  • Stellite 1
    Cobalt
    C - Cr - W
    52 - 57
    +++
    +++
  • Stellite 12
    Cobalt
    C - Cr - W
    44 - 48
    ++
    +++
  • Colmonoy 56
    Nickel
    C - Si - Cr - B - Fe
    52 - 56
    +++
    ++++
  • Colmonoy 83
    Nickel
    Tungsten carbide
    56 - 60 [a]
    +++++
    ++++
  • CastoTIG 5
    Iron
    Cr - V
    58 - 62
    ++++
    ++
Stellite 1
  • Type
    Stellite 1
  • Base Alloy
    Cobalt
  • Alloy components
    C - Cr - W
  • Hardness [HRC]
    52 - 57
  • Abrasion resistance
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
Stellite 12
  • Type
    Stellite 12
  • Base Alloy
    Cobalt
  • Alloy components
    C - Cr - W
  • Hardness [HRC]
    44 - 48
  • Abrasion resistance
    +
    +
  • Corrosion resistance
    +
    +
    +
Colmonoy 56
  • Type
    Colmonoy 56
  • Base Alloy
    Nickel
  • Alloy components
    C - Si - Cr - B - Fe
  • Hardness [HRC]
    52 - 56
  • Abrasion resistance
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
    +
Colmonoy 83
  • Type
    Colmonoy 83
  • Base Alloy
    Nickel
  • Alloy components
    Tungsten carbide
  • Hardness [HRC]
    56 - 60 [a]
  • Abrasion resistance
    +
    +
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
    +
CastoTIG 5
  • Type
    CastoTIG 5
  • Base Alloy
    Iron
  • Alloy components
    Cr - V
  • Hardness [HRC]
    58 - 62
  • Abrasion resistance
    +
    +
    +
    +
  • Corrosion resistance
    +
    +

Voorbeeld schroeven

Based on all material and treatment options we selected some examples screw configuration versus polymer processing.

Conical twin screws 1
Conical twin screws 2
Conical twin screws 3
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