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Materials
We can supply a complete range of conical twin screws. Based on our extensive experience, we can recommend the appropriate steel grade and surface treatment to minimize wear. According to the customer’s needs, we can propose nitriding steel, which can eventually be welded to tool steel or other materials.
OEM’s specifications
We deliver screws according to OEM specifications. The screws are the heart of the process and determines the productivity and the quality of the product.
Profiles
Maxi Melt can make screws with all kinds of profiles which are in use with the customer.
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 kinds of materials to be selected from case to case, with a high surface finish suitable to withstand wear and or corrosion conditions
Materials for plasticizing screws
Choosing the right screw material is important to have the right performance in order to reduce wear and corrosion problems
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DIN standard
Base Material
Treatment
Abrasive Wear Resistance
Corrosive Wear Resistance
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MM31Quenced and TemperedNitriding++
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MM41Quenced and TemperedNitriding++
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MM34Quenced and TemperedNitriding++
Welding materials for the screw flights
For extra protection, we use high tensile strength nitrided materials with welded flight tips. There are several material options. This is done to create wear/corrosion protection or improve friction/lubrication
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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 1CobaltC - Cr - W52 - 57++++++
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Stellite 12CobaltC - Cr - W44 - 48+++++
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Colmonoy 56NickelC - Si - Cr - B - Fe52 - 56+++++++
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Colmonoy 83NickelTungsten carbide56 - 60 [a]+++++++++
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CastoTIG 5IronCr - V58 - 62++++++
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TypeStellite 1
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Base AlloyCobalt
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Alloy componentsC - Cr - W
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Hardness [HRC]52 - 57
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Abrasion resistance+++
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Corrosion resistance+++
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TypeStellite 12
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Base AlloyCobalt
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Alloy componentsC - Cr - W
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Hardness [HRC]44 - 48
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Abrasion resistance++
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Corrosion resistance+++
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TypeColmonoy 56
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Base AlloyNickel
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Alloy componentsC - Si - Cr - B - Fe
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Hardness [HRC]52 - 56
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Abrasion resistance+++
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Corrosion resistance++++
Welding materials for the screw flights
For larger screw sizes, we often use nitrided materials, with the flight tips welded from different materials. This creates wear/corrosion protection or improves friction/lubrication.
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MM CODE
FLIGHT ARMORING
TECHNOLOGY
ABRASIVE WEAR RESISTANCE
CORROSIVE WEAR RESISTANCE
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MM120Cobalt Base AlloyPTA++++++
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MM50Iron Base AlloyTIG++++++
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MM560Nickel Base AlloyPTA++++++++
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MM570Nickel Base AlloyPTA+++++++++++
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MM830Nickel Base AlloyPTA++++++++++
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MM4900MolybdenumHVOF+++++++++
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MM6000Tungsten CarbideHVOF++++++++++++
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MM CODEMM120
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FLIGHT ARMORINGCobalt Base Alloy
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TECHNOLOGYPTA
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ABRASIVE WEAR RESISTANCE+++
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CORROSIVE WEAR RESISTANCE+++
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MM CODEMM50
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FLIGHT ARMORINGIron Base Alloy
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TECHNOLOGYTIG
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ABRASIVE WEAR RESISTANCE++++
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CORROSIVE WEAR RESISTANCE++
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MM CODEMM560
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FLIGHT ARMORINGNickel Base Alloy
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TECHNOLOGYPTA
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ABRASIVE WEAR RESISTANCE++++
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CORROSIVE WEAR RESISTANCE++++
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MM CODEMM570
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FLIGHT ARMORINGNickel Base Alloy
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TECHNOLOGYPTA
-
ABRASIVE WEAR RESISTANCE++++++
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CORROSIVE WEAR RESISTANCE+++++
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MM CODEMM830
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FLIGHT ARMORINGNickel Base Alloy
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TECHNOLOGYPTA
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ABRASIVE WEAR RESISTANCE+++++
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CORROSIVE WEAR RESISTANCE+++++
Voorbeeld schroeven
Based on all available material and treatment options, we selected examples of screw configurations versus polymer processing.
Discover more products
Other products for injection and extrusion can be found below by clicking on the pictures for more information.
