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Materials
We can supply a complete range of parallel 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.
Screws according to OEM’s specifications
We deliver screws according to OEM’s specification.The screws are the heart of the process and determines the the productivity and the quality of the product.
Profiles
Maxi Melt can make screws with all kind of profiles which are in use with the customer.
The advantage of our screws.
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.
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
Material
Type steel
Treatment
Hardness
Abrasion resistance
(x good) to (xxxxx excellent)Corrosion resistance
(x good) to (xxxxx excellent) -
1.850941CrAIMo7Nitriding steelNitrided>850 HV1++
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1.851931CrMoV9Nitriding steelNitrided>700 HV1++
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1.855034CrAINi7Nitriding steelNitrided>850 HV1++
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Din standard1.8509
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Material41CrAIMo7
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Type steelNitriding steel
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TreatmentNitrided
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Hardness>850 HV1
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Abrasion resistance+
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Corrosion resistance+
Welding materials for the screw flights
For extra protection we use high tensile strength nitrided materials with welded flight tips. There are several material materials options. This is done to create wear/corrosion protecting 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++++
Example screws
Based on all material and treatment options we selected some examples screw configuration versus processing.
Discover more products
Other products for injection and extrusion can be found below by clicking on the pictures more information is shown.
