Highly wear-resistant screws will not just extend the service life of your plant. They will also improve the quality of your products. We can offer you all kinds of screws for extrusion and injection molding: 3-zone screws, multiple thread screws, barrier screws, vented screws, or highly complex twin screws.
The flight is the area of the screw that is exposed to the highest loads. Armouring this area with alloys improves its wear and corrosion resistance. The armouring alloy is applied by using plasma powder welding. The armouring layer has a thickness of 1.5 to 2 mm. The entire screw surface is ion nitrided in order to protect the screw root and the flights. The surfaces of the screw root and the flights can also be hardchrome plated.
Dimensions
Screw diameter 40 mm - 350 mm
Length max. 9000 mm
Versions
Armoured blank pre-ground to nominal size +0.3 mm
Screws finished according to drawing
Through-hardened screws are available as finished components according to drawing in 12379 quality or in a PM-HIP version.
Dimensions
Screw diameter: 14 mm - 70 mm
Length: max. 2500 mm
Highest wear protection with good corrosion resistance
RC3
Hardness at room temperature: min. 56 HRC
Main alloy components: V, Cr
Microstructure: Martensitic iron-based alloy with primary vanadium monocarbide (VC) precipitate and Cr7C3 chromium carbides
RC5
Hardness at room temperature: min. 57 HRC
Main alloy components: V, Cr, Ni
Microstructure: Martensitic iron-based alloy with primary fine vanadium monocarbide (VC) precipitate as well as chromium carbides (Cr7Cr 3).
Maximum hot-hardness with maximum adhesive wear resistance
RP50
Hardness at room temperature: min. 49 HRC
Main alloy components: Mo, Cr, B
Microstructure: Nickel cobalt base alloy with primary solidified Ni2B nickel borides and Mo-Si-C Laves phases. Also eutectic solidified Cr7C3 chromium carbide as well as Ni3B nickel borides.
Optimum wear and corrosion protection at high temperatures
RS12
Hardness at room temperature: min. 45 HRC
Main alloy components: Cr, W
Microstructure: Dendritic cobalt base matrix eutectically precipitated mixed tungsten and chromium carbides in the spaces between dendrites
