Materials

Wear and corrosion protection

Screw elements, bushing and barrel with a twin-screw extruder are subjected to substantial process-dependent effects.

Through the most varied materials and coatings, we can adapt them optimally to the stresses of your process.

Wear and corrosion protection for screw elements

Type of screw stress KMB
material
Material description/wear protection
Hardness in HRC
Resistance against
Design
wear corrosion
Standard A Hardened and tempered nitriding steel with nitrided layer 900 ±50
HV
•• Solid
Wear Z10 Wear resistant, through-hardened PM-special tool steel with ductile core 62 -3 ••• •• HIP composite material
Corrosion Z9 Corrosion resistant, through-hardened PM-special tool steel with ductile core 57 -3 •• ••• HIP composite material
High wear Z44 Highly wear resistant, through-hardened PM-special tool steel with ductile core 63 -2 ••••• HIP composite material
High corrosion PX4 Highly corrosion resistant Fe-based material with hard faced screw flights on Co-basis 49 -6 •• ••••• Flights with welded-on layer
High wear and high corrosion Z55 Wear and corrosion resistant, through-hardened PM-special tool steel with ductile core 60 -3 ••• •••• HIP composite material
Wear during pressure build-up J2 Fe-based material with hard faced screw flights on Ni-basis 57 -4 •••• Flights with welded-on layer
Resistance against stress:
• Low •• Low ••• Middle •••• High ••••• Very high
Special materials and designs available on request

 

Wear and corrosion protection for housing and barrel

Type of barrel stress KMB material Material description/
wear protection
Hardness in HRC Resistance against Design
wear corrosion
Standard AF Hardened and tempered nitriding steel with nitrided layer 800 ±50 HV •• Solid barrel
Solid liner
Wear MN Wear resistant, through-hardened special tool steel 62 -3 ••• •• Solid liner
Corrosion R Corrosion resistant, through-hardened special tool steel 57 -3 •• ••• Solid liner
High wear FRC Highly wear resistant PM-coating
on Fe-basis
65 -6 •••• •• Coated liner
 CA  Soldered, extremely wear resistant coating with tungsten carbide in NiCrB-matrix  67 -5  •••••  •• Coated liner
High wear and high corrosion AT Wear and highly corrosion resistant PM-coating on Co-basis 55 -3 ••• ••••• Coated liner
AN1 Highly wear and highly corrosion resistant PM-coating on Ni-basis 62 -3 •••• •••• Coated liner
Resistance against stress:
• Low •• Low ••• Medium •••• High ••••• Very high
Special materials and designs available on request

 

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KraussMaffei Berstorff

The product brand KraussMaffei Berstorff is internationally synonymous with state-of-the-art and value-proven solutions in extrusion technology. The product range includes individual extruders with corresponding molds, upstream and downstream components and automated system solutions.