The screw elements, liners and barrels of twin-screw extruders are subject to severe wear and corrosion conditions during the extrusion process.
KraussMaffei Berstorff uses a variety of materials and coatings to ensure excellent protection of the extruder components for the most diverse requirements.
Wear and corrosion protection of screw elements
| Wear / corrosion performance: • very slight •• slight ••• medium •••• strong ••••• very strong |
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| Materials | BER Material Code |
Wear protection |
Layer thickness [mm] |
Hard- ness |
Area of application |
Remarks | |
| Wear | Corrosion | ||||||
| Nitrided steel | A | Hardened, nitrided | 0,5 | 850 HV | •• | • | Standard |
| HIP composite material | Z9 | Powder metallurgically produced corrosion proof special tool steel |
Through hardened | 57-3 HRC |
••• | ••• | Standard |
| Z10 | Powder metallurgically produced wear resistant special tool steel |
62-3 HRC |
•••• | •• | Standard | ||
| Z55 | Powder metallurgically produced corrosion proof and wear resistant special tool steel |
60-3 HRC |
•••• | ••• | Upon request | ||
| Z44 | Powder metallurgically produced wear resistant special tool steel with carbides |
63-2 HRC |
••••• | • | Upon request | ||
| Deposition weld | Ni-basis materials with Ni-basis hard faced flights | >3 | 45...55 HRC |
• | ••••• | Upon request | |
| Ni-basis materials with co-basis hard faced flights | 45…58 HRC |
• | ••••• | Upon request | |||
| Fe-Basis materials with Co/Ni-basis hard faced flights | 42…58 HRC |
••(•) | •••• | Upon request | |||
