What's the best material for PP hollow corrugated sheet machine screw and barrel?

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The material for PP hollow corrugated sheet machine screw and barrel

Type for screw and barrel	Bimetal
Base raw material for screw and barrel	38CrMoALA
Alloy powder	Ni+Co+Cr+W+Si+Fe+B+C
Surfacre treatment	plating Cr

Main specifications for PP hollow corrugated sheet machine screw and barrel

Extruder screw and barrel diameter	15mm-300mm
L:/D	15-45
Modulation hardness	HB260-290
Nitriding hardness	900-1000HV
Nitriding layer deepth	0.5-0.75mm
Plating Cr layer deepth	0.5-1mm
Plating Cr hardnedd	HV>85
Bimetal alloy layer deepth	1.2mm-2.0mm
Bimetal alloy layer hardness	HRC50-65
Nitrided brittleness	《 one grade
Surface roughness	Ra 0.4 U
Straightness	0.015mm

Tongsan provide good quality PP hollow corrugated sheet making machine for you

The specially designed screw and the advanced controlling system ensure excellent plasticization,high output and stable extruding.

The bimetal alloy screw and barrel can service longer than the common type.

We have the co-extrusion type to use the recycled plastic to reduce the cost with high quality products.