We purchased Twin screw extruder. We had given specifications for contact parts (i.e. barrel and screw elements) to be made of SS 410. Manufacturer supplied the machine stating that contact parts to be of SS 410. We are processing wet maize starch in the extruder. Normal iron content of maize starch is 10 ppm, whereas after we processing wet starch in extruder we are getting iron content 100 ppm. There was very high contamination of iron in the material. After opening extruder we foung there rust on all screw elements but no rust on barrel portion (stationery part).
I want to know:
1. Does SS 410 has adquate corrosion against neutral water at 120 degrees centigrade
2. If it does have the corrosion resistance, why are we getting rust. Could it be that manufacturer has supplied us wrong material of construction.
3. How to veryfy if the material of construction is SS 410
4. If SS410 is unsuitable what could be alternative MOC for extruder having good hardness equivalent to SS410.
corrosion resistance of SS 410
Re: corrosion resistance of SS 410
