In complement to the screw, the barrel must be steel compatible.
There is no standard for barrels.
Material choice
Nitrided steel
abrasion resistant
for not charged or little charged polymers.
not suitable with carbide armoured screws.
Bimetallic
ABR : abrasion resistant, more than nitrided.
ABR/COR : abrasion + corrosion resistant.
COR : only for corrosion resistance as with fluoropolymers.
800 : the most resistant in abrasion and corrosion.
not suitable with nitrided screws.