Corrosion is different than erosion.
My LMT with 4150 steel & chrome lining is just starting to show some frosting in the throat area it only has 4k through it.
Most of that is with LC, They all start to wear out sooner or later.
CHF raises the hardness not as much as HC or nitrating but none the less it raises the hardness level which will correspond with the wear rate. The harder it is the less it will wear so yes it does help.

