Car carrier on fire 1

[IRstuff]

Hardening a roller might not do too much; I recall a thread ;-) where the OP was asking about something harder that steel to prevent cotton thread from cutting into rollers. thread367-92753

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[TugboatEng]

Some boats don't have rollers. In the Navy towing manual they recommend cap rails be at least 50 HRC.

 

[EdStainless]

Thread guides are usually ceramic these days.
And it still cuts into them eventually.
I believe that the USN sometimes used PH stainless for these wear parts then they don't worry about corrosion either.

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P.E. Metallurgy, consulting work welcomed