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2 x 72 belts

(VSM Ceramic belts made in Germany) inexpensive but good
TruGrit has, $5 - $7 ea
https://trugrit.com/

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Ceramic 36 grit for fast removal (or 24 grit if you want to be really aggressive)
piece will tend to stay cooler

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100 grit ceramic
piece will get hot

Finishing

3M Trizact Trizact
Will need belt cleaner
a bit priceypricy, but last a long time
from TruGrit, about $10 each

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Scotchbrite
But alternative brand  (Red Label)
Also good for mill scale
Amazon - Red Label Abrasives 2 X 72 Inch Non Woven Surface Conditioning Sanding Belts for Knife Makers and Metal Fabricators - Coarse, Medium, and Fine Grits - 3 Pack Assortment. Set  Set of three about $50 from Amazon
There is also an Extra Fine version

Norton Norax belts
pricey pricy but good
Have to search to find but Texas Knifemaker's Supply regularly carries  https://www.texasknife.com
Come in up to at least 3000 grit, about $12 per belt.

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I have belts up to 2000 grit. After  After that, for polishing steel (or aluminum), I use 3M Trizact disks in 35, 10, and 5 micron grits in a random orbital sander and final polish with 3M Fine Machine Polishing Compound on a buffing wheel. Gives  Gives a mirror finish.  (But, as I've been told many times, avoid a 'mirror' finish - it shows every flaw. (but done right it's exquisite))

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Maverick Abrasives            https://www.maverickabrasives.com/
Combat Abrasives            https://www.combatabrasives.com/
(Both of the above appear to be the same place doing business under 2 different names.
Combat site is easier to navigate.)
Tru-Grit                        https://trugrit.com/
Texas Knifemakers Supply    https://www.texasknife.com
Amazon                        www.amazon.com
Jantz                        https://knifemaking.com/
Pops Knife Supply            https://popsknife.supplies/
Alpha Knife Supply            https://www.alphaknifesupply.com/shop/