Lots of options for that steel. Sort of middle-of-the-road wear resistance. Any silicon carbide (black) or aluminum oxide (might be white, dark/light grey, pink, blue or other colors) should work well, and lots of grit sizes are available in each. Polishing pastes like Flitz/Simichrome are aluminum oxide, and maybe the Autosol mentioned above is also. I'm sure diamond would also work, but may not be necessary. Green compound can often work as a finishing step, or just before bare-leather stropping.
David