Yes, those prehard steels that I like; I "like" Maxel instead of Cold Rolled (seems to come in anywhere from around rc 10-18 (really 4130 to 4140), and Maxel 3 1/2 (around rc28) and Impax Supreme (rc30 to 32) (both really 4150) all have some pretty nasty scale on them....I guess all new stock prehard is that way but its the best stuff for "general purpose", support/compression applications...and pretty good for wear.
I don't feel the scale is much worse than crummy old hot rolled (LOL) (At least to a carbide cutter)...But it's best to properly get that dust off your ways and surfaces eh!?
IMO A2, D2, and S7 are the best all around Tool Steels (in that order with the % of "stuff" like chrome in them),...They have no scale, cut nice, then Heat Treat (for/when and the application usually is wanted/needed) They H.T. with a torch (0xy/acet.) ifn' one has no oven and you can hit your rc hardness up to 58-60 (even 62 with S7) with practice (the colors man, the colors! LOL) and air harden with, well, air from a compressor then you draw back a little bit (temper)...and they return to size (and shape ifn laid down or hung right) so one can just "shine up" with abrasive "paper" ifn one doesn't have Machine Tool Grinders or a bead/sand blaster...(Note: bead/sandblasting also relieves/helps the stresses after Heat Treat)...For small rounds, I like them better than drill blank too.
...all the above also come in plate for milling jobs etc (and plate can and usually is ordered flat ground)....
...the prehards don't like to return to size ifn' they get hot (they like to stay wherever they grow to)
...and all the above can work harden so ya' gotta watch that on the tiny and small stuff
I see/perceive you are starting out but even so, the above stuff from everybody is all good to know and combobulate in the whole thang"