Quote:
JIS S45C grade carbon steel is widely used in machinery manufacturing, good mechanical properties of this steel. But S45C Grade Steel is a medium carbon steel, hardened performance is not good, 45 steel can be hardened to HRC42 ~ 46. So if you need to surface hardness, but also hopes to play 45 # steel superior mechanical properties, often 45 # steel surface carburizing, so you can get the required surface hardness. JIS S45c steel are mainly used for a variety of motor shaft, automotive parts.
So assuming they heat treated it properly, maximum hardness you could expect is a rockwell 46, typically for straight razors we're looking for mid 50s to low 60s. There's a bit of a trade off, at the higher end of the rockwell scale it's hard to remove material and get a working edge, on the lower end it's fast to sharpen because the steel wears faster, which leads to faster dulling as well. So it's probably a little on the soft side, and given Glen's test probably takes a nice edge but loses it faster than we would like. Slightly prettier/better ground Gold Dollar would be my guess.