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That's an excellent point. I hope I didn't make this even more confusing by bringing the 400 grade steels into the conversation.
From what I can tell, the Rockwell scale isn't commonly used on 300 grade steel. I'm assuming it's because of its softness. I did find one reference that mentioned a 300 steel as having an RC of 11-13. Would that make sense?
-jb
: I would remind everyone that the 300 grade of
: stainless steel is non-magnetic and can not
: be hardened by heat treating. The 400 grade
: 420 and 440c is magnetic and can be hardened
: to 58-60 Rockwell. This is a measurement by
: which a piece of SS is put in a machine and
: punched. The depth of the punch is measured
: and the less a depression in the steel, the
: harder the steel. This is done before and
: after heat treating. Heat treating is
: heating the steel for lengthy periods
: (depending on the matl. and how hard you
: want it to be)of time to change it's
: internal molecular structure. The 400 grade
: of stainless steel is what a lot of
: knifemakers use to get a very hard knife
: that will hold an edge, but also is
: malleable enough that it will not shatter if
: dropped. (Cold steel, Buck etc. use 440c in
: many of their knives.)
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