Hello all, I know Sandvik says not to reheat treat their SS, but what about other manuf's? I've a small petty chef I profiled from .068" S30V, HT'd to Rc 60 per S30V datasheet instructions. I was pleased with HT - then I started grinding. Started with a belt that "felt" like it had plenty of grit, but it wasn't "sharp" grit. Slow cutting and put too much heat to blade and got some color. My procedure is grind a pass, dip in water, grind next pass. It just wasn't cutting the metal much and blade getting too hot. I allowed some blue color to creep to blade while grinding. I'd heard so much about how hard S30V was to grind it just didn't click dull belt. About half way thru I decided to try a new belt - WOW!!! cut just like it should and no problem with heat at all. BUT - too late.
While it's still hard enough to take an edge (easy shave arm, push cut paper, etc), at places in edge, it will roll more than I like with the brass rod test, other places the brass rod test passes just fine. So, I'd like to reheat treat this blade. Is that a problem?
Would the correct procedure be as listed for stress relieving hardened parts? "Heat to 25-50°F (15-30°C) below original tempering temperature, hold 2 hours, then furnace cool or cool in still air."
That would mean I should put in oven at 1950ºF and soak for 2 hrs, then turn oven off and allow to cool slowly. Next day I would simply re-HT per standard? Does this sound right? Of course, this would be wrapped in SS foil.
Ken H>"
While it's still hard enough to take an edge (easy shave arm, push cut paper, etc), at places in edge, it will roll more than I like with the brass rod test, other places the brass rod test passes just fine. So, I'd like to reheat treat this blade. Is that a problem?
Would the correct procedure be as listed for stress relieving hardened parts? "Heat to 25-50°F (15-30°C) below original tempering temperature, hold 2 hours, then furnace cool or cool in still air."
That would mean I should put in oven at 1950ºF and soak for 2 hrs, then turn oven off and allow to cool slowly. Next day I would simply re-HT per standard? Does this sound right? Of course, this would be wrapped in SS foil.
Ken H>"
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