S35VN heat treat problems fixed!

G

godogs57

Joined
Apr 16, 2004
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Referencing my previous thread about less than perfect results with my ht process, I believe Old Lady Luck kissed me square on the mouth yesterday. My ht process before was 1950 @ 30 minutes, LN two hours, two tempers @ 400. It resulted in a Rockwell of 54-55.

Many suggestions were offered and appreciated. I didn’t want to lose the six blades I had worked up so I took a long shot and annealed them at 1375 degrees for four hours as suggested in the previous thread. Let em air cool and my hardness tester indicated 36-38 Rockwell on the blades. So far so good.

Wrapped in foil and hit 2025 degrees for 20 minutes. Aluminum plate quench, deep freeze for 24 hours followed by two tempers @ 400 degrees. Everything went beautifully and they all hit 61.0 Rockwell. I was stunned. I’ve never re-annealed stainless and then re- heat treated.

Thanks for your suggestions in the previous post! They were a great help. One thing I’m planning on doing is buying another thermocouple asap….just to make sure. I replaced the heating elements two ht cycles ago….should have bought one when I bought the new elements.
 
by 'deep freeze', so you mean in the freezer?
 
that's all I have available:thumbsup:
 
Since you seem to have LN, after heating to 2,025°F, then quench - why didn't you use LN again? Heating that hot and only using the freezer you're bound to have a good bit of RA left in the blade. Still, tempering at 400°F and having 61 Rc sounds like a good result. Congrats, glad the annealing worked for you.
 
Ken H> said:
Since you seem to have LN, after heating to 2,025°F, then quench - why didn't you use LN again? Heating that hot and only using the freezer you're bound to have a good bit of RA left in the blade. Still, tempering at 400°F and having 61 Rc sounds like a good result. Congrats, glad the annealing worked for you.
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Because the welding supply is charging me out the ying Yang for LN now. I always had em fill up a Yeti thermos @ $20. No big deal. This last time they charged me $70-something for the same thing. Pissed me off.
 
WOW - that's a bunch. I fill a 10 liter dewar for $5 at the place in Mobile, AL. That's 50¢ per liter. Cost more to make the 50 round trip than buy the LN. Local welding supply 5 mile away wanted $62 to fill the same 10 liter dewar.
 
Yes, fins a liquid gas supplier. Welding shops are usually crazy high on LN. Often, a one-hour drive can save a lot of money.
 
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