Ray Rogers
11-18-2001, 04:02 PM
Has anyone got a good formula for heat treating CMP 420V? The Crucible website lists the temperatures but not the timing.
Would appreciate any advice you may have....
Would appreciate any advice you may have....
View Full Version : Heat treating CPM 420V Ray Rogers 11-18-2001, 04:02 PM Has anyone got a good formula for heat treating CMP 420V? The Crucible website lists the temperatures but not the timing. Would appreciate any advice you may have.... JHossom 11-18-2001, 04:35 PM Their book recommends 10-30 minutes, but that's for thicker sections. I would think 10-15 would be plenty for knife baldes. The book also suggests using a salt bath or interrupted oil quench, which is really aimed at getting the temperature down to 1000F as fast as possible. Ray Rogers 11-18-2001, 09:27 PM Thanks, Jerry. That's about what I figured but I only have one piece of this steel so I thought I'd check with the experts... JHossom 11-18-2001, 09:43 PM Whoa Ray, I'm no expert. Paul Bos does all my tempering. I was just reading what was in the book. Good luck with it. Rob Simonich 11-20-2001, 11:13 AM The only thing I would add is use the longer soak times on these high alloys. Also, rather than interupted oil, you can use a press quench for a very fast quench. Ive gotten good results that way. Gary Mulkey 11-20-2001, 06:02 PM Rob, I'm going to show my ignorance but would you explain the process of a press quench? Gary Mulkey Rob Simonich 11-20-2001, 09:07 PM Gary, the press quench is nothing more that quenching the knife between 2 thick pieces of steel or aluminum. Aluminum works the best. There are several ways to do it but I take the knife out of the furnace, strip the foil off and very quickly lay it on a 1/2" aluminum plate on the floor, put an aluminum plate on top and either stand on it for a minute or put my anvil on top. You get a very fast quench and blades come out flat. It dosent work on tapered tangs however. Gary Mulkey 11-21-2001, 07:42 AM Thanks Rob, I may play with it some on some 3V that I've had some warpage problems with. I know Crucible recommends that you quickly quench to 1000 degrees and then a slow air quench to room temp. If I can get to where I can judge how long the press quench takes to get to 1000 and then remove the blade it might cure the warping. Gary s mcfall 11-27-2001, 08:27 AM does paul bos have a web page or e-mail? thanks, stan JHossom 11-27-2001, 09:35 AM No webpage, but here's his email. PaulBos@buckknives.com Bill Foote 11-28-2001, 05:48 PM He does a great job and can give it the cryogenic soak. His prices are good, too. Paul Bos 1900 Weld Blvd. El Cajon, CA 92020 619-562-2370 JHossom 11-28-2001, 06:13 PM BTW, I believe Rob Simonich does heat treating too. Knowing the knives Rob makes (I have one), he's as good as they come as well. Rob Simonich 11-28-2001, 10:38 PM Thanks for the plug Jerry.......but................I am only heat treating my own stuff at this time. It was taking too much of my time and I had to prioritize making knives over heat treating. In fact I will be using Paul Bos on some bigger batches. You cant find anyone better than Paul! |
|