Another heat treat oven....?

sunny_2_75

sunny_2_75

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Nov 23, 2009
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Alright everyone, I'm considering buying another heat treat oven. Here's why I think I need two...but thought I would ask and get some feed back. My current choice of steel is cpmD2. What I have read for heat treat is ramp to 1400 soak and equalize then full ramp to 1850 soak for 20mins then quench. I currently use a sugercreek 24 inch oven. It takes a good long time to heat to 1400 and quite a bit longer to get to 1850. It seems like it's takes to long. I read that it would be optimum to use two ovens. One for the initial heat and soak , remove and place in the other oven that is set at the austinizing temp. I make no claims to be an expert but it makes sense to me that your not leavining it in the oven so long. Whith that said....I have some cpm 154 that I've been sitting on. I did a knife or two and just didn't get the results I had hoped for. For one this oven doesn't seem to hold the heat that well as it will fluctuate up to 10 degrees while at temp. Thought I would ask. I'm looking at a paragon oven. I know it will be a good upgrade one way or another. If you really think I don't need both then I would probably sell the other locally.
 
Sorry I can't help with your HT question but I sure wish I had 2 ovens. It would be nice to be able to temper immediately after the blade reaches room temp instead of sticking it in a toaster for a couple hours while the oven cools down.
 
Yes I thought about that to, it will be nice to have two. But before I go there, what I was really trying to ask is, does the amount of time a knife is in the oven while the oven is reaching it austinizing temperature have an effect on the end result?
 
sunny_2_75 said:
Yes I thought about that to, it will be nice to have two. But before I go there, what I was really trying to ask is, does the amount of time a knife is in the oven while the oven is reaching it austinizing temperature have an effect on the end result?
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No, as long as your not going over critical.

Stan
 
Within reason (it should take less than half an hour) the ramp time from 1400 to 1850 is not a problem. If the oven heats up and ramps slowly, make sure your controller is programmed correctly. The ramp rate should be 9999/Hr.
Yes - There are such things as dual chamber ovens....in labs. They cost nearly what a new car does, though.
 
We're making the same transition from Sugar Creek to Paragon. Our SC fluctuates unacceptably (10-20 degrees) above hold temp, then slowly comes down and ramps very slowly at 240v. The Paragon has a much smaller internal volume and should ramp much more rapidly. The slow ramp is not a big deal, but it does need to be accounted for as carbon and alloy comes into solution as a function of temperature AND time, so your soak time may need to be less if your ramp is slower. On the other hand you may not need a preheat equalization as much in some applications as the 150-200 deg swing from opening the door takes so long to come back up to temp the knives will heat more evenly in cross-section than they would with a fast ramp.
 
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