Every once in a while someone asks me if the standard available knife heat treating furnaces are good enough for the task. Occasionally I see someone say that the common brands aren’t accurate or high quality and that anyone serious about heat treating should use an “industrial” or “scientific” furnace instead. Going through school doing steel research and then working in steel as my career means I have been around a lot of furnaces. There are all different types and while some are very high quality, the differences can be surprisingly small between furnaces you might see at a University and one you would get from EvenHeat or Paragon.
But this post is not just about the relative quality of EvenHeat furnaces. I also have some guidance in how to use the furnaces effectively based on a few simple measurements. And I tested out a method for heat treating that I have seen recommended on forums and Facebook in the past.
The furnace I own is the EvenHeat LB 22.5. I purchased my EvenHeat a few years ago and this is not a sponsored post. The LB models were modified from earlier EvenHeats to remove elements along the back of the furnace. The elements at the back can create a gradient where there is a hotspot in the back and cooler as you move toward the front of the furnace. That gradient can be exacerbated by the heat loss at the door. The LB models have a maximum temperature of 2200°F. There are also KO models with a somewhat smaller chamber that can reach 2400°F. The LB models are 220V, which allows them to heat up more quickly and to rebound more rapidly after temperature loss such as after putting a knife in the furnace. The KH models run on 120V which use an even smaller chamber than the KO but are still about half as fast as the LB models.
It was neat to see Larrin write a review as opposed to his technical dives into steel, though there is plenty of that as well.View Linked Article