Hi Guys, Question regarding the heat treatment of D2. If this is an inapropriate location please feel free to move to a different one.
Is it possible and feasable to heat treat a D2 knife in a backyard forge using a hardwood charcal forge? A friend came back from a gun show with a blade blank he wants me to finish for him. The seller reports that it is not heat treated.
Thanks in advance!
D2 requires a pretty complex HT to take full advantage of the alloy. This is some of what I've culled from the net as far as D2 blade HT's is concerned:
"Short answer: austenitizing time is 30 min once the blade is at temp (about 45 minutes after I start the ramp up). Temp is 1850. These are very standard values and they work. I leave the blade in the foil, with the seams to the side where they don't interfere and plate quench. The rapid quench is important. I check for straightness and go directly into dry ice. Temper was at 450, 2X. Not rocket science. "
"D2 is a complex steel to heat treat. It's needs a controlled enviroment, high temps (around 1850 degrees) and a soak time at that temp for at least 40 minutes. Unless you have a heat treating kiln, it's best to send it to a heat treater. http://www.texasknife.com which is Texas Knifemakers supply can do it for you. Click onto services on the left hand side."
"From what I could find on D2 you do a controlled temperature rise, preheat it for a while at like 1300 (just throwing that out as an example, can't remember the exact number), then take it up to soak at 1800, then a controlled cool down prior to tempering. One of these days I'll spring for an oven, but can't really justify it when TKS will do it for $5 or so, hope they do acceptable work, which I've heard they do."
Equalize at preheating temperature of 1450 - 1500 degrees F, than raise temperature to 1825 - 1875 degrees F, soak, and cool in air.
This hardening temperature is critical, overheated blade will not get as hard as it should.
It requires a 20 minutes of soaking time at the hardening temperature prior to air cooling.
In order to prevent any possibility of recarburization, it is desirable to use a controlled atmosphere furnace."
And here's a good .pdf link:
In short, it seems like your best bet may be to send it out to some place like texas knifemaker's to have it HT'd.