View Full Version : Critical Temperature

Rick E
02-21-2003, 09:27 AM
I would like to know the critical temperature for o-1 and ATS-34 steels and where I could purchase bar stock for these and perhaps other types also. Any help would be appreciated.
Rick E.
Also what drawing temperature would produce Rc of 60 for ATS-34?

02-21-2003, 10:27 AM
o1 runs around 1450 to 1500 and is oil quenched and
most knife making supplier carry it as well as ats -34.
Now ats-34 is a different animal it is air queched .It
need to be taking up around 1900 and soak for 30 min.

you might post this in high performance steel forum as well:)

Ray Rogers
02-21-2003, 10:32 AM
Basic heat treating information is available in the catalogs from most of the major knife supply companies. All of the popular blade steels can be purchased in small quantities from them as well. You can find ads for these companies in Blade and Knives Illustrated magazines. Sheffields, K&G Supplies, Texas Knifemakers, Koval, and Jantz are all good suppliers whose catalogs you should have.

Contact information for these suppliers can be found on the Links page of my website:

One fairly thorough source of heat treat info can be found here:

Jan Dox
02-21-2003, 02:21 PM

O1 is not that hard to heat treat yourself even with very basic equipment, but ATS34 and other high-alloy stainless and tool-steels are best treated by professionals becaeseof the very critical temperatures and soaking times needed for optimal results.It takes a very precicely controlled oven and not everyone can afford those plus the professionals can do it in big atmosphere controlled ovens for a nominal fee.
Some charge based on the weight of a set of knives , others charge per knife.

Like Ganmade said : "look at tha High Performance blades" for clues about heattreating, and what to ask the heattreater to do.


02-21-2003, 04:18 PM
440-C steel Air harden from 1850 to 1950 F. Draw at 325 F. Freezing to dry ice temperature for several hours before the draw will enhance toughness and hardness remarkably. Don't bother with 440-A or 440-B.
154 CM, ATS 34 steel Air harden from 1975 F. Straighten before they cool below 250. Freeze at -220 F for 6 to 8 hours. Double draw at 950 F, two hours each cycle. (Paul Bos method) Gives RC 59 - 60 and marvelous durability.