Cryogenic Hardening versus Std. heat-treating?
Cryogenic Hardening versus Std. heat-treating?
(OP)
Can you explain when one would want to do cryogenicly harden instead of heat-treating it and why?
We use mostly hard iron materials (some stainless) moving medium to high percent of solids and at temperatures from ambient to 1500 Deg. F.
What are the good points and bad points for each process.
Why are there so many hardening processes - you can never know which one is best.
If you harden materials you usually can't weld repair them without propagating the crack. Does the same apply to a part that has been cryogenic hardened?
Need some background information and procedures to review plus feel a little more knowledgeable about the subject when asked.
Thanks
We use mostly hard iron materials (some stainless) moving medium to high percent of solids and at temperatures from ambient to 1500 Deg. F.
What are the good points and bad points for each process.
Why are there so many hardening processes - you can never know which one is best.
If you harden materials you usually can't weld repair them without propagating the crack. Does the same apply to a part that has been cryogenic hardened?
Need some background information and procedures to review plus feel a little more knowledgeable about the subject when asked.
Thanks
Wayne E. Lovison
service-parts@naglepumps.com





RE: Cryogenic Hardening versus Std. heat-treating?
Most cryogenic treaters are egear to prove the process and will treat some parts for you at no cost to you. I'll be happy to talk with you more, if you like. E-mail me and I'll send you my toll free number and we can talk at length.
There is also a link to my web site at the top of the Cryogenic Engineering section of this site. Doug
Dougb
RE: Cryogenic Hardening versus Std. heat-treating?
Doug,
I have a few more questions but I need some time
to gather up my thoughts. Chinnia also replied
so I have more data to review. I appreciate your
thread and details are falling into place.
I will get back to you shortly.
Thanks Again,
Wayne E. Lovison
service-parts@naglepumps.com
RE: Cryogenic Hardening versus Std. heat-treating?
This is a great topic, and I feel darned motivated to learn something about it. Thanks in advance for pointing me in the right direction.
RE: Cryogenic Hardening versus Std. heat-treating?
RE: Cryogenic Hardening versus Std. heat-treating?
Please review web sites below;
http://www.In2cryo.com/howitworks.html
and
http://cvip.csufresno.edu/~rlk16/cryo.html
This subject is new to me as well. Its not really understood by those who do this process. There are no ASME or ASTM procedures for this type of hardening. There are many who say it does remarkable things and others who say it depends on what you are trying to accomplish.
I'm in the research stage gathering information that will hopefully allow me to make a decision. Suggest test pieces be assembled and sent to a facility doing these types of hardening processes. Then you can compare the results.
Wayne E. Lovison
service-parts@naglepumps.com
RE: Cryogenic Hardening versus Std. heat-treating?
Results????? cryo'd rotors have yet to warp- stop harder than ever... razorblades dont rip your skin - last longer..... the coring bit's life was almost tripled,,,, other drill bits last longer as well.. the gears- i cant say... still driving the truck.
RE: Cryogenic Hardening versus Std. heat-treating?
Cryogenic cooling finishes the job;really nothing much more, no magic. Since martensite expands when treansforming from austenite by 4%, it will change residual stress, perhaps beneficially depending on what it was before cryo-quenching.
RE: Cryogenic Hardening versus Std. heat-treating?
RE: Cryogenic Hardening versus Std. heat-treating?
The common single point where benefit can be seen is on components which are involved in cutting, whether that is machine tools or razor blades.
A number of Automotive manufacturers are now treating crankshafts.
RE: Cryogenic Hardening versus Std. heat-treating?
AS for uses, there are quite a few. Over one half of the Winston Cup racers are using parts processed by one company alone. The US postal service specifies the process for use on brake disks for their deliver vans.
The process is real, It just needs some research. That should not prevent its paractical use in the mean time.