Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

Chime right in! (no registration req'd)

-----

"How to obtain RH950 Condition"





January 11, 2010

It is necessary to perform cryogenic treatment (-730C) to reach RH950 Condition? As known, this step only completes the martensite transformation.
And why this step relatively is so long?
CH Condition means (Cold Worked). What about R and T meanings?

Daniel Kurgansky
Materials Engineer - Israel
^


January 14, 2010

Hello Daniel!

You're talking about the semi-austenitic precipitation hardening stainless steels, such as 17-7 and 15-7. These are not fully martensitic after solution treating, and need additional "pushing" to fully transform. Hence you either cold work the material, to get to condition C, or you give it an austenite conditioning step which will cause full transformation to martensite. The R and the T treatments are two that are recognized as successful, and are documented in heat treat specifications such as AMS 2759/3 or Mil-H-6875.

You'd likely benefit from reading DMIC report 111, from April 1959, on "The Physical Metallurgy of Precipitation Hardening Stainless Steels". Send me an e-mail and I'll send you a copy. I'm not that hard to find...

lee gearhart
Lee Gearhart
metallurgist - E. Aurora, New York
^

none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA