Dear Experts,
Which cooling cycle shell be followed? Rapid water quenching or slow cooling in furnace up to 300º C. Is it required to trail mock up tests (IGC, tensile and flattening) after simulation HT i.e. Solution Annealing + stabilization HT? Will these tests satisfactorily pass?
Thanks & regards,
C. R. GANDHI
From: Umang Parikh <parikhhumang@gmail.com>
To: materials-welding@googlegroups.com
Sent: Sunday, February 16, 2014 6:25 PM
Subject: Re: [MW:20113] Stabilizing Heat Treatment of SS 321
The perpose of stabilization is to deleberatly make TiC in the material thereby decreasing the possibility of CrC when it is exposed to the sensitization range .
Now when you do solution anealing after stabilisation all TiC will again go into the solution .& when it will be exposed to service condition CrC will form.This will decrease corrosion resistance by lowering Cr.
So after every solution anealing you have to again follow stabilization
Now when you do solution anealing after stabilisation all TiC will again go into the solution .& when it will be exposed to service condition CrC will form.This will decrease corrosion resistance by lowering Cr.
So after every solution anealing you have to again follow stabilization
On 16 Feb 2014 16:19, "CHINTUKUMAR GANDHI" <cgandhi1975@yahoo.com> wrote:
--Dear Experts,In one of our client project spec., it is specified that SS 321 pipes shall be in a stabilized HT condition. Stabilizing HT shall be carried out subsequent to the normal solution annealing. Soaking temp. & holding time for stabilizing HT shall be 900º C & 4 hrs respectively.My questions are (1) what is the purpose of stabilizing HT (2) This stabilized HT pipe shall be solution annealed after bending in coil form. Is it allowed or again we shall have to carry out stabilized HT after solution annealing? Client Spec. asks for solution annealing HT only after bending in coil form.Your prompt response on the above shall be highly appreciated.Thanks & regards,C. R. GANDHI(QCM)
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