Monday, August 2, 2010

Re: [MW:6258] Re: Solution Annealing of Stainless Steels

Dear Jeff

How you define sensetization temp range and again this will depends on the time duration that material is held for and based on that only we will able to define the sensitisation and their further effect of carbide precipitation

Is it recommanded to carryout solution annealing for SS316L material which undergoes hot work ,without controlling temperature and duration less than 10-20 minutes and after that natural cooling?

Abhijit


Sent from my iPhone

On Aug 2, 2010, at 5:42 PM, Jeff <jwsowards@gmail.com> wrote:

Mansoor,

I assume you are referring to austenitic alloys since they are prone
to sensitization during welding and thermal treatments? You would not
expect a hardness increase in austenitic stainless steels after
quenching from a solution anneal. Austenitic stainless steels are not
hardenable since they do not form martensite on cooling.

Regards,

Jeffrey Sowards, PhD

On Aug 2, 6:12 am, Mansoor <mansoor...@gmail.com> wrote:
Dear All,
I am slightly confused about solution annealing of stainless steel.
In this process we heat the steel above the temperature range of
sensitisation (upto 900 deg C) and then we suddenly cools it so that
sensitisation temp range passes quickly.

I just want to know does this sudden cooling not increases the
hardness of Stainless Steel.
If No then Why.
If yes then how to avoid that increased Hardness.

Regards,
Mansoor.

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