Stress relaxation cracking (SRC) could be a reason to have PWHT for thicker (20mm and above) stabilized stainless steel grades (mainly H grades) when operating between 427 deg c to 871 deg c.
if in your case, above condition doesn't meet than no require to have any heat treatment.
In case PWHT is required than shall be done near to 890 deg c for these SS grades. Preheat is not required in any circumstances.
If you are welding two pipes than avoid using welded pipes ,since welds in thicker SS grade material (as mentioned above) have more chance of SRC.
Thanks and Regards
Atul Khatri
On Sat, May 23, 2020 at 10:17 AM Kural <kuralen@gmail.com> wrote:
what is design and operating temperature of 347 ? is it pressure application ?Stabilizing treatment needs some in application if there is risk of SRCsimilarly please let me know what is the application of 310On Fri, May 22, 2020 at 9:53 AM Arun Nair <arunnair.mundakkal@gmail.com> wrote:Hello,--Weld joint between SS310 to SS347 kindly advice about heat treatment require or not? Either pre or post.ArunNair
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--Regards--
Kural
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