Hi,
You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.
Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.
Again, these simulated no. Of cycles shall be specified in MTC.
The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).
One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.
In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Without any mill PWHT) which is not address your simulated min condition.
I assume that you have to speak with your forging mill so that they expose one item to your minimum PWHT that defined by you as MFR and then they should include both. Min and Max.
Best Regards
Ahmed Eissa
002 01224816994
On Tue, Mar 28, 2023 at 5:09 AM, Hammm jinooo
<jinoham51@gmail.com> wrote:
Hi
Client has required 4 cycle for SA266 GR4N, They requested the certificate shall included all required test at both conditions, min and max simulated PWHT Cycles,
Our forging mill has issued MTC with mechanical property, before PWHT and after PWHT But they commented " test after SPWHT performed after 4 cycles(max condition-i think after 4 times we mentioned the result as after SPWHT) and missing test after min condition"(I think there is missing test result of min SPWHT condition)
Could anyone give us idea how to solve this issue and what test result shall be added
Can we say min and max SPWHT? We performed 4 times of SPWHT as client's request..
what you guys think min SPWHT condition?
Regards,
ham
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