Dear Alan and Meisam
Thank you for your responses.
In API 5L chemical analysis of X60 and X 52 even X65 are very similar especially in carbon equivalent and because this material want to be used in structure dosen't matter PSL1 or 2.
Original certificate issued for X60.
But i don't understand why standard defines these grades that don't differ much and with regard to in designing step usually you choose higher grade to decrease thickness,but in this case there isn't any benefit.
Additionally in AWsD1.1 X52 in group2 and X60 in group 3 and we have approved wps for group2.
Is it possible that contractor use from API 5L and designate this material to X52?
Regards
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