Hello. Chemical properties of Sa-965 F304L and Sa-182 F304L is same whereas UTS of Sa-965 F304L is 65ksi and of Sa-182 F304L is 70ksi. If you are talking about nozzle flanges then please note that standard flanges as per B16.5 of Sa-182 F304L is available whereas Sa-965 F304L are non-standard...