All critical fabrication operations keep newly delivered materials in quarantine until various quality assurance tests are done to ensure the nature and quality of the stuff.
The big question is: how many times did the Navy QA lab find substantive differences between the material's certificate and the actual testing values?
“There is No Way these batches were not re-tested by the shipyards”
Perhaps, but I doubt it. Raw materials purchased for the Navy are more likely to be source inspected — and that would involve inspecting the paperwork that accompanies the batch lots for the material. If the paperwork looks good, it’s pretty much assumed to be good when delivered to the shipyard — unless they ‘catch’ a curious fault cutting & fitting the steel there is little reason to go back & re-test.