my background is industrial engineering design builds and i see the same requirements in many owner specs, all the way back to 2009, "no pressure parts: pipe, valves, flanges, fittings, or rigging from chinese suppliers", for that exact reason. The mill tests/CFCs are not guaranteed, sometimes even outright falsified. And the root cause safety analysis confirms the safety incidents that do occur were from poor material traced back to chinese suppliers. Owners and even some GCs ban chinese material because of it.