Anyone else seeing more POs specifying ≤1.5 ppm hydrogen on bar and plate, explicitly by ASTM E1019 rather than weld bake-out proxies? We validated CGHE at 900°C with tin flux and daily two-point calibration against certified steels (LOD about 0.05 ppm) and are debating moving it from qualification to routine receiving — how are your QA plans handling test frequency and lot traceability?