How to identify qualified Hastelloy alloy raw materials before bulk purchase?

Buyers need to verify complete factory test certificates covering precise chemical composition, room and high-temperature mechanical properties, intergranular corrosion test results and grain structure inspection data. Qualified products have uniform element distribution without internal segregation, pores or cracks. Spot chemical analysis and corrosion immersion tests can be conducted on samples to check anti-pitting performance. Unqualified low-cost substitutes with insufficient molybdenum or chromium will face rapid corrosion failure after short-term operation in harsh media.