How to distinguish and inspect qualified tantalum, niobium, zirconium and nickel raw materials?

Spectral chemical analysis is the primary test to verify purity and impurity content; qualified high-grade products control oxygen, nitrogen and carbon within ultra-low limits to avoid brittleness. Metallographic inspection checks uniform grain distribution and eliminates segregation or brittle inclusion phases. Mechanical testing measures tensile ductility and bending performance to confirm no internal embrittlement defects. Corrosion immersion testing simulates service media to verify passivation film stability. Nickel raw materials additionally conduct magnetic and high-temperature oxidation tests to meet alloying and structural manufacturing standards for downstream production.