625
Strong corrosion resistance and weldability make 625 a common choice for corrosion-resistant weld overlays and oil & gas / chemical service.
617
Designed around elevated-temperature strength plus oxidation/carburization resistance; a different design target from corrosion-overlay-focused 625.
718
A precipitation-hardenable high-strength alloy used where mechanical strength and fatigue are critical. It should not be treated as the default choice for corrosion overlay.
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