Where 316 stainless fails in seawater, Inconel 625 thrives — this nickel-chromium-molybdenum alloy resists pitting, crevice corrosion, and stress-corrosion cracking in environments that would destroy stainless steel. Also holds strength from cryogenic temperatures up to 980 °C. The preferred alloy for subsea wellheads, aerospace exhaust components, and flue-gas desulfurization equipment.
Essentially immune to chloride stress-corrosion cracking — the go-to for subsea oil & gas components.
Retains full structural capability at 650 °C; still useful at 980 °C for non-structural exhaust ducting.
Flue-gas service, incinerator components, and petrochemical cracking equipment.
| Element | Content |
|---|---|
| Nickel | 58% min |
| Chromium | 20–23% |
| Molybdenum | 8–10% |
| Niobium + Tantalum | 3.15–4.15% |
| Iron (max) | 5% |
| Carbon (max) | 0.10% |
Composition per ASTM B446. Specific mill test reports (MTR) available on request for production orders.
Budget 3–4× the machining time vs 316 stainless. Ceramic tooling or carbide at very low speed with high feed.
Never dwell in cut. Every pass must take a proper chip — rubbing creates a hardened skin that destroys the next tool.
If actual service is below 400 °C and not seawater, super-duplex stainless (2507) may deliver 80% of the corrosion performance at 30% of the cost.
Full DFM review by a mechanical engineer. No automated bot rejection. FOB Ningbo or DDP to your door.