High Strength Inconel 625 UNS N06625 Alloy Corrosion Resistant
UNS N06625 is a nickel-chromium-molybdenum alloy with outstanding corrosion resistance and high strength over a broad temperature range from cryogenic to 980°C (1800°F). The addition of niobium (columbium) and tantalum provides exceptional resistance to pitting, crevice corrosion, and chloride ion stress-corrosion cracking.
Unlike many high-temperature alloys, UNS N06625 does not rely on precipitation hardening for strength. Instead, it derives its high tensile and creep-rupture strength from the solid solution strengthening effect of molybdenum and niobium. This gives the alloy excellent weldability without the need for post-weld heat treatment, making it ideal for fabricated components in aggressive environments.
| Parameter | Details |
|---|---|
| Standard | ASTM B444 (Seamless Tube), ASTM B704 (Welded Tube), ASTM B443 (Plate/Sheet), ASME SB444 |
| Grade / UNS | UNS N06625 |
| Type | Seamless tube / Welded tube (ERW / EFW) |
| Outer Diameter | 6.0 mm – 610 mm (1/8″ – 24″) |
| Wall Thickness | 0.5 mm – 50 mm (SCH 5S – XXS) |
| Length | 6 m / 9 m / 12 m, or random lengths |
| Process | Cold drawn / Cold rolled (seamless); Plate rolled (welded) |
| Finish | Annealed & pickled / Bright annealed / Polished |
| Ends | Plain end / Beveled end / Threaded |
| Packaging | Hexagonal bundles + plastic end caps + seaworthy wooden crates or pallets |
| Marking | Grade + Size + Heat No. + Standard |
We supply Inconel 625 in all standard mill forms, cut to size, with full traceability. Custom dimensions and special finishes (ground, polished, machined) are available.
| Product Form | Size Range | Key Specifications (ASTM / ASME / AMS / ISO) |
|---|---|---|
| Plate / Sheet / Strip | Thk: 0.5mm - 100mm | ASTM B443, ASME SB443, AMS 5599, AMS 5869, ISO 6208, DIN 17750 |
| Round Bar / Rod | Dia: 6mm - 300mm | ASTM B446, ASME SB466, AMS 5666, ISO 9723, DIN 17752, BS 3076 NA21 |
| Wire | Dia: 0.1mm - 12mm | AMS 5837, ISO 9724, DIN 17753 |
| Seamless Pipe / Tube | OD: 6mm - 219mm | ASTM B444, ASTM B829, ASME SB444, AMS 5581, BS 3074 NA21, DIN 17751 |
| Welded Pipe / Tube | OD: up to 914mm | ASTM B704 / B705, ASTM B751 / B775, ASME SB704 / SB705, AMS 5581 (Type 2) |
| Fittings (Elbows, Tees, Reducers) | All schedules | ASTM B366, ASME SB366 |
| Forgings (Flanges, Blocks, Rings) | Custom | ASTM B564, ASME SB564, AMS 5666, ISO 9725, DIN 17754 |
| Powder for Additive Mfg | 15-45µm / 45-106µm | ASTM F3056, AMS 7001 |
- European: VdTÜV 499, EN 10095, BS 3072/3074/3076 NA21
- Aerospace: MSRR 7264, NACE MR-01-75 (for sour service)
- Code Approvals: ASME Code Case 1935
- Filler Wire: ERNiCrMo-3 (AWS A5.14)
- Welding Electrode: ENiCrMo-3 (AWS A5.11)
| Comparison | UNS N06625 | UNS N06600 (Inconel 600) | UNS N06617 |
|---|---|---|---|
| Primary strength mechanism | Solid solution | Solid solution | Solid solution + precipitation |
| Molybdenum content | 8-10% | ~0% | 8-10% |
| Corrosion resistance | Excellent | Good | Moderate |
| Maximum service temperature | 980°C | 1093°C | 1093°C+ |
| Weldability | Excellent | Excellent | Requires PWHT |
Need Inconel 625 sheet, bar, pipe, or custom forgings for your next high-stakes project?
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