Weldable Inconel 625 Alloy 625 Superalloy High Strength Corrosion Resistant
Inconel 625 is a nickel-chromium-molybdenum superalloy with niobium addition. This unique combination delivers exceptional high-temperature strength (from cryogenic to 1800°F/982°C) combined with outstanding corrosion resistance—including resistance to pitting, crevice corrosion, and oxidation.
Unlike many high-strength alloys requiring complex heat treatment, Inconel 625 derives its strength from a solid solution of molybdenum and niobium in the nickel-chromium matrix. This makes it inherently weldable and fabricable, simplifying manufacturing while delivering superior performance.
The precise balance of elements gives Inconel 625 its unique properties. Niobium (Nb) stabilizes the alloy and prevents sensitization, while high Cr and Mo provide corrosion resistance.
| Element | Content (%) | Role in Performance |
|---|---|---|
| Nickel (Ni) | 58.0 min (Balance) | Base element - provides austenitic stability & corrosion resistance |
| Chromium (Cr) | 20.0 - 23.0 | Primary resistance to oxidizing environments & high-temperature oxidation |
| Molybdenum (Mo) | 8.0 - 10.0 | Exceptional resistance to pitting & crevice corrosion in chlorides |
| Niobium + Tantalum (Nb+Ta) | 3.15 - 4.15 | Solid-solution strengthener; stabilizes against sensitization |
| Iron (Fe) | 5.0 max | Controlled for phase stability |
| Titanium (Ti) | 0.40 max | Grain refiner & carbide former |
| Aluminum (Al) | 0.40 max | Enhances oxidation resistance |
| Cobalt (Co) | 1.0 max | Limited to nuclear applications |
| Carbon (C) | 0.10 max | Low for weldability & corrosion resistance |
| Property | Metric (MPa) | Imperial (KSI) | Notes |
|---|---|---|---|
| Tensile Strength (min) | 827 MPa | 120 KSI | Consistent across bar, sheet, plate & tube |
| Yield Strength 0.2% Offset (min) | 414 MPa | 60 KSI | High strength without heat treatment |
| Elongation (min) | 30% (Bar/Sheet) 35% (Tube) |
- | Excellent ductility for forming |
| Hardness (Bar, Annealed) | ≤ 287 HB | - | Good machinability |
| Hardness (Sheet, Annealed) | 145 - 240 HB | - | |
| Density | 8.44 g/cm³ | 0.305 lb/in³ | |
| Melting Range | 1290 - 1350 °C | 2350 - 2460 °F | |
| Modulus of Elasticity | 207 GPa | 30,000 KSI | At room temperature |
High-Temperature Tensile Strength (Typical): Alloy 625 retains approximately 50% of its room temperature yield strength at 800°C (1472°F), making it suitable for continuous service in high-temperature environments.
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)
- Direct Mill Pricing: Competitive factory-direct quotes with no intermediary markups
- Large Ready Stock: Sheets, bars, and pipes available for immediate dispatch
- Full Traceability: Every lot comes with an EN 10204 Type 3.1 Mill Test Certificate (MTC)
- Precision Processing: In-house cutting (shear, plasma, waterjet, saw) to your exact dimensions
- Global Logistics: Expert packaging for corrosion-resistant alloys ensures safe, on-time delivery worldwide
Need Inconel 625 sheet, bar, pipe, or custom forgings for your next high-stakes project?
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