UNS N10276 Nickel Alloy Corrosion Resistant High Performance
UNS N10276 is a nickel-molybdenum-chromium alloy with the addition of tungsten, widely recognized as the most versatile corrosion-resistant alloy available today. It exhibits exceptional resistance to a wide range of aggressive media, including strong oxidizing and reducing acids, chlorides, and wet chlorine gas.
Unlike many corrosion-resistant alloys, UNS N10276 retains excellent mechanical properties and corrosion resistance in the as-welded condition, requiring no post-weld heat treatment. This makes it the industry standard for chemical processing, pollution control, and other severe service applications where both corrosion resistance and fabricability are critical.
| Parameter | Details |
|---|---|
| Standard | ASTM B622 (Seamless Tube), ASTM B619 (Welded Tube), ASTM B574 (Bar), ASME SB622 |
| Grade / UNS | UNS N10276 |
| 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 |
| Ends | Plain end / Beveled end / Threaded |
| Packaging | Hexagonal bundles + plastic end caps + seaworthy wooden crates or pallets |
| Marking | Grade + Size + Heat No. + Standard |
The chemical composition of UNS N10276 complies with ASTM B575, B574, and B622 standards. The extremely low carbon content (≤0.01%) distinguishes UNS N10276 from earlier C-type alloys.
| Element | Content (%) | Role |
|---|---|---|
| Nickel (Ni) | Balance (≥52%) | Provides SCC resistance and austenitic stability |
| Chromium (Cr) | 14.5 – 16.5 | Enhances oxidation and corrosion resistance |
| Molybdenum (Mo) | 15.0 – 17.0 | Provides resistance to reducing acids and pitting |
| Tungsten (W) | 3.0 – 4.5 | Further enhances localized corrosion resistance |
| Iron (Fe) | 4.0 – 7.0 | Improves metallurgical stability |
| Cobalt (Co) | ≤ 2.5 | Residual element |
| Manganese (Mn) | ≤ 1.00 | Aids in hot workability |
| Vanadium (V) | ≤ 0.35 | Trace element |
| Silicon (Si) | ≤ 0.08 | Improves oxidation resistance (controlled to a low level) |
| Carbon (C) | ≤ 0.01 | Key feature – prevents intergranular attack |
| Phosphorus (P) | ≤ 0.04 | Minimized to maintain ductility |
| Sulfur (S) | ≤ 0.03 | Controlled for hot workability |
Actual mill test certificates (EN 10204 3.1) available per batch.
| Property | Metric (MPa) | Imperial (ksi) |
|---|---|---|
| Tensile Strength (Rm) | ≥ 690 | ≥ 100 |
| Yield Strength 0.2% Proof (Rp0.2) | ≥ 283 | ≥ 41 |
| Elongation (A) | ≥ 40% | ≥ 40% |
| Hardness (HRB) | ≤ 100 | ≤ 100 |
| Density | 8.89 g/cm³ | 0.321 lb/in³ |
| Melting Point | 1325 – 1370°C | 2417 – 2500°F |
| Modulus of Elasticity | 205 GPa | 29.7 x 10³ ksi |
| Specific Heat | 425 J/kg·K | — |
| Thermal Conductivity | 11.2 W/m·K (at 20°C) | — |
| Temperature | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| -196°C (-321°F) | 965 | 565 | 45 |
| 21°C (70°F) | 790 | 415 | 50 |
| 93°C (200°F) | 725 | 380 | 50 |
| 204°C (400°F) | 710 | 345 | 50 |
| 316°C (600°F) | 675 | 315 | 55 |
| 427°C (800°F) | 655 | 290 | 60 |
| 538°C (1000°F) | 640 | 270 | 60 |
*Note: UNS N10276 retains good ductility even at cryogenic temperatures, making it suitable for low-temperature services.*
- Solution annealed condition: -200°C to +400°C (-330°F to +750°F) for continuous service
| Feature | Benefit |
|---|---|
| Exceptional corrosion resistance | Resists oxidizing & reducing acids, chlorides, wet chlorine |
| As-welded performance | No post-weld heat treatment required |
| Pitting & crevice resistance | Outstanding in chloride-containing media |
| Stress corrosion cracking | Excellent resistance |
| Low carbon content (0.010%) | Prevents intergranular attack |
| Fabrication friendly | Readily welded and formed |
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