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Incoloy 825 Butt Weld Fittings | UNS N08825 | Tailan Metal
Incoloy 825 UNS N08825 butt weld fittings to ASME SB-564 and B16.9. Ni-Fe-Cr-Mo-Cu alloy for sulphuric acid and sour gas service. EN 10204 3.1 cert.
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Incoloy 825 (UNS N08825) is a nickel-iron-chromium-molybdenum-copper alloy built for sulphuric acid, phosphoric acid and sour gas service where Inconel 625 alone is not economical. Tailan Metal supplies it as butt weld fittings to ASME SB-564 for material and ASME B16.9 for dimensions, in elbow, tee, reducer, cap, stub end and lap-joint configurations.
Grade comparison
| Grade | UNS | Key composition | Typical buyer driver |
|---|---|---|---|
| Incoloy 825 | N08825 | Ni 38.0-46.0 / Cr 19.5-23.5 / Mo 7.0-9.0 / Cu 1.5-3.0 | Sulphuric acid, sour gas |
| Incoloy 800 | N08800 | Ni 30.0-35.0 / Cr 19.0-23.0 | High-temperature strength |
| Inconel 625 | N06625 | Ni 58.0 min / Cr 20.0-23.0 / Mo 8.0-10.0 / Nb 3.15-4.15 | General corrosion, NACE MR0175 |
| Hastelloy C-276 | N10276 | Ni-Cr-Mo-W, low carbon | Wet chlorine, oxidising acids |
Product range and specification
Butt weld elbows 90 and 45 degree long radius (ASME B16.9), concentric and eccentric reducers, equal and reducing tees, caps, 180 degree bends, lap-joint stub ends. Size range DN 15 (1/2 in.) to DN 600 (24 in.), wall thickness to suit schedule or customer drawing. Forgings supplied annealed; other heat-treatment conditions on request.
Material specification – ASME SB-564, Table 1
| Element | Limit (%), max unless range given |
|---|---|
| Nickel | 38.0-46.0 |
| Copper | 1.5-3.0 |
| Iron | 22.0 min (by difference) |
| Manganese | 1.0 |
| Carbon | 0.05 |
| Silicon | 0.5 |
| Sulfur | 0.03 |
| Chromium | 19.5-23.5 |
| Aluminium | 0.2 |
| Titanium | 0.6-1.2 |
Mechanical properties – ASME SB-564, Table 2 (annealed)
| Property | Value |
|---|---|
| Tensile strength | 85 ksi (586 MPa) min |
| Yield strength | 35 ksi (241 MPa) min |
| Elongation in 2 in. (50 mm) | 30% min |
Applications
Sulphuric and phosphoric acid plant, oil and gas gathering systems operating with hydrogen sulphide, sour water stripping units, pulp and paper digesters, and chemical process lines where chloride stress corrosion cracking rules out 316L.
Certification and inspection
EN 10204 3.1 / 3.2 mill certificate, hydrostatic shell test, PMI (positive material identification) on request, intergranular corrosion test to ASTM G28 when specified, and NACE MR0175 / ISO 15156 compliance on request. Dimensional inspection to ASME B16.9 with MTR traceability by heat number.
Ordering information
Send size, schedule or wall thickness, grade (825 or 825 transition to 625), quantity, and applicable standard. We will confirm dimensional availability, mill certificate type and lead time with a quotation. Non-standard angles, thick-wall forged fittings and special corrosion-test packages can be quoted on request.
