Incoloy 825 (UNS N08825) Nickel Alloy Seat Ring for Oil & Gas, Chemical Processing, Offshore and Corrosive Service Valves
Incoloy 825 (UNS N08825) Corrosion Resistant Valve Seat Ring
Incoloy 825 (UNS N08825) nickel alloy seat rings are manufactured from a nickel-iron-chromium corrosion-resistant alloy, offering excellent resistance to acidic environments, pitting, crevice corrosion and stress corrosion cracking. Precision machining provides accurate dimensions and reliable sealing fit, making them suitable for ball valves, gate valves and other valve applications in oil & gas, chemical processing, offshore engineering and highly corrosive service environments.
Key Features
- Excellent resistance to pitting and crevice corrosion.
- Precision machining for accurate dimensions.
- Reliable sealing and mating performance.
- Suitable for highly corrosive service environments.
- Good mechanical strength and durability.
- Customized dimensions and designs available.
Typical Applications
- Used in wellhead, pipeline and pressure control systems.
- Used in valves handling corrosive process fluids.
- Suitable for acidic and highly corrosive media.
- Suitable for seawater and chloride-containing environments.
- Used in acid transfer and fluid control systems.
- Used as critical sealing and seating components.
Chemical Composition (wt%)
| Element | Ni | Cr | Fe | Cu | Mo | Ti | C | Mn | Si | Al | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Range | 38.0–46.0 | 19.5–23.5 | ≥22.0 | 1.5–3.0 | 2.5–3.5 | 0.6–1.2 | ≤0.05 | ≤1.0 | ≤0.5 | ≤0.2 | ≤0.03 |
Mechanical Properties (Solution Annealed + Precision Machined)
| Property | Value |
|---|---|
| Tensile Strength (Rm) | ≥ 586 MPa (85 ksi) |
| Yield Strength (Rp0.2) | ≥ 241 MPa (35 ksi) |
| Elongation (A5) | ≥ 30 % |
| Density | 8.14 g/cm³ |
| Hardness | ≤100 HRB |
| Modulus of Elasticity | 196 GPa |
| Max Service Temperature | ≤ 540°C(1000°F) |
Precautions
- Control machining parameters to prevent work hardening.
- Prevent contamination from iron particles, carbon steel, and other foreign materials.
- Ensure sealing surface dimensions, concentricity, and surface finish meet requirements.
- Control assembly clearances to prevent sticking or leakage.
- Conduct final inspection and maintain material traceability with MTRs and inspection records.
Quality Assurance
Incoloy 825 (UNS N08825) seat rings are forged per ASTM B564 for API 6A sour‑service valves, NACE MR0175 compliant. Inspection scope covers PT, UT, tensile test, OES, PMI, hardness and dimensional check. Complete material traceability is ensured; MTR, heat‑treatment and NDT reports are available on request.
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