Inconel 625 (UNS N06625) Spectacle Blind for Sour Gas, Offshore Oil & Gas, Seawater and Corrosive Chemical Service
ASME B16.48 Inconel 625 (UNS N06625) Spectacle Blind
Inconel 625 (UNS N06625) Spectacle Blind is a high-performance nickel-based alloy piping component designed for demanding sour gas, offshore oil & gas, seawater and corrosive chemical service. Manufactured from Inconel 625, it offers excellent resistance to pitting, crevice corrosion, chloride-induced corrosion and stress corrosion cracking, together with high strength and reliable performance in harsh environments. The spectacle blind provides a practical solution for positive isolation and flow control in critical piping systems.
Key Features
- Resists pitting, crevice corrosion and chloride corrosion.
- Suitable for sour gas and H₂S-containing environments.
- Provides reliable strength for high-pressure piping systems.
- Performs well in seawater and offshore environments.
- Provides positive isolation for maintenance and shutdown operations.
Typical Applications
- Sour Gas Pipelines: Acid gas and H₂S-containing piping systems.
- Offshore Oil & Gas: Offshore platforms, subsea and oil & gas piping systems.
- Seawater Systems: Seawater intake, cooling and desalination systems.
- Chemical Processing: Corrosive chemical processing and transfer pipelines.
- Petrochemical Plants: High-pressure and corrosive-service piping systems.
Chemical Composition (wt%)
| Element | Ni | Cr | Mo | Nb + Ta | Fe | C | Mn | Co | Si | Al | P |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Range | ≥58.0 | 20.0–23.0 | 8.0–10.0 | 3.15–4.15 | ≤5.0 | ≤0.10 | ≤0.50 | ≤1.0 | ≤0.50 | ≤0.40 | ≤0.015 |
Mechanical Properties (Solution Annealed)
| Property | Value |
|---|---|
| Tensile Strength (Rm) | ≥ 827 MPa (120 ksi) |
| Yield Strength (Rp0.2) | ≥ 414 MPa (60 ksi) |
| Elongation (A5) | ≥ 30 % |
| Density | 8.44 g/cm³ |
| Hardness | ≤220 HBW |
| Modulus of Elasticity | 207 GPa |
| Max Service Temperature | ≤ 649°C (1200°F) |
Precautions
- Confirm size, pressure rating and material before installation.
- Ensure temperature, pressure and media are suitable.
- Follow applicable NACE MR0175 / ISO 15156 requirements for H₂S service.
- Check for damage, deformation and dimensional conformity.
Quality Assurance
Inconel 625 (UNS N06625) Spectacle Blinds are manufactured from forgings compliant with ASTM B564 and qualified for demanding sour-gas, offshore oil & gas, seawater, and corrosive service applications. Fully inspected and tested, including PT, UT, tensile, hardness, PMI/OES, and dimensional checks, they are provided with full material traceability, comprehensive MTRs, heat-treatment records, and NDT reports.
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