Inconel 625 (UNS N06625) Forged Flange for Oil & Gas, Offshore Platforms, Subsea Equipment and Chemical Plants
ASTM B564 Inconel 625 (UNS N06625) Forged Flange for Sour Gas, Offshore Oil & Gas and Corrosive Chemical Service
Inconel 625 (UNS N06625) Forged Flange is a high-performance nickel-based alloy flange designed for demanding oil & gas, offshore platforms, subsea equipment and chemical processing applications. It offers excellent resistance to pitting, crevice corrosion, chloride corrosion and stress corrosion cracking, combined with high mechanical strength and reliable performance in harsh and corrosive environments.
Key Features
- Excellent resistance to pitting, crevice and chloride corrosion.
- Provides high mechanical strength for demanding piping systems.
- Suitable for seawater and marine environments.
- Suitable for demanding oil & gas and H₂S-containing service when properly specified.
- Provides good structural integrity and dimensional stability.
Typical Applications
- Wellhead, pipelines and high-pressure oil & gas equipment.
- Offshore production facilities and marine piping systems.
- Subsea pipelines, manifolds and pressure-control equipment.
- Corrosive chemical processing and transfer systems.
- High-pressure and corrosive-service piping
- Seawater cooling, desalination and marine service systems.
Chemical Composition (wt%)
| Element | Ni | Cr | Mo | Nb + Ta | Fe | Ti | Mn | Co | Si | Al | P |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Range | ≥58.0 | 20.0–23.0 | 8.0–10.0 | 3.15–4.15 | ≤5.0 | ≤0.40 | ≤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 | 205 GPa |
| Max Service Temperature | ≤ 649°C (1200°F) |
Precautions
- Confirm flange size, pressure class, facing and material before installation.
- Verify temperature, pressure and media compatibility.
- Ensure correct alignment, gasket selection and bolt tightening.
- For H₂S service, comply with applicable NACE MR0175 / ISO 15156 requirements.
- Check the flange for damage, deformation and dimensional conformity.
Quality Assurance
Inconel 625 (UNS N06625) Forged Flanges are manufactured in accordance with ASTM B564 and designed for demanding oil & gas sectors, offshore platforms, subsea equipment, chemical processing, 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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