ASTM B637 Inconel 718 (UNS N07718) Nickel Alloy Valve Stem for Oil & Gas, Offshore, Chemical Processing and High Pressure Valve Applications
Inconel 718 Nickel Alloy Valve Stem for Severe Corrosion Environments and High Pressure Control Valves
ASTM B637 Inconel 718 (UNS N07718) nickel alloy valve stems are made from precipitation-hardened nickel alloy, featuring high strength, excellent corrosion resistance, fatigue resistance, and dimensional stability. They are designed for high-pressure, high-temperature, and severe service conditions, widely used in oil & gas, offshore, chemical processing, and industrial valve applications.
Key Features
- High strength and excellent mechanical properties.
- Excellent corrosion and oxidation resistance.
- Excellent high-temperature strength and creep resistance.
- Outstanding fatigue resistance and long service life.
- Excellent dimensional stability after heat treatment.
- Suitable for high-pressure, high-temperature, and severe service conditions.
- Precision machining ensures reliable sealing and stable operation.
Typical Applications
- High-pressure oil & gas valves and wellhead equipment
- Offshore platforms and subsea valve systems
- Chemical processing equipment and corrosion-resistant valves
- Critical valve components for petrochemical and energy industries
- High-temperature and high-pressure industrial control valve systems
- Aerospace and special engineering equipment
Chemical Composition (wt%)
| Element | Ni | Cr | Fe | Nb + Ta | Mo | Ti | Al | Co | C | Mn | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Range | 50.00–55.00 | 17.00–21.00 | Balance | 4.75–5.50 | 2.80–3.30 | 0.65–1.15 | 0.20–0.80 | ≤1.00 | ≤0.08 | ≤0.35 | ≤0.015 |
Mechanical Properties (Solution Annealed + Age Hardened)
| Property | Value |
|---|---|
| Tensile Strength (Rm) | ≥ 1276 MPa (185 ksi) |
| Yield Strength (Rp0.2) | ≥ 1034 MPa (150 ksi) |
| Elongation (A5) | ≥ 12 % |
| Density | 8.19 g/cm³ |
| Hardness | 36 ~ 45 HRC |
| Modulus of Elasticity | 200 GPa |
| Max Service Temperature | ≤ 650°C(1200°F) |
Precautions
- Select suitable operating temperature, pressure, and service conditions.
- Avoid work hardening and maintain dimensional accuracy during machining.
- Protect surface quality during installation to ensure sealing performance.
- Monitor performance changes during long-term high-temperature service.
Quality Assurance
All DINGSCO Inconel 718 (UNS N07718) valve stems are manufactured in accordance with ASTM B637 and are suitable for API 6A high-pressure valve applications. Inspections include PT (ASTM E165/E165M), UT (ASTM A388), tensile testing (ASTM E8/E8M), OES chemical analysis, PMI, hardness testing (ASTM E18), and dimensional verification. Full material traceability is maintained throughout the manufacturing process, with MTRs, heat-treatment records, and NDT reports available upon request.
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