Inconel 625 Alloy ASTM Standard Nickel Chromium Molybdenum Alloy
Inconel 625: High-Strength Nickel-Chromium-Molybdenum Alloy With Excellent Resistance To Oxidation And Corrosion
Inconel 625 Alloy
Inconel 625 is a high-performance nickel-chromium-molybdenum alloy renowned for its exceptional resistance to oxidation, corrosion, and high-temperature environments. This alloy combines outstanding mechanical properties with excellent weldability, making it ideal for demanding applications in harsh conditions.
Key Features:
- Superior Corrosion Resistance: Inconel 625 excels in resisting oxidation, carburization, and pitting, even in aggressive environments such as marine and chemical processing.
- High Temperature Stability: The alloy maintains its strength and integrity at temperatures up to 1800°F (982°C), making it suitable for high-temperature applications.
- Mechanical Properties: Offers high tensile strength (up to 965 MPa or 140 ksi) and yield strength (690 MPa or 100 ksi), along with good elongation (minimum 35%), ensuring durability and flexibility in various applications.
- Thermal Conductivity: With a thermal conductivity of approximately 11.7 W/m·K, Inconel 625 provides effective heat distribution and resistance to thermal cycling.
- Fabrication Versatility: Available in various forms including sheets, plates, bars, pipes, and welding wire, accommodating a wide range of industrial and engineering needs.
Applications:
- Aerospace: Used in turbine engines, exhaust systems, and other components exposed to extreme temperatures and corrosive environments.
- Chemical Processing: Ideal for reactors, heat exchangers, and other equipment that encounters harsh chemicals and high temperatures.
- Marine Environments: Suitable for applications in seawater and other corrosive environments where resistance to saltwater is crucial.
Standard Specifications:
- ASTM B443
- ASTM B444
- ASTM B446
Inconel 625 provides a robust combination of high strength, excellent oxidation resistance, and superb weldability, making it a preferred choice for critical applications in extreme conditions.
Here is a detailed composition table for Inconel 625 Alloy:
| Element | Range | Typical Value |
|---|---|---|
| Nickel (Ni) | 58.0 - 63.0% | 60.0% |
| Chromium (Cr) | 20.0 - 23.0% | 21.0% |
| Molybdenum (Mo) | 8.0 - 10.0% | 9.0% |
| Iron (Fe) | ≤5.0% | 4.5% |
| Niobium (Nb) + Tantalum (Ta) | 3.15 - 4.15% | 3.7% |
| Cobalt (Co) | ≤1.0% | 0.5% |
| Manganese (Mn) | ≤0.5% | 0.4% |
| Silicon (Si) | ≤0.5% | 0.3% |
| Carbon (C) | ≤0.1% | 0.05% |
| Sulfur (S) | ≤0.015% | 0.01% |
| Phosphorus (P) | ≤0.015% | 0.01% |
This composition ensures that Inconel 625 provides excellent resistance to oxidation, carburization, and corrosion while maintaining high strength and durability.
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