Inconel 690 (NiCr29Fe) Cold-Rolled Tubes | Stress-Corrosion Cracking Resistant for Nuclear Fuel Assemblies
Inconel 690 rods are composed of a high-chromium nickel alloy renowned for exceptional resistance to various corrosive environments and high-temperature atmospheres. With approximately 30% chromium content, these rods offer outstanding resistance to oxidizing conditions, making them ideal for applications in nuclear power plants, chemical processing, and thermal processing industries. Their robust metallurgical stability and favorable fabrication characteristics ensure reliability and longevity in demanding settings.
Chemical Composition of Inconel 690 Rods
| Element |
Composition (%) |
| Nickel (Ni) |
58.0 min |
| Chromium (Cr) |
27.0–31.0 |
| Iron (Fe) |
7.0–11.0 |
| Manganese (Mn) |
≤1.00 |
| Silicon (Si) |
≤0.50 |
| Carbon (C) |
≤0.05 |
| Sulfur (S) |
≤0.015 |
Mechanical Properties of Inconel 690 Rods
| Property |
Value |
| Tensile Strength |
≥590 MPa |
| Yield Strength (0.2% Offset) |
≥240 MPa |
| Elongation |
≥30% |
Physical Properties of Inconel 690 Rods
| Property |
Value |
| Density |
8.19 g/cm³ |
| Melting Range |
1,340–1,370°C |
| Thermal Conductivity |
13.5 W/m-°C |
| Specific Heat Capacity |
450 J/kg·K |
| Electrical Resistivity |
1.148 µΩ·m |
Applications of Inconel 690 Rods
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Nuclear Power Generation: Utilized in steam generator tubes, baffles, and tubesheets due to excellent resistance to high-temperature water and stress-corrosion cracking.
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Chemical Processing: Ideal for heat exchangers and piping systems handling oxidizing acids and hot gaseous environments.
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Thermal Processing Equipment: Employed in industrial furnaces and heat-treating equipment requiring high-temperature strength and oxidation resistance.
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Aerospace Components: Suitable for jet engine parts and other aerospace applications exposed to extreme temperatures and corrosive conditions.
Frequently Asked Questions about Inconel 690 Rods
Q: What distinguishes Inconel 690 rods from other nickel alloys?
A: Inconel 690 rods have a high chromium content (~30%), providing superior resistance to oxidizing environments and stress-corrosion cracking, especially in high-temperature applications.
Q: Can Inconel 690 rods be welded easily?
A: Yes, Inconel 690 rods exhibit good weldability using conventional welding techniques, making them suitable for complex fabrications.
Q: Are Inconel 690 rods suitable for marine environments?
A: While primarily designed for high-temperature oxidizing conditions, Inconel 690 rods also offer good resistance to aqueous corrosion, making them applicable in certain marine environments.
Inconel 690 rods provide a reliable solution for industries requiring materials that withstand extreme temperatures and corrosive conditions, ensuring performance and durability in critical applications.
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