Inconel 690 is a high-performance material known for its corrosion resistance. Standard stainless steel pipes and stainless steel pipe fittings often lack the durability needed, especially in corrosive environments. And that’s where Inconel 690 alloy offers an excellent solution.
What is Inconel 690 | UNS N06690 | GB/T 15059
Inconel 690 is a nickel-chromium-iron alloy. It is a solid solution strengthened material with a very high chromium content (27-31%), resulting in excellent wear resistance. It is resistant to oxidizing and reducing environments.
Key Strengths of Inconel 690
Inconel 690 alloys are resistant to a wide range of corrosive media, as well as oxidizing acids and high-purity water.
This alloy maintains its mechanical strength at high temperatures, providing reliable performance and resistance to creep deformation.
Its high nickel content prevents stress corrosion cracking and also prevents sudden brittle fracture.
Inconel 690 alloy is easy to mold and easy to weld. This simplifies the process of complex fabrication.
Chemical Composition
| Element | Ni | Cr | Fe | C | Si | Mn | Ti | Al |
|---|---|---|---|---|---|---|---|---|
| Content (wt%) | Balance | 27.0-31.0 | 7.0-11.0 | 0.05 Max | 0.50 Max | 0.50 Max | 0.50 Max | 0.50 Max |
Mechanical Properties
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness | Density | Melting Range |
|---|---|---|---|---|---|---|
| Value (Typical) | ≥520MPa(75.4ksi) | ≥205MPa(29.7ksi) | ≥35 | ≤200 | 8.19g/cm³ | 1340−1375 ℃ |
Inconel 690 in High Temperature Piping Systems
- Nuclear: The nuclear industry is unique and places a high value on safety, Inconel 690 is resistant to stress corrosion cracking and can be used in steam generator piping to handle high purity water.
- Waste treatment: Inconel 690 can withstand highly corrosive environments and can be used to treat nuclear waste.
- Chemical Processing: Used in nitric acid and sulfur production because of its resistance to oxidizing acids.
- Power Generation: Heat exchangers require extreme strength and must be able to withstand thermal cycling.
- Piping systems: Critical stainless steel fittings require extreme corrosion resistance, and Inconel 690 ensures the integrity and reliability of piping systems.
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Sourcing and Fabricating Inconel 690
A complete Material Test Report (MTR) is required. It verifies the precise composition of the alloy and ensures its performance.
Work with specialized suppliers of stainless steel pipe and fittings. They understand these alloy steels and can ensure proper fabrication and quality control,and are ISO 9001 and CE-PED certified.
It is difficult to machine and requires special tools. Specific welding techniques are essential to ensure the integrity of the weld.
It is expensive, so it is important to assess whether the product has a longer service life. This can justify its higher initial cost.
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