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Inconel 690 (UNS N06690 / Alloy 690 / W.Nr. 2.4642) is a high-chromium nickel alloy developed specifically to resist stress corrosion cracking in high-temperature aqueous environments. The alloy contains a minimum of 58% nickel, 27–31% chromium—significantly higher than Inconel 600's 14–17%—and 7–11% iron. This elevated chromium content provides superior resistance to oxidizing chemicals and hot gases, while the high nickel content ensures protection against chloride-induced stress corrosion cracking and caustic environments. Defined by ASTM B167 for seamless pipe and tube, ASTM B168 for plate and sheet, and ASTM B166 for bar, Inconel 690 is the preferred material for nuclear steam generators, chemical processing, heat exchangers, power generation, and petrochemical industry applications. Available in a full range of product forms including Inconel 690 seamless pipe, tube, plate, sheet, round bar, wire, and forgings.
Composition（%） | C | Si | Mn | Fe | S | Cr | Ni | Cu |
Min | \ | \ | \ | 7.0 | \ | 27.0 | 58 | \ |
Max | 0.05 | 0.5 | 0.5 | 11.0 | 0.015 | 31.0 | \ | 0.5 |
Rigidity | Tensile strength | Yield strength | Elongation |
85HRB | ≥700MPa | ≥350MPa | ≥45% |
Density | Melting points | Specific heat | Magnetism | Resistivity | Thermal conductivity | Linear expansivity |
7.19g/cm3 | 1344-1377℃ | 455J/(Kg.℃） | \ | 12.1λ/(W(m•℃) | 9.2W/(m.k)(20℃) | 14.0×10-6/K(20-100℃) |
1. Nuclear Power Equipment
One of the most important applications of Inconel 690 Alloy is nuclear power equipment, especially components exposed to high temperature water and steam environments.
Typical applications include:
Steam generator tubing
Heat exchanger tubing
Nuclear power plant components
Pressure boundary components
The combination of chromium content and nickel-based structure makes Inconel 690 Tube suitable for long-term service where corrosion resistance is a primary concern.
2. Chemical Processing Equipment
In chemical industries, materials must withstand acids, high temperature fluids, and continuous operation conditions.
Inconel 690 Pipe and Tube are commonly considered for:
Chemical processing equipment
Heat exchangers
Reaction vessels
High temperature process piping
Its corrosion resistance helps improve equipment reliability and reduce maintenance requirements.
3. Heat Exchanger and Thermal Equipment
For heat transfer equipment operating under elevated temperatures, Inconel 690 Seamless Tube offers excellent resistance against oxidation and thermal degradation.
Typical applications include:
Heat exchanger tubes
Steam system components
High temperature processing equipment
Industrial heating systems
Mono Group supplies Inconel 690 Nickel Alloy products according to different engineering requirements, including ASTM/ASME standards and customized dimensions.
| Product Form | Typical Standards / Specifications | Available Supply |
Inconel 690 Tube | ASTM B163, ASTM B167, ASME SB163 | Seamless Tube, Heat Exchanger Tube |
Inconel 690 Pipe | ASTM B829, ASTM B407 (where applicable) | Seamless Pipe, Custom Sizes |
Inconel 690 Plate & Sheet | ASTM B168, ASME SB168 | Plate, Sheet, Strip |
Inconel 690 Bar | ASTM B408, ASME SB408 | Round Bar, Rod |
Inconel 690 Forgings | ASTM B564 | Forged Components |
Common specifications include:
UNS N06690 Material
Inconel 690 Chemical Composition
Inconel 690 Mechanical Properties
Inconel 690 Heat Treatment
Inconel 690 Equivalent Material
Custom dimensions and tolerances
The main reason engineers select Inconel 690 Superalloy is its balanced performance in high temperature and corrosive environments.
Key properties include:
High chromium content for excellent oxidation resistance
Strong resistance to chloride stress corrosion cracking
Good thermal stability at elevated temperatures
High strength retention during long-term service
Good weldability for fabricated equipment
These characteristics make Heat Resistant Nickel Alloy materials like Inconel 690 suitable for demanding industrial applications where standard stainless steels may not provide sufficient service life.
Mono Group supports global customers requiring reliable nickel alloy sourcing for industrial and engineering applications.
Our advantages include:
Supply of Inconel 690 Nickel Alloy in multiple product forms
Support for ASTM and ASME standard requirements
Customized sizes for project applications
Experience supplying corrosion resistant alloys for industrial equipment
Flexible sourcing capability for special nickel alloys
Whether you need Inconel 690 Tube, plate, bar, or forged products, Mono Group can provide suitable material solutions based on your project requirements.
Q: What is Inconel 690 Alloy used for?
A: Inconel 690 Alloy is mainly used for nuclear power equipment, heat exchangers, chemical processing systems, and high temperature corrosion resistant applications.
Q: What is the difference between Inconel 690 and stainless steel?
A: Compared with stainless steel, Inconel 690 Nickel Alloy provides higher corrosion resistance, especially in high temperature water, steam, and aggressive chemical environments.
Q: What standards are available for Inconel 690 Tube?
A: Common standards include ASTM B163 Inconel 690 Tube and related ASME specifications depending on the application requirements.
Q: Can Mono Group supply custom size Inconel 690 products?
A: Yes. Mono Group can provide customized Inconel 690 Pipe, Tube, Plate, Sheet and Bar according to required dimensions and project specifications.
Q: Is Inconel 690 suitable for heat exchanger applications?
A: Yes. Due to its corrosion resistance and high temperature stability, Inconel 690 Heat Exchanger Tube is widely used in demanding thermal equipment.
If you are sourcing Inconel 690 Tube, Inconel 690 Pipe, Inconel 690 Plate, or other nickel alloy products, please contact Mono Group info@monokj.com for technical support and quotation.
Our team can provide material selection support, specification confirmation, and customized supply solutions for your project requirements.
