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Short Description:
Alloy 690 is a high-chromium nickel alloy that exhibits excellent resistance to many corrosive aqueous media and high temperature environments. It has good fabrication characteristics, metallurgical stability and high strength.However, the alloy shows excellent resistance to stress-corrosion cracking and low corrosion rates under various high-temperature solutions.
Product Description
Inconel 690 is a high-chromium-content version of Inconel alloy 600 with excellent resistance to many oxidising acids and salts and some resistance to sulfidation at elevated temperatures. The substantial chromium content gives the alloy outstanding resistance to oxidizing chemicals and to high-temperature oxidizing gases. The high level of nickel imparts resistance to stress corrosion cracking in chloride-containing environments as well as to sodium hydroxide solutions.
The properties of INCONEL alloy 690 are useful for various applications involving nitric or hydrofluoric acid solutions. Examples are tail-gas reheaters used in nitric acid production and heating coils and tanks for nitric and hydrofluoric solutions used in the pickling of stainless steel and the reprocessing of nuclear fuels.
The alloy’s resistance to sulfur-containing gases makes it an attractive material for such applications as coal-gasification units, burners and ducts for processing sulfuric acid, furnaces for petrochemical processing, recuperators, incinerators, and glass vitrification equipment for radioactive waste disposal.
In various types of high-temperature water, alloy 690 displays low corrosion rates and excellent resistance to stress-corrosion cracking. Thus, alloy 690 is widely used for steam generator tubes, baffles, tubesheets, and hardware in nuclear power generation.
Inconel 690 alloy is surface treated by laser melting technology, which can improve its surface properties. It also has good corrosion resistance and high strength as a steam generator heat transfer tube material in pressurized water reactor power stations. It can not only resist the occurrence of intergranular corrosion but also resist the development of intergranular stress corrosion cracking to ensure the reliable operation of the equipment.
Inconel 690 Characteristic：
- Excellent inoxidability in the high temperature.
- Good resistance to carbonizing.
- Good inoxidabilitiy in sulfur atmosphere
- Good mechanical property in both room temperature and high temperature.
- Good resistance to stress corrosion cracking, 690 have high creep rupture strength since it limits the carbon content and grain size, so recommend to use for above 500℃ environment.
Inconel 690 Chemical Composition
| % | Ni | Cr | Fe | C | Mn | Si | Cu | S | P |
|---|---|---|---|---|---|---|---|---|---|
| Min. | 58 | 27 | 7 | - | - | - | - | - | - |
| Max. | - | 31 | 11 | 0.05 | 0.5 | 0.5 | 0.5 | 0.015 | 0.02 |
Inconel 690 Physical Properties
| Density | Melting range |
|---|---|
| 8.19 g/cm³ | 1343-1367°C |
Inconel 690 Mechanical Properties (Minimum value at 20℃)
| Tensile Strength (σb/MPa) | Yield Strength (σp0.2/MPa) | Elongation (σ5/%) |
|---|---|---|
| 580 | 260 | 30 |
- Bars & Rods & Foring Ring /Flanges
- Sheet & Plate
- Strip & Coil
- Welding Wire &Spring wire
- Seamless Tube & Welded Pipe
»Round Bar & Square Bar & Hexagon Bar
● Diameter : φ8～φ300mm Length:10mm-6000mm
● Hot forging, Hot Rolling, Cold Drawing
● Bright Surface, Polished Surface, Black Surface
»Tube & Pipe:Seamless Tube& Welded Pipe
● Cold Drawing Seamless Pipe： φ1.0～φ220mm
● Hot Extrusion pipe: φ50～φ250mm
● Others : U Blend Tube and Elbow
»Hot Rolled Plate & Cold Rolled Sheet
● Cold Rolling Sheet Thickness: ≦2.0mm Width:≦1500m
● Hot rolling Plate Thickness: ≧4.0mm Width: ≦2500m
»Strip & Tape Ribbon
● Thickness: ≧ 0.01mm Width: 15mm-300mm
● Cold rolling BA Strip, Hard & Soft Condition
»Straight Length Wire & Spool Wire
● Welding Wire: φ 0.1mm～6.0mm Cut length Rod: φ1.0～φ8.0mm
● Package : 5-25kg/Spool or Box
Alloy 690 Applications
- The tray,basket and tool clamp in the heat treatment factory.
- Steel shares at annealing and radiation control, high-speed gas burners, Industrial furnace silk screen.
- Separate tank of ammonia reforming and catalytic support grid of nitric acid producing.
- Exhaust system parts
- Solid waste incinerator’s combustion chamber
- Channel support and soot dealing parts.
Introducing Alloy 690 is a high-performance nickel-chromium alloy designed to thrive in the most demanding environments. Engineered with precision and innovation, this alloy stands out for its remarkable corrosion resistance, making it a top choice for applications where durability and reliability are paramount.
Key Features:
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Corrosion Resistance: Alloy 690 is celebrated for its exceptional corrosion resistance in a wide range of aggressive environments. From acidic to alkaline conditions, this alloy remains steadfast, making it ideal for applications where exposure to corrosive elements is a constant challenge.
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High-Temperature Stability: Designed to withstand elevated temperatures, Alloy 690 maintains its structural integrity even in the most demanding heat-intensive environments. This property makes it particularly well-suited for applications in industries such as chemical processing, nuclear power generation, and thermal processing.
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Versatility: With a versatile range of applications, Alloy 690 is a go-to choice for various industries, including chemical processing, petrochemicals, nuclear power, and aerospace. Its adaptability to diverse conditions and its ability to resist corrosion in both oxidizing and reducing environments make it a reliable solution for critical applications.
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Excellent Weldability: Alloy 690 is crafted with weldability in mind. It lends itself well to various welding processes, ensuring ease of fabrication and installation. This feature contributes to reduced downtime during construction or maintenance activities.
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Long-Term Performance: The longevity of Alloy 690 is a testament to its robust design. This alloy exhibits excellent resistance to stress corrosion cracking and corrosion fatigue, ensuring a prolonged service life even under challenging operational conditions.
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Compliance with Industry Standards: Alloy 690 complies with stringent industry standards, meeting or exceeding expectations for quality and performance. Its adherence to specifications makes it a trusted choice for critical applications where compliance is non-negotiable.
Applications:
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Chemical Processing: Alloy 690’s corrosion resistance and high-temperature stability make it a preferred material for equipment used in aggressive chemical processing environments.
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Nuclear Power Generation: In the nuclear industry, where reliability and durability are paramount, Alloy 690 finds applications in components exposed to extreme conditions, such as steam generators and reactor core components.
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Aerospace: The aerospace industry benefits from Alloy 690’s ability to withstand high temperatures and corrosive atmospheres, making it suitable for components in aircraft engines and propulsion systems.
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Petrochemical Industry: Alloy 690 is a staple in the petrochemical sector, where it plays a crucial role in resisting corrosion in equipment used for refining and processing.
Alloy 690 is more than just a material; it’s a reliable solution for industries where uncompromised performance is a necessity. From its impeccable corrosion resistance to its ability to endure high temperatures, this alloy sets the standard for durability and longevity. Choose Alloy 690 for applications that demand the utmost in reliability and performance.