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Nov 7 2024UNS N08028 (Alloy 28, W.Nr. 1.4563, 28Cr), a cold hardened nickel-based alloy, is engineered to excel in demanding environments where corrosion resistance is paramount. Composed of nickel, chromium, and molybdenum, Alloy 28 showcases exceptional resistance to a wide range of corrosive substances, including sulfuric acid, phosphoric acid, and seawater. This alloy's unique composition offers superb weldability, making it ideal for various industrial applications such as chemical processing, marine environments, and nuclear power plants.
Chemical Processing: Chemical storage tanks, processing vessels, pumps, and valves
Oil and Gas Industry: Downhole tubing, pipelines, heat exchangers, and valves
Pharmaceutical Industry: Pharmaceutical reactors, mixing tanks, and pharmaceutical-grade piping systems
Pulp and Paper Industry: Digesters, bleach towers, evaporators, and pulp washing equipment
Desalination Plants: Pumps, evaporators, and heat exchangers handling seawater
Power Generation: Steam generators, gas turbines, heat exchangers, and boiler feedwater systems in power plants
Food and Beverage Industry: Food processing tanks, piping systems, and heat exchangers
Marine Engineering: ISeawater cooling systems, ship components, and desalination equipment
Nuclear Industry: Nuclear reactor components, fuel processing equipment, and storage tanks
Environmental Engineering: Pollution control devices, wastewater treatment equipment, and chemical handling systems
|
Material |
Fe |
Ni |
Cu |
Cr |
Mo |
C |
Mn |
Si |
|
Balance |
30.0-34.0 |
0.6-1.4 |
26.0-28.0 |
3.0-4.0 |
≤0.03 |
≤2.5 |
≤1.0 |
|
Material |
Tensile strength |
Yield strength 0,2 |
Elongation |
Hardness HB30 |
|
N08028 |
500-750 N/mm² |
220 N/mm² |
40% |
230HB |
Alloy 28 is renowned for its exceptional corrosion resistance in diverse environments. It withstands a wide array of acids like sulfuric, phosphoric, and nitric acid, making it ideal for chemical processing. With good resistance to chloride solutions and localized corrosion forms such as pitting and crevice corrosion, Alloy 28 is a reliable choice for industries requiring durability in harsh conditions, including marine applications, desalination plants, and high-temperature environments like power generation plants. Its resistance to stress corrosion cracking and intergranular corrosion further solidifies its reputation as a robust and long-lasting material for critical applications.
Alloy 28 typically undergoes a solution annealing heat treatment process to enhance its mechanical properties and corrosion resistance. This treatment involves heating the alloy to a specific temperature range, followed by rapid cooling. The solution annealing helps in dissolving any precipitates and restoring the alloy's microstructure to achieve desired properties. Subsequent to the annealing process, Alloy 28 may undergo a stabilization treatment to minimize the risk of intergranular corrosion. Proper heat treatment of Alloy 28 is crucial to ensure optimal performance and longevity in various demanding applications where corrosion resistance and mechanical strength are paramount.
Heating and pickling processes are crucial steps in preparing Alloy 28 for various industrial applications. Heating is often employed to facilitate shaping, welding, or annealing of the alloy. Controlled heating can help in achieving specific mechanical properties or in forming the alloy into desired shapes.
Pickling, on the other hand, involves the removal of surface oxides and impurities from the alloy using acidic solutions. This process not only cleans the surface but also improves the corrosion resistance of Alloy 28 by eliminating contaminants that could lead to corrosion initiation. Proper heating and pickling procedures are essential to ensure the quality, performance, and longevity of Alloy 28 in corrosive and demanding environments.
In hot forming, Alloy 28 can be easily shaped at elevated temperatures, allowing for complex geometries and precise molding of the alloy. This process is typically used for applications requiring intricate designs or where high forming temperatures are necessary.
Cold forming of Alloy 28 involves shaping the alloy at room temperature or slightly elevated temperatures. This process is employed for simpler shapes and components, providing excellent dimensional accuracy and surface finish. Cold forming is ideal for applications where the mechanical properties and corrosion resistance of the alloy need to be maintained.
Machining Alloy 28 demands precision and care. Optimal results are achieved with carbide tools, proper cooling/lubrication, and controlled cutting speeds/feeds to prevent work hardening. Its excellent machinability makes it a preferred choice for components in chemical processing, oil and gas, and marine applications. Adhering to best practices ensures efficient production and high-quality finished products, leveraging Alloy 28's corrosion resistance and mechanical properties for various industrial needs.
Welding Alloy 28 requires attention to detail. This alloy, known for its excellent weldability, typically demands matching filler materials to maintain corrosion resistance. Preheating and post-weld heat treatments may be necessary to prevent sensitization and ensure optimal mechanical properties. Common welding methods like TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) are often used for Alloy 28, enabling its application in diverse industries such as chemical processing, oil and gas, and marine engineering, where reliable welded joints are essential for structural integrity and performance.
Ø Bar & Rod
Ø Plate & Sheet
Ø Coil & Strip
Ø Pipe & Tube
Ø Fitting: Flange, Tee, Elbow, Reducer etc.
Ø Forging: Ring, Shaft, Circle, Block etc.
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