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ASTM B424 Incoloy 825 Sheet & Plate

Views: 6     Author: Wang     Publish Time: 2025-01-27      Origin: Site

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Incoloy 825 Material Properties

Incoloy alloy 825 (UNS N08825)is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional corrosion resistance in both oxidizing and reducing environments. This nickel alloy is resistant to chloride stress-corrosion cracking and pitting. The addition of titanium stabilizes Incoloy alloy 825 against sensitization in the as-welded condition making the alloy resistant to intergranular attack after exposure to temperatures in a range that would sensitize un-stabilized stainless steels. The fabrication of Incoloy alloy 825 is typical of nickel-base alloys, with material being readily formable and weldable by a variety of techniques.


Incoloy 825 is highly resistant to corrosion. It has a high nickel content, sufficient to resist chloride ion stress corrosion cracking, and a very stable austenite structure. The levels of molybdenum and copper enable the alloy to resist reducing agents and acids. Chromium gives resistance to oxidising conditions, such as nitric acid solutions, nitrates and oxidising salts. The alloy is titanium stabilised to resist pitting and intergranular attack after fabrication, particularly welding, which includes heating in the critical sensitisation temperature range (650°C – 760°C).


ASTM B424 Incoloy 825 Sheets and Plates

Incoloy 825 plate is a module made from nickel, iron, chromium with small additions of copper, molybdenum, and titanium. The Incoloy 825 Plate shows enhanced resistance against corrosion and oxidation across different environmental conditions. The high-end modules of the Inconel 825 Plate show outstanding tolerance against localized attacks incurred due to crevice corrosion and pitting by acids. An 825 Inconel Hot Rolled Plate is processed at high temperatures in mills. The Inconel Alloy 825 Cold Rolled Plate is processed further after the initial hot-rolling process to give it superb hardness, enhanced properties coupled with a superior surface finish. Incoloy 825 sheet is ductile over different temperatures right from cryogenic range to temperatures up to 1000 degrees C. The fabricability of the Inconel 825 sheet allows it to be easily welded and formed within the system.


Chemically, Inconel 825 plate is an alloy that contains 74% Nickel, 15.5% Chromium and 8.0% iron with additions of copper, molybdenum, and titanium, a combination which gives the alloy good heat resisting properties. The content of chromium and molybdenum along with nickel in Werkstoff Nr. 2.4858 plate gives the alloy a high level of resistance to chloride related stress cracking and pitting. For this reason, UNS N08825 plate can be used in high chloride containing environments for e.g. seawater. In an annealed condition, the yield strength of UNS N08825 is about 310 MPa while its hardness value is 35 Rockwell. On the other hand, Inconel 825 plate has a melting range of 1370℃ - 1400℃. While the impact strength of Inconel 825 plate is good at both ambient and at cryogenic temperatures, this property is lowered to a significant content as the alloy is exposed to elevated temperatures beyond a point of 540°C.This is because Alloy 825 plate undergoes microstructural changes at temperatures exceeding 540°C, with the formation of a brittle phase.


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Specification of Inconel 825 sheet

ASME/ASTM Name

ASTM B424 / ASME SB 424

Incoloy 825 Plate size in mm

2000 mm x 4000 mm, 1220 mm x 2440 mm, 1000 mm x 2000 mm, 2000 mm x 2000 mm, 1500 mm x 3000 mm,

Thickness of Standard Plate

0.1 to 12 mm Thick

Most Frequently Used Form

Strip, Flats, Rolls, Ring (Flange), Coils, Foils, Shim Sheet, Blank (Circle), Plain Sheet

Incoloy 825 Plate Different Finish

Cold rolled sheet (CR), 2B, Hot rolled plate (HR), BA NO(8), SATIN (Met with Plastic Coated), 2D,

Hardness Range

Half Hard, Soft, Quarter Hard, Spring Hard, Hard etc


Manufacturing Process and Standards for Incoloy 825 Plate

Raw Material and Steel Making

The creation of Incoloy 825 Plate starts with selecting top-quality raw materials, followed by advanced metallurgical processes. The manufacturing typically involves either the electric furnace or the blast furnace method, followed by vacuum oxygen decarburization. This step is crucial for refining the alloy and ensuring its purity, which is vital for achieving the desired properties.


Heat Treatment and Stabilization

The heat treatment of Incoloy 825 Plate is a critical stage in its production, tailored to enhance its corrosion resistance and mechanical properties. The alloy undergoes solution annealing at high temperatures to dissolve precipitated phases, achieving a homogeneous structure, followed by a stabilization anneal at around 940°C to prevent intergranular corrosion. This process is essential for maintaining the integrity of the alloy when exposed to corrosive environments.


Mechanical Processing

Once heat-treated, Incoloy 825 Plate is shaped and processed mechanically. This includes hot working, performed within a temperature range of 870°C to 1180°C, to shape the alloy while maintaining its mechanical strength and corrosion resistance. The final hot working is optimally carried out between 870°C and 980°C, ensuring the alloy’s structural stability. Rapid cooling methods, such as air cooling or quenching, are employed post-hot working to prevent any sensitization.


Machining and Forming

Incoloy 825 Plate is easy to machine with standard techniques, making it versatile for various applications. Optimal machining characteristics are achieved in the annealed temper. For forming operations, both hot and cold methods are applicable, with specific temperature controls ensuring the desired mechanical properties. Subsequent annealing between 930°C and 980°C, followed by rapid cooling, is recommended to maintain the alloy’s resistance to corrosive attacks.


Applications of Incoloy 825 plate

Uses in Oil and Gas Industry

Incoloy 825 plate is extensively used in the oil and gas industry due to its outstanding resistance to corrosive environments. The alloy’s ability to withstand both oxidizing and reducing conditions makes it ideal for various applications within this sector.


Downhole and Surface Equipment

Incoloy 825 plate is commonly employed in downhole tubing, casing, and wellhead components. These applications require materials that can withstand the extreme conditions of deep wells, such as sour gas and seawater. The alloy’s resistance to stress-corrosion cracking, pitting, and crevice corrosion ensures the longevity and reliability of downhole equipment.


Offshore Production

The offshore oil and gas industry benefits from Incoloy 825 plate’s excellent resistance to marine environments, making it ideal for piping systems, risers, and heat exchangers that combat the corrosive effects of seawater and harsh extraction chemicals.


Chemical Process Equipment

Incoloy 825 plate is highly valued in the chemical processing industry for its ability to withstand aggressive chemical environments. Its outstanding resistance to sulfuric and phosphoric acids makes Incoloy 825 ideal for acid production and handling.


Pickling Equipment

Incoloy 825 plate is also used in pickling tank heaters and other equipment involved in the pickling process, where metals are treated with acid solutions to remove impurities. The alloy’s ability to resist intergranular corrosion and maintain structural integrity under acidic conditions is crucial for these applications.


Power Generation

In the power generation industry, Incoloy 825 plate is utilized in both nuclear and fossil fuel plants due to its high-temperature strength and corrosion resistance. The alloy’s versatility allows it to perform reliably in various demanding environments within power generation facilities.


Incoloy 825 plate is used in marine industry components like exhaust systems and propeller shafts, as well as in aerospace applications, due to its robust performance in high-stress, corrosive conditions. In the food and water processing industries, it is applied in hot vessels for processing, ensuring durability and safety. The alloy is also commonly used in heat exchangers, extraction columns, mixing tanks, pipes, pumps, and valves, providing reliable performance and longevity in these critical industrial components.

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