ASTM B424 UNS N08825 Alloy 825 Plates

ASTM B424 UNS N08825 Alloy 825 Plates are specifications for high-performance, corrosion-resistant plates made from Alloy 825. Here's a detailed overview:

 

Common Types:

 

Hot Rolled Plates: Produced by rolling the ingot at high temperatures. They offer good surface finish and dimensional accuracy.

Cold Rolled Plates: Processed at room temperature, resulting in improved surface finish and tighter dimensional tolerances.

Annealed Plates: Heat treated to relieve internal stresses and improve mechanical properties.

Polished Plates: Subjected to mechanical or chemical polishing for enhanced surface smoothness and appearance.

 

Common Sizes:

 

Thickness: 0.1 mm - 50 mm

Width: Up to 2500 mm

Length: Up to 12000 mm

 

Chemical Composition (Typical):

 

Nickel (Ni): 38.0 - 46.0%

Chromium (Cr): 19.5 - 23.5%

Iron (Fe): 22.0% min

Molybdenum (Mo): 2.5 - 3.5%

Copper (Cu): 1.5 - 3.0%

Titanium (Ti): 0.6 - 1.2%

Aluminum (Al): 0.2% max

Manganese (Mn): 1.0% max

Silicon (Si): 0.5% max

Carbon (C): 0.05% max

Sulfur (S): 0.03% max

Phosphorus (P): 0.03% max

 

Mechanical Requirements:

 

Tensile Strength: 85 ksi (586 MPa) min

Yield Strength (0.2% offset): 35 ksi (241 MPa) min

Elongation: 30% min

Hardness: HRB 85 max

 

Applications:

 

Alloy 825 plates find widespread use in industries requiring exceptional corrosion resistance, such as chemical processing, oil and gas, petrochemical, and marine engineering.

Common applications include pressure vessels, heat exchangers, piping systems, tanks, valves, pumps, and other equipment subjected to corrosive environments containing sulfuric acid, phosphoric acid, and chloride solutions.

 

Q&A:

 

Q: What makes Alloy 825 plates suitable for corrosive environments?

A: Alloy 825 offers superior corrosion resistance in a wide range of aggressive media, including sulfuric acid, phosphoric acid, and chloride-containing environments. Its high nickel, chromium, and molybdenum content contribute to its exceptional corrosion resistance.

 

Q: Can Alloy 825 plates be welded?

A: Yes, Alloy 825 is readily weldable using common welding techniques. It exhibits good weldability and retains its corrosion resistance in the welded area, making it suitable for fabricating complex structures and equipment.

 

Q: What are the limitations of Alloy 825?

A: While Alloy 825 offers excellent corrosion resistance, it may not be suitable for extremely high-temperature applications exceeding 1000°F (538°C). Additionally, it may not be cost-effective for non-corrosive applications due to its higher alloying elements.

 

Q: How does Alloy 825 compare to other nickel alloys?

A: Alloy 825 offers superior corrosion resistance compared to many other nickel alloys, particularly in sulfuric acid and chloride-rich environments. It also exhibits good mechanical properties and fabricability.

 

Q: Can Alloy 825 plates be used in seawater applications?

A: Yes, Alloy 825 is widely used in marine engineering applications due to its excellent resistance to corrosion in seawater and brine, making it suitable for seawater desalination, offshore platforms, and shipbuilding.

 

Alloy 825 plates are highly versatile and offer exceptional corrosion resistance, mechanical properties, and weldability, making them ideal for critical applications in corrosive environments across various industries. Proper material selection and fabrication techniques are essential to maximize the performance and longevity of Alloy 825 components.

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