ASTM B463 UNS N08020 Alloy 20 Plate

ASTM B463 UNS N08020, commonly known as Alloy 20, is a nickel-iron-chromium alloy with excellent corrosion resistance in various acidic environments. Here's an overview of its properties and applications:

 

 

Chemical Composition (Typical):

 

Nickel (Ni): 32.0 - 38.0%

Chromium (Cr): 19.0 - 21.0%

Iron (Fe): Balance

Copper (Cu): 3.0 - 4.0%

Molybdenum (Mo): 2.0 - 3.0%

Manganese (Mn): 2.0% max

Carbon (C): 0.07% max

Silicon (Si): 1.0% max

Phosphorus (P): 0.045% max

Sulfur (S): 0.035% max

Nitrogen (N): 0.035% max

 

Mechanical Requirements (Typical for Plate):

 

Tensile Strength: 80 ksi (551 MPa) min

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

Elongation: 30% min

Hardness: HRB 95 max

 

Applications:

 

Alloy 20 plates (ASTM B463 UNS N08020) find extensive use in industries such as chemical processing, pharmaceuticals, food processing, and marine applications.

Particularly favored in environments containing sulfuric acid due to its exceptional resistance to sulfuric acid corrosion.

Common applications include pressure vessels, heat exchangers, piping systems, pumps, valves, and tanks used in corrosive environments.

Common Types and Sizes:

 

Hot Rolled Plates: Thickness: 3mm - 100mm; Width: 1000mm - 2500mm; Length: 2000mm - 12000mm.

Cold Rolled Plates: Thickness: 0.3mm - 6mm; Width: 1000mm - 2500mm; Length: 2000mm - 12000mm.

Annealed Plates: Similar to hot rolled plates, annealed plates undergo heat treatment for improved properties.

Pickled Plates: These plates have a clean, scale-free surface achieved through pickling process.

 

Q&A:

 

Q: Can Alloy 20 withstand high temperatures?

A: While Alloy 20 offers good mechanical properties and corrosion resistance at moderate temperatures, it may experience reduced strength and corrosion resistance at temperatures exceeding 1000°F (538°C).

 

Q: Is Alloy 20 weldable?

A: Yes, Alloy 20 is readily weldable using conventional welding techniques. However, proper welding procedures and post-weld heat treatment may be necessary to maintain its corrosion resistance.

 

Q: What makes Alloy 20 suitable for sulfuric acid environments?

A: Alloy 20 contains high levels of chromium, nickel, and molybdenum, which provide excellent resistance to sulfuric acid corrosion, even at elevated temperatures and concentrations.

 

Q: Are there any limitations to using Alloy 20?

A: While Alloy 20 offers exceptional corrosion resistance, it may not be suitable for applications involving strong reducing acids or oxidizing environments.

 

Q: How can Alloy 20 plates be protected against corrosion?

A: In addition to its inherent corrosion resistance, Alloy 20 plates can be further protected by applying coatings or linings, such as epoxy or rubber linings, to surfaces exposed to corrosive media.

 

Alloy 20 plates are highly versatile and offer excellent corrosion resistance in a variety of demanding environments. Proper material selection, fabrication, and maintenance are essential to maximize the performance and longevity of Alloy 20 components.

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