ASTM ASME SB 473 Alloy 20 UNS N08020 Bar

ASTM/ASME SB 473 Alloy 20 (UNS N08020) is a nickel-iron-chromium alloy with additions of copper and molybdenum. It is commonly known as Alloy 20 and is renowned for its exceptional corrosion resistance in various environments. Here's a detailed overview of its specifications, properties, and applications:

Grade Names:

DIN: 2.4660

JIS: NW 08020

EN: NiCr20CuMo

ASME: SB 473

Elemental Composition:

Nickel (Ni): 32-38%

Chromium (Cr): 19-21%

Iron (Fe): Balance

Copper (Cu): 3-4%

Molybdenum (Mo): 2-3%

Niobium (Nb): 8xC min, 1.0 max

Carbon (C): 0.07% max

Manganese (Mn): 2.0% max

Silicon (Si): 1.0% max

Sulfur (S): 0.035% max

Phosphorus (P): 0.045% max

Mechanical Properties (Typical Values):

Tensile Strength: 80 ksi (551 MPa) minimum

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

Elongation: 30% minimum

Hardness (Brinell): 217 max

Application Range:

Alloy 20 finds extensive applications in industries such as chemical processing, pharmaceuticals, food processing, and more, where corrosion resistance against sulfuric acid, pitting, crevice corrosion, and intergranular corrosion is required. Common applications include:

Chemical processing equipment (reactors, heat exchangers, storage tanks)

Pharmaceutical and food processing equipment

Piping systems and valves

Pollution control equipment

Heat exchangers and condensers

Petrochemical industry components

Common Q&A:

Is Alloy 20 suitable for use in sulfuric acid environments?

Yes, Alloy 20 offers excellent resistance to sulfuric acid, making it suitable for use in environments where this corrosive acid is present.

Can Alloy 20 be welded?

Yes, Alloy 20 can be welded using conventional welding techniques. It is important to use filler metals compatible with Alloy 20 to maintain its corrosion resistance properties.

What are the limitations of Alloy 20?

While Alloy 20 offers excellent corrosion resistance, it may not be suitable for use in highly reducing environments or environments containing strong oxidizing agents such as nitric acid.

Is Alloy 20 more expensive compared to stainless steel?

Yes, Alloy 20 is typically more expensive than standard stainless steels due to its nickel and molybdenum content. However, its superior corrosion resistance justifies the higher cost in many applications.

Can Alloy 20 be used in high-temperature applications?

Alloy 20 exhibits good mechanical properties at elevated temperatures and can be used in high-temperature applications. However, its performance may not be as superior as some other high-temperature alloys like Inconel or Hastelloy in extreme conditions.

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