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Alloy 20

Designated as UNS N08020, Alloy 20 (also known as “Incoloy 020” or “Incoloy 20”) is a nickel-iron-chromium alloy with additions of copper and molybdenum. It has exceptional corrosion resistance to sulfuric acid, choloride stress-corrosion cracking, nitric acid, and phosphoric acid. Alloy 20 can be readily hot-formed or cold-formed to valves, pipe fittings, flanges, fasteners, pumps, tanks, as well as heat exchanger components. The hot forming temperature should be in the range of 1400-2150°F [760-1175°C]. Usually, the heat treatment of annealing should be conducted at the temperature range of  1800-1850°F [982-1010°C]. Alloy 20 is widely used for the production of gasoline, organic & inorganic chemicals, pharmaceutical processing, and food industry.

ASTM B366 UNS N08020, Incoloy 020 elbows and tees.

ASTM B366 UNS N08020, Incoloy 020 elbows and tees.

1. Chemical Composition Requirements

The Chemical Composition of Alloy 20, %
Nickel32.0-38.0
Chromiun19.0-21.0
Copper3.0-4.0
Molybdenum2.0-3.0
IronBalance
Carbon≤0.07
Niobium+tantalum8*C-1.0
Managanese≤2.00
Phosphorus≤0.045
Sulfur≤0.035
Silicon≤1.00

2. Mechanical Properties of Alloy 20

ASTM B462 Alloy 20 (UNS N08020) forged fittings and forged flanges.

ASTM B462 Alloy 20 (UNS N08020) forged fittings and forged flanges.

Tensile Strength, min.Yield Strength, min.Elongation, min.Young's Modulus
MpaksiMpaksi%103ksiGpa
62090300454028193

3. Physical Properties of Alloy 20

DensitySpecific HeatElectrical ResistivityThermal Conductivity
g/cm3J/kg.°CµΩ·mW/m.°C
8.085001.0812.3

4. Product Forms and Standards

Product FormStandard
Rod, bar and wireASTM B473, B472, B462
Plate, sheet and stripASTM A240, A480, B463, B906
Seamless pipe and tubeASTM B729, B829
Welded pipeASTM B464, B775
Welded tubeASTM B468, B751
Welded fittingsASTM B366
Forged flanges and forged fittingsASTM B462, B472

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    Hebei Metals Industrial Limited
    (Shijiazhuang Metalsin Pipeline Tech Co., Ltd)
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