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Nickel & Nickel Alloy 20 Elbow

What is a nickel based alloy?

Nickel-based alloys are alloys that have a combination of high strength and certain resistance to oxidation and corrosion at high temperatures of 650 to 1000 °C. According to the main performance, it is subdivided into nickel-based heat-resistant alloy, nickel-based corrosion-resistant alloy, nickel-based wear-resistant alloy, nickel-based precision alloy and nickel-based shape memory alloy. Superalloys are classified into iron-based superalloys, nickel-based superalloys and cobalt-based superalloys according to the matrix. Among them, nickel-based superalloys are referred to as nickel-based alloys.

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 fittings

ASTM B366 UNS N08020, Incoloy 020 elbows and tees.

1. Chemical Composition Requirements

The Chemical Composition of Alloy 20, %
Nickel 32.0-38.0
Chromiun 19.0-21.0
Copper 3.0-4.0
Molybdenum 2.0-3.0
Iron Balance
Carbon ≤0.07
Niobium+tantalum 8*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
Mpa ksi Mpa ksi % 103ksi Gpa
620 90 300 45 40 28 193

3. Physical Properties of Alloy 20

Density Specific Heat Electrical Resistivity Thermal Conductivity
g/cm3 J/kg.°C µΩ·m W/m.°C
8.08 500 1.08 12.3

4. Product Forms and Standards

Product Form Standard
Rod, bar and wire ASTM B473, B472, B462
Plate, sheet and strip ASTM A240, A480, B463, B906
Seamless pipe and tube ASTM B729, B829
Welded pipe ASTM B464, B775
Welded tube ASTM B468, B751
Welded fittings ASTM B366
Forged flanges and forged fittings ASTM B462, B472

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