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Incoloy 20

Incoloy 20

    About Alloy

    Alloy 20, also known as UNS N08020 or W. Nr 2.4660, is a type of stainless steel that is highly resistant to corrosion and pitting, particularly in acidic environments. It is a chromium-nickel alloy with a minimum of 16% chromium and 24% nickel content, as well as additions of molybdenum, manganese, and copper.
    The molybdenum addition enhances the alloy's resistance to pitting and crevice corrosion, making it a popular choice for applications involving sulfuric, hydrochloric, and phosphoric acids. Additionally, Alloy 20 has good resistance to chloride stress corrosion cracking and is often used in equipment for the production of nitric acid and other chemicals.
    Alloy 20 has a relatively high carbon content, which can lead to the formation of carbides and precipitates, potentially reducing the material's resistance to corrosion. To mitigate this issue, a low-carbon version, Alloy 20Cb-3, is also available. This version has a reduced carbon content and higher levels of columbium (niobium) to improve its resistance to corrosion.
    Alloy 20 is commonly used in the chemical, petroleum, and pulp and paper industries for equipment such as heat exchangers, reactor vessels, and piping. It is also used in the food and pharmaceutical industries for the production of equipment that comes into contact with acidic food products or chemicals.
    In summary, Alloy 20 is a chromium-nickel stainless steel known for its high corrosion resistance, particularly in acidic environments. It is commonly used in the chemical, petroleum, and food processing industries for equipment exposed to corrosive environments.

    Product Form

    Bar: ASTM B 473
    Plate/Sheet/Strip: ASME SB-463, ASME SB-464, ASTM B 463, ASTM B464
    Wire: ASME SB-473 ASME SB-366, ASTM B 473, ASTM B 366
    Pipe: ASTM B464
    UNS N08020, Werkstoff Nr. 2.4660, Covered Electrodes AWS E320LR, Fordings ASTM B462

    Chemical Composition

    Weight % Ni Cr Cu Mo Fe C Nb+Ta Mn P S Si
    Alloy 20 32.0 - 38.0 19 - 21 3 - 4 2 - 3 bal 0.07 max 8 x C-1 2 max 0.045 max 0.035 max 1.0 max

    Property

    Material Yield Strength (0.2% Offset) Tensile Strength Elongation %
    psi MPA psi MPA Elongation (%)
    Alloy 20 45,000 300 90,000 620 40

    Application

    Production of plastics and synthetic fibers
    Chemical and petroleum processing equipment
    Mixing tanks
    Heat exchangers
    Process piping

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