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Alloy 20

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Alloy 20 is a nickel–chromium–molybdenum alloy developed for applications involving sulfuric acid. Its corrosion resistance also finds other uses in the chemical, food, pharmaceutical, power generation, and plastics industries. Alloy 20 resists pitting and chloride ion corrosion and its copper content protects it from sulfuric acid. Alloy 20 is not a stainless steel but a nickel alloy (ASTM). Alloy 20 is often chosen to solve stress corrosion cracking problems, which may occur with 316L stainless.

Contents

It is also known as Carpenter 20. Cast versions are designated CN7M.

Composition

  • Nickel, 32.5–35%
  • Chromium, 19–21%
  • Carbon, 0.06% maximum
  • Copper, 3–4%
  • Molybdenum, 2–3%
  • Manganese, 2% maximum
  • Silicon, 1.0% maximum
  • Niobium, (8.0 X C), 1% maximum
  • Iron, 31–44% (balance)

    • Other names

  • UNS N08020
  • DIN 2.4660.
  • CN7M
  • Carpenter 20 CB 3TM
  • AL 20TM
  • Carlson Alloy C20TM
  • Nickelvac 23TM
  • Nicrofer 3620 NbTM

    • Specifications

    ASTM B729, B464, B366, B463, B473, B462

    ASME SB729, SB464, SB366, SB473, SB462

    ANSI / ASTM A555-79

    EN 2.4660

    UNS N08020

    Werkstoff 2.4660

    References

    Alloy 20 Wikipedia
    (Text) CC BY-SA