• Source: Alloy 20

      • Alloy 20 is an austenitic stainless steel containing less than 50% iron developed for applications involving sulfuric acid. Its corrosion resistance also finds other uses in the chemical, petrochemical, power generation, and plastics industries. Alloy 20 resists pitting and chloride ion corrosion, better than 304 stainless steel and on par with 316L stainless steel. Its copper content protects it from sulfuric acid. Alloy 20 is often chosen to solve stress corrosion cracking problems, which may occur with 316L stainless. Alloy of the same name with the designation "Cb-3" indicates niobium (also known as columbium) stabilized.


      Composition


      Nickel, 32–38%
      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-3
      AL 20
      Carlson Alloy C20
      Nickelvac 23
      Nicrofer 3620 Nb, also known as VDM Alloy 20


      Specifications


      ASTM B729, B464, B366, B463, B473, B462, A182, A351, ASTM A743
      ASME SB729, SB464, SB366, SB473, SB462,SA 182, SA351
      ANSI / ASTM A555-79
      EN 2.4660
      UNS N08020
      Werkstoff 2.4660
      Castings are designated CN7M


      References

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