Alloy 20 (UNS N08020), also known as Carpenter 20, is a nickel-iron-chromium stainless steel alloy. This steel is austenitic, meaning it cannot be hardened by heat treatment. It has corrosion resistance and good mechanical properties at low and high temperatures. Let’s look at the composition, mechanical properties and uses of Alloy 20 in more detail.
What is Alloy 20?
UNS N08020 is a nickel-iron-chromium alloy that is highly resistant to corrosion and other harmful elements. It can easily withstand extreme temperature fluctuations and is therefore commonly used in machinery and equipment such as tanks and pumps. The alloy has excellent strength and toughness properties, making it a popular choice for those seeking a strong and economical material. In addition, the alloy’s good ductility means that it can be formed or manipulated into any desired shape. All of these noteworthy properties make alloy 20 an extremely practical choice for the manufacture of products that will come into contact with corrosive substances or high temperatures.
Alloy 20 Chemical Composition.
Alloy 20 contains a balanced composition of nickel (30%), chromium (19-22%), molybdenum (2-3%), manganese (1.5%), iron (balanced), silicon (0.75%), sulphur (0.035%) and carbon (0.07%). The balanced combination of these elements results in a steel alloy with good strength and excellent corrosion resistance to acidic and alkaline environments. It has a higher resistance to stress corrosion cracking than most other alloys.
Element Content (%)
Iron, Fe 35
Nickel, Ni 32-38
Chromium, Cr 19-21
Copper, Cu 3-4
Manganese, Mn ≤2
Molybdenum, Mo 2-3
Niobium, Nb ≤1
Silicon, Si ≤1
Carbon, C ≤0.07
Phosphorus, P ≤0.045
Sulfur, S ≤ 0.035
Alloy 20 Properties.
Alloy 20 is an amazing metal alloy with fascinating properties and a wide range of applications. It is a nickel-iron-chromium stainless steel that is most commonly used in the chemical, food and pharmaceutical industries. Noteworthy features of Alloy 20 are its acid resistance and excellent formability, making it ideal for a variety of high-temperature applications, including heat exchangers, pressure vessels, condensers, and valves. It also contains molybdenum for enhanced corrosion resistance at elevated temperatures. Its high work-hardening capacity makes it ideally suited for the manufacture of components requiring higher yields and greater tensile strength. In addition to its unique combination of mechanical properties, Alloy 20 is highly resistant to stress corrosion cracking and sulfides such as sulfuric acid. For these reasons and more, you can trust Alloy 20 to have all the excellent properties you need for any industrial application.
Mechanical Properties.
The mechanical properties of Alloy 20 include tensile strengths ranging from a minimum of 80ksi to a maximum of 145ksi and 0.2% yield strengths ranging from a minimum of 40ksi to a maximum of 95ksi. Elongation in hot rolled product form or annealed conditions is 30% to 40% maximum in 2″; for cold finished forms in all conditions, elongation may be 50% minimum to 60% maximum in 2″. For cold finished forms under all conditions, elongation may range from a minimum of 50% to a maximum of 60% in 2 inches.
Properties: Metric Units Imperial Units
Tensile Strength (Annealed) 620 MPa 89,900 psi
Yield Strength (annealed) 300 MPa 43500 psi
Elongation at break (annealed) 41% 41
Alloy 20 Equivalent:
ASME SB-462 – SB-462
asme sb-462 – sb-464
ASME SB-468
astm b 462 – b 464
ASTM B 468
ASTM B 472 – B 474
ASTM B 751
Alloy 20 Uses:
Because of its good mechanical strength and excellent corrosion resistance over a wide temperature range, UNS N08020 is used in many industries, including pharmaceuticals, chemical processing, power generation, pulp and paper production, food processing, oil and gas exploration and production, wastewater treatment systems and nuclear fuel reprocessing plants. It can be used in many applications such as pumps, valves and fittings; pickling equipment; fasteners; flanges; heat exchangers; pressure vessels; storage tanks; pipework and components; nuclear fuel element spacers; condensers and evaporators; pipework components and racks; centrifuges and agitators; hydrotreating reaction vessels/towers/pipework; and trays and baskets for the handling of corrosive materials.
Production of plastics and synthetic fibres
Chemical and petroleum processing equipment
Mixing tanks
Heat exchangers
Process piping
Conclusion:
Alloy 20 is an austenitic stainless steel that provides excellent corrosion resistance in acidic and alkaline environments while maintaining good mechanical properties over a wide temperature range. It contains nickel (30%), chromium (19-22%), molybdenum (2-3%), manganese (1.5%), iron (balanced), silicon (0.75%), sulphur (0.035%), and carbon (0.07%), making it ideally suited for use in pharmaceutical processing, chemical processing, power generation, pulp and paper production, and many other industries, where it is used in pumps, valves and fittings, pickling equipment, fasteners, flanges , heat exchangers, pressure vessels, storage tanks, piping systems and components, etc. If you are looking for an alloy that provides excellent corrosion resistance in a variety of harsh industrial environments while maintaining strong mechanical properties, then Alloy 20 should be your first choice!
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Post time: Jul-22-2023
