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2.4660, also known as Alloy 20, UNS N08020, Carpenter 20, 20Cb-3, Incoloy Alloy 20, VAR® 20 or Incoloy 20, is a low carbon nickel-iron-chromium alloy alloyed with the addition of molybdenum, copper and small amounts of niobium, with the following properties and application areas:
W.Nr.: 2.4660
UNS: N08020
The chemical composition of the 2.4660 alloy includes:
A high proportion of nickel (about 33%)
Additions of chromium, molybdenum and copper provide excellent overall corrosion resistance
The limited carbon content combined with stabilization by niobium allows the use of welded components in corrosive environments, usually without post-weld heat treatment
Corrosion resistance: Highly resistant to corrosion, especially good resistance to sulfuric, phosphoric and nitric acid in chloride-containing environments.
Resistance to pitting and stress corrosion cracking: Very good resistance to intergranular corrosion and cracking.
Resistance to chloride stress corrosion cracking: Practical immunity due to its high nickel content.
Application areas of 2.4660 alloy include:
Sulfuric acid pickling tanks: For pickling tanks, racks and heating coils.
Phosphoric acid coating drums: For phosphoric acid coating drums and racks.
Heat exchangers: Used in a variety of chemical processes.
Process piping: Used in chemical and petroleum processing equipment.
Mixing tanks: Used for mixing different chemicals in chemical reactions and processes.
Welding technology: Similar to other ageable nickel-based alloys.
Heat treatment: Due to the addition of niobium, welded components usually do not require post-weld heat treatment.
2.4660 alloy is a high-performance nickel-based superalloy that is valued for its excellent corrosion resistance and the fact that it does not require post-weld heat treatment in welded components. It is suitable for a variety of industrial applications, especially in the chemical and petroleum processing industries. Users should consider the specific application conditions and environment when selecting and using this material to ensure the best performance of the material.
