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2.4660 20 UNS N08020 Nickel Alloy






Material 2.4660 (Nickel alloy 20) is a high-corrosion resistant alloy, which shows very good resistance to phosphoric acid, nitric acid, sulfuric acid in chloric media. 2.4660 (alloy 20) is chiefly used in the chemical industry, apparatus engineering and heat exchanger.

Alloy 20 Carpenter 20, is a nickel-iron-chromium austenitic alloy that was developed for maximum resistance to acid attack, specifically sulfuric acid. This superalloy has excellent resistance to general corrosion, pitting, and crevice corrosion in chemicals containing chlorides and sulfuric, phosphoric, and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion.

Carpenter 20 combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication. Although originally designed for use in sulfuric acid related industries, Alloy 20 is now a popular choice for a wide variety of industries including the chemical, food, pharmaceutical, and plastics industries. In addition, this superalloy is used in heat exchangers, mixing tanks, metal cleaning and pickling equipment, and piping.

There has long been a debate on whether Carpenter 20 is a stainless steel or a nickel alloy because the nickel content is right on the border of defining it as one way or the other. So, depending on who you talk to this alloy may be referred to as alloy 20 Stainless Steel or as a nickel alloy. Either way it is still great for corrosion resistance.

2.4660 have a good resistance properties to pitting and crevice corrosion and good resistance to intercrystalline corrosion, stress corrosion.

What are the characteristics of Alloy 20?

  • Excellent general corrosion resistance to sulfuric acid
  • Excellent resistance to chloride stress corrosion cracking
  • Excellent mechanical properties and fabricability
  • Minimal carbide precipitation during welding
  • Excels in resisting corrosion to hot sulfuric acids
Material No. 2.4660
EN symbol (short) NiCr20CuMo
AISI/SAE
UNS N 08020
AFNOR
B.S.
alloy alloy 20
Registered work's label Nicrofer® 3620Nb
Standards

Chemical composition
C
≤ %
Si
≤ %
Mn
≤ %
P
≤ %
S
≤ %
Cr
%
Mo
%
Ni
%
V
%
0,07 1,0 2,0 0,025 0,015 19,0-21,0 2,0 –3,0 32,0-38,0  
Nb
%
Ti
≤ %
Al
%
Co
≤ %
Cu
≤ %
N
%
Fe
≤ %
Ce
%
Y
≤ %
>=8xC ≤ 1,0 ²     1,5 3,0–4,0   rest    
¹  in accordance with Key to Steel 2001   ² Nb+Ta
Special characteristics
Temperature range Density kg/dm³ Hardness
typically up to 500°C 8,08  

Welding filler
Electrode 2.4609
Main fields of application
chemical industry, phosphoric acid, sulphuric acid, hydrofluoric acid, heat exchanger, apparatus engineering, food industry

Nickel Alloy Seamless Tubes and Pipes
2.4066 | 2.4068 | 2.4360 | 2.4600 | 2.4602 | 2.4605 | 2.4610 | 2.4619 | 2.4633 | 2.4660 | 2.4816 | 2.4851 | 2.4856 | 2.4858 | 2.4889
3.7235 | 3.7035 | 3.7025

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Nickel Alloy Seamless Tubes:

UNS N08020 2.4600 Nickel Alloy 20 Seamless Tubing
UNS N02200 2.4066 200 Nickel Alloy Seamless Tubing
UNS N04400 400 Nickel Alloy 2.4360 Nickel Alloy Tubing
UNS N08800 800 Nickel Alloy Seamless Tubes
UNS N08810 800H UNS N08810 Nickel Alloy Seamless Tubes
UNS N08811 800HT Nickel Alloy Seamless Tubes
UNS N08825 825 2.4858 Nickel Alloy Seamless Tubes
UNS N06600 600 2.4816 Nickel Alloy Seamless Tubes
UNS N06625 625 2.4856 Nickel Alloy Seamless Tubes
UNS N10276 C-276 2.4819 Nickel Alloy Seamless Tubing
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