• N08020
  • 2.4660

ABOUT ALLOY 20

Alloy 20 is a nickel-iron-chromium austenitic alloy developed with the additions of copper and molybdenum for maximum resistance to acid attack, specifically sulphuric acid. 

Key properties

(in annealed condition)
Tensile strength: 80.00
Yield strength: 35.00
Elongation: 30.00%
Hardness: 217.00

Ni

32.0-38.0%

Cr

19.0-21.0%

Mo

2.0-3.0%

Fe

Balance

Nb+Ta

8 x C -1.0%

Si

1.0% max

Mn

2.0% max

Cu

3.0-4.0%

C

0.07% max

S

0.035% max

P

0.045% max

INVENTORY

Product form Size range from Size range to
Alloy 27-7MO pipe 0.5 in 8 in
Alloy 27-7MO tube 12 mm 260 mm
Alloy 27-7MO pipe fittings 0.5 in 8 in
Alloy 27-7MO flanges 0.5 in 8 in
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APPLICATIONS

oil-agas

Alloy 20 can be used in a variety of applications

  • Pollution control
  • Power, marine
  • Chemical processing
  • Pulp and paper
  • Oil and Gas industries

ABOUT ALLOY 20

It has excellent resistance to generation corrosion, pitting and crevice corrosion in chemicals containing chlorides, sulphuric, phosphoric and nitric acids. This means it offers strong resistance to chloride stress corrosion cracking.

It also contains niobium for stabilization against sensitization and resultant intergranular corrosion. It excels in resisting corrosion to hot sulphuric acids.

Alloy 20 combines excellent corrosion resistance with elevated mechanical properties and relatively easy fabrication. Its stabilization also minimizes carbide precipitation during welding.

While it was originally designed for use in sulphuric acid related industries, Alloy 20 is now a popular choice in a variety of industries including the chemical, food, dye, pharmaceutical and plastics industries. In addition, this superalloy is used in heat exchangers, mixing tanks, metal cleaning and pickling equipment and piping.

The nickel content of Alloy 20 is on the border between a nickel alloy and stainless steel. It may also be referred to as alloy 20 stainless steel.

To learn more about our stock of Alloy 20 pipe and tube contact us, or fill in our online quote request form and one of our team will get back to you.

Properties of Alloy 20

DENSITY    8.02 g/cm³ | 0.289 lb/in³ 
MELTING POINT

1321-1399°C | 2410-2550°F

ALLOY 20 MECHANICAL PHYSICAL PROPERTIES

Property  
Ultimate Tensile Strength (annealed) 120 ksi
0.2% Yield Strength (annealed) 60 ksi
Elongation %( in 2 in 50 mm) 50%
Coefficient of Thermal Expansion µm/m⁰C 15.0
Thermal Conductivity /kcal/(W/m•°C) 10.1

Alloy 20 Specifications

UNS Number N08020
WNR Number N/A
Standards -

Welding Consumables

WELDING ELECTRODES Inconel 112, Inconel 122
FILLERS Inconel filler metal 625, Inconel filler metal 622
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