Incoloy® Alloy 20

Incoloy® Alloy 020 - UNS N08020 - W. Nr. 2.4660 - Alloy 20 - NiCr Alloy

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Table of Contents
Datasheet Chemistry
Inventory Applications
General Data Mechanical Properties
Specifications Machining, Welding, & Processing

Alloy 20 has excellent corrosion resistance in a variety of chemical environments, especially containing sulfuric acid. This alloy also has good resistance to phosphoric acid, chlorides, and nitric acid environments.


View or download Special Metals' Incoloy® 020 datasheet here


Min. Max.
Ni 32 38
Cr 19 21
Cu 3.0 4.0
Mo 2.0 3.0
Fe Bal.
C 0.07
Nb+Ta 8 x C 1.0
Mn 2.0
P 0.045
S 0.035
Si 1.0
*Composition information provided by Special Metals' datasheet on Incoloy® Alloy 020, available here.

Typical Inventory

Round Bar, Loose Coil, Sheet, Plate, Pipe, Fastener, Tubing, Fittings


  • Oil & Gas
  • Solvents
  • Organic & Inorganic Chemicals
  • Pharmaceuticals
  • Food Processing
  • Heat Exchangers
  • Mixing Tanks
  • Pickling Equipment

General Data

Alloy 20 is readily fabricable making it great for producing chemical processing systems. The general corrosion resistance to chemicals makes this alloy an excellent choice for many pipe and fitting requirements.

  • Excellent resistance to sulfuric acid
  • Useful against phosphoric acid, chlorides, and nitric acid
  • Easier fabrication

Mechanical Properties

The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs.

Typical Room Temperature Mechanical Properties
Ultimate Tensile Ksi (MPa) Yield Strength Ksi (MPa) Elongation %
90 (620) 45 (300) 40

Common Specifications

Note that the specifications listed are common for this alloy but are for reference only and may be specific to a certain form. The specifications listed are not comprehensive nor indicative of any edition, revision, or similar such as an amendment. Please, reach out to our sales department to request the Material Test Report (MTR) or to confirm your required specifications.

Form Standard
Identification UNS N08020, W. Nr. 2.4660
Bar ASTM B473, ASME SB473
Sheet, Plate, or Strip ASTM B463, ASTM B751, ASME SB463, ASME SB751
Pipe - Seamless ASTM B729, ASME SB729
Pipe - Welded ASTM B464, ASTM B474, ASME SB464, ASME SB474
Tube - Seamless ASTM B729, ASME SB729
Tube - Welded ASTM B468, ASME SB468
Fitting ASTM B462, ASME SB462
Weld Electrode UNS N08022/ AWS A5.9 ER320LR


Nickel and cobalt based alloys can be difficult to machinine. However, it should be emphasized that these alloys can be machined using conventional production methods at satisfactory rates. These alloys harden rapidly, generate high heat during cutting, weld to the cutting tool surface and offer high resistance to metal removal because of their high shear strengths. The following are key points which should be considered during machining operations:

  • CAPACITY - Machine should be rigid and overpowered as much as possible.
  • RIGIDITY - Work piece and tool should be held rigid. Minimize tool overhang.
  • TOOL SHARPNESS - Make sure tools are sharp at all times. Change to sharpened tools at regular intervals rather than out of necessity. A 0.015 inch wear land is considered a dull tool.
  • TOOLS - Use positive rake angle tools for most machining operations. Negative rake angle tools can be considered for intermittent cuts and heavy stock removal. Carbide-tipped tools are suggested for most applications. High speed tools can be used, with lower production rates, and are often recommended for intermittent cuts.
  • POSITIVE CUTS - Use heavy, constant, feeds to maintain positive cutting action. If feed slows and the tool dwells in the cut, work hardening occurs, tool life deteriorates and close tolerances are impossible.
  • LUBRICATION - lubricants are desirable. Soluble oils are recommended especially when using carbide tooling.

Special Metals' datasheet on Incoloy® 020

Incoloy® is a registered trademark of Special Metals Corp.

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