Super Alloy INCOLOY Alloy 020 (UNS N08020)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
     Welding
     Hot Working
     Annealing
Applications

Introduction

INCOLOY is an alloy composed of nickel-iron-chromium, with additions of molybdenum and copper. These alloys are categorized as super alloys and exhibit excellent corrosion resistance and high strength. Some of the INCOLOY alloys are specifically made to resist selected reagents. These alloys are capable of functioning even at high temperatures.

INCOLOY alloy 020 exhibits excellent corrosion resistance in chemical environments that contain sulphuric acid, chlorides, phosphoric acid and nitric acid. It is easy to fabricate this alloy to form mixing tanks, heat exchangers, pickling equipment etc. The standard forms in which this alloy is available are round, flats, pipe, tube, strip and wire.

This datasheet will look into the chemical composition, properties and applications of INCOLOY 020.

Chemical Composition

The chemical composition of INCOLOY alloy 020 is given in the following table.

Element Content (%)
Nickel, Ni 32-38
Iron, Fe 35
Chromium, Cr 19-21
Copper, Cu 3-4
Molybdenum, Mo 2-3
Manganese, Mn ≤2
Niobium, Nb ≤1
Silicon, Si ≤1
Others Remainder

Physical Properties

The following table discusses the physical properties of INCOLOY alloy 020.

Properties Metric Imperial
Density 8.05 gm/cm3 0.291 lb/in3

Mechanical Properties

The mechanical properties of INCOLOY alloy 020 are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 620 MPa 89.9 ksi
Yield strength(annealed) 300 MPa 43.5 ksi
Elongation at Break 41% 41%

Other Designations

Some of the designations used to denote INCOLOY alloy 020 are listed below:

  • UNS N08020
  • ASME SB-462 – SB 464
  • ASME SB 468
  • ASTM B 462
  • ASTM B 464
  • ASTM B 472
  • ASTM B 474
  • ASTM B 751.

Fabrication

Welding

INCOLOY alloy 020 can be welded by shielded metal arc welding, gas tungsten arc welding and gas metal arc welding. The filler metal is usually an INCONEL alloy.

Hot Working

INCOLOY alloy 020 can be hot worked at temperature ranges of 760-1175°C (1400-2150°F).

Annealing

INCOLOY alloy 020 should be annealed at 982-1010°C (1800-1850°F) for time commensurate with section size /AC.

Applications

The INCOLOY alloy 020 is used in the following applications:

  • Produce mixing tanks, heat exchangers, valves, fittings and fasteners
  • Production of gasoline, solvents, explosives and organic chemicals
  • Pharmaceuticals and food industry.

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