Super Alloy INCOLOY Alloy 028 (UNS N08028)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
     Cold Working
Applications

Introduction

INCOLOY alloys are composed of nickel-chromium-iron as the primary elements. Additives that are used in this alloy to enhance its strength, corrosion resistance include molybdenum, copper and nitrogen. These alloys are classified as super alloys due to their high strength and ability to function at high temperatures.

INCOLOY alloy belongs to the austenitic stainless steel group and is resistant to a variety of corrosive environments. The combination of chromium and molybdenum make this alloy resistant to both oxidizing and reducing acids and salts. The copper content makes it resistant to sulfuric acid.

This datasheet will look into the chemical composition, properties and applications of INCOLOY 028.

Chemical Composition

The chemical composition of INCOLOY alloy 028 is given in the following table.

Element Content (%)
Iron, Fe 29-40.4
Nickel, Ni 30-34
Chromium, Cr 26-28
Molybdenum, Mo 3-4
Manganese, Mn ≤2.5
Others Remainder

Physical Properties

The following table discusses the physical properties of INCOLOY alloy 028.

Properties Metric Imperial
Density 8 gm/cm3 0.289 lb/in3

Mechanical Properties

The mechanical properties of INCOLOY alloy 028 are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 500 MPa 72.5 ksi
Yield strength(annealed) 214 MPa 31 ksi
Elongation at Break(Cold worked) 15% 50%
Modulus of Elasticity 200 GPa 29000 ksi
Hardness, Rockwell B 80-90 80-90
Hardness, Rockwell C 33 33

Other Designations

Some of the designations used to denote INCOLOY alloy 028 are listed below:

  • UNS N08028
  • ASTM B 668
  • ASTM B709
  • ASTM B829

Fabrication

Cold Working

Cold rolling may be done on the alloy after annealing.

Applications

INCOLOY alloy 028 is used in the following applications:

  • Chemical and petrochemical processing industry
  • Downhole service in deep sour gas wells.

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