Super Alloy Elgiloy (UNS 30003)

Jul 30 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications

Introduction

Super alloys are widely used in numerous industries to make components such as gas turbine engines, rocket motors, nuclear reactors, submarines, and petroleum equipment. Super alloys perform exceptionally in high temperature environments.

Super alloy Elgiloy is a cobalt-chromium-nickel alloy, and provides high strength, fatigue life, ductility, and good mechanical properties. It is also corrosion resistant in various environments. It is recommended that forming should be done before heat treatment as heat treatment strengthens the material and makes it more difficult to form.

The following sections will be discussed in detail about super alloy Elgiloy.

Chemical Composition

The chemical composition of super alloy Elgiloy is outlined in the following table.

Element Content (%)
Cobalt, Co 39 - 41
Chromium, Cr 19 - 21
Nickel, Ni 14 – 16
Iron, Fe 11.25 - 20.5
Molybdenum, Mo 6-8
Manganese, Mn 1.5 - 2.5
Carbon, C ≤ 0.15
Beryllium, Be ≤ 0.10

Physical Properties

The physical properties of super alloy Elgiloy are tabulated below.

Properties Metric Imperial
Density 8.30 g/cm3 0.300 lb/in3
Melting point 1427°C 2601°F

Mechanical Properties

The following table shows mechanical properties of super alloy Elgiloy.

Properties Metric Imperial
Tensile strength 970 MPa 141000 psi
Yield strength 480 MPA 69600 psi
Poisson’s ratio 0.226 0.226
Elastic modulus 189.6 GPa 27500 ksi
Hardness, Brinell 224 224
Hardness, Knoop 262 262
Hardness, Rockwell A 60 60
Hardness, Rockwell B 97 97
Hardness, Rockwell C 19 19
Hardness, Vickers 230 230

Thermal Properties

The thermal properties of super alloy Elgiloy are tabulated below.

Properties Metric Imperial

Thermal expansion co-efficient

(at 0.000-500°C/32-932°F)

 15.17 µm/m°C 8.42 µin/in°F
Thermal conductivity 12.5 W/mK 86.8 BTU in/hr.ft².°F

Other Designations

Equivalent materials to super alloy Elgiloy are listed below:

  • AMS 5833
  • AMS 5834
  • AMS 5875
  • AMS 5876

Applications

Super alloy Elgiloy is used to make springs that are corrosion resistant and exhibit high strength, ductility, and good fatigue life.

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