Nickel Alloy 800H (UNS N08811)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Applications

Introduction

Nickel alloy 800H is essentially the same as nickel alloy 800, except that the carbon content is limited to the upper portion of the specified range. This alloy is subjected to solution-anneal and hence it exhibits a coarser grain structure. It has high creep and rupture strengths, which enable the alloy to be used in applications that require prolonged exposure to corrosive environments.

The following datasheet will provide an overview of nickel alloy 800H.

Chemical Composition

The chemical composition nickel alloy 800H is outlined in the following table.

Element Content (%)
Iron, Fe ≤39.5
Nickel, Ni 30-35
Chromium, Cr 19-23
Manganese, Mn ≤1.5
Silicon, Si ≤1
Copper, Cu ≤0.75
Titanium, Ti 0.15-0.6
Aluminum, Al 0.15-0.6
Carbon, C 0.050 - 0.10
Sulfur, S ≤0.015

Physical Properties

The following table shows the physical properties of nickel alloy 800H.

Properties Metric Imperial
Density 7.94 g/cm3 0.287 lb/in3
Melting point 1357-1385°C 2475-2525°F

Mechanical Properties

The mechanical properties of nickel alloy 800H are displayed in the following table.

Properties Metric Imperial
Tensile strength (@649°C/1200°F) 378 MPa 54800 psi
Yield strength (@649°C/1200°F) 93.1 MPa 13500 psi
Elongation at break (@21°C/70°F) ≥30% ≥30%

Applications

The following are the list of applications of nickel alloy 800H:

  • Petroleum and petrochemical industries
  • Power generation
  • Steel production
  • Thermal processing
  • Chemical processing

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