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Material Applications: High Temperature Corrosion

Posted by Dave Olsen on 9/6/16 4:23 PM

As the performance demands on metals tend to increase as temperature increases, so do the types of corrosive attacks to which the metal is likely to be subjected. When we think of significant industries and applications that are most likely to face the combined effects of high temperature with a corrosive environment significant ones come to mind:

  • Gas and Steam Turbines
  • Heat Treating
  • Mineral Processing
  • Chemical Processing
  • Pulp and Paper
  • Waste Incineration
  • Fossil Fuel Power Generation

High-temperature corrosion performance is a form of corrosion that does not require the presence of a liquid electrolyte. Some important forms of high-temperature corrosion to consider that often cause equipment problems are:

  • Ash/Salt Deposit Corrosion
  • Carburization
  • Halogen Corrosion
  • Metal Dusting
  • Molten Metal Corrosion
  • Molten Salt Corrosion
  • Nitridation
  • Oxidation
  • Sulfidation
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Topics: Alloy Selection, Corrosion Resistance, Physical Properties, Types Of Corrossion, Mechanical Properties

What Is Pitting Resistance Equivalency Number (PREn)?

Posted by Dave Olsen on 9/6/16 3:14 PM

The Pitting Resistance Equivalency Number (PREn) is an objective way to do an initial comparison of the relative resistance to corrosion of various metals. It is based on a calculation that considers the weight percentage of alloying elements.

PREn = % Cr + (3.3 x % Mo) + (30 x % N)

A simple examination of the components of the PREn calculation indicates those alloys that contribute to corrosion resistance. Chromium, Molybdenum and Nitrogen are all included because their presence in the alloy grade, in combination, contributes to corrosion resistance.  Sometimes Tungsten is also included in the calculation because of its contribution to pitting resistance.

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Topics: Alloy Selection, Corrosion Resistance, Physical Properties, Types Of Corrossion, Mechanical Properties, PREn

Material Applications: Corrosion Types

Posted by Dave Olsen on 9/6/16 3:06 PM

No engineering alloy is immune to corrosion; each has its own corrosion rate depending on the environment in which it is placed. This paper identifies some common types of corrosion, what the results of its presence may be, and how it may be minimized.

Some of the more common types of corrosion are discussed below:

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Topics: Alloy Selection, Corrosion Resistance, Physical Properties, Types Of Corrossion, Mechanical Properties

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