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Material Applications: Corrosion Resistant Alloy Comparison Part: 2

Posted by Dave Olsen on 12/12/16 8:58 AM

 

Every material selection decision includes tradeoffs. Performance can come at a price.  But there is little sense in paying for capabilities that are not needed.  The following suggests a framework for selecting one of a family of corrosion-resistant materials from another.

Comparisons

Cost

Cost is rarely ignored, so it is helpful to compare certain corrosion-resistant alloys as multiples of cost of a generally recognized standard material, in this case 304 stainless. This analysis attempts to capture all-in cost including processing, and not just per-pound acquisition cost.

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Topics: Alloy Selection, Corrosion Resistance, Physical Properties, Mechanical Properties

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

Material Applications: Alternative Corrosion Resistant Materials

Posted by Dave Olsen on 9/6/16 4:19 PM

Coatings of various types are often used to enhance corrosion resistance in metals when metallic properties like strength or durability are needed for the application. There are, of course, also non-metallic solutions often used to protect against corrosion.  As with most alternatives, there are advantages and disadvantages associated with each.

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Topics: Alloy Selection, Corrosion Resistance, Alternative Materials

Material Applications: Wear Resistant Alloy Comparison

Posted by Dave Olsen on 9/6/16 4:13 PM

Overview

Every material selection decision includes tradeoffs. Performance can come at a price.  But there is little sense in paying for capabilities that are not needed.  The following suggests a framework for selecting one of a family of wear-resistant materials from another.

Comparisons

Cost

Cost is rarely ignored, so it is helpful to compare certain wear-resistant alloys as multiples of cost of a generally recognized standard material, in this case Hadfield Mn steel. This analysis attempts to capture all-in cost including processing, and not just per-pound acquisition cost.

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Topics: Alloy Selection, Wear Resistance, Physical Properties, Mechanical Properties

Material Applications: Wear Resistance

Posted by Dave Olsen on 9/6/16 3:46 PM

Wear is probably the most common cause of material replacement in industry. Bushings and bearings are common examples of components which must provide metal-to-metal wear resistance.  Wear is a universal constant in moving equipment in all applications.

In some applications like food processing the use of certain materials that provide superior wear resistance (copper-based alloys, for example) is restricted or prohibited. In these applications, specific alloys have been developed to eliminate certain types of wear, like galling, without reacting with the environment. In the case of food processing applications, for example, a series of “dairy metals” has been developed to prevent these types of wear.  When corrosion-resistance is the primary concern, high-performance cobalt-based alloys are often specified.

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Topics: Alloy Selection, Wear Resistance, Physical Properties, Mechanical Properties

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