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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

Material Applications: Corrosion Resistant Alloy Comparison Part: 1

Posted by Dave Olsen on 9/6/16 3:27 PM

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.

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Topics: Alloy Selection, Corrosion Resistance, Physical Properties, 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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