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Anonymous Poster

Material

09/26/2009 11:43 PM

How to know the ferrite count ?.What is the purpose? Why so need to check in Duplex Material?
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lyn
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Join Date: Oct 2008
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#1

Re: Material

09/27/2009 2:32 AM

Duplex Stainless Steel
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Milo
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#2
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Re: Material

09/27/2009 10:39 AM

My guess is the micro they show isn't even40% ferrite... There's a boatload of austenite in that pic and much of the ferrite is a thin film between grains...

Oh well.

milo

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Corgas
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#3
In reply to #1

Re: Material

09/28/2009 9:10 AM

You may want to check Standard ASTM E-562 " Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count".

Also, document API TR 938-C "Use of Duplex Stainless Steels in the Oil Refining Industry" gives you a modified ferrite tests (ASTM E-562).

Hope this helps
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