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When is aluminum added to steel for deoxidation or for grain size control?

I have a sheet of SA-414-GI would like to know if it has a fine grain structureThe aluminum content is gt;0.02 from the MTR, which would leave me to believe it has a fine grain structureHowever, if the aluminum was added for deoxidation purposes it may have been added at a different point in the process and have no impact on grain structureOr maybe that doesn't even matter?


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First, if you want to know whether the grain structure is fine, you can lookSample it and measure the grain size Second, fine grain size is in the eye of the beholder, what are you comparing it to? Third, Al killed steels are deoxidized by adding Al during the melting and casting processIt works because Al is much more reactive with O than Fe is so Al will steal O away from Fe oxides, forming Al2O3 The Al2O3 particles can be very effective at pinning grain boundaries so, if processed approprately, Al can help produce a small grainsizeFor details, consult your friendly neighborhood metallurgist.

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