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If there are 930 grains per mm2 on a photomicrograph of a metal at 2X, what is the ASTM grain size number of the metal?

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Fluid flow can affect solidification in a number of ways. For example, when a mold is full, filling defines the temperature distributions of the metal and mold. This sets up a residual flow that continues to distribute heat in the casting.

If there are 930 grains per mm<sup>2</sup> on a photomicrograph of a metal at 2X, what is the ASTM grain size number of the metal?






 
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