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An ASTM grain size determination is being made from a photomicrograph of a metal at a magnification of 1X. What is the ASTM grain size number of the metal if there are 992 grains per square mm?

Correct Answer: 7
N = 2n-1 where, N = no of grains per square inch at 100X n = ASTM grain size number and N is obtained using the following expressioN = N‘/15.5 where N‘ = no. of grains per square mm at 1X Thus, N = 992/15.5 = 64 or, 64 = 2n-1 log 64 = (n-1)(log 2) n = 7.

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