What is the value of the average number of grains per square inch for ASTM 11?
According to ASTM standard E1112, ”standard test methods for determining average grain size is
n = 2 G – 1
n = the number of grains per square inch at 100X magnification, and
G = the ASTM grain size number.
Given ASTM grain size 11, thus,
n = 211 − 1 = 210 = 1024