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Explain to a colleague the basis for the ASTM Grain size number?

Explain to a colleague the basis for the ASTM Grain size number?

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Answer #1

ASTM grain size number is equation relating number of grains per in² at 100X. The equation is

n= 2G-1

Where n is the number of grains per in² at 100X and G is the ASTM grain size number.

ASTM grain size number is calculated by

G = 3.321928 logNa - 2.954

Where Na is the number of grains per mm² at 1X and G is rounded off to nearest tenth value.

ASTM grain size number was introduced in 1951 by an undocumented timken member of E-4 Committee when E91- 51T was introduced.

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