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Grain Size Measurement

Grain size is normally quantified by a numbering system. Coarse 1 5 and fine 5 8. The number is derived fron the formula N 2n 1 where n is the number of grains per square inch at a magnification of 100 diameters. Grain size has an important effect on physical properties. For service at ordinary temperatures it is generally considered that fine grained steels give a better combination of strength and toughness, whereas coarse grained steels have better machinability.