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Definition of "Grain Size Measurement" |
Grain size is normally quantified by a numbering system. Coarse 1-5 and fine 5-8. The number is derived from 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 bettercombination of strength and toughness, whereas coarse grained steels have better machinability. |
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