ISO 2624:1990 Preview
Copper and copper alloys -- Estimation of average grain size
This standard was last reviewed and confirmed in 2013. Therefore this version remains current.
Specifies three procedures for estimating, and rules for expressing, the average grain size of copper and copper alloys consisting principally of a single phase. The comparison procedure (comparing the specimen with a standard chart) is most convenient and is sufficiently accurate for most commercial purposes. In cases of dispute the use of the Heyn or Jeffries procedures (intercept procedure and planimetric procedure, respectively) having higher degrees of accuracy is recommended.
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