90.93 Standard confirmed Oct 22, 2008
CEN
CEN/TC 133 Copper and copper alloys
European Norm
77.120.30 Copper and copper alloys
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.
PUBLISHED
EN ISO 2624:1995
90.93
Standard confirmed
Oct 22, 2008