This classification for grain size comprises three sets of comparison charts to be used for determining grain size. These charts are presented in three categories as follows:
Plate I - Untwinned grains (flat etch)
Plate II - Twinned grains (flat etch)
Plate IV - Austenite grains in steel (McQuaid-Ehn test or other test)
Table 1 lists a number of materials and the comparison charts that are suggested for use in estimating their grain size by the comparison method.
NOTEThe suggestions in Table 1 are based upon the customary practices in industry. For specimens prepared according to special techniques, the appropriate comparison chart should be selected on a structural appearance basis as described in the Scope.
SDO | SAE: SAE International |
Document Number | J418 |
Publication Date | May 1, 1999 |
Language | en - English |
Page Count | 7 |
Revision Level | 199905 |
Supercedes | |
Committee |