This practice covers the procedure for designating (within ASTM specifications) standard grades of flat-rolled electrical and lamination steels made to specified maximum values of core loss. It applies to magnetically soft irons and steel (low-carbon steels and alloys of iron with silicon, aluminum, etc.) where a core-loss measurement at a stated peak value of alternating induction and a stated frequency, such as 15 kG (1.5 T) and 60 Hz, is normally utilized to grade the material. It also applies when some other property is specified (or a different induction or frequency, or both) as the limiting characteristic, provided the material also meets all the requirements of the ASTM specification. Individual specifications that are in conformity with this specification are A677, A677M, A683, A683M, A726, A726M, A840, A840M, A876, A876M.This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ANSI/ASTM A664:1999 history
1999ANSI/ASTM A664:1999 Practice for Identification of Standard Electrical -- and Lamination-Steel Grades in ASTM Specifications