This specification covers nonmagnetic alloy steel retaining ring forgings for generators. The steel shall be made by the electro-slag-remelt (ESR) process. The electrodes shall be made by either the basic electric furnace or ladle refining processes. Sufficient discard shall be taken from each ingot to secure freedom from piping and undue segregation. Forged rings shall be solution treated following hot working and prior to the cold expansion procedure. Rings shall be rough machined prior to cold expansion or final heat treatment. Electrical properties and mechanical properties like yield strength, tensile strength, and elongation shall be determined. The rings shall be subject to the following test: tension test, Charpy V-notch impact test, metallographic test and non-destructive test. The ring shall be from cracks, seams, laps, shrinkage, and other injurious defects.

1.1 This specification covers nonmagnetic alloy steel retaining ring forgings for generators.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.3 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.