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.
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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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A342/A342M Test Methods for Permeability of Feebly Magnetic Materials
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A531/A531M Practice for Ultrasonic Examination of Turbine-Generator Steel Retaining Rings
A788/A788M Specification for Steel Forgings, General Requirements
E45 Test Methods for Determining the Inclusion Content of Steel
E112 Test Methods for Determining Average Grain Size
E165 Practice for Liquid Penetrant Examination for General Industry
alloy steel; cold worked; generator retaining rings; nonmagnetic; steel forgings; Alloy steel forgings--specifications; Cold-worked steel--specifications; Generator materials; Nonmagnetic retaining rings; Retaining rings;
ICS Number Code 77.140.85 (Iron and steel forgings)
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