This specification covers vacuum-treated basic electric steel forgings for use in generator rotors. Steel materials shall be manufactured by vacuum degassing, heat treatment, rough machining, and boring. Heat and product analyses shall be carried out to examine conformation of the specimens with chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, vanadium, and antimony. Forgings shall also go through tension, impact, and Charpy V-notch tests, and shall conform with the following tensile and notch toughness requirements: tensile strength, yield strength, elongation, reduction of area, FATT50, and Charpy absorbed energy. Nondestructive test methods such as ultrasonic and internal inspection shall be performed.
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1.1 This specification covers vacuum-treated basic electric steel forgings for generator rotors.
1.2 Supplementary requirements are provided, both in this standard and in Specification A788/A788M, for use when additional testing, inspection or processing is required by the purchaser.
1.3 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standards. Within the text and tables, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other. Combining values from the two systems may result in nonconformance with the specification.
1.4 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.
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A341/A341M Test Method for Direct Current Magnetic Properties of Materials Using D-C Permeameters and the Ballistic Test Methods
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A418/A418M Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
A773/A773M Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc Electronic Hysteresigraphs
A788/A788M Specification for Steel Forgings, General Requirements
generator rotor forgings; steel forgings; vacuum-treated steel ; vertical heat treatment; yield strength at 0.02 % offset; Forgings (turbine rotors/disks/shafts); Generator materials--turbine rotors and shafts; Steel forgings (turbine)--specifications; Vacuum treated steel forgings--specifications
ICS Number Code 77.140.85 (Iron and steel forgings)
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