ASTM A469/A469M-07

Standard Specification for Vacuum-Treated Steel Forgings for Generator Rotors

ABSTRACT
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.
SCOPE
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 A 788/A 788M, 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.

General Information

• Status: Historical
• Publication Date: 28-Feb-2007
• ICS: 77.140.85 - Iron and steel forgings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaces: ASTM A469/A469M-06 - Standard Specification for Vacuum-Treated Steel Forgings for Generator Rotors
• Effective Date: 01-Mar-2007
• Replaced By: ASTM A469/A469M-07(2012) - Standard Specification for Vacuum-Treated Steel Forgings for Generator Rotors
• Effective Date: 01-May-2012
• Referred By: ASTM A788/A788M-23 - Standard Specification for Steel Forgings, General Requirements
• Effective Date: 01-Mar-2007
• Referred By: ASTM A418/A418M-15(2020) - Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
• Effective Date: 01-Mar-2007
• Referred By: ASTM A388/A388M-19 - Standard Practice for Ultrasonic Examination of Steel Forgings
• Effective Date: 01-Mar-2007

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A469/A469M – 07
Standard Specification for
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Vacuum-Treated Steel Forgings for Generator Rotors
This standard is issued under the fixed designationA469/A469M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. Ordering Information and General Requirements
1.1 This specification covers vacuum-treated basic electric 3.1 In addition to the ordering information required by
steel forgings for generator rotors. Specification A788/A788M, the purchaser shall include with
1.2 Supplementary requirements are provided, both in this the inquiry and order, a dimensioned drawing showing the
standard and in Specification A788/A788M, for use when mechanical test specimen locations, together with:
additional testing, inspection or processing is required by the 3.1.1 Details of any required magnetic permeability tests
purchaser. (6.1).
1.3 The values stated in either inch-pound or SI (metric) 3.1.2 If the yield strength is to be determined at an offset of
units are to be regarded separately as standards.Within the text 0.2%(Table 1), and number of tests (7.1.2 and 7.1.3).
andtables,theSIunitsareshowninbrackets.Thevaluesstated 3.1.3 If vertical heat treatment is required (S3).
in each system are not exact equivalents; therefore, each 3.1.4 If heat treatment by normalizing and tempering is
system must be used independent of the other. Combining required (4.2.2 and 4.2.3).
values from the two systems may result in nonconformance 3.1.5 If post rough machining stress relief may be omitted
with the specification. for forgings that have been double tempered (4.2.2).
1.4 Unless the order specifies the applicable “M” specifica- 3.1.6 Details for boring including dimensions, finish, timing
tion designation, the material shall be furnished to the inch- and additional testing if required (8.3 and S1).
pound units. 3.1.7 Any applicable instructions regarding the required
nondestructive examinations (8).
2. Referenced Documents
3.1.8 If vacuum arc remelted ingots are to be used, the
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2.1 ASTM Standards: purchaser may require that footnote A to Table 2 be applicable.
A275/A275M Practice for Magnetic Particle Examination
3.2 Material supplied to this specification shall conform to
of Steel Forgings
the requirements of Specification A788/A788M, which out-
A341/A341M Test Method for Direct Current Magnetic lines additional ordering information, manufacturing require-
Properties of Materials Using D-C Permeameters and the
ments, testing and retesting methods and procedures, marking,
Ballistic Test Methods certification, production analysis variations, and additional
A370 Test Methods and Definitions for Mechanical Testing
supplementary requirements.
of Steel Products 3.3 Failure to comply with the applicable general require-
A418/A418M Practice for Ultrasonic Examination of Tur-
ments of Specification A788/A788M constitutes nonconfor-
bine and Generator Steel Rotor Forgings mance with this specification.
A773/A773M Test Method for dc Magnetic Properties of
3.4 If the requirements of this specification are in conflict
Materials Using Ring and Permeameter Procedures with with the requirements of Specification A788/A788M, the
dc Electronic Hysteresigraphs
requirements of this specification shall prevail.
A788/A788M Specification for Steel Forgings, General Re-
4. Materials and Manufacture
quirements
4.1 The vacuum degassing requirements of Specification
A788/A788M are mandatory.
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
4.1.1 Other vacuum methods of degassing may be used if
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
the supplier can demonstrate their adequacy to the satisfaction
A01.06 on Steel Forgings and Billets.
Current edition approved March 1, 2007. Published March 2007. Originally
of the purchaser, but in this case, hydrogen testing per
approved in 1962. Last previous edition approved in 2006 as A469/A469M – 06.
Supplementary Requirement S4 is mandatory.
DOI: 10.1520/A0469_A0469M-07.
2 4.2 Heat Treatment:
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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A469/A469M – 07
TABLE 1 Tensile and Notch Toughness Requirements
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