ASTM A469/A469M-07(2017)

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 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.

General Information

• Status: Historical
• Publication Date: 14-Mar-2017
• 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

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 (Reapproved 2017)
Standard Specification for
1
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
the inquiry and order, a dimensioned drawing showing the
1.2 Supplementary requirements are provided, both in this
mechanical test specimen locations, together with:
standard and in Specification A788/A788M, for use when
3.1.1 Details of any required magnetic permeability tests
additional testing, inspection or processing is required by the
(6.1).
purchaser.
3.1.2 If the yield strength is to be determined at an offset of
1.3 The values stated in either inch-pound or SI (metric)
0.2%(Table 1), and number of tests (7.1.2 and 7.1.3).
units are to be regarded separately as standards.Within the text
3.1.3 If vertical heat treatment is required (Supplementary
andtables,theSIunitsareshowninbrackets.Thevaluesstated
Requirement 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 Supplementary
pound units.
Requirement S1).
3.1.7 Any applicable instructions regarding the required
2. Referenced Documents
nondestructive examinations (8).
2
2.1 ASTM Standards:
3.1.8 If vacuum arc remelted ingots are to be used, the
A275/A275M Practice for Magnetic Particle Examination of
purchaser may require that footnoteA to Table 2 be applicable.
Steel Forgings
3.2 Material supplied to this specification shall conform to
A341/A341M Test Method for Direct Current Magnetic
the requirements of Specification A788/A788M, which out-
Properties of Soft Magnetic Materials Using D-C Per-
lines additional ordering information, manufacturing
meameters and the Point by Point (Ballistic)Test Methods
requirements, testing and retesting methods and procedures,
A370 Test Methods and Definitions for Mechanical Testing
marking, certification, production analysis variations, and ad-
of Steel Products
ditional supplementary requirements.
A418/A418M Practice for Ultrasonic Examination of Tur-
bine and Generator Steel Rotor Forgings
3.3 Failure to comply with the applicable general require-
A773/A773M Test Method for Direct Current Magnetic
ments of Specification A788/A788M constitutes nonconfor-
Properties of Low Coercivity Magnetic Materials Using
mance with this specification.
Hysteresigraphs
3.4 If the requirements of this specification are in conflict
A788/A788M Specification for Steel Forgings, General Re-
with the requirements of Specification A788/A788M, the
quirements
requirements of this specification shall prevail.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
4. Materials and Manufacture
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
4.1 The vacuum degassing requirements of Specification
Current edition approved March 15, 2017. Published March 2017. Originally
A788/A788M are mandatory.
approved in 1962. Last previous edition approved in 2012 as A469/
A469M – 07(2012). DOI: 10.1520/A0469_A0469M-07R17.
4.1.1 Other vacuum methods of degassing may be used if
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
the supplier can demonstrate their adequacy to the satisfaction
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
of the purchaser, but in this case, hydrogen testing per
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Supplementary Requirement S4 is mandatory.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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A469/A469M−07 (2017)
TABLE 1 Tensile and Notch Toughness Requir
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A469/A469M − 07 (Reapproved 2012) A469/A469M − 07 (Reapproved 2017)
Standard Specification for
1
Vacuum-Treated Steel Forgings for Generator Rotors
This standard is issued under the fixed designation A469/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
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
2
2.1 ASTM Standards:
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A341/A341M Test Method for Direct Current Magnetic Properties of Soft Magnetic Materials Using D-C Permeameters and the
Point by Point (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 Direct Current Magnetic Properties of Low Coercivity Magnetic Materials Using Hysteresig-
raphs
A788/A788M Specification for Steel Forgings, General Requirements
3. Ordering Information and General Requirements
3.1 In addition to the ordering information required by Specification A788/A788M, the purchaser shall include with the inquiry
and order, a dimensioned drawing showing the mechanical test specimen locations, together with:
3.1.1 Details of any required magnetic permeability tests (6.1).
3.1.2 If the yield strength is to be determined at an offset of 0.2 % (Table 1), and number of tests (7.1.2 and 7.1.3).
3.1.3 If vertical heat treatment is required (S3).(Supplementary Requirement S3).
3.1.4 If heat treatment by normalizing and tempering is required (4.2.2 and 4.2.3).
3.1.5 If post rough machining stress relief may be omitted for forgings that have been double tempered (4.2.2).
3.1.6 Details for boring including dimensions, finish, timing and additional testing if required (8.3 and Supplementary
Requirement S1).
3.1.7 Any applicable instructions regarding the required nondestructive examinations (8).
3.1.8 If vacuum arc remelted ingots are to be used, the purchaser may require that footnote A to Table 2 be applicable.
3.2 Material supplied to this specification shall conform to the requirements of Specification A788/A788M, which outlines
additional ordering information, manufacturing requirements, testing and retesting methods and procedures, marking, certification,
production analysis variations, and additional supplementary requirements.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.06
on Steel Forgings and Billets.
Current edition approved May 1, 2012March 15, 2017. Published May 2012March 2017. Originally approved in 1962. Last previous edition approved in 20072012 as
A469/A469M – 07.A469/A469M – 07(2012). DOI: 10.1520/A0469_A0469M-07R12. 10.1520/A0469_A0469M-07R17.
2
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’sstandard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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A469/A469M − 07 (2017)
TABLE 1 Tensile and Notch Toughness Requirements
Grade
2 3 4 5 6 7 8
Tensile strength, min, ksi 80 90 100 110 100 110 120
[MPa] [550] [620] [690] [760] [690] [760] [825]
A
Yield strength, min, ksi 55 70 80 90 80 90 100
[MPa] [380] [485] [550] [620] [550] [620] [690]
Elongat
...