ASTM A288-18(2023)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A288 − 18 (Reapproved 2023)
Standard Specification for
Carbon and Alloy Steel Forgings for Magnetic Retaining
Rings for Turbine Generators
This standard is issued under the fixed designation A288; 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 description of the forging, including the number and location
of mechanical test specimens.
1.1 This specification covers quenched and tempered carbon
and alloy steel forgings for magnetic retaining rings for turbine
4. Manufacture
generators.
4.1 The melting processes of Specification A788/A788M
1.2 Supplementary requirements of an optional nature are
shall be applicable except that the basic electric furnace
provided. These shall apply only when specified by the
process shall be used if separate refining or remelting is not
purchaser.
employed.
1.3 The values stated in inch-pound units are to be regarded
4.2 Vacuum Degassing—Steel shall be vacuum degassed per
as standard. The values given in parentheses are mathematical
any method listed in Specification A788/A788M.
conversions to SI units that are provided for information only
4.3 Discard—Sufficient discard shall be made from each
and are not considered standard.
ingot to secure freedom from piping and undue segregation.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- 4.4 Heat Treatment:
ization established in the Decision on Principles for the 4.4.1 Heat Treatment for Mechanical Properties—Heat
Development of International Standards, Guides and Recom- treatment for properties shall be by quenching and tempering.
mendations issued by the World Trade Organization Technical Forgings may be normalized prior to quenching and tempering.
Barriers to Trade (TBT) Committee. 4.4.2 Tempering Temperature—The final tempering tem-
perature shall be not less than 1100 °F (595 °C).
2. Referenced Documents
4.5 Machining:
2.1 ASTM Standards:
4.5.1 Preliminary Machining—Forgings shall be machined
A275/A275M Practice for Magnetic Particle Examination of
all over prior to quenching and tempering for mechanical
Steel Forgings
properties.
A531/A531M Practice for Ultrasonic Examination of
4.5.2 Machine to Purchaser’s Requirements for
Turbine-Generator Steel Retaining Rings
Shipment—If required, forgings shall be machined to the
A788/A788M Specification for Steel Forgings, General Re-
dimensions shown on the purchase order prior to shipment.
quirements
5. Chemical Composition
3. Ordering Information
5.1 The steel shall conform to the chemical composition
3.1 In addition to the ordering information required by
prescribed in Table 1.
Specification A788/A788M, the purchaser shall include with
5.2 Heat Analysis—The heat analysis obtained from sam-
the inquiry and order a detailed drawing, sketch, or written
pling in accordance with Specification A788/A788M shall
comply with Table 1.
1 5.3 Product Analysis—The purchaser may use the product
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee analysis provision of Table 1 of Specification A788/A788M to
A01.06 on Steel Forgings and Billets.
obtain a product analysis from a forging representing each heat
Current edition approved March 15, 2023. Published April 2023. Originally
or multiple heat.
approved in 1946. Last previous edition approved in 2018 as A288 – 18. DOI:
10.1520/A0288-18R23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Mechanical Properties
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1 Tensile Requirements—The material shall conform to
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the requirements for tensile properties prescribed in Table 2.
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A288 − 18 (2023)
TABLE 1 Chemical Requirements
8. Sampling
Class 1, % Classes 2 Classes 4, 5, 6, 7,
8.1 Test Location—Tension and notch toughness test speci-
and 3, % and 8, %
mens shall be taken tangentially from prolongations on one or
Carbon, max 0.50 max 0.45 max 0.45
both ends of the forging. The direction of the notch of the
Manganese 0.60–1.00 0.60–1.00 1.00 max
Phosp
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