ASTM A288-18

Standard Specification for Carbon and Alloy Steel Forgings for Magnetic Retaining Rings for Turbine Generators

ABSTRACT
This specification covers quenched and tempered carbon and alloy steel forgings for magnetic retaining rings for turbine generators. Specimens shall be manufactured by melting process and vacuum degassing. Forgings shall also undergo preliminary machining prior to heat treatment (quenching and tempering) for mechanical properties testing. Steel materials shall conform to tensile and notch toughness requirements, which include tensile strength, yield strength, elongation, reduction of area, and Charpy V-notch impact strength. Heat and product analyses shall be performed as well wherein specimens shall conform to chemical requirements of carbon, manganese, phosphorus, sulfur, nickel, chromium, molybdenum, and vanadium. Nondestructive tests such as magnetic particle test and ultrasonic inspection may also be performed.
SCOPE
1.1 This specification covers quenched and tempered carbon and alloy steel forgings for magnetic retaining rings for turbine generators.  
1.2 Supplementary requirements of an optional nature are provided. These shall apply only when specified by the purchaser.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.4 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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2018
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A288 − 18
Standard Specification for
Carbon and Alloy Steel Forgings for Magnetic Retaining
1
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
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,
analysis provision of Table 1 of Specification A788/A788M to
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
obtain a product analysis from a forging representing each heat
Current edition approved May 1, 2018. Published May 2018. Originally
or multiple heat.
approved in 1946. Last previous edition approved in 2018 as A288 – 91(2018).
DOI: 10.1520/A0288-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6. Mechanical Properties
contact ASTM Customer Service at [e-mail]. 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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A288 − 18
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
Phosphorus, max 0.025 0.025 0.025
Charpy bars shall be radial. All test specimens shall be located
Sulfur, max 0.025 0.020 0.020
at midwall
...

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: A288 − 91 (Reapproved 2018) A288 − 18
Standard Specification for
Carbon and Alloy Steel Forgings for Magnetic Retaining
1
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 Scope*
1.1 This specification covers quenched and tempered carbon and alloy steel forgings for magnetic retaining rings for turbine
generators.
1.2 Supplementary requirements of an optional nature are provided. These shall apply only when specified by the purchaser.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.4 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A531/A531M Practice for Ultrasonic Examination of Turbine-Generator Steel Retaining Rings
A788/A788M Specification for Steel Forgings, General Requirements
3. Ordering Information
3.1 In addition to the ordering information required by Specification A788/A788M, the purchaser shall include with the inquiry
and order a detailed drawing, sketch, or written description of the forging, including the number and location of mechanical test
specimens.
4. Manufacture
4.1 The melting processes of Specification A788/A788M shall be applicable except that the basic electric furnace process shall
be used if separate refining or remelting is not employed.
1
4.2 Vacuum Degassing—For Class 3 machined forgings over 2Steel ⁄2 in. (63.5 mm) wall thickness, and Classes 4 to 8, the
molten steel shall be vacuum treated immediately prior to or during the operation of pouring the ingot in orderdegassed per any
method listed in Specification A788/A788Mto remove objectionable gases, especially hydrogen.
4.3 Discard—Sufficient discard shall be made from each ingot to secure freedom from piping and undue segregation.
4.4 Heat Treatment:
4.4.1 Heat Treatment for Mechanical Properties—Heat treatment for properties shall be by quenching and tempering. Forgings
may be normalized prior to quenching and tempering.
4.4.2 Tempering Temperature—The final tempering temperature shall be not less than 1100 °F (595 °C).
4.5 Machining:
4.5.1 Preliminary Machining—Forgings shall be machined all over prior to quenching and tempering for mechanical properties.
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 March 1, 2018May 1, 2018. Published March 2018May 2018. Originally approved in 1946. Last previous edition approved in 20132018 as
A288 – 91(2013).(2018). DOI: 10.1520/A0288-91R18.10.1520/A0288-18.
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’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A288 − 18
4.5.2 Machine to Purchaser’s Requirements for Shipment—If required, forgings shall be machined to the dimensions shown on
the purchaser’s drawingpurchase order prior to shipment.
5. Chemical Composition
5.1 The steel shall conform to the chemical composition prescribed in Table 1.
5.2 Heat Analysis—The heat analysis obtained from sampling in accordance with Specification A788/A788M shall comply with
Table 1.
5.3 Product Analysis—The purchaser may use the product analysis provision of Table 1 of Specification A788/A788M to obtain
a product analysis from a forging representing each heat or multiple heat.
6. Mechanical Properties
6.1 Tensile
...