ASTM A288-91(1998)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 288 – 91 (Reapproved 1998)
Standard Specification for
Carbon and Alloy Steel Forgings for Magnetic Retaining
Rings for Turbine Generators
This standard is issued under the fixed designation A 288; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.3 Discard—Sufficient discard shall be made from each
ingot to secure freedom from piping and undue segregation.
1.1 This specification covers quenched and tempered carbon
4.4 Heat Treatment:
and alloy steel forgings for magnetic retaining rings for turbine
4.4.1 Heat Treatment for Mechanical Properties—Heat
generators.
treatment for properties shall be by quenching and tempering.
1.2 Supplementary requirements of an optional nature are
4.4.2 Tempering Temperature—The final tempering tem-
provided. These shall apply only when specified by the
perature shall be not less than 1100°F (595°C).
purchaser.
4.5 Machining:
1.3 The values stated in inch-pound units are to be regarded
4.5.1 Preliminary Machining—Forgings shall be machined
as the standard.
all over prior to quenching and tempering for mechanical
2. Referenced Documents properties.
4.5.2 Machine to Purchaser’s Requirements for
2.1 ASTM Standards:
Shipment—If required, forgings shall be machined to the
A 275/A 275M Test Method for Magnetic Particle Exami-
dimensions shown on the purchaser’s drawing prior to ship-
nation of Steel Forgings
ment.
A 531/A 531M Practice for Ultrasonic Inspection of
Turbine-Generator Steel Retaining Rings
5. Chemical Composition
A 788 Specification for Steel Forgings, General Require-
5.1 The steel shall conform to the chemical composition
ments
prescribed in Table 1.
3. Ordering Information 5.2 Heat Analysis—The heat analysis obtained from sam-
pling in accordance with Specification A 788 shall comply with
3.1 In addition to the ordering information required by
Table 1.
Specification A 788, the purchaser shall include with the
5.3 Product Analysis—The purchaser may use the product
inquiry and order a detailed drawing, sketch or written descrip-
analysis provision of Table 1 of Specification A 788 to obtain
tion of the forging, including the number and location of
a product analysis from a forging representing each heat or
mechanical test specimens.
multiple heat.
4. Manufacture
6. Mechanical Properties
4.1 The melting processes of Specification A 788 shall be
6.1 Tensile Requirements—The material shall conform to
applicable except that the basic electric furnace process shall
the requirements for tensile properties prescribed in Table 2.
be used if separate refining or remelting is not employed.
6.2 Notch Toughness Requirements—The material shall
4.2 Vacuum Degassing—For Class 3 machined forgings
1 conform to the requirements for notch toughness as prescribed
over 2 ⁄2 in. (63.5 mm) wall thickness, and Classes 4 to 8, the
in Table 2.
molten steel shall be vacuum treated immediately prior to or
during the operation of pouring the ingot in order to remove
7. General Requirements
objectionable gases, especially hydrogen.
7.1 Material supplied to this specification shall conform to
the requirements of Specification A 788 which outlines addi-
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
tional ordering information, manufacturing, requirements, test-
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
ing and retesting methods, and procedures, marking, certifica-
A01.06 on Steel Forgings and Billets.
tion, product analysis variations, and additional supplementary
Current edition approved Dec. 15, 1991. Published February 1992. Originally
requirements.
published as A 288 – 46 T. Last previous edition A 288 – 90.
Annual Book of ASTM Standards, Vol 01.05.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 288 – 91 (1998)
TABLE 1 Chemical Requirements
at midwall and at a distance at least equal to on
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