ASTM A508/A508M-05a
(Specification)Standard Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels
Standard Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels
SCOPE
1.1 This specification covers quenched and tempered vacuum treated carbon and alloy steel forgings for pressure vessels such as those used in reactor systems. Specifically, it covers forgings for vessel closures, shells, flanges, tube sheets, rings, heads, and similar parts.
1.2 All grades are considered weldable under proper conditions. Welding technique is of fundamental importance, and it is presupposed that welding procedure and inspection will be in accordance with approved methods for the grade of material used.
1.3 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standards. Within the text and the 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.
Note 1—Grades 1 and 1A are composed of different chemistries but have the same mechanical requirements.
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Designation: A 508/A 508M – 05a
Standard Specification for
Quenched and Tempered Vacuum-Treated Carbon and Alloy
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Steel Forgings for Pressure Vessels
This standard is issued under the fixed designationA508/A508M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope*
Grade 22 Class 3 Class 22B
Grade 22 Classes 4, 5, 6, and
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1.1 This specification covers quenched and tempered
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vacuum-treated carbon and alloy steel forgings for pressure
Grade 3V Class 3V
vessels such as those used in reactor systems. Specifically, it
1.5 This standard does not purport to address all of the
covers forgings for vessel closures, shells, flanges, tube sheets,
safety concerns, if any, associated with its use. It is the
rings, heads, and similar parts.
responsibility of the user of this standard to establish appro-
1.2 All grades are considered weldable under proper condi-
priate safety and health practices and determine the applica-
tions. Welding technique is of fundamental importance, and it
bility of regulatory limitations prior to use.
ispresupposedthatweldingprocedureandinspectionwillbein
accordance with approved methods for the grade of material 2. Referenced Documents
3
used.
2.1 ASTM Standards:
1.3 The values stated in either SI units or inch-pound units
A 275/A 275M Test Method for Magnetic Particle Exami-
are to be regarded separately as standard. The values stated in
nation of Steel Forgings
each system may not be exact equivalents; therefore, each
A 370 Test Methods and Definitions for MechanicalTesting
system shall be used independently of the other. Combining
of Steel Products
values from the two systems may result in non-conformance
A 388/A 388M Practice for Ultrasonic Examination of
with the standard.
Heavy Steel Forgings
1.4 Unless the order specifies the applicable “M” specifica-
A 788 Specification for Steel Forgings, General Require-
tion designation, the material shall be furnished to the inch-
ments
pound units.
E 208 Test Method for Conducting Drop-Weight Test to
Determine Nil-Ductility Transition Temperature of Ferritic
NOTE 1—Grades 1 and 1A are composed of different chemistries but
Steels
have the same mechanical requirements.
NOTE 2—Designations have been changed as follows:
E 428 Practice for Fabrication and Control of Steel Refer-
Current Formerly ence Blocks Used in Ultrasonic Inspection
Grade 1 Class 1
2.2 American Society of Mechanical Engineers Standard:
Grade 1A Class 1A
Boiler and Pressure Vessel Code—Section III, Articles
Grade 2 Class 1 Class 2
Grade 2 Class 2 Class 2A NB 2300, NC 2300, ND 2300, NE 2300, NF 2300, NG
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Grade 3 Class 1 Class 3
2300
Grade 3 Class 2 Class 3A
Grade 4N Class 1 Class 4
3. Ordering Information
Grade 4N Class 2 Class 4A
Grade 4N Class 3 Class 4B
3.1 Purchase Order—In addition to the ordering informa-
Grade 5 Class 1 Class 5
tion required by Specification A 788, the purchaser shall
Grade 5 Class 2 Class 5A
include with the inquiry and order a detailed drawing that
locates the areas of significant loading in the forging (when
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
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Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee For referenced ASTM standards, visit the ASTM website, www.astm.org, or
A01.06 on Steel Forgings and Billets. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Sept. 1, 2005. Published September 2005. Originally Standards volume information, refer to the standard’s Document Summary page on
e1
approved in 1964. Last previous edition approved in 2005 asA 508/A 508M – 05 . the ASTM website.
2 4
For ASME Boiler and Pressure Vessel Code applications see related Specifi- Available from American Society of Mechanical Engineers, 345 E. 47th St.,
cation SA-508/SA-508M in Section II of that Code. New York, NY 10017.
*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.
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A 508/A 508M – 05a
required), the method of selecting test locations (see 6.1.5 and treatment may be applied to improve machinability and to
6.1.6), and purchase options (see 4.2.2, 6.2.1, and 10.1) and enhance subsequent heat treatments.
any supplementary requirements desired.
4.2.2 HeatTreatmentforMechanicalProperties—Theforg-
3.2 Forging Drawing—Each forging shall be manufactured ings shall be heated to a temper
...
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