ASTM A266/A266M-21
(Specification)Standard Specification for Carbon Steel Forgings for Pressure Vessel Components
Standard Specification for Carbon Steel Forgings for Pressure Vessel Components
ABSTRACT
This specification covers four grades of carbon steel forgings for boiler and pressure vessel components, and associated equipment. Materials shall be manufactured by melting process and hot-worked forging. Heat and product analyses shall be performed wherein forgings shall conform to chemical requirements for carbon, manganese, phosphorus, sulphur, and silicon. Mechanical properties such as tensile strength, yield strength, elongation, and reduction of area shall be inspected as well. The requirements for annealed, normalized, or normalized and tempered steel forgings, and that for quenched and tempered steel forgings have been specified separately.
SCOPE
1.1 This specification2 covers four grades of carbon steel forgings for boilers, pressure vessels, and associated equipment.
Note 1: Designations have been changed as follows:
Current
Formerly
Grade 1
Class 1
Grade 2
Class 2
Grade 3
Class 3
Grade 4
Class 4
1.2 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.4 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.
1.5 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.
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Standards Content (Sample)
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:A266/A266M −21
Standard Specification for
1
Carbon Steel Forgings for Pressure Vessel Components
This standard is issued under the fixed designationA266/A266M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* A275/A275M Practice for Magnetic Particle Examination of
2 Steel Forgings
1.1 This specification covers four grades of carbon steel
A370 Test Methods and Definitions for Mechanical Testing
forgings for boilers, pressure vessels, and associated equip-
of Steel Products
ment.
A788/A788M Specification for Steel Forgings, General Re-
NOTE 1—Designations have been changed as follows:
quirements
Current Formerly
A1058 Test Methods for Mechanical Testing of Steel
Grade 1 Class 1
Products—Metric
Grade 2 Class 2
E112 Test Methods for Determining Average Grain Size
Grade 3 Class 3
Grade 4 Class 4
E165/E165M Practice for Liquid Penetrant Testing for Gen-
1.2 Supplementary requirements are provided for use when eral Industry
E381 Method of Macroetch Testing Steel Bars, Billets,
additional testing or inspection is desired. These shall apply
only when specified individually by the purchaser in the order. Blooms, and Forgings
4
2.2 Other Standard:
1.3 The values stated in either SI units or inch-pound units
ASME Boiler and Pressure Vessel Code, Section IX
are to be regarded separately as standard. The values stated in
each system are not necessarily exact equivalents; therefore, to
3. Ordering Information and General Requirements
ensure conformance with the standard, each system shall be
3.1 In addition to the ordering information required by
used independently of the other, and values from the two
Specification A788/A788M, the purchaser shall include with
systems shall not be combined.
the inquiry and order a detailed drawing, sketch, or written
1.4 Unless the order specifies the applicable “M” specifica- description of the forging.
tion designation, the material shall be furnished to the inch-
3.2 Material supplied to this specification shall conform to
pound units.
the requirements of Specification A788/A788M, which out-
1.5 This international standard was developed in accor-
lines additional ordering information, manufacturing
dance with internationally recognized principles on standard-
requirements, testing and retesting methods and procedures,
ization established in the Decision on Principles for the
marking, certification, product analysis variations, and addi-
Development of International Standards, Guides and Recom-
tional supplementary requirements.
mendations issued by the World Trade Organization Technical
3.3 If the requirements of this specification are in conflict
Barriers to Trade (TBT) Committee.
with the requirements of Specification A788/A788M, the
requirements of this specification shall prevail.
2. Referenced Documents
3 3.4 ForhubbedflatheadsandtubesheetsorderedforASME
2.1 ASTM Standards:
Boiler and Pressure Vessel Code application, Supplementary
Requirement S12 of Specification A788/A788M shall be
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
specified in addition to Supplementary Requirement S8 of this
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
specification.
A01.06 on Steel Forgings and Billets.
Current edition approved May 1, 2021. Published May 2021. Originally
4. Materials and Manufacture
approved in 1943. Last previous edition approved in 2020 as A266/A266M – 20.
DOI: 10.1520/A0266_A0266M-21.
4.1 The steel shall be made in accordance with the Melting
2
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
Process Section of Specification A788/A788M. A sufficient
cation SA–266/SA–266M in Section II of that code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from American Society of Mechanical Engineers (ASME), ASME
Standards volume information, refer to the standard’s Document Summary page on International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
the ASTM website. www.asme.org.
*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 ----------------------
...
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: A266/A266M − 20 A266/A266M − 21
Standard Specification for
1
Carbon Steel Forgings for Pressure Vessel Components
This standard is issued under the fixed designation A266/A266M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
2
1.1 This specification covers four grades of carbon steel forgings for boilers, pressure vessels, and associated equipment.
NOTE 1—Designations have been changed as follows:
Current Formerly
Grade 1 Class 1
Grade 2 Class 2
Grade 3 Class 3
Grade 4 Class 4
1.2 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when
specified individually by the purchaser in the order.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.4 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.
1.5 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
3
2.1 ASTM Standards:
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
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 Nov. 1, 2020May 1, 2021. Published November 2020May 2021. Originally approved in 1943. Last previous edition approved in 20182020 as
A266/A266M – 18.A266/A266M – 20. DOI: 10.1520/A0266_A0266M-20.10.1520/A0266_A0266M-21.
2
For ASME Boiler and Pressure Vessel Code applications, see related Specification SA–266/SA–266M in Section II of that code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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 ----------------------
A266/A266M − 21
A788/A788M Specification for Steel Forgings, General Requirements
A1058 Test Methods for Mechanical Testing of Steel Products—Metric
E112 Test Methods for Determining Average Grain Size
E165/E165M Practice for Liquid Penetrant Testing for General Industry
E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings
4
2.2 Other Standard:
ASME Boiler and Pressure Vessel Code, Section IX
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 detailed drawing, sketch, or written description of the forging.
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,
product analysis variations, and additional supplementary requirements.
3.3 If the requirements of this specification are in conflict with the requirements of Specification A788/A788M, the requirements
of this specification shall prevail.
3.4 For hubbed flat heads and tube sheets ordered for ASME Boiler and Pressure Vessel Code application, Supplementary
Requirement S12 of Specification A788/A788M shall be specified in addition to Supplementary Requirement S8 of this
specification.
4. Materials and Manu
...
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