ASTM A844/A844M-21

Standard Specification for Steel Plates, 9 %  Nickel Alloy, for Pressure Vessels, Produced by the Direct-Quenching Process

ABSTRACT
This specification covers 9% nickel-alloy steel plates produced by the direct-quenching process. The plates are intended primarily for use in welded pressure vessels. The steel shall be killed and shall conform to the fine austenitic grain size requirement specified. The steel shall conform to the chemical requirements specified. Tension test and impact test shall be made to conform to the requirements specified.
SCOPE
1.1 This specification covers 9 % nickel-alloy steel plates produced by the direct-quenching process. The plates are intended primarily for use in welded pressure vessels.  
1.2 The direct-quenching process consists of quenching the plates directly after rolling, without permitting the plates to cool below the critical temperature prior to initiation of the quenching operation, and subsequently tempering the plates (see Appendix X1). (Note: The direct-quenching process differs from the “conventional” process in which the plates are permitted to cool to a temperature significantly below the critical temperature, usually to ambient temperature, prior to reheating to a temperature above the upper critical temperature, then quenching, and subsequently tempering.)  
1.3 If the plates are subjected to warm forming, the temperature shall not exceed 950°F [510°C].  
1.4 The maximum nominal thickness of plates furnished under this specification shall not exceed 2 in. [50 mm].  
1.5 This material is susceptible to magnetization. Use of magnets in handling after heat treatment should be avoided if residual magnetism would be detrimental to subsequent fabrication or service.  
1.6 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.  
1.7 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: Published
• Publication Date: 31-Oct-2021
• ICS: 77.140.30 - Steels for pressure purposes
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.11 - Steel Plates for Boilers and Pressure Vessels

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:A844/A844M −21
Standard Specification for
Steel Plates, 9% Nickel Alloy, for Pressure Vessels,
1
Produced by the Direct-Quenching Process
This standard is issued under the fixed designationA844/A844M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
1.1 This specification covers 9% nickel-alloy steel plates 2.1 ASTM Standards:
produced by the direct-quenching process. The plates are A20/A20MSpecificationforGeneralRequirementsforSteel
intended primarily for use in welded pressure vessels. Plates for Pressure Vessels
A435/A435MSpecification for Straight-Beam Ultrasonic
1.2 The direct-quenching process consists of quenching the
Examination of Steel Plates
plates directly after rolling, without permitting the plates to
A577/A577MSpecification for Ultrasonic Angle-Beam Ex-
cool below the critical temperature prior to initiation of the
amination of Steel Plates
quenching operation, and subsequently tempering the plates
A578/A578MSpecification for Straight-Beam Ultrasonic
(see Appendix X1). (Note: The direct-quenching process
Examination of Rolled Steel Plates for Special Applica-
differs from the “conventional” process in which the plates are
tions
permitted to cool to a temperature significantly below the
A841/A841MSpecification for Steel Plates for Pressure
critical temperature, usually to ambient temperature, prior to
Vessels, Produced by Thermo-Mechanical Control Pro-
reheatingtoatemperatureabovetheuppercriticaltemperature,
cess (TMCP)
then quenching, and subsequently tempering.)
1.3 If the plates are subjected to warm forming, the tem-
3. General Requirements and Ordering Information
perature shall not exceed 950°F [510°C].
3.1 Material supplied to this material specification shall
1.4 The maximum nominal thickness of plates furnished
conform to Specification A20/A20M. These requirements out-
under this specification shall not exceed 2 in. [50 mm].
line the testing and retesting methods and procedures, permit-
1.5 This material is susceptible to magnetization. Use of ted variations in dimensions, quality and repair of defects,
magnets in handling after heat treatment should be avoided if marking, loading, and ordering information.
residual magnetism would be detrimental to subsequent fabri-
3.2 In addition to the basic requirements of this
cation or service.
specification,certainsupplementaryrequirementsareavailable
1.6 The values stated in either inch-pound or SI units are to when additional control, testing, or examination is required to
beregardedseparatelyasstandard.Withinthetext,theSIunits meet end use requirements. The purchaser is referred to the
areshowninbrackets.Thevaluesstatedineachsystemarenot listed supplementary requirements in this specification and to
exact equivalents; therefore each system must be used inde- the detailed requirements in Specification A20/A20M.
pendentlyoftheother.Combiningvaluesfromthetwosystems
3.3 If the requirements of this specification are in conflict
may result in nonconformance with the specification.
withtherequirementsofSpecificationA20/A20M,therequire-
1.7 This international standard was developed in accor-
ments of this specification shall prevail.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Manufacture
Development of International Standards, Guides and Recom-
4.1 Steelmaking Practice—The steel shall be killed and
mendations issued by the World Trade Organization Technical
shall conform to the fine austenitic grain size requirement of
Barriers to Trade (TBT) Committee.
Specification A20/A20M.
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
2
A01.11 on Steel Plates for Boilers and Pressure Vessels. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2021. Published November 2021. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1985. Last previous edition approved in 2015 as A844/A844M–09 Standards volume information, refer to the standard’s Document Summary page on
(2015). DOI: 10.1520/A0844_A0844M-21. 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. Unit
...

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: A844/A844M − 09 (Reapproved 2015) A844/A844M − 21
Standard Specification for
Steel Plates, 9 % Nickel Alloy, for Pressure Vessels,
1
Produced by the Direct-Quenching Process
This standard is issued under the fixed designation A844/A844M; 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 9 % nickel-alloy steel plates produced by the direct-quenching process. The plates are intended
primarily for use in welded pressure vessels.
1.2 The direct-quenching process consists of quenching the plates directly after rolling, without permitting the plates to cool below
the critical temperature prior to initiation of the quenching operation, and subsequently tempering the plates. (Thisplates (see
Appendix X1). (Note: The direct-quenching process differs from the “conventional” process in which the plates are permitted to
cool to a temperature significantly below the critical temperature, usually to ambient temperature, prior to reheating to a
temperature above the upper critical temperature, then quenching, and subsequently tempering.)
1.3 If the plates are subjected to warm forming, the temperature shall not exceed 950°F [510°C].
1.4 The maximum nominal thickness of plates furnished under this specification shall not exceed 2 in. [50 mm].
1.5 This material is susceptible to magnetization. Use of magnets in handling after heat treatment should be avoided if residual
magnetism would be detrimental to subsequent fabrication or service.
1.6 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are
shown in brackets. The values stated in each system are not exact equivalents; therefore each system must be used independently
of the other. Combining values from the two systems may result in nonconformance with the specification.
1.7 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:
A20/A20M Specification for General Requirements for Steel Plates for Pressure Vessels
A435/A435M Specification for Straight-Beam Ultrasonic Examination of Steel Plates
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 A01.11
on Steel Plates for Boilers and Pressure Vessels.
Current edition approved Sept. 1, 2015Nov. 1, 2021. Published September 2015November 2021. Originally approved in 1985. Last previous edition approved in 20092015
as A844/A844M – 09.A844/A844M – 09 (2015). DOI: 10.1520/A0844_A0844M-09R15.10.1520/A0844_A0844M-21.
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

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A844/A844M − 21
A577/A577M Specification for Ultrasonic Angle-Beam Examination of Steel Plates
A578/A578M Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications
A841/A841M Specification for Steel Plates for Pressure Vessels, Produced by Thermo-Mechanical Control Process (TMCP)
3. General Requirements and Ordering Information
3.1 Material supplied to this material specification shall conform to Specification A20/A20M. These requirements outline the
testing and retesting methods and procedures, permitted variations in dimensions, quality and repair of defects, marking, loading,
and ordering information.
3.2 In addition to the basic requirements of this specification, certain supplementary requirements are available when additional
control, testing, or examination is required to meet end use requirements. The purchaser is referred to the listed supplementary
requirements in this specifi
...