ASTM A844/A844M-09

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. (This 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 The maximum nominal thickness of plates furnished under this specification shall not exceed 2 in. [50 mm].  
1.4 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.  
1.5 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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2009
• 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

Relations

• Replaces: ASTM A844/A844M-04 - Standard Specification for Steel Plates, 9 % Nickel Alloy, for Pressure Vessels, Produced by the Direct-Quenching Process
• Effective Date: 01-Oct-2009
• Referred By: ASTM A20/A20M-20 - Standard Specification for General Requirements for Steel Plates for Pressure Vessels
• Effective Date: 01-Oct-2009

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:A844/A844M −09
StandardSpecification 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* Examination of Steel Plates
A577/A577MSpecification for Ultrasonic Angle-Beam Ex-
1.1 This specification covers 9% nickel-alloy steel plates
amination of Steel Plates
produced by the direct-quenching process. The plates are
A578/A578MSpecification for Straight-Beam Ultrasonic
intended primarily for use in welded pressure vessels.
Examination of Rolled Steel Plates for Special Applica-
1.2 The direct-quenching process consists of quenching the
tions
plates directly after rolling, without permitting the plates to
3. General Requirements and Ordering Information
cool below the critical temperature prior to initiation of the
quenching operation, and subsequently tempering the plates.
3.1 Material supplied to this material specification shall
(This differs from the “conventional” process in which the
conform to Specification A20/A20M. These requirements out-
plates are permitted to cool to a temperature significantly
line the testing and retesting methods and procedures, permit-
below the critical temperature, usually to ambient temperature,
ted variations in dimensions, quality and repair of defects,
prior to reheating to a temperature above the upper critical
marking, loading, and ordering information.
temperature, then quenching, and subsequently tempering.)
3.2 In addition to the basic requirements of this
1.3 The maximum nominal thickness of plates furnished
specification,certainsupplementaryrequirementsareavailable
under this specification shall not exceed 2 in. [50 mm].
when additional control, testing, or examination is required to
meet end use requirements. The purchaser is referred to the
1.4 This material is susceptible to magnetization. Use of
listed supplementary requirements in this specification and to
magnets in handling after heat treatment should be avoided if
the detailed requirements in Specification A20/A20M.
residual magnetism would be detrimental to subsequent fabri-
cation or service.
3.3 If the requirements of this specification are in conflict
withtherequirementsofSpecificationA20/A20M,therequire-
1.5 The values stated in either inch-pound or SI units are to
ments of this specification shall prevail.
beregardedseparatelyasstandard.Withinthetext,theSIunits
areshowninbrackets.Thevaluesstatedineachsystemarenot
4. Manufacture
exact equivalents; therefore each system must be used inde-
4.1 Steelmaking Practice—The steel shall be killed and
pendentlyoftheother.Combiningvaluesfromthetwosystems
shall conform to the fine austenitic grain size requirement of
may result in nonconformance with the specification.
Specification A20/A20M.
2. Referenced Documents
4.2 Heat Treatment:
2
2.1 ASTM Standards: 4.2.1 The plates shall be quenched directly after rolling,
A20/A20MSpecificationforGeneralRequirementsforSteel without being allowed to cool below 1205°F [650°C]. The
Plates for Pressure Vessels quenching shall be initiated from a temperature within the
A435/A435MSpecification for Straight-Beam Ultrasonic range from 1205 to 1670°F [650 to 910°C]. (The temperature
shall be reported in accordance with 19.2 of Specification
A20/A20M.)
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
4.2.2 Subsequent to quenching, the plates shall be tempered
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
within the range from 1050 to 1175°F [565 to 635°C], holding
A01.11 on Steel Plates for Boilers and Pressure Vessels.
at that temperature for a minimum of 30 min/in. [1.2 min/mm]
Current edition approved Oct. 1, 2009. Published October 2009. Originally
of thickness but for not less than 15 min., and then cooling at
approved in 1985. Last previous edition approved in 2004 as A844/A844M–04).
DOI: 10.1520/A0844_A0844M-09.
a rate of not less than 300°F/h [165°C/h], either in air or by
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
quenching in water, to ambient temperature.
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.2.2.1 Prior to the tempering treatment, the plates may be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. subjected to an intermediate heat treatment consisting of
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C
...

This document is not anASTM standard and is intended only to provide the user of anASTM 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–04 Designation: A844/A844M – 09
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*
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. (This 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 The maximum nominal thickness of plates furnished under this specification shall not exceed 2 in. [50 mm].
1.4 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.
1.5 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.
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
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
3. General Requirements and Ordering Information
3.1 Material supplied to this material specification shall conform to Specification A20/A20M. These requirements outline the
testingandretestingmethodsandprocedures,permissiblevariationsindimensions,qualityandrepairofdefects,marking,loading,
etc.
3.2Specification . 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 Inadditiontothebasicrequirementsofthisspecification,certainsupplementaryrequirementsareavailablewhenadditional
control, testing, or examination is required to meet end use requirements. The purchaser is referred to the listed supplementary
requirementsinthisspecificationandtothedetailedrequirementsinSpecificationA20/A20Malsoestablishestherulesforordering
information that should be complied with when purchasing material to this specification.
3.3In 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. These include:
3.3.1Vacuum treatment,
3.3.2Additional or special tension testing,
3.3.3Additional or special impact testing, and
3.3.4Nondestructive examination.
1
ThisspecificationisunderthejurisdictionofASTMCommitteeA01onSteel,StainlessSteelandRelatedAlloysandisthedirectresponsibilityofSubcommitteeA01.11
on Steel Plates for Boilers and Pressure Vessels.
CurrenteditionapprovedOct.1,2004.2009.PublishedOctober2004.2009.Originallyapprovedin1985.Lastpreviouseditionapprovedin19992004asA844/A844M–93
(1999). A844/A844M–04). DOI: 10.1520/A0844_A0844M-049.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,[e-mail]ards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*ASummary 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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A844/A844M – 09
3.4The purchaser is referred to
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