ASTM A844/A844M-04
(Specification)Standard Specification for Steel Plates, 9 % Nickel Alloy, for Pressure Vessels, Produced by the Direct-Quenching Process
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
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 – 04
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* A435/A435M Specification for Straight-Beam Ultrasonic
Examination of Steel Plates
1.1 This specification covers 9% nickel-alloy steel plates
A577/A577M Specification for UltrasonicAngle-Beam Ex-
produced by the direct-quenching process. The plates are
amination of Steel Plates
intended primarily for use in welded pressure vessels.
A578/A578M Specification for Straight-Beam Ultrasonic
1.2 The direct-quenching process consists of quenching the
Examination of Rolled Steel Plates for Special Applica-
plates directly after rolling, without permitting the plates to
tions
cool below the critical temperature prior to initiation of the
quenching operation, and subsequently tempering the plates.
3. General Requirements and Ordering Information
(This differs from the “conventional” process in which the
3.1 Material supplied to this material specification shall
plates are permitted to cool to a temperature significantly
conform to SpecificationA20/A20M. These requirements out-
below the critical temperature, usually to ambient temperature,
line the testing and retesting methods and procedures, permis-
prior to reheating to a temperature above the upper critical
sible variations in dimensions, quality and repair of defects,
temperature, then quenching, and subsequently tempering.)
marking, loading, etc.
1.3 The maximum nominal thickness of plates furnished
3.2 Specification A20/A20M also establishes the rules for
under this specification shall not exceed 2 in. [50 mm].
ordering information that should be complied with when
1.4 This material is susceptible to magnetization. Use of
purchasing material to this specification.
magnets in handling after heat treatment should be avoided if
3.3 In addition to the basic requirements of this specifica-
residual magnetism would be detrimental to subsequent fabri-
tion, certain supplementary requirements are available when
cation or service.
additional control, testing, or examination is required to meet
1.5 The values stated in either inch-pound or SI units are to
end use requirements. These include:
beregardedseparatelyasstandard.Withinthetext,theSIunits
3.3.1 Vacuum treatment,
areshowninbrackets.Thevaluesstatedineachsystemarenot
3.3.2 Additional or special tension testing,
exact equivalents; therefore each system must be used inde-
3.3.3 Additional or special impact testing, and
pendentlyoftheother.Combiningvaluesfromthetwosystems
3.3.4 Nondestructive examination.
may result in nonconformance with the specification.
3.4 The purchaser is referred to the listed supplementary
2. Referenced Documents requirements in this specification and to the detailed require-
2 ments in Specification A20/A20M.
2.1 ASTM Standards:
3.5 If the requirements of this specification are in conflict
A20/A20M Specification for General Requirements for
withtherequirementsofSpecificationA20/A20M,therequire-
Steel Plates for Pressure Vessels
ments of this specification shall prevail.
1 4. Manufacture
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel,
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
4.1 Steelmaking Practice—The steel shall be killed and
A01.11 on Steel Plates for Boilers and Pressure Vessels.
shall conform to the fine austenitic grain size requirement of
Current edition approved Oct. 1, 2004. Published October 2004. Originally
Specification A20/A20M.
approved in 1985. Last previous edition approved in 1999 as A844/A844M–93
(1999). DOI: 10.1520/A0844_A0844M-04.
4.2 Heat Treatment:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2.1 The plates shall be quenched directly after rolling,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
without being allowed to cool below 1205°F [650°C]. The
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. quenching shall be initiated from a temperature within the
*ASummary of Changes section appears at the end of this standard.
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A844/A844M – 04
TABLE 1 Chemical Requirements TABLE 2 Tensile Requiremments
Element Composition, % Tensile strength, ksi [MPa] 100 to 120 [690–825]
Yield
...
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