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ASTM A844.pdf
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ASTM A844.pdf
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Designation: A 844/A 844M – 04
Standard Specification for
Steel Plates, 9 % Nickel Alloy, for Pressure Vessels,
Produced by the Direct-Quenching Process
1
This standard is issued under the fixed designation A 844/A 844M; 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.
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 fabri-
cation 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 inde-
pendently of the other. Combining values from the two systems
may result in nonconformance with the specification.
2. Referenced Documents
2.1 ASTM Standards:
2
A 20/A20M Specification for General Requirements for
Steel Plates for Pressure Vessels
A 435/A435M Specification for Straight-Beam Ultrasonic
Examination of Steel Plates
A 577/A577M Specification for Ultrasonic Angle-Beam
Examination of Steel Plates
A 578/A578M Specification for Straight-Beam Ultrasonic
Examination of Plain and Clad Steel Plates for Special
Applications
3. General Requirements and Ordering Information
3.1 Material supplied to this material specification shall
conform to Specification A 20/A 20M. These requirements
outline the testing and retesting methods and procedures,
permissible variations in dimensions, quality and repair of
defects, marking, loading, etc.
3.2 Specification A 20/A 20M also establishes the rules for
ordering information that should be complied with when
purchasing material to this specification.
3.3 In addition to the basic requirements of this specifica-
tion, certain supplementary requirements are available when
additional control, testing, or examination is required to meet
end use requirements. These include:
3.3.1 Vacuum treatment,
3.3.2 Additional or special tension testing,
3.3.3 Additional or special impact testing, and
3.3.4 Nondestructive examination.
3.4 The purchaser is referred to the listed supplementary
requirements in this specification and to the detailed require-
ments in Specification A 20/A 20M.
3.5 If the requirements of this specification are in conflict
with the requirements of Specification A 20/A 20M, the re-
quirements of this specification shall prevail.
4. Manufacture
4.1 Steelmaking Practice—The steel shall be killed and
shall conform to the fine austenitic grain size requirement of
Specification A 20/A 20M.
4.2 Heat Treatment:
4.2.1 The plates shall be quenched directly after rolling,
without being allowed to cool below 1205°F [650°C]. The
quenching shall be initiated from a temperature within the
range from 1205 to 1670°F [650 to 910°C]. (The temperature
shall be reported in accordance with 19.2 of Specification
A 20/A 20M.)
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 Oct. 1, 2004. Published October 2004. Originally
approved in 1985. Last previous edition approved in 1999 as A 844/A 844M – 93
(1999).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1
*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.
Copyright ASTM International
Reproduced by IHS under license with ASTM
Not for Resale
No reproduction or networking permitted without license from IHS
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