ASTM A204/A204M-03
(Specification)Standard Specification for Pressure Vessel Plates, Alloy Steel, Molybdenum
Standard Specification for Pressure Vessel Plates, Alloy Steel, Molybdenum
SCOPE
1.1 This specification covers molybdenum-alloy steel plates, intended particularly for welded boilers and other pressure vessels.
1.2 Plates under this specification are available in three grades having different strength levels as follows: Grade Tensile Strength,ksi [MPa]A 65-85 [450-585]B 70-90 [485-620]C 75-95 [515-655]
1.3 The maximum thickness of plates is limited only by the capacity of the composition to meet the specified mechanical property requirements; however, current practice normally limits the maximum thickness of plates furnished under this specification as follows: Grade Maximum Thickness,in. [mm]A 6 [150]B 6 [150]C 4 [100]
1.4 The values stated in either inch-pound units 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 this specification.
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Designation: A 204/A 204M – 03
Standard Specification for
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Pressure Vessel Plates, Alloy Steel, Molybdenum
This standard is issued under the fixed designationA204/A204M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* A 435/A 435M Specification for Straight-Beam Ultrasonic
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2 Examination of Steel Plates
1.1 This specification covers molybdenum-alloy steel
A 577/A 577M Specification for Ultrasonic Angle-Beam
plates, intended particularly for welded boilers and other
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Examination of Steel Plates
pressure vessels.
A 578/A 578M Specification for Straight-Beam Ultrasonic
1.2 Plates under this specification are available in three
Examination of Plain and Clad Steel Plates for Special
grades having different strength levels as follows:
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Applications
Tensile Strength,
Grade ksi [MPa]
3. General Requirements and Ordering Information
A 65–85 [450–585]
B 70–90 [485–620]
3.1 Plates supplied to this product specification shall con-
C 75–95 [515–655]
form to Specification A 20/A 20M, which outlines the testing
1.3 The maximum thickness of plates is limited only by the
and retesting methods and procedures, permissible variations
capacity of the composition to meet the specified mechanical
in dimensions and mass, quality and repair of defects, marking,
property requirements; however, current practice normally
loading, etc.
limits the maximum thickness of plates furnished under this
3.2 Specification A 20/A 20M also establishes the rules for
specification as follows:
ordering information that should be complied with when
Maximum Thickness,
purchasing plates to this specification.
Grade in. [mm]
3.3 In addition to the basic requirements of this specifica-
A 6 [150]
tion, certain supplementary requirements are available where
B 6 [150]
C 4 [100]
additional control, testing, or examination is required to meet
end use requirements.
1.4 The values stated in either inch-pound units or SI units
3.4 The purchaser is referred to the listed supplementary
are to be regarded separately as standard. Within the text, the
requirements in this specification and to the detailed require-
SI units are shown in brackets. The values stated in each
ments in Specification A 20/A 20M.
system are not exact equivalents; therefore, each system must
3.5 Coils are excluded from qualification to this specifica-
be used independently of the other. Combining values from the
tion until they are processed into finished plates. Plates
two systems may result in nonconformance with this specifi-
produced from coil means plates that have been cut to
cation.
individuallengthsfromcoil.Theprocessordirectlycontrols,or
2. Referenced Documents
is responsible for, the operations involved in the processing of
coils into finished plates. Such operations include decoiling,
2.1 ASTM Standards:
leveling, cutting to length, testing, inspection, conditioning,
A 20/A 20M Specification for General Requirements for
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heat treatment (if applicable), packaging, marking, loading for
Steel Plates for Pressure Vessels
shipment, and certification.
NOTE 1—For plates produced from coil and furnished without heat
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
treatment or with stress relieving only, three test results are reported for
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
each qualifying coil. Additional requirements regarding plates from coil
A01.11 on Steel Plates for Boilers and Pressure Vessels.
are described in Specification A 20/A 20M.
Current edition approved Sept. 10, 2003. Published October 2003. Originally
approved in 1937. Last previous edition approved in 1999 as A204/A 204M– 93
3.6 If the requirements of this specification are in conflict
(1999).
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with the requirements of Specification A 20/A 20M, the re-
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
cation SA-204/SA 204M in Section II of that Code.
quirements of this specification shall prevail.
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Annual Book of ASTM Standards, Vol. 01.04.
*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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A 204/A 204M – 03
4. Materials and Manufacture 6. Chemical Requirements
6.1 The steel shall conform to the chemical requirements
4.1 Steelmaking Practice—The steel shall be killed.
given in Table 1 unless otherwise modified in accordance with
Supplementary Requirement
...
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