ASTM A204/A204M-93(1999)
(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 Material under this specification is available in three grades having different strength levels as follows: Tensile Strength, Grade 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: Maximum Thickness, Grade 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 – 93 (Reapproved 1999)
Standard Specification for
Pressure Vessel Plates, Alloy Steel, Molybdenum
This standard is issued under the fixed designation A 204/A 204M; 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
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
Examination of Steel Plates
pressure vessels.
A 578/A 578M Specification for Straight-Beam Ultrasonic
1.2 Material under this specification is available in three
Examination of Plain and Clad Steel Plates for Special
grades having different strength levels as follows:
Applications
Tensile Strength,
Grade ksi [MPa]
3. General Requirements and Ordering Information
A 65–85 [450–585]
B 70–90 [485–620]
3.1 Material supplied to this material specification shall
C 75–95 [515–655]
conform to Specification A 20/A 20M. These requirements
1.3 The maximum thickness of plates is limited only by the
outline the testing and retesting methods and procedures,
capacity of the composition to meet the specified mechanical
permissible variations in dimensions and mass, quality and
property requirements; however, current practice normally
repair of defects, marking, 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:
the ordering information that should be complied with when
Maximum Thickness,
purchasing material to this specification.
Grade in. [mm]
3.3 In addition to the basic requirements of this specifica-
A 6 [150]
B 6 [150] tion, certain supplementary requirements are available when
C 4 [100]
additional control, testing, or examination is required to meet
end use requirements. These include:
1.4 The values stated in either inch-pound units or SI units
3.3.1 Vacuum treatment,
are to be regarded separately as standard. Within the text, the
3.3.2 Additional or special tension testing,
SI units are shown in brackets. The values stated in each
3.3.3 Impact testing, and
system are not exact equivalents; therefore, each system must
3.3.4 Nondestructive examination.
be used independently of the other. Combining values from the
3.4 The purchaser is referred to the listed supplementary
two systems may result in nonconformance with this specifi-
requirements in this specification and to the detailed require-
cation.
ments in Specification A 20/A 20M.
2. Referenced Documents
3.5 If the requirements of this specification are in conflict
with the requirements of Specification A 20/A 20M, the re-
2.1 ASTM Standards:
quirements of this specification shall prevail.
A 20/A 20M Specification for General Requirements for
Steel Plates for Pressure Vessels
4. Manufacture
4.1 Steelmaking Practice—The steel shall be killed.
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
5. Heat Treatment
A01.11 on Steel Plates for Boilers and Pressure Vessels.
5.1 Plates 1 ⁄2 in. [40 mm] and under in thickness are
Current edition approved June 15, 1993. Published August 1993. Originally
published as A204 – 37 T. Last previous edition A204/A 204M– 90. normally supplied in the as-rolled condition. The plates may be
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
ordered normalized or stress relieved or both.
cation SA-204/SA 204M in Section II of that Code.
Annual Book of ASTM Standards, Vol. 01.04.
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