Designation: A 302/A 302M – 03
Standard Specification for
Pressure Vessel Plates, Alloy Steel, Manganese-
Molybdenum and Manganese-Molybdenum-Nickel
1
This standard is issued under the fixed designation A 302/A 302M; 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*
1.1 This specification
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covers manganese-molybdenum and
manganese-molybdenum-nickel alloy steel plates intended par-
ticularly for welded boilers and other pressure vessels.
1.2 Plates under this specification are available in four
grades having different strength levels as follows:
Grade Tensile Strength, ksi [MPa] Type
A 75–95 [515–655] Mn-Mo
B 80–100 [550–690] Mn-Mo
C 80–100 [550–690] Mn-Mo-Ni
D 80–100 [550–690] Mn-Mo-Ni
1.3 The maximum thickness of plates is limited only by the
capacity of the chemical composition to meet the specified
mechanical property requirements. The minimum thickness is
limited to 0.25 in. [6.5 mm].
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 the specifi-
cation.
2. Referenced Documents
2.1 ASTM Standards:
A 20/A20M Specification for General Requirements for
Steel Plates for Pressure Vessels
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3. General Requirements and Ordering Information
3.1 Plates supplied to this product specification shall con-
form to Specification A 20/A 20M, which outlines the testing
and retesting methods and procedures, permissible variations
in dimensions and mass, quality and repair of defects, marking,
loading, and so forth.
3.2 Specification A 20/A 20M also establishes the rules for
ordering information that should be complied with when
purchasing plates to this specification.
3.3 In addition to the basic requirements of this specifica-
tion, certain supplementary requirements are available where
additional control, testing, or examination is required to meet
end use requirements.
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 Coils are excluded from qualification to this specifica-
tion until they are processed into finished plates. Plates
produced from coil means plates that have been cut to
individual lengths from coil. The processor directly controls, or
is responsible for, the operations involved in the processing of
coils into finished plates. Such operations include decoiling,
leveling, cutting to length, testing, inspection, conditioning,
heat treatment (if applicable), packaging, marking, loading for
shipment, and certification.
NOTE 1—For plates produced from coil and furnished without heat
treatment or with stress relieving only, three test results are reported for
each qualifying coil. Additional requirements regarding plates from coil
are described in Specification A 20/A 20M.
3.6 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. Materials and Manufacture
4.1 Steelmaking Practice—The steel shall be killed and
shall conform to the fine grain size requirement of Specifica-
tion A 20/A 20M.
5. Heat Treatment
5.1 Plates 2 in. [50 mm] and under in thickness are normally
supplied in the as-rolled condition. Plates may be ordered
normalized or stress relieved, or both.
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 Sept. 10, 2003. Published October 2003. Originally
approved in 1947. Last previous edition approved in 1997 as A 302/A 302M – 97
e1
.
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For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
cation SA-302/SA-302M in Section II of that Code.
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Annual Book of ASTM Standards, Vol 01.04.
1
*A Summary of Changes section appears at the end of this standard.
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