ASTM A302/A302M-97e1
(Specification)Standard Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel
Standard Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel
SCOPE
1.1 This specification covers manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates intended particularly for welded boilers and other pressure vessels.
1.2 Material under this specification is 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 specification.
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Designation: A 302/A 302M – 97
Standard Specification for
Pressure Vessel Plates, Alloy Steel, Manganese-
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Molybdenum and Manganese-Molybdenum-Nickel
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.
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e NOTE—Editorial corrections were made to this standard in August 1999.
1. Scope 3. General Requirements and Ordering Information
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1.1 This specification covers manganese-molybdenum and 3.1 Material supplied to this material specification shall
manganese-molybdenum-nickel alloy steel plates intended par- conform to Specification A 20/A 20M. These requirements
ticularly for welded boilers and other pressure vessels. outline the testing and retesting methods and procedures,
1.2 Material under this specification is available in four permissible variations in dimensions, and mass, quality and
grades having different strength levels as follows: repair of defects, marking, loading, etc.
3.2 Specification A 20/A 20M also establishes the rules for
Grade Tensile Strength, ksi [MPa] Type
ordering information that should be complied with when
A 75–95 [515–655] Mn-Mo
purchasing material to this specification.
B 80–100 [550–690] Mn-Mo
3.3 In addition to the basic requirements of this specifica-
C 80–100 [550–690] Mn-Mo-Ni
D 80–100 [550–690] Mn-Mo-Ni
tion, certain supplementary requirements are available when
additional control, testing, or examination is required to meet
1.3 The maximum thickness of plates is limited only by the
end use requirements. These include:
capacity of the chemical composition to meet the specified
3.3.1 Vacuum treatment,
mechanical property requirements. The minimum thickness is
3.3.2 Additional or special tension testing,
limited to 0.25 in. [6.5 mm].
3.3.3 Impact testing, and
1.4 The values stated in either inch-pound units or SI units
3.3.4 Nondestructive examination.
are to be regarded separately as standard. Within the text, the
3.4 The purchaser is referred to the listed supplementary
SI units are shown in brackets. The values stated in each
requirements in this specification and to the detailed require-
system are not exact equivalents; therefore, each system must
ments in Specification A 20/A 20M.
be used independently of the other. Combining values from the
3.5 If the requirements of this specification are in conflict
two systems may result in nonconformance with the specifi-
with the requirements of Specification A 20/A 20M, the re-
cation.
quirements of this specification shall prevail.
2. Referenced Documents
4. Materials and Manufacture
2.1 ASTM Standards:
4.1 Steelmaking Practice—The steel shall be killed and
A 20/A20M Specification for General Requirements for
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shall conform to the fine grain size requirement of Specifica-
Steel Plates for Pressure Vessels
tion A 20/A 20M.
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5. Heat Treatment
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
5.1 Plates 2 in. [50 mm] and under in thickness are normally
A01.11 on Steel Plates for Boilers and Pressure Vessels.
supplied in the as-rolled condition. Plates may be ordered
Current edition approved March 10, 1997. Published November 1997. Originally
published as A 302 – 47 T. Last previous edition A 302/A 302M – 93. normalized or stress relieved, or both.
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For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
5.2 Plates over 2 in. [50 mm] in thickness shall be normal-
cation SA-302/SA-302M in Section II of that Code.
ized.
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Annual Book of ASTM Standards, Vol 01.04.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
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A 302/A 302M – 97
TABLE 1 Chemical Requirements
5.3 When normalizing plates 4 in. [100 mm] or over in
thickness, the cooling rate may be accelerated by air blasting or Composition, %
liquid quenching to obtain mechanical properties comparable
Elements Grade A Grade B Grade C Grade D
to those developed by normalizing plates in the lesser thick-
A
Carbon, max :
nesses. Up to 1 in. [25 mm], 0.20 0.20 0.20 0.20
incl, in thickness
5.4 If approved by the purchaser, for plates less than 4 in.
Over 1 to 2 in. [50 0.23 0.23 0.23 0.23
[100 mm] in thickness, cooling rates
...
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