ASTM A724/A724M-99
(Specification)Standard Specification for Pressure Vessel Plates, Carbon-Manganese-Silicon Steel, Quenched and Tempered, for Welded Layered Pressure Vessels
Standard Specification for Pressure Vessel Plates, Carbon-Manganese-Silicon Steel, Quenched and Tempered, for Welded Layered Pressure Vessels
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1.1 This specification covers steel plates in three grades of carbon steel, designated Grades A, B, and C. At the option of the supplier, Grade C may be produced with a boron addition up to the maximum content specified in Section 6. The plates are quenched-and-tempered and are primarily intended for welded-layered pressure vessels.
1.2 Material under this specification is available in three grades as follows: Yield Strength, Tensile Strength, Grade min, ksi [MPa] ksi [MPa] A 70 [485] 90-110 [620-760] B 75 [515] 95-115 [655-795] C 70 [485] 90-110 [620-760]
1.3 The maximum thickness of plates supplied under this specification is limited only by the capability of the chemical composition to meet the specified mechanical requirements. However, current practice normally limits the maximum thickness to 7/8 in. [22 mm] for Grades A and B, and to 2 in. [50 mm] for Grade C.
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 724/A 724M – 99
Standard Specification for
Pressure Vessel Plates, Carbon-Manganese-Silicon Steel,
Quenched and Tempered, for Welded Layered Pressure
Vessels
This standard is issued under the fixed designation A 724/A 724M; 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 3.3 In addition to the basic requirements of this specifica-
tion, certain supplementary requirements are available when
1.1 This specification covers three grades of carbon-
additional control, testing, or examination is required to meet
manganese-silicon steel, designated Grades A, B, and C. Grade
end use requirements. These include:
C may be produced with a boron addition. The plates are
3.3.1 Vacuum treatment,
quenched and tempered and are intended for welded-layered
3.3.2 Additional or special tension testing,
pressure vessels.
3.3.3 Impact testing, and
1.2 The maximum thickness of plates supplied under this
3.3.4 Nondestructive examination.
specification is limited only by the capability of the chemical
3.4 The purchaser is referred to the listed supplementary
composition to meet the specified mechanical requirements.
requirements in this specification and to the detailed require-
However, current practice normally limits the maximum thick-
7 ments in Specification A 20/A 20M.
ness to ⁄8 in. [22 mm] for Grades A and B, and to 2 in. [50 mm]
3.5 If the requirements of this specification are in conflict
for Grade C.
with the requirements of Specification A 20/A 20M, the re-
1.3 The values stated in either inch-pound units or SI units
quirements of this specification shall prevail.
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
4. Manufacture
system are not exact equivalents; therefore, each system must
4.1 Steelmaking Process—The steel shall be killed and shall
be used independently of the other. Combining values from the
conform to the fine austenitic grain size requirement of
two systems may result in nonconformance with the specifi-
Specification A 20/A 20M.
cation.
5. Heat Treatment
2. Referenced Documents
5.1 All plates shall be quenched from a temperature in the
2.1 ASTM Standards:
range from 1600 to 1700°F [870 to 925°C]. Grades A and B
A 20/A 20M Specification for General Requirements for
3 shall then be tempered at not less than 1100°F [595°C], and
Steel Plates for Pressure Vessels
Grade C shall then be tempered at not less than 1150°F
3. General Requirements and Ordering Information [620°C]. The tempering soaking time shall be not less than ⁄2
h.
3.1 Material supplied to this material specification shall
conform to Specification A 20/A 20M. These requirements
TABLE 1 Chemical Requirements
outline the testing and retesting methods and procedures,
permissible variations in dimensions and weight, quality and
Composition, %
Element
repair of defects, marking, loading, etc.
Grade A Grade B Grade C
3.2 Specification A 20/A 20M also establishes the rules for
Carbon, max:
the ordering information that should be complied with when
Heat analysis 0.18 0.20 0.22
purchasing material to this specification.
Product analysis 0.22 0.24 0.26
Manganese:
Heat analysis 1.00–1.60 1.00–1.60 1.10–1.60
Product analysis 0.92–1.72 0.92–1.72 1.02–1.72
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
A
Phosphorus, max 0.035 0.035 0.035
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A
Sulfur, max 0.035 0.035 0.035
A01.11 on Steel Plates for Boilers and Pressure Vessels.
Silicon, max:
Current edition approved March 10, 1999. Published June 1999. Originally
Heat analysis 0.55 0.50 0.
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