ASTM A542/A542M-99
(Specification)Standard Specification for Pressure Vessel Plates, Alloy Steel, Quenched-and-Tempered, Chromium-Molybdenum, and Chromium-Molybdenum-Vanadium
Standard Specification for Pressure Vessel Plates, Alloy Steel, Quenched-and-Tempered, Chromium-Molybdenum, and Chromium-Molybdenum-Vanadium
SCOPE
1.1 This specification covers two types of 21/4 Cr-1 Mo and three types of Cr-Mo-V alloy steel plates for use in the quenched-and-tempered condition, intended for the fabrication of welded pressure vessels and components.
1.2 Material under this specification is available in five types, designated "A," "B," "C,"" D," and "E." Type B is identical to Type A except for restrictive limits for carbon, phosphorus, sulfur, and nickel. The material is also available in five classes having the following strength levels. Type E is available only as Class 4 and 4a. ClassMinimum Tensile Strength, ksi [MPa] 1 105 [725] 2 115 [795] 3 95 [655] 4 and 4a 85 [585]
1.3 The maximum thickness of plates is limited only by the capacity of the chemical composition to meet the specified mechanical property requirements.
1.4 The minimum thickness of plates is limited to 3/16 in. [5 mm].
1.5 The material is intended to be suitable for fusion welding. Welding technique is of fundamental importance and it is presupposed that welding procedures will be in accordance with approved methods.
1.6 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 542/A 542M – 99
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Pressure Vessel Plates, Alloy Steel, Quenched-and-
Tempered, Chromium-Molybdenum, and Chromium-
Molybdenum-Vanadium
This standard is issued under the fixed designation A 542/A 542M; 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 A 20/A 20M Specification for General Requirements for
1 Steel Plates for Pressure Vessels
1.1 This specification covers two types of 2 ⁄4 Cr-1 Mo and
A 370 Test Methods and Definitions for Mechanical Testing
three types of Cr-Mo-V alloy steel plates for use in the
of Steel Products
quenched-and-tempered condition, intended for the fabrication
A 435/A 435M Specification for Straight-Beam Ultrasonic
of welded pressure vessels and components.
Examination of Steel Plates
1.2 Material under this specification is available in five
A 577/A 577M Specification for Ultrasonic Angle-Beam
types, designated “A,” “B,” “C,”“ D,” and “E.” Type B is
Examination of Steel Plates
identical to Type A except for restrictive limits for carbon,
A 578/A 578M Specification for Straight-Beam Ultrasonic
phosphorus, sulfur, and nickel. The material is also available in
Examination of Plain and Clad Steel Plates for Special
five classes having the following strength levels. Type E is
Applications
available only as Class 4 and 4a.
Class Minimum Tensile Strength, ksi [MPa]
3. General Requirements and Ordering Information
1 105 [725]
3.1 Material supplied to this material specification shall
2 115 [795]
conform to Specification A 20/A 20M. These requirements
3 95 [655]
outline the testing and retesting methods and procedures,
4 and 4a 85 [585]
permissible variations in dimensions, and mass, quality and
1.3 The maximum thickness of plates is limited only by the
repair of defects, marking, loading, etc.
capacity of the chemical composition to meet the specified
3.2 Specification A 20/A 20M also establishes the rules for
mechanical property requirements.
the ordering information which should be complied with when
1.4 The minimum thickness of plates is limited to ⁄16 in. [5
purchasing material to this specification.
mm].
3.3 In addition to the basic requirements of this specifica-
1.5 The material is intended to be suitable for fusion
tion, certain supplementary requirements are available when
welding. Welding technique is of fundamental importance and
additional control, testing, or examination is required to meet
it is presupposed that welding procedures will be in accordance
end use requirements. These include:
with approved methods.
3.3.1 Vacuum treatment,
1.6 The values stated in either inch-pound units or SI units
3.3.2 Additional or special tension testing,
are to be regarded separately as standard. Within the text, the
3.3.3 Impact testing, and
SI units are shown in brackets. The values stated in each
3.3.4 Nondestructive examination.
system are not exact equivalents, therefore, each system must
3.4 The purchaser is referred to the supplementary require-
be used independently of the other. Combining values from the
ments listed in this specification and to the detailed require-
two systems may result in nonconformance with this specifi-
ments in Specification A 20/A 20M.
cation.
3.5 If the requirements of this specification are in conflict
with the requirements of Specification A 20/A 20M, the re-
2. Referenced Documents
quirements of this specification shall prevail.
2.1 ASTM Standards:
4. Manufacture
4.1 Steelmaking Practice—The steel shall be killed and
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
shall conform to the fine austenitic grain size requirement of
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
Specification A 20/A 20M.
A01.11 on Steel Plates for Boiler and Pressure Vessels.
Current edition approved March 10, 1999. Published June 1999. Originally
e1
published as A 542 – 65. Last previous edition A 542/A 542M – 95 .
2 3
For ASME Boiler and Pressure Vessel Code applications, see related Specifi- Annual Book of ASTM Standards, Vol 01.04.
cation SA-542 in Section II of that Code. Annual Book of ASTM Standards, Vol 01.01.
A 542/A 542M
5.3 Plates over 4 in. [100 mm] in thickness shall receive a
prior heat treatment of normalizing at, or water quenching
from, a temperature within the range from 1650 to 1850°F [900
to 1010°C] for Types A, B, C, and D and 1850 to 2050°F [1010
to 1120°C] for Type E before the heat treatment specified in
5.1.
5.4 When the purchaser elects to perform the heat treatment
required above, the material manufacturer shall temper the
plates prior to shipment at a temperature not lower than 1050°F
[565°C] for Types A, B, C, and D and not lower than 1200°F
[650°C] for Type E.
6. Chemical Composition
6.1 The steel shall conform to the chemical requirements
shown in Table 1.
FIG. 1 Transition Temperature Curves Before and After Step Cool
Heat Treatment 7. Mechanical Properties
7.1 Tension Test Requirements:
5. Heat Treatment 7.1.1 The material as represented by the tension-test speci-
mens shall conform to the requirements shown in Table 2.
5.1 All plates shall be heat treated by heating to a suitable
7.1.2 For nominal plate thicknesses of ⁄4 in. [20 mm] and
austenitizing temperature, holding for a sufficient period of
under, the 1 ⁄2-in. [40-mm] wide rectangular specimen may be
time to attain uniform temperature throughout the thickness,
used for the tension test, and the elongation may be determined
and quenching in a suitable liquid medium by spraying or
in a 2-in. [50-mm] gage length that includes the fracture and
immersion. For Type D material, the minimum austenitizing
that shows the greatest elongation.
temperature shall be 1650°F [900°C]. For Type E material, the
minimum austenitizing temperature shall be 1850°F [1010°C]. 7.2 Notch Toughness Requirements—Classes 4 and 4a:
5.2 After quenching, the plates shall be tempered to produce
7.2.1 A transverse Charpy V-notch test from each plate-as-
the specified tensile requirements by heating to a suitable
heat-treated shall have a minimum energy absorption value of
temperature and holding for a period of time of not less that 30
40 ft·lbf [54 J] average of three specimens and 35 ft·lbf [48 J]
min/in. [1.2 min/mm] of thickness but not less than ⁄2 h. The
for one specimen only in the set.
minimum tempering temperature shall be as follows:
7.2.2 For Class 4, the impact test temperature shall be as
Type Class Temperature, °F [°C]
specified on the order.
7.2.3 For Class 4a, the impact test temperature shall be 0°F
A, B, C 1, 2, 3 1050 [565]
A, B, C 4 1200 [650] [−18°C].
A, B, C, D 4a 1250 [675]
A 542/A 542M
TABLE 1 Chemical Requirements
Composition, %
Element
Type A Type B Type C Type D Type E
Carbon:
Heat analysis 0.15 max 0.11–0.15 0
...
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