ASTM A734/A734M-87a(2003)
(Specification)Standard Specification for Pressure Vessel Plates, Alloy Steel and High-Strength Low-Alloy Steel, Quenched-and-Tempered
Standard Specification for Pressure Vessel Plates, Alloy Steel and High-Strength Low-Alloy Steel, Quenched-and-Tempered
SCOPE
1.1 This specification covers quenched-and-tempered alloy steel and high-strength low-alloy steel plates for piping components and welded pressure vessels.
1.2 Two types are covered, which provide two different chemical compositions with the same tensile requirements. Both types are quenched-and-tempered to enhance mechanical properties.
1.2.1 Type A is an alloy steel intended for use at low ambient temperatures of -80°F [-60°C] and higher.
1.2.2 Type B is a high-strength low-alloy steel intended for use at ambient temperatures of -20°F [-30°C] and higher.
1.3 The maximum thickness of plates is limited only by the capacity of the chemical composition and heat treatment to meet the specified mechanical property requirements. Individual manufacturers should be consulted on thickness limitations since current industry limitations have not been ascertained to date.
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 734/A734M – 87a (Reapproved 2003)
Standard Specification for
Pressure Vessel Plates, Alloy Steel and High-Strength Low-
Alloy Steel, Quenched-and-Tempered
This standard is issued under the fixed designationA734/A734M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber 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 577/A577M Specification for Ultrasonic Angle-Beam
Examination of Steel Plates
1.1 This specification covers quenched-and-tempered alloy
A578/A578M Specification for Straight-Beam Ultrasonic
steel and high-strength low-alloy steel plates for piping com-
Examination of Plain and Clad Steel Plates for Special
ponents and welded pressure vessels.
Applications
1.2 Two types are covered, which provide two different
chemical compositions with the same tensile requirements.
3. Manufacture
Both types are quenched-and-tempered to enhance mechanical
3.1 Steelmaking Practice:
properties.
3.1.1 The steel shall be killed and shall conform to the fine
1.2.1 Type A is an alloy steel intended for use at low
austenitic grain size requirement of SpecificationA20/A20M.
ambient temperatures of −80°F [−60°C] and higher.
1.2.2 Type B is a high-strength low-alloy steel intended for
4. Heat Treatment
use at ambient temperatures of −20°F [−30°C] and higher.
4.1 The plates shall be heat treated by quenching and
1.3 The maximum thickness of plates is limited only by the
tempering. The austenitizing temperature shall be 1725°F
capacity of the chemical composition and heat treatment to
[940°C] maximum. Tempering temperature shall be 1150 to
meet the specified mechanical property requirements. Indi-
1300°F [620 to 705°C].
vidual manufacturers should be consulted on thickness limita-
4.2 If the purchaser elects to perform the heat treatment, the
tions since current industry limitations have not been ascer-
material shall be accepted on the basis of mill tests made from
tained to date.
testcouponsheattreatedinaccordancewiththepurchaseorder
1.4 The values stated in either inch-pound units or SI units
requirements. If the test coupon heat treatment is not indicated
are to be regarded separately as standard. Within the text, the
on the purchase order, the manufacturer shall heat treat the test
SI units are shown in brackets. The values stated in each
coupons under conditions he considers appropriate.The manu-
system are not exact equivalents; therefore, each system must
facturer shall inform the purchaser of the heat-treat procedure
beusedindependentlyoftheother.Combiningvaluesfromthe
followed in treatment of the test coupon.
two systems may result in nonconformance with the specifi-
cation.
5. General Requirements and Basis of Purchase
5.1 Material supplied to this material specification shall
2. Referenced Documents
conform to the requirements of Specification A20/A20M.
2.1 ASTM Standards:
These requirements outline the testing and retesting methods
A20/A20M Specification for General Requirements for
and procedures, permissible variations in dimensions and
Steel Plates for Pressure Vessels
weight, quality, repair of defects, marking, loading, etc.
A435/A435M Specification for Straight-Beam Ultrasonic
2 5.2 Specification A20/A20M also establishes the rules for
Examination of Steel Plates
compliance to the basis of purchase when purchasing material
to this specification.
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, 5.3 Certainsupplementaryrequirementsconsideredsuitable
Stainless Steel and RelatedAlloys, and is the direct responsibility of Subcommittee
for use with this specification are listed at the end of the
A01.11 on Steel for Boilers and Pressure Vessels.
specification. These include some of the standardized supple-
Current edition approved Sept. 10, 2003. Published September 2003. Originally
mentary requirements listed in Specification A20/A20M as
approved in 1976. Last previous edition approved in 1997 asA734/A734M–87
...
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