ASTM A841/A841M-03
(Specification)Standard Specification for Steel Plates for Pressure Vessels, Produced by Thermo-Mechanical Control Process (TMCP)
Standard Specification for Steel Plates for Pressure Vessels, Produced by Thermo-Mechanical Control Process (TMCP)
SCOPE
1.1 This specification covers steel plates produced by the thermo-mechanical control process (TMCP). The plates are intended primarily for use in welded pressure vessels.
1.2 The TMCP method consists of rolling-reduction and cooling rate controls which result in mechanical properties in the finished plate that are equivalent to those attained using conventional rolling and heat treating processes which entail reheating after rolling. A description of the TMCP method is given in Appendix X1.
1.3 Due to the inherent characteristics of the TMCP method, the plates cannot be formed at elevated temperatures without sustaining significant losses in strength and toughness. The plates may be formed and post-weld heat-treated at temperatures not exceeding 1200oF [650oC], providing the requirements of 6.1 are met.
1.4 The maximum nominal thickness of plates furnished under this specification may not exceed 4 in. [100 mm].
1.5 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 841/A 841M – 03
Standard Specification for
Steel Plates for Pressure Vessels, Produced by Thermo-
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Mechanical Control Process (TMCP)
This standard is issued under the fixed designation A 841/A 841M; 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
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2
Steel Plates for Pressure Vessels
1.1 This specification covers steel plates produced by the
A 435/A 435M Specification for Straight-Beam Ultrasonic
thermo-mechanical control process (TMCP). The plates are
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Examination of Steel Plates
intended primarily for use in welded pressure vessels.
A 577/A 577M Specification for Ultrasonic Angle-Beam
1.2 The TMCP method consists of rolling-reduction and
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Examination of Steel Plates
cooling rate controls that result in mechanical properties in the
A 578/A 578M Specification for Straight-Beam Ultrasonic
finished plate that are equivalent to those attained using
Examination of Plain and Clad Steel Plates for Special
conventional rolling and heat treating processes, which entail
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Applications
reheating after rolling. A description of the TMCP method is
given in Appendix X1.
3. General Requirements and Ordering Information
1.3 Due to the inherent characteristics of the TMCP method,
3.1 Plates supplied to this product specification shall con-
the plates cannot be formed at elevated temperatures without
form to Specification A 20/A 20M, which outlines the testing
sustaining significant losses in strength and toughness. The
and retesting methods and procedures, permissible variations
plates may be formed and post-weld heat-treated at tempera-
in dimensions, quality and repair of defects, marking, loading,
tures not exceeding 1200°F [650°C], providing the require-
etc.
ments of 6.1 are met.
3.2 Specification A 20/A 20M also establishes the rules for
1.4 The maximum permitted nominal thickness of plates
ordering information that should be complied with when
furnished to this specification is 4 in. [100 mm] for Grades A,
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purchasing plates to this specification.
B, and C; and 1.5 in. [40 mm] for Grades D ,E,and F.
3.2.1 If the plates are to be subjected to warm forming or
1.5 The values stated in either inch-pound units or SI units
post-weld heat treatment, the order must indicate the tempera-
are to be regarded separately as standard. Within the text, the
tures and times-at-temperature that will be utilized in such
SI units are shown in brackets. The values stated in each
operations. (See 6.1 and Specification A 20/A 20M, Supple-
system are not exact equivalents. Therefore, each system must
mentary Requirement S3.)
be used independently of the other. Combining values from the
3.3 In addition to the basic requirements of this specifica-
two systems may result in nonconformance with this specifi-
tion, certain supplementary requirements are available when
cation.
additional control, testing, or examination is required to meet
2. Referenced Documents end use requirements. These include:
3.3.1 Vacuum treatment,
2.1 ASTM Standards:
3.3.2 Additional or special tension testing,
3.3.3 Additional or special impact testing, and
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
3.3.4 Nondestructive examination.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
3.4 The purchaser is referred to the listed supplementary
A01.11 on Steel Plates for Boilers and Pressure Vessels.
Current edition approved April 10, 2003. Published June 2003. Originally requirements in this specification and to the detailed require-
approved in 1985. Last previous edition approved in 2001 as A 841/A 841M – 01.
ments in Specification A 20/A 20M.
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For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
3.5 If the requirements of this specification are in conflict
cation SA-841/SA-841M in Section II of that Code.
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with the requirements of Specification A 20/A 20M, the re-
ExxonMobil Upstream Research Company has patents pending concerning the
use of chemistry ranges in ASTM A 841 Grade D, in combination with specific
quirements of this specification shall prevail.
TMCP routes and/or specific microstructural features. Interested parties are invited
to submit information regarding identification of alternatives to these patented items
to ASTM International Headquarters. Your comments will receive careful consid-
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eration at a meeting of the responsible technical committee, which you may attend. Annual Book of ASTM Standards, Vol 01.04.
*A Summary of Changes section appears at the end of this standard.
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