ASTM A841/A841M-17
(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)
ABSTRACT
This specification covers steel plates produced by the thermo-mechanical control process (TMCP). The plates are intended primarily for use in welded pressure vessels. The steel shall be killed and shall conform to specified fine austenitic grain size and chemical composition requirements. If the plates are to be subjected to warm forming or post-weld heat treatment, the test coupons shall be subjected to heat treatment to simulate such fabrication operations. The tension test and notch toughness test requirements are presented in details. Two tension tests shall be made from each plate-as-rolled. One test coupon shall be taken from a corner of the plate on each end.
SCOPE
1.1 This specification2 covers steel plates produced by the thermo-mechanical control process (TMCP). The plates are intended primarily for use in welded pressure vessels. A description of the TMCP method is given in Appendix X1.
1.2 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. Except for Grade G, the plates may be formed and post-weld heat-treated at temperatures not exceeding 1200°F [650°C], providing the requirements of 6.1 are met. Grade G plates may be formed at temperatures not exceeding 985°F [530°C] provided the requirements of 6.1 are met.
1.3 The maximum permitted nominal thickness of plates furnished to this specification is 4 in. [100 mm] for Grades A, B, and C; 1.5 in. [40 mm] for Grades D,3 E, and F; and 2 in. [50 mm] for Grade G.
1.4 Grade G is susceptible to magnetization. Use of magnets in handling after heat treatment should be avoided if residual magnetism would be detrimental to subsequent fabrication or service.
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.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A841/A841M −17
Standard Specification for
Steel Plates for Pressure Vessels, Produced by Thermo-
1
Mechanical Control Process (TMCP)
This standard is issued under the fixed designationA841/A841M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 1.6 This international standard was developed in accor-
2 dance with internationally recognized principles on standard-
1.1 This specification covers steel plates produced by the
ization established in the Decision on Principles for the
thermo-mechanical control process (TMCP). The plates are
Development of International Standards, Guides and Recom-
intended primarily for use in welded pressure vessels. A
mendations issued by the World Trade Organization Technical
description of the TMCP method is given in Appendix X1.
Barriers to Trade (TBT) Committee.
1.2 DuetotheinherentcharacteristicsoftheTMCPmethod,
the plates cannot be formed at elevated temperatures without
2. Referenced Documents
sustaining significant losses in strength and toughness. Except
4
2.1 ASTM Standards:
for Grade G, the plates may be formed and post-weld heat-
A20/A20M SpecificationforGeneralRequirementsforSteel
treated at temperatures not exceeding 1200°F [650°C], provid-
Plates for Pressure Vessels
ing the requirements of 6.1 are met. Grade G plates may be
A435/A435M Specification for Straight-Beam Ultrasonic
formed at temperatures not exceeding 985°F [530°C] provided
Examination of Steel Plates
the requirements of 6.1 are met.
A577/A577M Specification for Ultrasonic Angle-Beam Ex-
1.3 The maximum permitted nominal thickness of plates
amination of Steel Plates
furnished to this specification is 4 in. [100 mm] for Grades A,
A578/A578M Specification for Straight-Beam Ultrasonic
3
B, and C; 1.5 in. [40 mm] for Grades D, E, and F; and 2 in.
Examination of Rolled Steel Plates for Special Applica-
[50 mm] for Grade G.
tions
1.4 GradeGissusceptibletomagnetization.Useofmagnets
3. General Requirements and Ordering Information
in handling after heat treatment should be avoided if residual
3.1 Plates supplied to this product specification shall con-
magnetism would be detrimental to subsequent fabrication or
form to Specification A20/A20M, which outlines the testing
service.
and retesting methods and procedures, permissible variations
1.5 The values stated in either inch-pound units or SI units
in dimensions, quality and repair of defects, marking, loading,
are to be regarded separately as standard. Within the text, the
etc.
SI units are shown in brackets. The values stated in each
3.2 Specification A20/A20M also establishes the rules for
system are not exact equivalents. Therefore, each system must
ordering information that should be complied with when
be used independently of the other. Combining values from the
purchasing plates to this specification.
two systems may result in nonconformance with this specifi-
3.2.1 If the plates are to be subjected to warm forming or
cation.
post-weld heat treatment, the order must indicate the tempera-
tures and times-at-temperature that will be utilized in such
1
operations.(See6.1andSpecificationA20/A20M,Supplemen-
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
tary Requirement S3.)
A01.11 on Steel Plates for Boilers and Pressure Vessels.
3.3 In addition to the basic requirements of this
Current edition approved Nov. 1, 2017. Published November 2017. Originally
approved in 1985. Last previous edition approved in 2013 as A841/A841M – 13.
specification, certain supplementary requirements are available
DOI: 10.1520/A0841_A0841M-17.
when additional control, testing, or examination is required to
2
For ASME Boiler and Pressure Vessel Code applications, see related Specifi-
meet end use requirements. These include:
cation SA-841/SA-841M in Section II of that Code.
3
ExxonMobil Upstream Research Company has patents pending concerning the
use of chemistry ranges in ASTM A841 Grade D, in combination with specific
4
TMCP routes and/or specific microstructural features. Interested parties are invited For referenced ASTM standards, visit the ASTM website, www.astm.org, or
to submit information regarding identification of alternatives to these patented items contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
to ASTM International Headquarters. Your comments will receive careful c
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A841/A841M − 13 A841/A841M − 17
Standard Specification for
Steel Plates for Pressure Vessels, Produced by Thermo-
1
Mechanical Control Process (TMCP)
This standard is issued under the fixed designation A841/A841M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
2
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. A description of the TMCP method is given in Appendix X1.
1.2 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. Except for Grade G, the plates may be formed and post-weld heat-treated
at temperatures not exceeding 1200°F [650°C], providing the requirements of 6.1 are met. Grade G plates may be formed at
temperatures not exceeding 985°F [530°C] provided the requirements of 6.1 are met.
1.3 The maximum permitted nominal thickness of plates furnished to this specification is 4 in. [100 mm] for Grades A, B, and
3
C; 1.5 in. [40 mm] for Grades D, E, and F; and 2 in. [50 mm] for Grade G.
1.4 Grade G is susceptible to magnetization. Use of magnets in handling after heat treatment should be avoided if residual
magnetism would be detrimental to subsequent fabrication or service.
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.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
4
2.1 ASTM Standards:
A20/A20M Specification for General Requirements for Steel Plates for Pressure Vessels
A435/A435M Specification for Straight-Beam Ultrasonic Examination of Steel Plates
A577/A577M Specification for Ultrasonic Angle-Beam Examination of Steel Plates
A578/A578M Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications
3. General Requirements and Ordering Information
3.1 Plates supplied to this product specification shall conform to Specification A20/A20M, which outlines the testing and
retesting methods and procedures, permissible variations in dimensions, quality and repair of defects, marking, loading, etc.
3.2 Specification A20/A20M also establishes the rules for ordering information that should be complied with when purchasing
plates to this specification.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.11
on Steel Plates for Boilers and Pressure Vessels.
Current edition approved Oct. 1, 2013Nov. 1, 2017. Published November 2013November 2017. Originally approved in 1985. Last previous edition approved in 20072013
as A841/A841M – 03a (2007).A841/A841M – 13. DOI: 10.1520/A0841_A0841M-13. 10.1520/A0841_A0841M-17.
2
For ASME Boiler and Pressure Vessel Code applications, see related Specification SA-841/SA-841M in Section II of that Code.
3
ExxonMobil Upstream Research Company has patents pending concerning the use of chemistry ranges in ASTM A841 Grade D, in combination with specific TMCP
routes and/or specific microstructural features. Interested parties are invited to submit information regarding identification of alternatives to these patented items to ASTM
1
International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
4
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
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