ASTM A738/A738M-12a
(Specification)Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel, for Moderate and Lower Temperature Service
Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel, for Moderate and Lower Temperature Service
ABSTRACT
This specification covers heat-treated carbon-manganese-silicon steel plates intended for use in welded pressure vessels at moderate and lower temperature service. The materials are available in four strength levels and five grades, namely Grades A, B, C, D, and E. 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. The steel shall be killed and the plates shall be subjected to heat treatment, quenching, and tempering. The plates shall undergo a tension test to determine mechanical properties such as tensile strength, yield strength and elongation.
SCOPE
1.1 This specification2 covers heat-treated carbon-manganese-silicon steel plates intended for use in welded pressure vessels at moderate and lower temperature service.
1.2 Material under this specification is available in four strength levels, 75 ksi [515 MPa], 85 ksi [585 MPa], 80 ksi [550 MPa], and 90 ksi [620 MPa] minimum ultimate tensile strengths.
1.3 The maximum thickness of plates for Grades A, B, and C is limited only by the capacity of the chemical composition and heat treatment to meet the specified mechanical property requirements; however, current practice normally limits the maximum thickness of plates furnished under this specification to 6 in. [ 150 mm] for Grade A, 4 in. [100 mm] for Grade B, and 6 in. [150 mm] for Grade C. The maximum permitted nominal thickness is 1.5 in. [40 mm] for Grade D and 2 in. [50 mm] for Grade E.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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Designation: A738/A738M −12a
Standard Specification for
Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-
1
Silicon Steel, for Moderate and Lower Temperature Service
This standard is issued under the fixed designationA738/A738M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 3. General Requirements and Ordering Information
2
3.1 Material supplied to this material specification shall
1.1 This specification covers heat-treated carbon-
conform to Specification A20/A20M. These requirements out-
manganese-silicon steel plates intended for use in welded
line the testing and retesting methods and procedures, permit-
pressure vessels at moderate and lower temperature service.
ted variations in dimensions, and mass, quality and repair of
1.2 Material under this specification is available in four
defects, marking, loading, and ordering information.
strength levels, 75 ksi [515 MPa], 85 ksi [585 MPa], 80 ksi
3.2 In addition to the basic requirements of this
[550 MPa], and 90 ksi [620 MPa] minimum ultimate tensile
specification,certainsupplementaryrequirementsareavailable
strengths.
when additional control, testing, or examination is required to
1.3 The maximum thickness of plates for GradesA, B, and meet end use requirements. The purchaser is referred to the
listed supplementary requirements in this specification and to
C is limited only by the capacity of the chemical composition
and heat treatment to meet the specified mechanical property the detailed requirements in Specification A20/A20M.
requirements; however, current practice normally limits the
3.3 If the requirements of this specification are in conflict
maximumthicknessofplatesfurnishedunderthisspecification
withtherequirementsofSpecificationA20/A20M,therequire-
to 6 in. [ 150 mm] for Grade A, 4 in. [100 mm] for Grade B,
ments of this specification shall prevail.
and 6 in. [150 mm] for Grade C. The maximum permitted
4. Manufacture
nominal thickness is 1.5 in. [40 mm] for Grade D and 2 in. [50
mm] for Grade E. 4.1 Steelmaking Practice—The steel shall be killed and
shall conform to the fine austenitic grain size requirement of
1.4 The values stated in either SI units or inch-pound units
Specification A20/A20M.
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each 5. Heat Treatment
system shall be used independently of the other. Combining
5.1 Grade A plates 2.5 in. [65 mm] and under in thickness
values from the two systems may result in non-conformance
shall be supplied in the normalized condition or in the
with the standard.
quenched and tempered condition at the option of the manu-
facturer.
2. Referenced Documents
5.2 Grade A plates over 2.5 in. [65 mm] in thickness and
3
2.1 ASTM Standards:
Grade B, Grade C, Grade D, and Grade E plates in all
A20/A20MSpecificationforGeneralRequirementsforSteel thicknesses shall be quenched-and-tempered.
Plates for Pressure Vessels
5.3 When plates are tempered, the minimum tempering
temperature shall be 1100°F [595°C].
6. Chemical Requirements
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee 6.1 The steel shall conform to the chemical requirements
A01.11 on Steel Plates for Boilers and Pressure Vessels.
showninTable1unlessotherwisemodifiedinaccordancewith
Current edition approved Nov. 1, 2012. Published January 2013. Originally
Supplementary Requirement S 17, Vacuum Carbon-
approved in 1976. Last previous edition approved in 2012 as A738/A738M–12.
Deoxidized Steel in Specification A20/A20M.
DOI: 10.1520/A0738_A0738M-12A.
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
7. Mechanical Requirements
cation SA-738/SA-738M in Section II of that Code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.1 Tension Test Requirements—The plates as represented
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
bythetensiontestspecimensshallconformtotherequirements
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. of Table 2.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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A738/A738M − 12a
TABLE 1 Chemical Requirements
Composition, %
Element
Grade A Grade B Grade C Grade D Grade E
A B
Carbon, max 0.24 0.20 0.20 0.10 0.12
Manganese:
Heat analysis
B
...
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: A738/A738M − 12 A738/A738M − 12a
Standard Specification for
Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-
1
Silicon Steel, for Moderate and Lower Temperature Service
This standard is issued under the fixed designation A738/A738M; 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 heat-treated carbon-manganese-silicon steel plates intended for use in welded pressure vessels at
moderate and lower temperature service.
1.2 Material under this specification is available in four strength levels, 75 ksi [515 MPa], 85 ksi [585 MPa], 80 ksi [550 MPa],
and 90 ksi [620 MPa] minimum ultimate tensile strengths.
1.3 The maximum thickness of plates for Grades A, B, and C is limited only by the capacity of the chemical composition and
heat treatment to meet the specified mechanical property requirements; however, current practice normally limits the maximum
thickness of plates furnished under this specification to 6 in. [ 150 mm] for Grade A, 4 in. [100 mm] for Grade B, and 6 in. [150
mm] for Grade C. For Grades D and E, the The maximum permitted nominal thickness is 1.5 in. [40 mm].mm] for Grade D and
2 in. [50 mm] for Grade E.
1.4 Grade A is the material that, prior to 1984, was covered by Specification A738 without a grade designation.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
2. Referenced Documents
3
2.1 ASTM Standards:
A20/A20M Specification for General Requirements for Steel Plates for Pressure Vessels
3. General Requirements and Ordering Information
3.1 Material supplied to this material specification shall conform to Specification A20/A20M. These requirements outline the
testing and retesting methods and procedures, permitted variations in dimensions, and mass, quality and repair of defects, marking,
loading, and ordering information.
3.2 In addition to the basic requirements of this specification, certain supplementary requirements are available when additional
control, testing, or examination is required to meet end use requirements. The purchaser is referred to the listed supplementary
requirements in this specification and to the detailed requirements in Specification A20/A20M.
3.3 If the requirements of this specification are in conflict with the requirements of Specification A20/A20M, the requirements
of this specification shall prevail.
4. Manufacture
4.1 Steelmaking Practice—The steel shall be killed and shall conform to the fine austenitic grain size requirement of
Specification A20/A20M.
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 May 1, 2012Nov. 1, 2012. Published June 2012January 2013. Originally approved in 1976. Last previous edition approved in 20072012 as
A738/A738M – 07.A738/A738M – 12. DOI: 10.1520/A0738_A0738M-12.10.1520/A0738_A0738M-12A.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-738/SA-738M in Section II of that Code.
3
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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A738/A738M − 12a
5. Heat Treatment
5.1 Grade A plates 2.5 in. [65 mm] and under in thickness shall be supplied in either the normalized condition or in the quenched
and tempered condition. condition at the option of the manufacturer.
5.2 Grade A plates over 2.5 in. [65 mm] in thickness and Grade B, Grade C, Grade D, and Grade E plates in all thicknesses
shall be quenched-and-tempered.
5.3 When plates are tempered, the minimum tempering temperature shall be 1100°F [595
...
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