ASTM A533/A533M-24
(Specification)Standard Specification for Pressure Vessel Plates, Alloy Steel, Quenched and Tempered, Manganese-Molybdenum and Manganese-Molybdenum-Nickel
Standard Specification for Pressure Vessel Plates, Alloy Steel, Quenched and Tempered, Manganese-Molybdenum and Manganese-Molybdenum-Nickel
ABSTRACT
This specification covers manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates for use in welded pressure vessels. The steel materials shall be killed and shall conform to the required values of fine austenitic grain and shall also be heat treated. The steel specimens shall undergo heat analysis and product analysis and shall conform to the chemical requirements for carbon, manganese, phosphorus, sulfur, silicon, molybdenum, and nickel. Tension tests shall be performed wherein the steel specimens shall conform to the required values of tensile strength, yield strength, and elongation.
SCOPE
1.1 This specification2 covers one type of manganese-molybdenum and four types of manganese-molybdenum-nickel alloy steel plates for use in the quenched and tempered condition for the construction of welded pressure vessels.
1.2 Material under this specification is available in five types, designated “A,” “B,” “C,” “D,” and “E.” The material is also available in three classes having the following strength levels.
Class
Tensile Strength,
ksi [MPa]
1
80 to 100 [550 to 690]
2
90 to 115 [620 to 795]
3
100 to 125 [690 to 860]
1.3 The maximum thickness of Class 1 and Class 2 plates is limited only by the capacity of the composition to meet the specified mechanical property requirements; however, current practice normally limits the maximum thickness to 12 in. [300 mm] for Types A through D and to 7 in. [180 mm] for Type E.
1.4 The maximum thickness of Class 3 plates is 21/2 in. [65 mm] for Types A through D and 2 in. [50 mm] for Type E.
1.5 The minimum nominal thickness of plates of all classes is 0.25 in. [6.5 mm].
1.6 These alloy steel plates in the as-rolled condition are sensitive to cracking during transit and handling, particularly in thicknesses over 1 in. [25 mm]. They should be shipped in the as-rolled conditions only by mutual agreement of manufacturer and the purchaser.
1.7 Plates covered by this specification are often used in the beltline region of nuclear reactor vessels where the material properties may be affected by high levels of radiation. Appendix X1 provides some information pertinent to this usage.
1.8 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.
1.9 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.
General Information
- Status
- Published
- Publication Date
- 29-Feb-2024
- Technical Committee
- A01 - Steel, Stainless Steel and Related Alloys
- Drafting Committee
- A01.11 - Steel Plates for Boilers and Pressure Vessels
Relations
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Mar-2024
Overview
ASTM A533/A533M-24 is the globally accepted standard specification for pressure vessel plates made from quenched and tempered manganese-molybdenum and manganese-molybdenum-nickel alloy steels. Issued by ASTM International, this standard provides the essential requirements for chemical composition, mechanical properties, heat treatment, and testing protocols for alloy steel plates used in welded pressure vessels. These plates are vital for safety-critical applications, such as the beltline regions of nuclear reactor vessels, where strength, reliability, and resistance to radiation-induced property changes are paramount.
Key Topics
Alloy Types and Classes:
The standard covers one type of manganese-molybdenum and four types of manganese-molybdenum-nickel alloy steels. Materials are available in five types (A, B, C, D, E) and three strength classes:- Class 1: 80-100 ksi [550-690 MPa]
- Class 2: 90-115 ksi [620-795 MPa]
- Class 3: 100-125 ksi [690-860 MPa]
Thickness Specifications:
Plate thickness for Classes 1 and 2 is typically limited to 12 in. [300 mm] for Types A-D and 7 in. [180 mm] for Type E. Class 3 plates are limited to 2.5 in. [65 mm] for Types A-D and 2 in. [50 mm] for Type E. The minimum thickness for all classes is 0.25 in. [6.5 mm].Heat Treatment and Mechanical Requirements:
All plates must be heat treated by quenching and tempering, achieving specified tensile and yield strengths, as well as elongation properties. Heat analysis and product analysis ensure compliance with limits for carbon, manganese, phosphorus, sulfur, silicon, molybdenum, and nickel.Testing and Supplementary Requirements:
Standardized tests include tensile testing, ultrasonic testing, Charpy V-notch impact tests, drop weight tests, and others. The plates must be “killed” steel with fine austenitic grain structure, and additional requirements such as vacuum treatment or high-temperature tension tests may be specified as needed.Unit Systems:
Both inch-pound and SI units are recognized, but each should be used independently to maintain compliance.
Applications
Welded Pressure Vessels:
These alloy steel plates are specially developed for welded pressure vessels in industries requiring high performance and safety margins.Nuclear Reactor Vessels:
Frequently used in the beltline region of nuclear reactor vessels, where material properties are critical under high radiation exposure.High-Pressure Industrial Equipment:
Suitable for boilers, chemical reactors, and other vessels operating under severe service conditions where mechanical integrity over long-term use is vital.Heavy-Duty Engineering:
The robustness and toughness standards make these plates ideal for heavy fabrication, where thick-section properties, resistance to fracture, and consistency are necessary.
Related Standards
For broader compliance and integration, the following ASTM and ASME standards are often used alongside ASTM A533/A533M-24:
- ASTM A20/A20M: General requirements for steel plates for pressure vessels.
- ASTM A435/A435M: Straight-beam ultrasonic testing of steel plates.
- ASTM A578/A578M, A577/A577M: Ultrasonic testing methods for special applications.
- ASME SA-533/SA-533M: Equivalent specification for boiler and pressure vessel codes.
- Referenced Volumes in the ASME Boiler and Pressure Vessel Code: Section II.
Practical Value
By specifying rigorous requirements for chemical composition, mechanical performance, and quality assurance, ASTM A533/A533M-24 ensures the safety, durability, and reliability of alloy steel plates in critical pressure vessel applications. Industries relying on this standard benefit from enhanced risk management, regulatory compliance, and consistent performance in demanding operating environments.
Keywords: ASTM A533/A533M, pressure vessel plates, alloy steel, manganese-molybdenum, manganese-molybdenum-nickel, quenched and tempered, welded pressure vessels, nuclear reactor vessel steel, mechanical properties, standard specification.
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Frequently Asked Questions
ASTM A533/A533M-24 is a technical specification published by ASTM International. Its full title is "Standard Specification for Pressure Vessel Plates, Alloy Steel, Quenched and Tempered, Manganese-Molybdenum and Manganese-Molybdenum-Nickel". This standard covers: ABSTRACT This specification covers manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates for use in welded pressure vessels. The steel materials shall be killed and shall conform to the required values of fine austenitic grain and shall also be heat treated. The steel specimens shall undergo heat analysis and product analysis and shall conform to the chemical requirements for carbon, manganese, phosphorus, sulfur, silicon, molybdenum, and nickel. Tension tests shall be performed wherein the steel specimens shall conform to the required values of tensile strength, yield strength, and elongation. SCOPE 1.1 This specification2 covers one type of manganese-molybdenum and four types of manganese-molybdenum-nickel alloy steel plates for use in the quenched and tempered condition for the construction of welded pressure vessels. 1.2 Material under this specification is available in five types, designated “A,” “B,” “C,” “D,” and “E.” The material is also available in three classes having the following strength levels. Class Tensile Strength, ksi [MPa] 1 80 to 100 [550 to 690] 2 90 to 115 [620 to 795] 3 100 to 125 [690 to 860] 1.3 The maximum thickness of Class 1 and Class 2 plates is limited only by the capacity of the composition to meet the specified mechanical property requirements; however, current practice normally limits the maximum thickness to 12 in. [300 mm] for Types A through D and to 7 in. [180 mm] for Type E. 1.4 The maximum thickness of Class 3 plates is 21/2 in. [65 mm] for Types A through D and 2 in. [50 mm] for Type E. 1.5 The minimum nominal thickness of plates of all classes is 0.25 in. [6.5 mm]. 1.6 These alloy steel plates in the as-rolled condition are sensitive to cracking during transit and handling, particularly in thicknesses over 1 in. [25 mm]. They should be shipped in the as-rolled conditions only by mutual agreement of manufacturer and the purchaser. 1.7 Plates covered by this specification are often used in the beltline region of nuclear reactor vessels where the material properties may be affected by high levels of radiation. Appendix X1 provides some information pertinent to this usage. 1.8 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. 1.9 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.
ABSTRACT This specification covers manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates for use in welded pressure vessels. The steel materials shall be killed and shall conform to the required values of fine austenitic grain and shall also be heat treated. The steel specimens shall undergo heat analysis and product analysis and shall conform to the chemical requirements for carbon, manganese, phosphorus, sulfur, silicon, molybdenum, and nickel. Tension tests shall be performed wherein the steel specimens shall conform to the required values of tensile strength, yield strength, and elongation. SCOPE 1.1 This specification2 covers one type of manganese-molybdenum and four types of manganese-molybdenum-nickel alloy steel plates for use in the quenched and tempered condition for the construction of welded pressure vessels. 1.2 Material under this specification is available in five types, designated “A,” “B,” “C,” “D,” and “E.” The material is also available in three classes having the following strength levels. Class Tensile Strength, ksi [MPa] 1 80 to 100 [550 to 690] 2 90 to 115 [620 to 795] 3 100 to 125 [690 to 860] 1.3 The maximum thickness of Class 1 and Class 2 plates is limited only by the capacity of the composition to meet the specified mechanical property requirements; however, current practice normally limits the maximum thickness to 12 in. [300 mm] for Types A through D and to 7 in. [180 mm] for Type E. 1.4 The maximum thickness of Class 3 plates is 21/2 in. [65 mm] for Types A through D and 2 in. [50 mm] for Type E. 1.5 The minimum nominal thickness of plates of all classes is 0.25 in. [6.5 mm]. 1.6 These alloy steel plates in the as-rolled condition are sensitive to cracking during transit and handling, particularly in thicknesses over 1 in. [25 mm]. They should be shipped in the as-rolled conditions only by mutual agreement of manufacturer and the purchaser. 1.7 Plates covered by this specification are often used in the beltline region of nuclear reactor vessels where the material properties may be affected by high levels of radiation. Appendix X1 provides some information pertinent to this usage. 1.8 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. 1.9 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.
ASTM A533/A533M-24 is classified under the following ICS (International Classification for Standards) categories: 77.140.30 - Steels for pressure purposes. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM A533/A533M-24 has the following relationships with other standards: It is inter standard links to ASTM A533/A533M-16, ASTM A672/A672M-19, ASTM A20/A20M-20. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM A533/A533M-24 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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: A533/A533M − 24 Used in USDOE-NE Standards
Standard Specification for
Pressure Vessel Plates, Alloy Steel, Quenched and
Tempered, Manganese-Molybdenum and Manganese-
Molybdenum-Nickel
This standard is issued under the fixed designation A533/A533M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* properties may be affected by high levels of radiation. Appen-
2 dix X1 provides some information pertinent to this usage.
1.1 This specification covers one type of manganese-
molybdenum and four types of manganese-molybdenum- 1.8 The values stated in either inch-pound units or SI units
nickel alloy steel plates for use in the quenched and tempered are to be regarded separately as standard. Within the text, the
condition for the construction of welded pressure vessels. SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must
1.2 Material under this specification is available in five
be used independently of the other. Combining values from the
types, designated “A,” “B,” “C,” “D,” and “E.” The material is
two systems may result in nonconformance with the specifi-
also available in three classes having the following strength
cation.
levels.
1.9 This international standard was developed in accor-
Tensile Strength,
Class
ksi [MPa] dance with internationally recognized principles on standard-
1 80 to 100 [550 to 690]
ization established in the Decision on Principles for the
2 90 to 115 [620 to 795]
Development of International Standards, Guides and Recom-
3 100 to 125 [690 to 860]
mendations issued by the World Trade Organization Technical
1.3 The maximum thickness of Class 1 and Class 2 plates is
Barriers to Trade (TBT) Committee.
limited only by the capacity of the composition to meet the
specified mechanical property requirements; however, current
2. Referenced Documents
practice normally limits the maximum thickness to 12 in.
2.1 ASTM Standards:
[300 mm] for Types A through D and to 7 in. [180 mm] for
A20/A20M Specification for General Requirements for Steel
Type E.
Plates for Pressure Vessels
1.4 The maximum thickness of Class 3 plates is 2 ⁄2 in.
A435/A435M Specification for Straight-Beam Ultrasonic
[65 mm] for Types A through D and 2 in. [50 mm] for Type E.
Examination of Steel Plates
1.5 The minimum nominal thickness of plates of all classes
A577/A577M Specification for Ultrasonic Angle-Beam Ex-
is 0.25 in. [6.5 mm].
amination of Steel Plates
A578/A578M Specification for Straight-Beam Ultrasonic
1.6 These alloy steel plates in the as-rolled condition are
Examination of Rolled Steel Plates for Special Applica-
sensitive to cracking during transit and handling, particularly in
tions
thicknesses over 1 in. [25 mm]. They should be shipped in the
as-rolled conditions only by mutual agreement of manufacturer
3. General Requirements and Ordering Information
and the purchaser.
3.1 Material supplied to this material specification shall
1.7 Plates covered by this specification are often used in the
conform to Specification A20/A20M. These requirements out-
beltline region of nuclear reactor vessels where the material
line the testing and retesting methods and procedures, permit-
ted variations in dimensions, and mass, quality and repair of
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
defects, marking, loading, and ordering information.
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 March 1, 2024. Published March 2024. Originally
approved in 1965. Last previous edition approved in 2016 as A533/A533M – 16. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/A0533_A0533M-24. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
For ASME Boiler and Pressure Vessel Code applications, see related Specifi- Standards volume information, refer to the standard’s Document Summary page on
cation SA-533/SA-533M in Section II of that Code. 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
A533/A533M − 24
TABLE 1 Chemical Requirements
4. Manufacture
NOTE 1—Where “.” appears there is no requirement.
4.1 Steelmaking Practice—The steel shall be killed and
Composition, % shall conform to the fine austenitic grain requirement of
Type A Type B Type C Type D Type E Specification A20/A20M.
A
Carbon, max 0.25 0.25 0.25 0.25 0.20
B
Manganese:
5. Heat Treatment
Heat analysis 1.15–1.50 1.15–1.50 1.15–1.50 1.15–1.50 1.15–1.70
Product analysis 1.07–1.62 1.07–1.62 1.07–1.62 1.07–1.62 1.04–1.84
5.1 All plates shall be heat treated by heating to a suitable
A
Phosphorus, max 0.025 0.025 0.025 0.025 0.020
A temperature within the range from 1550 °F to 1800 °F [845 °C
Sulfur, max
0.025 0.025 0.025 0.025 0.015
Silicon:
to 980 °C], holding for a sufficient time to obtain uniform
Heat analysis 0.15–0.40 0.15–0.40 0.15–0.40 0.15–0.40 0.15–0.40
temperature throughout the plate thickness and then quenching,
Product analysis 0.13–0.45 0.13–0.45 0.13–0.45 0.13–0.45 0.13–0.45
in water. Subsequently the plates shall be tempered at a suitable
Molybdenum:
Heat analysis 0.45–0.60 0.45–0.60 0.45–0.60 0.45–0.60 0.25–0.60
temperature to produce the specified properties, but not less
Product analysis 0.41–0.64 0.41–0.64 0.41–0.64 0.41–0.64 0.21–0.64
than 1100 °F [595 °C] with a minimum holding time of ⁄2 h ⁄in.
Nickel:
[1.2 min/mm] of thickness, but not less than ⁄2 h.
Heat analysis . . . 0.40–0.70 0.70–1.00 0.20–0.40 0.60–1.00
Product analysis . . . 0.37–0.73 0.67–1.03 0.17–0.43 0.57–1.03
5.2 When the plates are heat treated by the fabricator, it
Chromium, max:
Heat anal
...
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: A533/A533M − 16 A533/A533M − 24 Used in USDOE-NE Standards
Standard Specification for
Pressure Vessel Plates, Alloy Steel, Quenched and
Tempered, Manganese-Molybdenum and Manganese-
Molybdenum-Nickel
This standard is issued under the fixed designation A533/A533M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers one type of manganese-molybdenum and four types of manganese-molybdenum-nickel alloy steel
plates for use in the quenched and tempered condition for the construction of welded pressure vessels.
1.2 Material under this specification is available in five types, designated “A”, “B”, “C”, “D”, and “E”.“A,” “B,” “C,” “D,” and
“E.” The material is also available in three classes having the following strength levels.
Tensile Strength,
Class
ksi [MPa]
1 80–100 [550 to 690]
1 80 to 100 [550 to 690]
2 90–115 [620 to 795]
2 90 to 115 [620 to 795]
3 100–125 [690 to 860]
3 100 to 125 [690 to 860]
1.3 The maximum thickness of Class 1 and Class 2 plates is limited only by the capacity of the composition to meet the specified
mechanical property requirements; however, current practice normally limits the maximum thickness to 12 in. [300 mm] [300 mm]
for Types A through D and to 7 in. [180 mm] for Type E.
1.4 The maximum thickness of Class 3 plates is 2 ⁄2 in. [65 mm] [65 mm] for Types A through D and 2 in. [50 mm] for Type E.
1.5 The minimum nominal thickness of plates of all classes is 0.25 in. [6.5 mm].
1.6 These alloy steel plates in the as-rolled condition are sensitive to cracking during transit and handling, particularly in
thicknesses over about 1 or 2 in. [25 or 50 mm]. 1 in. [25 mm]. They should be shipped in the as-rolled conditions only by mutual
agreement of manufacturer and the purchaser.
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, 2016March 1, 2024. Published May 2016March 2024. Originally approved in 1965. Last previous edition approved in 20142016 as
A533/A533M – 09 (2014). DOI: 10.1520/A0533_A0533M-16.16. DOI: 10.1520/A0533_A0533M-24.
For ASME Boiler and Pressure Vessel Code applications, see related Specification SA-533/SA-533M in Section II of that Code.
*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
A533/A533M − 24
1.7 Plates covered by this specification are often used in the beltline region of nuclear reactor vessels where the material properties
may be affected by high levels of radiation. Appendix X1 provides some information pertinent to this usage.
1.8 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.
1.9 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
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 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.
TABLE 1 Chemical Requirements
NOTE 1—Where “.” appears there is no requirement.
Composition, %
Type A Type B Type C Type D Type E
A
Carbon, max 0.25 0.25 0.25 0.25 0.20
B
Manganese:
Heat analysis 1.15–1.50 1.15–1.50 1.15–1.50 1.15–1.50 1.15–1.70
Product analysis 1.07–1.62 1.07–1.62 1.07–1.62 1.07–1.62 1.04–1.84
A
Phosphorus, max 0.025 0.025 0.025 0.025 0.020
A
Sulfur, max
0.025 0.025 0.025 0.025 0.015
Silicon:
Heat analysis 0.15–0.40 0.15–0.40 0.15–0.40 0.15–0.40 0.15–0.40
Product analysis 0.13–0.45 0.13–0.45 0.13–0.45 0.13–0.45 0.13–0.45
Molybdenum:
Heat analysis 0.45–0.60 0.45–0.60 0.45–0.60 0.45–0.60 0.25–0.60
Product analysis 0.41–0.64 0.41–0.64 0.41–0.64 0.41–0.64 0.21–0.64
Nickel:
Heat analysis . . . 0.40–0.70 0.70–1.00 0.20–0.40 0.60–1.00
Product analysis . . . 0.37–0.73 0.67–1.03 0.17–0.43 0.57–1.03
Chromium, max:
Heat analysis . . . . . . . . . . . . 0.60
Product analysis . . . . . . . . . . . . 0.64
A
Applies to both heat and product analyses.
B
For Types A, B, C, and D, the maximum manganese content may be increased
to 1.60 % on heat analysis and 1.65 % on product analysis when Class 2 or Class
3 properties are specified and when Supplementary Requirement S3 (see
Specification A20/A20M) is specified with a total holding time of more than 1 h/in.
[2.4 min/mm] of thickness.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of AST
...
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