ASTM A542/A542M-19

Standard Specification for Pressure Vessel Plates, Alloy Steel, Quenched-and-Tempered, Chromium-Molybdenum, and Chromium-Molybdenum-Vanadium

ABSTRACT
This specification covers pressure vessel plates, alloy steel, quenched-and-tempered, chromium-molybdenum, and chromium-molybdenum-vanadium. As a steel making practice, the steel shall be killed and shall conform to specified fine austenitic grain size requirements. Plate types A, B, C, D, and E shall be heat treated by heating to a suitable austenitizing temperature, holding for a sufficient period of time to attain uniform temperature throughout the thickness, and quenching in a suitable liquid medium by spraying or immersion. The steel shall conform to the required chemical compositions. The required mechanical properties that include tension test requirements and notch toughness requirements are presented in details.
SCOPE
1.1 This specification2 covers two types of 21/4 Cr-1 Mo and three types of Cr-Mo-V alloy steel plates for use in the quenched-and-tempered condition, intended for the fabrication of welded pressure vessels and components.  
1.2 Material under this specification is available in five types, designated “A,” “B,” “C,” “D,” and “E.” Type B is identical to Type A except for restrictive limits for carbon, phosphorus, sulfur, and nickel. The material is also available in five classes having the following strength levels. Type E is available only as Class 4 and 4a.    
Class  
Minimum Tensile Strength, ksi [MPa]    
1  
105 [725]    
2  
115 [795]    
3  
95 [655]    
4 and 4a  
85 [585]  
1.3 The maximum thickness of plates is limited only by the capacity of the chemical composition to meet the specified mechanical property requirements.  
1.4 The minimum thickness of plates is limited to 3/16 in. [5 mm].  
1.5 The material is intended to be suitable for fusion welding. Welding technique is of fundamental importance and it is presupposed that welding procedures will be in accordance with approved methods.  
1.6 These alloy steel plates in the as-rolled condition are sensitive to cracking during flame cutting, transit, and handling. They should be shipped in the as-rolled condition only with the mutual agreement of the manufacturer and the purchaser or fabricator.  
1.7 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.  
1.8 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: 30-Apr-2019
• ICS: 77.140.30 - Steels for pressure purposes
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.11 - Steel Plates for Boilers and Pressure Vessels

Relations

• Replaces: ASTM A542/A542M-13 - Standard Specification for Pressure Vessel Plates, Alloy Steel, Quenched-and-Tempered, Chromium-Molybdenum, and Chromium-Molybdenum-Vanadium
• Effective Date: 01-May-2019
• Refers: ASTM A370-24 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Mar-2024
• Refers: ASTM A577/A577M-17(2023) - Standard Specification for Ultrasonic Angle-Beam Examination of Steel Plates
• Effective Date: 01-Nov-2023
• Refers: ASTM A435/A435M-17(2023) - Standard Specification for Straight-Beam Ultrasonic Examination of Steel Plates
• Effective Date: 01-Nov-2023
• Refers: ASTM A578/A578M-17(2023) - Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications
• Effective Date: 01-Nov-2023
• Refers: ASTM A387/A387M-17a(2023) - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum
• Effective Date: 01-Sep-2023
• Refers: ASTM A370-19 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Jul-2019
• Refers: ASTM A20/A20M-18 - Standard Specification for General Requirements for Steel Plates for Pressure Vessels
• Effective Date: 01-Mar-2018
• Refers: ASTM A20/A20M-17 - Standard Specification for General Requirements for Steel Plates for Pressure Vessels
• Effective Date: 15-Nov-2017
• Refers: ASTM A370-17a - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 15-Nov-2017
• Refers: ASTM A387/A387M-17a - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum
• Effective Date: 01-Nov-2017
• Refers: ASTM A578/A578M-17 - Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications
• Effective Date: 01-Nov-2017
• Refers: ASTM A387/A387M-17 - Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum
• Effective Date: 15-Mar-2017
• Refers: ASTM A370-17 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Jan-2017
• Refers: ASTM A370-15 - Standard Test Methods and Definitions for Mechanical Testing of Steel Products
• Effective Date: 01-Nov-2015

Overview

ASTM A542/A542M-19 is the standard specification developed by ASTM International for pressure vessel plates made from alloy steel. These plates are quenched-and-tempered and utilize chromium-molybdenum or chromium-molybdenum-vanadium alloys, offering enhanced mechanical properties suitable for pressure-containing parts in demanding environments. The standard details requirements for the chemical composition, mechanical performance, heat treatment, and testing of steel plates intended for welded pressure vessels and associated components.

Key Topics

• Material Types and Classes:
  ASTM A542/A542M-19 covers two types of 2¼Cr-1Mo alloy steels and three types of Cr-Mo-V alloy steels. Materials are classified into five types (A, B, C, D, E) and five classes (1, 2, 3, 4, 4a), each with specific minimum tensile strength requirements, ranging from 85 ksi [585 MPa] to 115 ksi [795 MPa]. Type E is limited to Classes 4 and 4a.

• Thickness Limitations:
  Plate thickness is governed by the material’s ability to meet the specified mechanical properties, with a minimum thickness of 3/16 in. [5 mm] and no defined upper limit beyond chemical and mechanical compliance.

• Heat Treatment:
  All material types require precise heat treatment, involving austenitizing, quenching in a suitable liquid, and tempering at minimum specified temperatures. The intent is to achieve uniform mechanical properties throughout the plate thickness.

• Weldability and Handling:
  These alloy steel plates are designed for fusion welding, but the selection of the welding technique is crucial to ensure integrity. Plates can be sensitive to cracking during flame cutting or transit and should only be shipped as-rolled by mutual agreement between supplier and purchaser.

• Testing and Quality Assurance:
  The standard specifies tension test and notch toughness (Charpy V-notch) requirements, particularly for higher toughness classes, to ensure the steel’s suitability for pressure applications. Supplementary requirements for vacuum treatment, additional testing, non-destructive examination, and step cooling impact testing are available as agreed.

Applications

• Welded Pressure Vessels:
  ASTM A542/A542M alloy steel plates are primarily used in the fabrication of welded pressure vessels and boiler components for industries such as power generation, petrochemical, oil and gas, and chemical processing, where high strength, toughness, and resistance to elevated temperatures are critical.

• High-Temperature Service:
  The enhanced alloy compositions provide improved resistance to thermal cycling and mechanical stress, making these plates well-suited for reactors, separators, and piping systems operating under high pressure and temperature.

• Compliance with Global Codes:
  Meeting ASTM A542/A542M facilitates compliance with international codes such as the ASME Boiler and Pressure Vessel Code, helping project designers and fabricators ensure global market acceptance and code adherence.

Related Standards

• ASTM A20/A20M: General requirements for steel plates for pressure vessels, referenced for supplementary and detailed provisions.
• ASTM A370: Standard test methods and definitions for mechanical testing of steel products, including tension and impact testing procedures.
• ASTM A387/A387M: Specifications for pressure vessel plates, chromium-molybdenum alloy steel.
• ASTM A435/A435M, A577/A577M, A578/A578M: Specifications for ultrasonic examination methods for steel plates.
• ASME SA-542: Equivalent requirements for use under the ASME Boiler and Pressure Vessel Code.

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Keywords: ASTM A542, pressure vessel steel plate, quenched-and-tempered alloy steel, chromium-molybdenum steel, Cr-Mo-V steel, welded pressure vessels, mechanical properties, heat treatment, toughness, industrial standards, ASTM standards.

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:A542/A542M −19
Standard Specification for
Pressure Vessel Plates, Alloy Steel, Quenched-and-
Tempered, Chromium-Molybdenum, and Chromium-
Molybdenum-Vanadium
This standard is issued under the fixed designationA542/A542M; 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* SI units are shown in brackets. The values stated in each
2 system are not exact equivalents, therefore, each system must
1.1 Thisspecification coverstwotypesof2 ⁄4Cr-1Moand
beusedindependentlyoftheother.Combiningvaluesfromthe
three types of Cr-Mo-V alloy steel plates for use in the
two systems may result in nonconformance with this specifi-
quenched-and-tempered condition, intended for the fabrication
cation.
of welded pressure vessels and components.
1.8 This international standard was developed in accor-
1.2 Material under this specification is available in five
dance with internationally recognized principles on standard-
types, designated “A,” “B,” “C,” “D,” and “E.” Type B is
ization established in the Decision on Principles for the
identical to Type A except for restrictive limits for carbon,
Development of International Standards, Guides and Recom-
phosphorus,sulfur,andnickel.Thematerialisalsoavailablein
mendations issued by the World Trade Organization Technical
five classes having the following strength levels. Type E is
Barriers to Trade (TBT) Committee.
available only as Class 4 and 4a.
Class Minimum Tensile Strength, ksi [MPa]
2. Referenced Documents
1 105 [725]
2 115 [795] 2.1 ASTM Standards:
3 95 [655]
A20/A20MSpecificationforGeneralRequirementsforSteel
4 and 4a 85 [585]
Plates for Pressure Vessels
1.3 The maximum thickness of plates is limited only by the
A370Test Methods and Definitions for Mechanical Testing
capacity of the chemical composition to meet the specified
of Steel Products
mechanical property requirements.
A387/A387MSpecificationforPressureVesselPlates,Alloy
Steel, Chromium-Molybdenum
1.4 The minimum thickness of plates is limited to ⁄16in. [5
A435/A435MSpecification for Straight-Beam Ultrasonic
mm].
Examination of Steel Plates
1.5 The material is intended to be suitable for fusion
A577/A577MSpecification for Ultrasonic Angle-Beam Ex-
welding. Welding technique is of fundamental importance and
amination of Steel Plates
itispresupposedthatweldingprocedureswillbeinaccordance
A578/A578MSpecification for Straight-Beam Ultrasonic
with approved methods.
Examination of Rolled Steel Plates for Special Applica-
1.6 These alloy steel plates in the as-rolled condition are
tions
sensitive to cracking during flame cutting, transit, and han-
dling. They should be shipped in the as-rolled condition only 3. General Requirements and Ordering Information
with the mutual agreement of the manufacturer and the
3.1 Material supplied to this material specification shall
purchaser or fabricator.
conform to Specification A20/A20M. These requirements out-
line the testing and retesting methods and procedures, permit-
1.7 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the ted 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
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
specification,certainsupplementaryrequirementsareavailable
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.11 on Steel Plates for Boilers and Pressure Vessels.
Current edition approved May 1, 2019. Published May 2019. Originally
approved in 1965. Last previous edition approved in 2013 as A542/A542M–13. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/A0542_A0542M-19. contact ASTM Customer Service at [e-mail]. 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-542 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
A542/A542M−19
TABLE 1 Chemical Requirements
NOTE 1—Where “.” appears there is no requirement. Values are maximum unless minimum or a range is indicated.
Composition, %
Element
Type A Type B Type C Type D Type E
Carbon:
Heat analysis 0.15 0.11–0.15 0.10–0.15 0.11–0.15 0.10–0.15
Product analysis 0.18 0.09–0.18 0.08–0.18 0.09–0.18 0.08–0.18
Manganese:
Heat analysis 0.30–0.60 0.30–0.60 0.30–0.60 0.30–0.60 0.30–0.60
Product analysis 0.25–0.66 0.25–0.66 0.25–0.66 0.25–0.66 0.25–0.66
Phosphorus:
Heat analysis 0.025 0.015 0.025 0.015 0.025
Product analysis 0.025 0.015 0.025 0.020 0.025
Sulfur:
Heat analysis 0.025 0.015 0.025 0.010 0.010
Product analysis 0.025 0.015 0.025 0.015 0.010
Silicon:
Heat analysis 0.50 0.50 0.13 0.10 0.15
Product analysis 0.50 0.50 0.13 0.13 0.15
Chromium:
Heat analysis 2.00–2.50 2.00–2.50 2.75–3.25 2.00–2.50 2.75–3.25
Product analysis 1.88–2.62 1.88–2.62 2.63–3.37 1.88–2.62 2.63–3.37
Molybdenum:
Heat analysis 0.90–1.10 0.90–1.10 0.90–1.10 0.90–1.10 0.90–1.10
Product analysis 0.85–1.15 0.85–1.15 0.85–1.15 0.85–1.15 0.85–1.15
Copper:
Heat analysis 0.40 0.25 0.25 0.20 0.25
Product analysis 0.43 0.28 0.28 0.23 0.28
Nickel:
Heat analysis 0.40 0.25 0.25 0.25 0.25
Product analysis 0.43 0.28 0.28 0.28 0.28
Vanadium:
Heat analysis 0.03 0.02 0.20–0.30 0.25–0.35 0.20–0.30
Product analysis 0.04 0.03 0.18–0.33 0.23–0.37 0.18–0.33
Titanium:
Heat analysis . . . . . . 0.015–0.035 0.030 . . .
Product analysis . . . . . . 0.005–0.045 0.035 . . .
Boron:
Heat analysis . . . . . . 0.001–0.003 0.0020 . . .
Product analysis . . . . . . . . . . . . . . .
A
Columbium (niobium):
Heat analysis . . . . . . . . . 0.07 0.015–0.070
Product analysis . . . . . . . . . 0.08 0.010–0.075
A
Columbium and niobium are interchangeable names for the same element and both names are acceptable for use in A01 specifications.
when additional control, testing, or examination is required to temperature shall be 1650°F [900°C]. ForType E material, the
meet end use requirements. The purchaser is referred to the minimum austenitizing temperature shall be 1850°F [1010°C].
listed supplementary requirements in this specification and to
5.2 Afterquenching,theplatesshallbetemperedtoproduce
the detailed requirements in Specification A20/A20M.
the specified tensile requirements by heating to a suitable
3.3 If the requirements of this specification are in conflict
temperature and holding for a period of time of not less that 30
withtherequirementsofSpecificationA20/A20M,therequire- min/in. [1.2 min/mm] of thickness but not less than ⁄2h. The
ments of this specification shall prevail.
minimum tempering temperature shall be as follows:
Type Class Temperature, °F [°C]
4. Manufacture
A, B, C 1, 2, 3 1050 [565]
A, B, C 4 1200 [650]
4.1 Steelmaking Practice—The steel shall be killed and
A, B, C, D 4a 1250 [675]
shall conform to the fine austenitic grain size requirement of
5.3 Plates over 4 in. [100 mm] in thickness shall receive a
Specification A20/A20M.
prior heat treatment of normalizing at, or water quenching
from,atemperaturewithintherangefrom1650to1850°F[900
5. Heat Treatment
to1010°C]forTypesA,B,C,andDand1850to2050°F[1010
5.1 All plates shall be heat treated by heating to a suitable
to 1120°C] for Type E before the heat treatment specified in
austenitizing temp
...

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: A542/A542M − 13 A542/A542M − 19
Standard Specification for
Pressure Vessel Plates, Alloy Steel, Quenched-and-
Tempered, Chromium-Molybdenum, and Chromium-
Molybdenum-Vanadium
This standard is issued under the fixed designation A542/A542M; 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*
1.1 This specification covers two types of 2 ⁄4 Cr-1 Mo and three types of Cr-Mo-V alloy steel plates for use in the
quenched-and-tempered condition, intended for the fabrication of welded pressure vessels and components.
1.2 Material under this specification is available in five types, designated “A,” “B,” “C,” “D,” and “E.” Type B is identical to
Type A except for restrictive limits for carbon, phosphorus, sulfur, and nickel. The material is also available in five classes having
the following strength levels. Type E is available only as Class 4 and 4a.
Class Minimum Tensile Strength, ksi [MPa]
1 105 [725]
2 115 [795]
3 95 [655]
4 and 4a 85 [585]
1.3 The maximum thickness of plates is limited only by the capacity of the chemical composition to meet the specified
mechanical property requirements.
1.4 The minimum thickness of plates is limited to ⁄16 in. [5 mm].
1.5 The material is intended to be suitable for fusion welding. Welding technique is of fundamental importance and it is
presupposed that welding procedures will be in accordance with approved methods.
1.6 These alloy steel plates in the as-rolled condition are sensitive to cracking during flame cutting, transit, and handling. They
should be shipped in the as-rolled condition only with the mutual agreement of the manufacturer and the purchaser or fabricator.
1.7 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.
1.8 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
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A387/A387M Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum
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
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, 2013May 1, 2019. Published June 2013May 2019. Originally approved in 1965. Last previous edition approved in 20092013 as
A542/A542M – 09.A542/A542M – 13. DOI: 10.1520/A0542_A0542M-13.10.1520/A0542_A0542M-19.
For ASME Boiler and Pressure Vessel Code applications, see related Specification SA-542 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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
A542/A542M − 19
TABLE 1 Chemical Requirements
NOTE 1—Where “.” appears there is no requirement. Values are maximum unless minimum or a range is indicated.
Composition, %
Element
Type A Type B Type C Type D Type E
Carbon:
Heat analysis 0.15 0.11–0.15 0.10–0.15 0.11–0.15 0.10–0.15
Product analysis 0.18 0.09–0.18 0.08–0.18 0.09–0.18 0.08–0.18
Manganese:
Heat analysis 0.30–0.60 0.30–0.60 0.30–0.60 0.30–0.60 0.30–0.60
Product analysis 0.25–0.66 0.25–0.66 0.25–0.66 0.25–0.66 0.25–0.66
Phosphorus:
Heat analysis 0.025 0.015 0.025 0.015 0.025
Product analysis 0.025 0.015 0.025 0.020 0.025
Sulfur:
Heat analysis 0.025 0.015 0.025 0.010 0.010
Product analysis 0.025 0.015 0.025 0.015 0.010
Silicon:
Heat analysis 0.50 0.50 0.13 0.10 0.15
Product analysis 0.50 0.50 0.13 0.13 0.15
Chromium:
Heat analysis 2.00–2.50 2.00–2.50 2.75–3.25 2.00–2.50 2.75–3.25
Product analysis 1.88–2.62 1.88–2.62 2.63–3.37 1.88–2.62 2.63–3.37
Molybdenum:
Heat analysis 0.90–1.10 0.90–1.10 0.90–1.10 0.90–1.10 0.90–1.10
Product analysis 0.85–1.15 0.85–1.15 0.85–1.15 0.85–1.15 0.85–1.15
Copper:
Heat analysis 0.40 0.25 0.25 0.20 0.25
Product analysis 0.43 0.28 0.28 0.23 0.28
Nickel:
Heat analysis 0.40 0.25 0.25 0.25 0.25
Product analysis 0.43 0.28 0.28 0.28 0.28
Vanadium:
Heat analysis 0.03 0.02 0.20–0.30 0.25–0.35 0.20–0.30
Product analysis 0.04 0.03 0.18–0.33 0.23–0.37 0.18–0.33
Titanium:
Heat analysis . . . . . . 0.015–0.035 0.030 . . .
Product analysis . . . . . . 0.005–0.045 0.035 . . .
Boron:
Heat analysis . . . . . . 0.001–0.003 0.0020 . . .
Product analysis . . . . . . . . . . . . . . .
Columbium:
A
Columbium (niobium):
Heat analysis . . . . . . . . . 0.07 0.015–0.070
Product analysis . . . . . . . . . 0.08 0.010–0.075
A
Columbium and niobium are interchangeable names for the same element and both names are acceptable for use in A01 specifications.
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.
5. Heat Treatment
5.1 All plates shall be heat treated by heating to a suitable austenitizing temperature, holding for a sufficient period of time to
attain uniform temperature throughout the thickness, and quenching in a suitable liquid medium by spraying or immersion. For
Type D material, the minimum austenitizing temperature shall be 1650°F [900°C]. For Type E material, the minimum austenitizing
temperature shall be 1850°F [1010°C].
A542/A542M − 19
TABLE 2 Tensile Requirements
Class 1 Class 2 Class 3 Class 4 Class 4a
Tensile strength, ksi [MPa] 105–125 [725–860] 115–135 [795–930] 95–115 [655–795] 85–110 [585–760] 85–110 [585–760]
Yield strength, min, ksi [MPa] 85 [585] 100 [690] 75 [515] 55 [380] 60 [415]
A
Elongation in 2 in. [50 mm], min, % 14 13 20 20 18
A
See Specification A20/A20M for elongation adjustment.
5.2 After quenching, the plates
...