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ASTM A638/A638M-23

(Specification)

Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

ABSTRACT
This specification covers hot-finished or cold-finished precipitation hardening iron base superalloy bars, forgings, and forging stock for high-temperature service. The mechanical properties of these alloys are developed by suitable solution treating and precipitation hardening treatments. Two grades of iron base alloy are covered; Grade 660 and Grade 662 (bars and forgings). The material shall meet the requirements as to stress rupture properties specified. The material shall conform to the chemical, mechanical, and metallurgical properties requirements specified.
SCOPE
1.1 This specification2 covers hot-finished or cold-finished precipitation hardening iron base superalloy bars, forgings, and forging stock for high-temperature service. The mechanical properties of these alloys are developed by suitable solution treating and precipitation hardening treatments.  
1.2 Two grades of iron base alloy are covered. Selection will depend upon design, service conditions, mechanical properties, and elevated temperature characteristics.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.4 Unless the order specifies an “M” designation, the material shall be furnished to inch-pound units.  
1.5 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-2023
ICS
77.140.60 - Steel bars and rods
77.140.85 - Iron and steel forgings
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.17 - Flat-Rolled and Wrought Stainless Steel
Current Stage
Ref Project

Relations

Refers
ASTM A484/A484M-20a - Standard Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings
Effective Date
05-May-2020

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ASTM A638/A638M-23 - Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature ServiceASTM A638/A638M-23 - Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service
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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: A638/A638M − 23
Standard Specification for
Precipitation Hardening Iron Base Superalloy Bars,
1
Forgings, and Forging Stock for High-Temperature Service
This standard is issued under the fixed designation A638/A638M; 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* A751 Test Methods and Practices for Chemical Analysis of
2 Steel Products
1.1 This specification covers hot-finished or cold-finished
A788/A788M Specification for Steel Forgings, General Re-
precipitation hardening iron base superalloy bars, forgings, and
quirements
forging stock for high-temperature service. The mechanical
E30 Test Methods for Chemical Analysis of Steel, Cast Iron,
properties of these alloys are developed by suitable solution
4
Open-Hearth Iron, and Wrought Iron (Withdrawn 1995)
treating and precipitation hardening treatments.
E527 Practice for Numbering Metals and Alloys in the
1.2 Two grades of iron base alloy are covered. Selection will
Unified Numbering System (UNS)
depend upon design, service conditions, mechanical properties,
and elevated temperature characteristics.
3. Ordering Information
1.3 The values stated in either SI units or inch-pound units
3.1 It is the responsibility of the purchaser to specify all
are to be regarded separately as standard. SI units are shown in
requirements that are necessary for material ordered under this
brackets. The values stated in each system are not necessarily
specification. Such requirements may include, but are not
exact equivalents; therefore, to ensure conformance with the
limited to, the following:
standard, each system shall be used independently of the other,
3.1.1 Quantity (weight or number of pieces),
and values from the two systems shall not be combined.
3.1.2 Name of material (precipitation hardening iron base
superalloy),
1.4 Unless the order specifies an “M” designation, the
3.1.3 Form (bars, forgings, and forging stock),
material shall be furnished to inch-pound units.
3.1.4 Dimensions (in the case of rough or finished forgings
1.5 This international standard was developed in accor-
the order shall be accompanied by a print or drawing or
dance with internationally recognized principles on standard-
otherwise adequately described as to the shape and dimension),
ization established in the Decision on Principles for the
3.1.5 Grade designation (Table 1),
Development of International Standards, Guides and Recom-
3.1.6 Condition (Section 5),
mendations issued by the World Trade Organization Technical
3.1.7 Finish (Section 3),
Barriers to Trade (TBT) Committee.
3.1.8 Mechanical requirements (Section 8),
3.1.9 ASTM designation, and
2. Referenced Documents
3.1.10 Special requirements.
3
2.1 ASTM Standards:
A484/A484M Specification for General Requirements for
4. General Requirements
Stainless Steel Bars, Billets, and Forgings
4.1 In addition to the requirements of this specification, all
requirements of the current edition of Specification A484/
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
A484M shall apply. Forgings shall comply with the Terminol-
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
ogy and Forging sections of Specification A788/A788M,
A01.17 on Flat-Rolled and Wrought Stainless Steel.
which further clarify the forging definitions in the Terminology
Current edition approved May 1, 2023. Published May 2023. Originally
approved in 1970. Last previous edition approved in 2020 as A638/A638M – 20.
section of Specification A484/A484M. Failure to comply with
DOI: 10.1520/A0638_A0638M-23.
the general requirements of Specification A484/A484M con-
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
stitutes nonconformance with this specification.
cation SA-638 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
4
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*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 ----------------------
A638/A638M − 23
TABLE 1 Mechanical Property Requirements
A
Grade 6
...

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: A638/A638M − 20 A638/A638M − 23
Standard Specification for
Precipitation Hardening Iron Base Superalloy Bars,
1
Forgings, and Forging Stock for High-Temperature Service
This standard is issued under the fixed designation A638/A638M; 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 hot-finished or cold-finished precipitation hardening iron base superalloy bars, forgings, and forging
stock for high-temperature service. The mechanical properties of these alloys are developed by suitable solution treating and
precipitation hardening treatments.
1.2 Two grades of iron base alloy are covered. Selection will depend upon design, service conditions, mechanical properties, and
elevated temperature characteristics.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. SI units are shown in
brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the
standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.4 Unless the order specifies an “M” designation, the material shall be furnished to inch-pound units.
1.5 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
3
2.1 ASTM Standards:
A484/A484M Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings
A751 Test Methods and Practices for Chemical Analysis of Steel Products
A788/A788M Specification for Steel Forgings, General Requirements
4
E30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron (Withdrawn 1995)
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
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 A01.17
on Flat-Rolled and Wrought Stainless Steel.
Current edition approved March 1, 2020May 1, 2023. Published March 2020May 2023. Originally approved in 1970. Last previous edition approved in 20102020 as
ε1
A638/A638M – 10 (2018)A638/A638M – 20. . DOI: 10.1520/A0638_A0638M-20.10.1520/A0638_A0638M-23.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-638 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.
4
The last approved version of this historical standard is referenced on www.astm.org.
*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 ----------------------
A638/A638M − 23
3. Ordering Information
3.1 It is the responsibility of the purchaser to specify all requirements that are necessary for material ordered under this
specification. Such requirements may include, but are not limited to, the following:
3.1.1 Quantity (weight or number of pieces),
3.1.2 Name of material (precipitation hardening iron base superalloy),
3.1.3 Form (bars, forgings, and forging stock),
3.1.4 Dimensions (in the case of rough or finished forgings the order shall be accompanied by a print or drawing or otherwise
adequately described as to the shape and dimension),
3.1.5 Grade designation (Table 1),
3.1.6 Condition (Section 5),
3.1.7 Finish (Section 3),
3.1.8 Mechanical requirements (Section 8),
3.1.9 ASTM designation, and
3.1.10 Special requirements.
4. General Requirements
4.1 In addition to the requirements of this specification, all requirements of the current edition of Specification A484/A484M shall
apply. Forgings shall comply with the Terminology and Forging sections of Specification A788/A788M, which further clarify the
forging definitions in the Terminology section of
...

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1.2.1 Energetic and other new/novel materials and compositions in all stages of research, development, test and evaluation.  
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1.2.2.1 Human and ecological effects of the unexploded energetics and ...

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  • Guide
    9 pages
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ASTM
ASTM D8042-18(2023)(Test Method)
Test Method for Shrinkage Temperature of Wet Blue and Wet White

SIGNIFICANCE AND USE
5.1 This test method is designed to determine the temperature at which the Wet Blue or Wet White specimen experiences shrinkage. In this test method, shrinkage occurs as a result of hydrothermal denaturation of the collagen protein molecules which make up the fiber structure of the Wet Blue or Wet White. The shrinkage temperature of Wet Blue or Wet White is influenced by many different factors, most of which appear to affect the number and nature of crosslinking interactions between adjacent polypeptide chains of the collagen protein molecules. The value of the shrinkage temperature of Wet Blue or Wet White is commonly used as an indicator of the type of tannage or the degree of tannage, or both, of that particular Wet Blue or Wet White (especially for the more hydrothermally stable tannages such as chrome tannage).
SCOPE
1.1 This test method covers the determination of the shrinkage temperature of all types of Wet Blue and Wet White. The heating medium is water when the shrinkage temperature is at or below 98 °C. The heating medium is a glycerine-water solution when the shrinkage temperature is above 98 °C.  
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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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ASTM
ASTM D8530/D8530M-23(Guide)
Standard Guide for the Selection and Use of Waterstops

SIGNIFICANCE AND USE
4.1 This guide is intended to be used in the selection and installation of waterstops in cast-in-place concrete construction. This guide is intended to assist the building owner, owner’s representative, architect, engineer, contractor, and/or authorized inspector during the specification and installation of waterstops.  
4.2 This guide is applicable to cast-in-place concrete construction. The use of this guide may not be appropriate for installation of waterstops in other types of concrete construction, including but not limited to, pneumatically applied (that is, shotcrete) and precast concrete construction.
SCOPE
1.1 This guide covers the use of waterstops within cast-in-place concrete construction. Waterstops are generally placed within static, non-moving construction joints in concrete to close off the joint to water, which may be under significant hydrostatic pressure. They are used as part of the overall waterproofing strategy for a building or other structure. Expansion and other types of moving joints may require the use of waterstops, which can accommodate the anticipated movement of the structure and are beyond the scope of this guide.  
1.2 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 nonconformance with the standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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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ASTM
ASTM E2956-23(Guide)
Standard Guide for Monitoring the Neutron Exposure of LWR Reactor Pressure Vessels

SIGNIFICANCE AND USE
4.1 Regulatory Requirements—The USA Code of Federal Regulations (10CFR Part 50, Appendix H) requires the implementation of a reactor vessel materials surveillance program for all operating LWRs. Other countries have similar regulations. The purpose of the program is to (1) monitor changes in the fracture toughness properties of ferritic materials in the reactor vessel beltline6 resulting from exposure to neutron irradiation and the thermal environment, and (2) make use of the data obtained from surveillance programs to determine the conditions under which the vessel can be operated with adequate margins of safety throughout its service life. Practice E185, derived mechanical property data, and (r, θ, z) physics-dosimetry data (derived from the calculations and reactor cavity and surveillance capsule measurements (1) using physics-dosimetry standards) can be used together with information in Guide E900 and Refs. 4, 11-18 to provide a relation between property degradation and neutron exposure, commonly called a “trend curve.” To obtain this trend curve at all points in the pressure vessel wall requires that the selected trend curve be used together with the appropriate (r, θ, z) neutron field information derived by use of this guide to accomplish the necessary interpolations and extrapolations in space and time.  
4.2 Neutron Field Characterization—The tasks required to satisfy the second part of the objective of 4.1 are complex and are summarized in Practice E853. In doing this, it is necessary to describe the neutron field at selected (r, θ, z) points within the pressure vessel wall. The description can be either time dependent or time averaged over the reactor service period of interest. This description can best be obtained by combining neutron transport calculations with plant measurements such as reactor cavity (ex-vessel) and surveillance capsule or RPV cladding (in-vessel) measurements, benchmark irradiations of dosimeter sensor materials, and knowledge of th...
SCOPE
1.1 This guide establishes the means and frequency of monitoring the neutron exposure of the LWR reactor pressure vessel throughout its operating life.  
1.2 The physics-dosimetry relationships determined from this guide may be used to estimate reactor pressure vessel damage through the application of Practice E693 and Guide E900, using fast neutron fluence (E > 1.0 MeV and E > 0.1 MeV), displacements per atom (dpa), or damage-function-correlated exposure parameters as independent exposure variables. Supporting the application of these standards are the E853, E944, E1005, and E1018 standards, identified in 2.1.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 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.

  • Guide
    12 pages
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  • Guide
    12 pages
    English language
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