ASTM A638/A638M-10

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 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 inch-pound units or SI (metric) units are to be regarded separately as standards; within the text and tables, the SI units are shown in [brackets]. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other. Combining values from the two systems may result in nonconformance with the specification.  
1.4 Unless the order specifies an “M” designation, the material shall be furnished to inch-pound units.

General Information

• Status: Historical
• Publication Date: 31-Mar-2010
• ICS: 77.140.60 - Steel bars and rods
• ICS: 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

Relations

• Replaces: ASTM A638/A638M-00(2004) - Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service
• Effective Date: 01-Apr-2010
• Replaced By: ASTM A638/A638M-10(2018)e1 - Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service
• Effective Date: 01-Jun-2018
• Referred By: ASTM A484/A484M-23 - Standard Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings
• Effective Date: 01-Apr-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A638/A638M −10
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 designationA638/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* Unified Numbering System (UNS)
2
1.1 This specification covers hot-finished or cold-finished
3. Ordering Information
precipitation hardening iron base superalloy bars, forgings, and
3.1 It is the responsibility of the purchaser to specify all
forging stock for high-temperature service. The mechanical
requirements that are necessary for material ordered under this
properties of these alloys are developed by suitable solution
specification. Such requirements may include, but are not
treating and precipitation hardening treatments.
limited to, the following:
1.2 Twogradesofironbasealloyarecovered.Selectionwill
3.1.1 Quantity (weight or number of pieces),
dependupondesign,serviceconditions,mechanicalproperties,
3.1.2 Name of material (precipitation hardening iron base
and elevated temperature characteristics.
superalloy),
1.3 The values stated in either inch-pound units or SI 3.1.3 Form (bars, forgings, and forging stock),
3.1.4 Dimensions (in the case of rough or finished forgings
(metric)unitsaretoberegardedseparatelyasstandards;within
the text and tables, the SI units are shown in [brackets]. The the order shall be accompanied by a print or drawing or
otherwiseadequatelydescribedastotheshapeanddimension),
values stated in each system are not exact equivalents;
therefore, each system must be used independent of the other. 3.1.5 Grade designation (Table 1),
3.1.6 Condition (Section 5),
Combining values from the two systems may result in noncon-
formance with the specification. 3.1.7 Finish (Section 3),
3.1.8 Mechanical requirements (Section 8),
1.4 Unless the order specifies an “M” designation, the
3.1.9 ASTM designation, and
material shall be furnished to inch-pound units.
3.1.10 Special requirements.
2. Referenced Documents
4. General Requirements
3
2.1 ASTM Standards:
4.1 In addition to the requirements of this specification, all
A484/A484M Specification for General Requirements for
requirements of the current edition of Specification A484/
Stainless Steel Bars, Billets, and Forgings
A484M shall apply. Failure to comply with the general
A751 Test Methods, Practices, and Terminology for Chemi-
requirements of Specification A484/A484M constitutes non-
cal Analysis of Steel Products
conformance with this specification.
E30 Test Methods for ChemicalAnalysis of Steel, Cast Iron,
4
5. Condition
Open-Hearth Iron, and Wrought Iron (Withdrawn 1995)
E527 Practice for Numbering Metals and Alloys in the
5.1 The product forms covered in this specification may be
furnished in one of the following conditions:
5.1.1 Hot-finished,
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
5.1.2 Solution treated (Grade 660 only—Type 1 or Type 2
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
solution treatment as specified),
A01.17 on Flat-Rolled and Wrought Stainless Steel.
5.1.3 Solution and precipitation treated (Grade 660 only—
Current edition approved April 1, 2010. Published April 2010. Originally
approved in 1970. Last previous edition approved in 2004 as A638/A638M – 00
Type 1 or Type 2 solution treatment as specified), or
(2004). DOI: 10.1520/A0638_A0638M-10.
5.1.4 Other as specified.
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-638 in Section II of that Code.
6. Heat Treatment
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1 Samples cut from bars, forgings, or a sample forged
Standards volume information, refer to the standard’s Document Summary page on
from the forging stock shall conform to the mechanical
the ASTM website.
4
properties of Table 1 and Table 2 when heat treated as
The last approved version of this historical standard is referenced on
www.astm.org. prescribed in Table 3.
*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 − 10
TABLE 1 Mechanical Property Requirements
A
Grade 660 Grade 662 (bars) Grade 662 (forgings)
B
Heat treatment solution + precipitation solution + precipitation solution + precipitation
harden harden harden
Tensile
...

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–00 (Reapproved 2004) Designation: A638/A638M – 10
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 designationA638/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 inch-pound units or SI (metric) units are to be regarded separately as standards; within the text
and tables, the SI units are shown in [brackets]. The values stated in each system are not exact equivalents; therefore, each system
must be used independent of the other. Combining values from the two systems may result in nonconformance with the
specification.
1.4 Unless the order specifies an “M” designation, the material shall be furnished to inch-pound units.
2. Referenced Documents
3
2.1 ASTM Standards:
A484/A484M Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
4
E30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
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.
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys,Alloys and is the direct responsibility of Subcommittee
A01.17 on Flat-Rolled and Wrought Stainless Steel.
Current edition approved Sept. 1, 2004. Published September 2004. Originally approved in 1970. Last previous edition approved in 2000 as A638/A638M–00. DOI:
10.1520/A0638_A0638M-00R04.
Current edition approved April 1, 2010. Published April 2010. Originally approved in 1970. Last previous edition approved in 2004 as A638/A638M – 00 (2004). DOI:
10.1520/A0638_A0638M-10.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-638 in Section II of that Code.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
Withdrawn.
4
Withdrawn. The last approved version of this historical standard is referenced on www.astm.org.
*ASummary 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 – 10
TABLE 1 Mechanical Property Requirements
A
Grade 660 Grade 662 (bars) Grade 662 (forgings)
B
Heat treatment solution + precipitation solution + precipitation solution + precipitation
harden harden harden
Tensile strength, min:
psi 130 000 130 000 125 000
[MPa] [895] [895] [860]
Yield strength (0.2 % offset), min:
psi 85 000 85 000 80 000
[MPa] [585] [585] [550]
Elongation in 4D min, % 15 15 15
Reduction of area min, % 18 18 18
Brinell hardness 248 min 248 min 248 min
A 2 2
The elongation of tensile specimens machined tang
...

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–00 (Reapproved 2004) Designation: A638/A638M – 10
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 designationA638/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 inch-pound units or SI (metric) units are to be regarded separately as standards; within the text
and tables, the SI units are shown in [brackets]. The values stated in each system are not exact equivalents; therefore, each system
must be used independent of the other. Combining values from the two systems may result in nonconformance with the
specification.
1.4 Unless the order specifies an “M” designation, the material shall be furnished to inch-pound units.
2. Referenced Documents
3
2.1 ASTM Standards:
A484/A484M Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
4
E30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
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.
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys,Alloys and is the direct responsibility of Subcommittee
A01.17 on Flat-Rolled and Wrought Stainless Steel.
Current edition approved Sept. 1, 2004. Published September 2004. Originally approved in 1970. Last previous edition approved in 2000 as A638/A638M–00. DOI:
10.1520/A0638_A0638M-00R04.
Current edition approved April 1, 2010. Published April 2010. Originally approved in 1970. Last previous edition approved in 2004 as A638/A638M – 00 (2004). DOI:
10.1520/A0638_A0638M-10.
2
For ASME Boiler and Pressure Vessel Code applications see related Specification SA-638 in Section II of that Code.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
Withdrawn.
4
Withdrawn. The last approved version of this historical standard is referenced on www.astm.org.
*ASummary 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 – 10
TABLE 1 Mechanical Property Requirements
A
Grade 660 Grade 662 (bars) Grade 662 (forgings)
B
Heat treatment solution + precipitation solution + precipitation solution + precipitation
harden harden harden
Tensile strength, min:
psi 130 000 130 000 125 000
[MPa] [895] [895] [860]
Yield strength (0.2 % offset), min:
psi 85 000 85 000 80 000
[MPa] [585] [585] [550]
Elongation in 4D min, % 15 15 15
Reduction of area min, % 18 18 18
Brinell hardness 248 min 248 min 248 min
A 2 2
The elongation of tensile specimens machined tang
...