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ASTM A638.pdf
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ASTM A638.pdf
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Designation: A 638/A 638M – 00 (Reapproved 2004)
Standard Specification for
Precipitation Hardening Iron Base Superalloy Bars,
Forgings, and Forging Stock for High-Temperature Service
1
This standard is issued under the fixed designation A 638/A 638M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification
2
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; there-
fore, each system must be used independent of the other.
Combining values from the two systems may result in noncon-
formance with the specification.
1.4 Unless the order specifies an “M” designation, the
material shall be furnished to inch-pound units.
2. Referenced Documents
2.1 ASTM Standards:
3
A 484/A 484M Specification for General Requirements for
Stainless Steel Bars, Billets and Forgings
A 751 Test Methods, Practices, and Terminology for
Chemical Analysis of Steel Products
E 30 Test Methods for Chemical Analysis of Steel, Cast
Iron, Open-Hearth Iron, and Wrought Iron
4
E 527 Practice for Numbering Metals and Alloys (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.
4. General Requirements
4.1 In addition to the requirements of this specification, all
requirements of the current edition of Specification A 484/
A 484M shall apply. Failure to comply with the general
requirements of Specification A 484/A 484M constitutes non-
conformance with this specification.
5. Condition
5.1 The product forms covered in this specification may be
furnished in one of the following conditions:
5.1.1 Hot-finished,
5.1.2 Solution treated (Grade 660 only—Type 1 or Type 2
solution treatment as specified),
5.1.3 Solution and precipitation treated (Grade 660 only—
Type 1 or Type 2 solution treatment as specified), or
5.1.4 Other as specified.
6. Heat Treatment
6.1 Samples cut from bars, forgings, or a sample forged
from the forging stock shall conform to the mechanical
properties of Table 1 and Table 2 when heat treated as
prescribed in Table 3.
6.2 When a sample cut from the forging stock and heat
treated as prescribed in Table 2 conforms to the properties in
Tables 3 and 4, it shall be accepted as equivalent to a forged
coupon.
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 Sept. 1, 2004. Published September 2004. Originally
approved in 1970. Last previous edition approved in 2000 as A 638/A 638M – 00.
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SA-638 in Section II of that Code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
4
Withdrawn.
1
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
Copyright ASTM International
Reproduced by IHS under license with ASTM
Not for Resale
No reproduction or networking permitted without license from IHS
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