ASTM A638/A638M-00(2004)
(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 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
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 – 00 (Reapproved 2004)
Standard Specification for
Precipitation Hardening Iron Base Superalloy Bars,
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 3. Ordering Information
1.1 This specification covers hot-finished or cold-finished 3.1 It is the responsibility of the purchaser to specify all
precipitation hardening iron base superalloy bars, forgings, and requirements that are necessary for material ordered under this
forging stock for high-temperature service. The mechanical specification. Such requirements may include, but are not
properties of these alloys are developed by suitable solution limited to, the following:
treating and precipitation hardening treatments. 3.1.1 Quantity (weight or number of pieces),
1.2 Twogradesofironbasealloyarecovered.Selectionwill 3.1.2 Name of material (precipitation hardening iron base
dependupondesign,serviceconditions,mechanicalproperties, superalloy),
and elevated temperature characteristics. 3.1.3 Form (bars, forgings, and forging stock),
1.3 The values stated in either inch-pound units or SI 3.1.4 Dimensions (in the case of rough or finished forgings
(metric)unitsaretoberegardedseparatelyasstandards;within the order shall be accompanied by a print or drawing or
the text and tables, the SI units are shown in [brackets]. The otherwiseadequatelydescribedastotheshapeanddimension),
values stated in each system are not exact equivalents; there- 3.1.5 Grade designation (Table 1),
fore, each system must be used independent of the other. 3.1.6 Condition (Section 5),
Combining values from the two systems may result in noncon- 3.1.7 Finish (Section 3),
formance with the specification. 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
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, andTerminology for Chemi- requirements of Specification A484/A484M constitutes non-
cal Analysis of Steel Products conformance with this specification.
E30 Test Methods for Chemical Analysis of Steel, Cast
4 5. Condition
Iron, Open-Hearth Iron, and Wrought Iron
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:
Unified Numbering System (UNS)
5.1.1 Hot-finished,
5.1.2 Solution treated (Grade 660 only—Type 1 or Type 2
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
solution treatment as specified),
Stainless Steel and RelatedAlloys, and is the direct responsibility of Subcommittee
5.1.3 Solution and precipitation treated (Grade 660 only—
A01.17 on Flat-Rolled and Wrought Stainless Steel.
Current edition approved Sept. 1, 2004. Published September 2004. Originally
Type 1 or Type 2 solution treatment as specified), or
approved in 1970. Last previous edition approved in 2000 as A638/A638M – 00.
5.1.4 Other as specified.
DOI: 10.1520/A0638_A0638M-00R04.
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
6. Heat Treatment
cation SA-638 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Samples cut from bars, forgings, or a sample forged
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
from the forging stock shall conform to the mechanical
Standards volume information, refer to the standard’s Document Summary page on
properties of Table 1 and Table 2 when heat treated as
the ASTM website.
Withdrawn. prescribed in Table 3.
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A638/A638M – 00 (2004)
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 tangentially from near the center of large disk forgings over 50 in. [320 cm ] in cross section may be as low as 10 %.
The reduction of area may be as low as 12 %.
B
Refer to Table 3 of heat treatment.
TABLE 2 Stress-Rupture Requirements
A
Grade Heat Treatment Test Temperature Stress Minimum Minimum
B
Hours Elongation, %
°F [°C] psi [MPa]
660 solution + precipitation harden 1200 [650] 65 000 [450] 23 3
662 solution +
...
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