ASTM A638/A638M-00

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

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: 09-Mar-2000
• 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

• Replaced By: 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-Sep-2004
• Referred By: ASTM A484/A484M-23 - Standard Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings
• Effective Date: 10-Mar-2000

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A 638/A 638M – 00
Standard Specification for
Precipitation Hardening Iron Base Superalloy Bars,
Forgings, and Forging Stock for High-Temperature Service
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 specification. Such requirements may include, but are not
2 limited to, the following:
1.1 This specification covers hot-finished or cold-finished
3.1.1 Quantity (weight or number of pieces),
precipitation hardening iron base superalloy bars, forgings, and
3.1.2 Name of material (precipitation hardening iron base
forging stock for high-temperature service. The mechanical
superalloy),
properties of these alloys are developed by suitable solution
3.1.3 Form (bars, forgings, and forging stock),
treating and precipitation hardening treatments.
3.1.4 Dimensions (in the case of rough or finished forgings
1.2 Two grades of iron base alloy are covered. Selection will
the order shall be accompanied by a print or drawing or
depend upon design, service conditions, mechanical properties,
otherwise adequately described as to the shape and dimension),
and elevated temperature characteristics.
3.1.5 Grade designation (Table 1),
1.3 The values stated in either inch-pound units or SI
3.1.6 Condition (Section 5),
(metric) units are to be regarded separately as standards; within
3.1.7 Finish (Section 3),
the text and tables, the SI units are shown in [brackets]. The
3.1.8 Mechanical requirements (Section 8),
values stated in each system are not exact equivalents; there-
3.1.9 ASTM designation, and
fore, each system must be used independent of the other.
3.1.10 Special requirements.
Combining values from the two systems may result in noncon-
formance with the specification.
4. General Requirements
1.4 Unless the order specifies an “M” designation, the
4.1 In addition to the requirements of this specification, all
material shall be furnished to inch-pound units.
requirements of the current edition of Specification A 484/
2. Referenced Documents A 484M shall apply. Failure to comply with the general
requirements of Specification A 484/A 484M constitutes non-
2.1 ASTM Standards:
conformance with this specification.
A 484/A484M Specification for General Requirements for
Stainless Steel Bars, Billets and Forgings
5. Condition
A 751 Test Methods, Practices, and Terminology for
4 5.1 The product forms covered in this specification may be
Chemical Analysis of Steel Products
furnished in one of the following conditions:
E 30 Test Methods for Chemical Analysis of Steel, Cast
5 5.1.1 Hot-finished,
Iron, Open-Hearth Iron, and Wrought Iron
5.1.2 Solution treated (Grade 660 only—Type 1 or Type 2
3. Ordering Information solution treatment as specified),
5.1.3 Solution and precipitation treated (Grade 660 only—
3.1 It is the responsibility of the purchaser to specify all
Type 1 or Type 2 solution treatment as specified), or
requirements that are necessary for material ordered under this
5.1.4 Other as specified.
1 6. Heat Treatment
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
Stainless Steel and Related Alloys, and is the direct responsibility of Subcommittee
6.1 Samples cut from bars, forgings, or a sample forged
A01.17 on Flat Stainless Steel Products.
from the forging stock shall conform to the mechanical
Current edition approved March 10, 2000. Published May 2000. Originally
properties of Table 1 and Table 2 when heat treated as
published as A 638 – 70. Last previous edition A 638/A 638M – 95.
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
prescribed in Table 3.
cation SA-638 in Section II of that Code.
Annual Book of ASTM Standards, Vol 01.05.
Annual Book of ASTM Standards, Vol 01.03.
Annual Book of ASTM Standards, Vol 03.05.
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A 638/A 638M – 00
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 2 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 + precipitation harden 1200 [650] 60 000 [415] 15 3
A
Refer to Table 2 for details of heat treatment.
B
Test specimens meeting minimum requirem
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