ASTM A897/A897M-03

Standard Specification for Austempered Ductile Iron Castings

SCOPE
1.1 This specification covers ductile iron castings that are subsequently heat treated by an austempering process as defined in 10.1.
1.2 The application of the austempering heat treatment extends the range of properties achievable in ductile iron castings.
1.3 No precise quantitative relationship can be stated between the properties of the iron in various locations of the same casting or between the properties of castings and those of a test specimen cast from the same iron (see ). However, austempering heat treatment will tend to diminish any differences in mechanical properties.
1.4 The production of castings, machining (if required), and the austempering heat treatments may be performed by different manufacturers, as covered in Section . The purchaser should establish by contract agreement, at the time of ordering, the responsibility of the various parties for meeting the specification requirements.
1.5 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets [ ]. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 30-Nov-2003
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.02 - Malleable and Ductile Iron Castings

Relations

• Replaces: ASTM A897/A897M-02 - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 01-Dec-2003
• Replaced By: ASTM A897/A897M-06 - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 01-Feb-2006
• Referred By: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 01-Dec-2003
• Referred By: ASTM A1095-15(2019) - Standard Specification for High-Silicon Molybdenum Ferritic Iron Castings
• Effective Date: 01-Dec-2003

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 897/A 897M – 03
Standard Specification for
1
Austempered Ductile Iron Castings
This standard is issued under the fixed designationA897/A897M; 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 for High Strength at Elevated Temperatures
A 834 Specification for Common Requirements for Iron
1.1 This specification covers ductile iron castings that are
Castings for General Industrial Use
subsequently heat treated by an austempering process as
E 8 Test Methods for Tension Testing of Metallic Materials
defined in 10.1.
E 10 Test Methods for Brinell Hardness of Metallic Mate-
1.2 The application of the austempering heat treatment
rials
extends the range of properties achievable in ductile iron
E 23 Test Methods for Notched Bar Impact Testing of
castings.
Metallic Materials
1.3 No precise quantitative relationship can be stated be-
2.2 Military Standard:
tweenthepropertiesoftheironinvariouslocationsofthesame
3
MIL-STD-129 Marking for Shipment and Storage
casting or between the properties of castings and those of a test
specimen cast from the same iron (see Appendix X1). How-
3. Ordering Information
ever, austempering heat treatment will tend to diminish any
3.1 Orders for material to this specification shall include the
differences in mechanical properties.
following information:
1.4 The production of castings, machining (if required), and
3.1.1 ASTM designation, with year of issue,
the austempering heat treatments may be performed by differ-
3.1.2 Grade of austempered ductile iron required (see Table
ent manufacturers, as covered in Section 15. The purchaser
1 and Sections 6 and 7),
should establish by contract agreement, at the time of ordering,
3.1.3 Chemical composition requirements, if any (see Sec-
the responsibility of the various parties for meeting the
tion 4),
specification requirements.
3.1.4 Heat treated microstructure restrictions (see Section
1.5 The values stated in either inch-pound or SI units are to
10),
be regarded separately as standard.Within the text, the SI units
3.1.5 Test coupon criteria (see Section 12),
are shown in brackets [ ]. The values stated in each system are
3.1.6 Lot size and tests per lot (see 12.6 and Section 15),
not exact equivalents; therefore, each system shall be used
3.1.7 Special requirements, if desired, including hardness,
independently of the other. Combining values from the two
radiographic soundness, magnetic particle inspection, pressure
systems may result in nonconformance with the specification.
tightness, dimensions, or surface finish (see Section 9),
2. Referenced Documents 3.1.8 Certification, if required (see Section 16),
2 3.1.9 Special preparation for delivery, if required (see Sec-
2.1 ASTM Standards:
tion 17).
A 247 Test Method for Evaluating the Microstructure of
Graphite in Iron Castings
4. Chemical Composition
A 370 Test Methods and Definitions for MechanicalTesting
4.1 Although this specification has no specific chemical
of Steel Products
requirements, such requirements may be agreed upon between
A 732 Specification for Castings, Investment, Carbon and
the manufacturer, heat treater, and the purchaser.
LowAlloySteelforGeneralApplication,andCobaltAlloy
5. Microstructure
1
This specification is under the jurisdiction of ASTM Committee A04 on Iron 5.1 The graphite component of the microstructure shall
Castings and is the direct responsibility of SubcommitteeA04.02 on Malleable and
consist of a minimum 80 % spheroidal graphite conforming to
Ductile Iron Castings.
Types I and II per Test Method A 247.
Current edition approved Dec. 1, 2003. Published January 2004. Originally
approved in 1990. Last previous edition approved in 2002 as A 897 - 02.
2
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contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
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A 897/A 897M – 03
TABLE 1 Mechanical Property Requirements of Grades
Inch-pound units Grade Grade Grade Grade Grade
130/90/09 150/110/07 175/125/04 200/155/02 230/185/01
Tensile strength, min, ksi 130 150 175 200 230
Yield strength, min, ksi 90 110 125 155 185
Elongation in 2 in., min, % 9 7421
A
Impact energy, ft-lb 75 60 45 25 15
2
Typical hardness, HBW, kg
...