ASTM A897/A897M-02

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 8.1.
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 Appendix X1). 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 13. 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: 09-Feb-2002
• 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• Replaces: ASTM A897-90(1997) - Standard Specification for Austempered Ductile Iron Castings (Withdrawn)
• Effective Date: 10-Feb-2002
• Replaced By: ASTM A897/A897M-03 - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 01-Dec-2003
• Referred By: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 10-Feb-2002
• Referred By: ASTM A1095-15(2019) - Standard Specification for High-Silicon Molybdenum Ferritic Iron Castings
• Effective Date: 10-Feb-2002

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 897/A 897M – 02
Standard Specification for
1
Austempered Ductile Iron Castings
This standard is issued under the fixed designation A 897/A 897M; 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 E 23 Test Methods for Notched Bar Impact Testing of
4
Metallic Materials
1.1 This specification covers ductile iron castings that are
2.2 Military Standard:
subsequently heat treated by an austempering process as
5
MIL-STD-129 Marking for Shipment and Storage
defined in 8.1.
1.2 The application of the austempering heat treatment
3. Ordering Information
extends the range of properties achievable in ductile iron
3.1 Orders for material to this specification shall include the
castings.
following information:
1.3 No precise quantitative relationship can be stated be-
3.1.1 ASTM designation, with year of issue,
tween the properties of the iron in various locations of the same
3.1.2 Grade of austempered ductile iron required (see Table
casting or between the properties of castings and those of a test
1 and Sections 5 and 6),
specimen cast from the same iron (see Appendix X1). How-
3.1.3 Chemical composition requirements, if any (see Sec-
ever, austempering heat treatment will tend to diminish any
tion 4),
differences in mechanical properties.
3.1.4 Heat treated microstructure restrictions (see Section
1.4 The production of castings, machining (if required), and
8),
the austempering heat treatments may be performed by differ-
3.1.5 Test coupon criteria (see Section 10),
ent manufacturers, as covered in Section 13. The purchaser
3.1.6 Lot size and tests per lot (see 10.6 and Section 13),
should establish by contract agreement, at the time of ordering,
3.1.7 Special requirements, if desired, including hardness,
the responsibility of the various parties for meeting the
radiographic soundness, magnetic particle inspection, pressure
specification requirements.
tightness, dimensions, or surface finish (see Section 7),
1.5 The values stated in either inch-pound or SI units are to
3.1.8 Certification, if required (see Section 14),
be regarded separately as standard. Within the text, the SI units
3.1.9 Special preparation for delivery, if required (see Sec-
are shown in brackets. The values stated in each system are not
tion 15).
exact equivalents; therefore, each system shall be used inde-
pendently of the other. Combining values from the two systems
4. Chemical Composition
may result in nonconformance with the specification.
4.1 Although this specification has no specific chemical
requirements, such requirements may be agreed upon between
2. Referenced Documents
the manufacturer and the purchaser.
2.1 ASTM Standards:
A 370 Test Methods and Definitions for Mechanical Testing
5. Mechanical Properties
2
of Steel Products
5.1 Tensile property requirements include tensile strength,
A 732 Specification for Castings, Investment, Carbon and
yield strength, and elongation and apply only after austemper-
Low Alloy Steel for General Application, and Cobalt Alloy
3 ing heat treatment.
for High Strength at Elevated Temperatures
5.2 The iron represented by the test specimens shall con-
A 834 Specification for Common Requirements for Iron
3 form to the requirements as presented in Table 1.
Castings for General Industrial Use
4 5.3 The yield strength shall be determined by the 0.2 %
E 8 Test Methods for Tension Testing of Metallic Materials
offset method (see Test Methods E 8).
6. Impact Requirements
1
This specification is under the jurisdiction of ASTM Committee A04 on Iron
6.1 The iron represented by the test specimens shall con-
Castings and is the direct responsibility of Subcommittee A04.02 on Malleable and
form to the impact properties presented in Table 1.
Ductile Iron Castings.
Current edition approved Feb. 10, 2002. Published April 2002. Originally
published as A 897 - 90. Last previous edition A 897 - 90 (1997).
2
Annual Book of ASTM Standards, Vol 01.03.
3 5
Annual Book of ASTM Standards, Vol 01.02. Available from Standardization Documents, Order Desk, Building 4, Section D,
4
Annual Book of ASTM Standards, Vol 03.01. 700 Robbins Ave., Philadelphia, PA 19111-5098, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 897/A 897M – 02
TABLE 1 Mechanical Property Requirements of Grades
Grade Grade Grade Grade Grad
...