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ASTM A897.pdf
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ASTM A897.pdf
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Designation: A 897/A 897M – 06
Standard Specification for
Austempered Ductile Iron Castings
1
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
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 be-
tween 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). How-
ever, 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 differ-
ent manufacturers, as covered in Section
15. 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.
2. Referenced Documents
2.1 ASTM Standards:
2
A 247 Test Method for Evaluating the Microstructure of
Graphite in Iron Castings
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 732/A 732M Specification for Castings, Investment, Car-
bon and Low Alloy Steel for General Application, and
Cobalt Alloy for High Strength at Elevated Temperatures
A 834 Specification for Common Requirements for Iron
Castings for General Industrial Use
E8 Test Methods for Tension Testing of Metallic Materials
E10 Test Method for Brinell Hardness of Metallic Materi-
als
E23 Test Methods for Notched Bar Impact Testing of
Metallic Materials
2.2 Military Standard:
MIL-STD-129 Military Marking for Shipment and Storage
3
3. Ordering Information
3.1 Orders for material to this specification shall include the
following information:
3.1.1 ASTM designation, with year of issue,
3.1.2 Grade of austempered ductile iron required (see
Table
1 and Sections 6 and 7),
3.1.3 Chemical composition requirements, if any (see Sec-
tion
4),
3.1.4 Heat treated microstructure restrictions (see Section
10),
3.1.5 Test coupon criteria (see Section
12),
3.1.6 Lot size and tests per lot (see
12.6 and Section 15),
3.1.7 Special requirements, if desired, including hardness,
radiographic soundness, magnetic particle inspection, pressure
tightness, dimensions, or surface finish (see Section
9),
3.1.8 Certification, if required (see Section
16),
3.1.9 Special preparation for delivery, if required (see Sec-
tion
17).
4. Chemical Composition
4.1 Although this specification has no specific chemical
requirements, such requirements may be agreed upon between
the manufacturer, heat treater, and the purchaser.
1
This specification is under the jurisdiction of ASTM Committee A04 on Iron
Castings and is the direct responsibility of Subcommittee A04.02 on Malleable and
Ductile Iron Castings.
Current edition approved Feb. 1, 2006. Published February 2006. Originally
approved in 1990. Last previous edition approved in 2003 as A 897/A 897M - 03.
2
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.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.
1
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
Copyright by ASTM Int'l (all rights reserved);
Reproduction authorized per License Agreement with Monique Tyree (ASTMIHS Account); Mon Feb 27 12:18:54 EST 2006
Copyright ASTM International
Provided by IHS under license with ASTM
Not for Resale
No reproduction or networking permitted without license from IHS
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