Norma Astm

Designation: A897/A897M − 06 (Reapproved 2011)

Standard Specification for

Austempered Ductile Iron Castings1
This standard is issued under the fixed designation A897/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.
Asuperscript epsilon (´) 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 relationshipcan 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 treatmentsmay be performed by different 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 SI units or inch-pound units
are to be regarded separately as standard. The values stated in
each system may not be exactequivalents; therefore, each
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
with the standard.
1.5.1 Exception—Within the text, the SI units are shown in
brackets.
2. Referenced Documents
2.1 ASTM Standards:2
A247 Test Method for Evaluating the Microstructure of
Graphite in Iron Castings

A370 Test Methods and Definitionsfor Mechanical Testing
of Steel Products
A732/A732M Specification for Castings, Investment, Carbon and Low Alloy Steel for General Application, and
Cobalt Alloy for High Strength at Elevated Temperatures
A834 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 ofMetallic Materials
E23 Test Methods for Notched Bar Impact Testing of Metallic Materials
2.2 Military Standard:
MIL-STD-129 Military Marking for Shipment and Storage3
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 6and 7),
3.1.3 Chemical composition requirements, if any (see Section 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, orsurface finish (see Section 9),
3.1.8 Certification, if required (see Section 16),
3.1.9 Special preparation for delivery, if required (see Section 17).
4. Chemical Composition

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 Nov.1, 2011. Published April 2012. Originally
approved in 1990. Last previous edition approved in 2006 as A897/A897M - 06.
DOI: 10.1520/A0897_A0897M-06R11.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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Standards volume information, refer to the standard’s Document Summary page on
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