ASTM A897/A897M-06(2011)

Standard Specification for Austempered Ductile Iron Castings

ABSTRACT
This specification covers ductile iron castings that are subsequently heat treated by an austempering process. The chemical composition requirements may be agreed upon between the manufacturer, heat treater, and the purchaser. Requirements for the microstructure constituents such as graphite, ausferrite (acicular ferrite and high carbon, stable austenite), pearlite, and martensite are prescribed. The iron shall conform to the mechanical property requirements including tensile strength, yield strength, elongation, impact energy, and Brinell hardness. Castings shall be heat treated by an austempering process detailed in this specification. The standard specimens for tension and Charpy impact tests are illustrated.
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 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 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 exact equivalents; 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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2011
• 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-06 - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 01-Nov-2011
• Replaced By: ASTM A897/A897M-15 - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 01-May-2015
• Referred By: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 01-Nov-2011
• Referred By: ASTM A1095-15(2019) - Standard Specification for High-Silicon Molybdenum Ferritic Iron Castings
• Effective Date: 01-Nov-2011

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: A897/A897M −06(Reapproved 2011)
Standard Specification for
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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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
1.1 This specification covers ductile iron castings that are
A732/A732M Specification for Castings, Investment, Car-
subsequently heat treated by an austempering process as
bon and Low Alloy Steel for General Application, and
defined in 10.1.
Cobalt Alloy for High Strength at Elevated Temperatures
1.2 The application of the austempering heat treatment
A834 Specification for Common Requirements for Iron
extends the range of properties achievable in ductile iron
Castings for General Industrial Use
castings.
E8 Test Methods for Tension Testing of Metallic Materials
1.3 No precise quantitative relationship can be stated be- E10 Test Method for Brinell Hardness of Metallic Materials
E23 Test Methods for Notched Bar Impact Testing of Me-
tweenthepropertiesoftheironinvariouslocationsofthesame
casting or between the properties of castings and those of a test tallic Materials
specimen cast from the same iron (see Appendix X1).
2.2 Military Standard:
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However, austempering heat treatment will tend to diminish
MIL-STD-129 Military Marking for Shipment and Storage
any differences in mechanical properties.
1.4 The production of castings, machining (if required), and 3. Ordering Information
the austempering heat treatments may be performed by differ-
3.1 Orders for material to this specification shall include the
ent manufacturers, as covered in Section 15. The purchaser
following information:
should establish by contract agreement, at the time of ordering,
3.1.1 ASTM designation, with year of issue,
the responsibility of the various parties for meeting the
3.1.2 Grade of austempered ductile iron required (see Table
specification requirements.
1 and Sections 6 and 7),
1.5 The values stated in either SI units or inch-pound units
3.1.3 Chemical composition requirements, if any (see Sec-
are to be regarded separately as standard. The values stated in
tion 4),
each system may not be exact equivalents; therefore, each
3.1.4 Heat treated microstructure restrictions (see Section
system shall be used independently of the other. Combining
10),
values from the two systems may result in non-conformance
3.1.5 Test coupon criteria (see Section 12),
with the standard.
3.1.6 Lot size and tests per lot (see 12.6 and Section 15),
1.5.1 Exception—Within the text, the SI units are shown in
3.1.7 Special requirements, if desired, including hardness,
brackets.
radiographic soundness, magnetic particle inspection, pressure
tightness, dimensions, or surface finish (see Section 9),
2. Referenced Documents
2
3.1.8 Certification, if required (see Section 16),
2.1 ASTM Standards:
3.1.9 Special preparation for delivery, if required (see Sec-
A247 Test Method for Evaluating the Microstructure of
tion 17).
Graphite in Iron Castings
4. Chemical Composition
1
This specification is under the jurisdiction of ASTM Committee A04 on Iron
4.1 Although this specification has no specific chemical
Castings and is the direct responsibility of Subcommittee A04.02 on Malleable and
requirements, such requirements may be agreed upon between
Ductile Iron Castings.
the manufacturer, heat treater, and the purchaser.
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
3
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Standards volume information, refer to the standard’s Document Summary page on Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
the ASTM website. dodssp.daps.dla.mil.
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A897/A897M − 06 (2011)
TABLE 1 Mechanical Property Requirements of Grades
Inch-pound units Grade Grade Grade Grade Grade Grade
110/70/11 130/90/09 150/110/07 175/125/04 200/155/02 230/185/01
Tensile strength, min, ksi 110 130 150 175 200 230
Yield strength, min, ksi 70 90 110 125 155 185
Elongation in 2 in., min, % 11 9 7 4 2 1
A
Impact energy, ft-lb 80 75 60 45 25 15
2B
Typical hardness, HBW, kg/mm 241–302 269–341
...