ASTM A897/A897M-22

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 9.1.  
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 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 nonconformance with the standard.  
1.5.1 Exception—Within the text, the SI units are shown in brackets.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Sep-2022
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.02 - Malleable and Ductile Iron Castings

Relations

• Refers: ASTM A732/A732M-20 - Standard Specification for Castings, Investment, Carbon and Low-Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
• Effective Date: 01-May-2020
• Refers: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 01-May-2020

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A897/A897M −22
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This specification covers ductile iron castings that are
A247 Test Method for Evaluating the Microstructure of
subsequently heat treated by an austempering process as
Graphite in Iron Castings
defined in 9.1.
A370 Test Methods and Definitions for Mechanical Testing
1.2 The application of the austempering heat treatment
of Steel Products
extends the range of properties achievable in ductile iron
A732/A732M Specification for Castings, Investment, Car-
castings.
bon and Low-Alloy Steel for General Application, and
Cobalt Alloy for High Strength at Elevated Temperatures
1.3 No precise quantitative relationship can be stated be-
A834 Specification for Common Requirements for Iron
tweenthepropertiesoftheironinvariouslocationsofthesame
Castings for General Industrial Use
casting or between the properties of castings and those of a test
E8/E8M Test Methods for Tension Testing of Metallic Ma-
specimen cast from the same iron (see Appendix X1).
terials
However, austempering heat treatment will tend to diminish
E10 Test Method for Brinell Hardness of Metallic Materials
any differences in mechanical properties.
E23 Test Methods for Notched Bar Impact Testing of Me-
tallic Materials
1.4 The production of castings, machining (if required), and
3
the austempering heat treatments may be performed by differ-
2.2 Military Standard:
ent manufacturers, as covered in Section 13. The purchaser MIL-STD-129 Military Marking for Shipment and Storage
should establish by contract agreement, at the time of ordering,
3. Ordering Information
the responsibility of the various parties for meeting the
specification requirements.
3.1 Orders for material to this specification shall include the
following information:
1.5 The values stated in either SI units or inch-pound units
3.1.1 ASTM designation, with year of issue.
are to be regarded separately as standard. The values stated in
3.1.2 Grade of austempered ductile iron required (see Table
each system may not be exact equivalents; therefore, each
1 or Table 2 and Section 6).
system shall be used independently of the other. Combining
3.1.3 Chemical composition requirements, if any (see Sec-
values from the two systems may result in nonconformance
tion 4).
with the standard.
3.1.4 Deviations to tensile strength and elongation with
1.5.1 Exception—Within the text, the SI units are shown in
increasing section thickness (see 6.4).
brackets.
3.1.5 Heat-treated microstructure restrictions (see Section
9).
1.6 This international standard was developed in accor-
3.1.6 Test coupon criteria (see Section 11).
dance with internationally recognized principles on standard-
3.1.7 Lot size and tests per lot (see 11.6 and Section 13).
ization established in the Decision on Principles for the
3.1.8 Special requirements, if desired, including hardness,
Development of International Standards, Guides and Recom-
radiographic soundness, magnetic particle inspection, pressure
mendations issued by the World Trade Organization Technical
tightness, dimensions, or surface finish (see Section 8).
Barriers to Trade (TBT) Committee.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This specification is under the jurisdiction of ASTM Committee A04 on Iron contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Castings and is the direct responsibility of Subcommittee A04.02 on Malleable and Standards volume information, refer to the standard’s Document Summary page on
Ductile Iron Castings. the ASTM website.
3
Current edition approved Oct. 1, 2022. Published October 2022. Originally Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
approved in 1990. Last previous edition approved in 2016 as A897/A897M – 16. Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
DOI: 10.1520/A0897_A0897M-22. dodssp.daps.dla.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A897/A897M − 22
TABLE 1 Mechanical Property Requirements of Grades 1–5
Grade 1 Grade 2 Grade 3 Grade 4 Grade 5
Inch-pound units
130/90/09 150/110/07 175/125/
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A897/A897M − 16 A897/A897M − 22
Standard Specification for
1
Austempered Ductile Iron Castings
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.
A superscript 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 9.1.
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 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-conformancenonconformance with the standard.
1.5.1 Exception—Within the text, the SI units are shown in brackets.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A247 Test Method for Evaluating the Microstructure of Graphite in Iron Castings
A370 Test Methods and Definitions for 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
E8E8/E8M Test Methods for Tension Testing of Metallic Materials [Metric] E0008_E0008M
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 Aug. 1, 2016Oct. 1, 2022. Published August 2016October 2022. Originally approved in 1990. Last previous edition approved in 20152016 as
A897/A897M – 15.A897/A897M – 16. DOI: 10.1520/A0897_A0897M-16.10.1520/A0897_A0897M-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A897/A897M − 22
E10 Test Method for Brinell Hardness of Metallic Materials
E23 Test Methods for Notched Bar Impact Testing of Metallic Materials
3
2.2 Military Standard:
MIL-STD-129 Military Marking for Shipment and Storage
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,issue.
3.1.2 Grade of austempered ductile iron required (see Table 1 or Table 2 and Section 6),).
3.1.3 Chemical composition requirements, if any (see Section 4),).
3.1.4 Deviations to tensile strength and elongation with increasing section thickness (see 6.4).
3.1.5 Heat treated Heat-treated microstructure restrictions (see Section 9),).
3.1.6 Test coupon criteria (see Section 11),).
3.1.7 Lot size and tests per lot (see 11.6 and Section 13),).
3.1.8 Special requirements, if desired, including hardness, radiographic soundness, magnetic particle inspection, pressure
tightness, dimensions, or surface finish (see Section 8),).
3.1.9 Certification, if require
...