ASTM A842-11
(Specification)Standard Specification for Compacted Graphite Iron Castings
Standard Specification for Compacted Graphite Iron Castings
ABSTRACT
This specification deals with compacted graphite iron castings. These materials shall be examined metallographically for the acceptance graphite formation. The acceptable graphite formation in the microstructure of the test coupon or casting lug shall contain 80% minimum Type IV graphite. The iron shall conform to the requirements for tensile properties: tensile strength, yield strength, and elongation. Test bars and test coupons shall be cast in dried, baked, or chemically bonded molds consisting of an aggregate of silica sand with appropriate bonders and shall be subjected to the same thermal treatment as the castings they represent.
SCOPE
1.1 This specification covers castings made of compacted graphite iron, which is described as cast iron with the graphite in compacted (vermiform) shapes and essentially free of flake graphite.
1.2 No precise quantitative relationship can be stated between the properties of iron in the various locations of the same casting and those of a test bar cast from the same iron (see Appendix X1).
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exception—The inch-pound units in Figs. 1-3 and 5 are standard. SI units are added for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A842 – 11
Standard Specification for
1
Compacted Graphite Iron Castings
This standard is issued under the fixed designation A842; 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 MIL-STD-129 Marking for Shipment and Storage
1.1 This specification covers castings made of compacted
3. Ordering Information
graphite iron, which is described as cast iron with the graphite
3.1 Orders for material to this specification shall include the
in compacted (vermiform) shapes and essentially free of flake
following information:
graphite.
3.1.1 ASTM designation and year of issue,
1.2 No precise quantitative relationship can be stated be-
3.1.2 Grade of compacted graphite iron required as identi-
tweenthepropertiesofironinthevariouslocationsofthesame
fied in Table 1,
casting and those of a test bar cast from the same iron (see
3.1.3 Special properties if required, (see 4.1 and 10.1),
Appendix X1).
3.1.4 If samples other than those identified in Section 9 are
1.3 The values stated in SI units are to be regarded as
required,
standard. No other units of measurement are included in this
3.1.5 Certification if so designated by the purchaser, and
standard.
3.1.6 Special preparation for delivery if required.
1.3.1 Exception—The inch-pound units in Figs. 1-3 and 5
are standard. SI units are added for information only.
4. Chemical Composition
1.4 This standard does not purport to address all of the
4.1 It is the intent of this specification to subordinate
safety concerns, if any, associated with its use. It is the
chemical composition to mechanical properties; however, any
responsibility of the user of this standard to establish appro-
chemical requirement may be specified by agreement between
priate safety and health practices and determine the applica-
the manufacturer and the purchaser.
bility of regulatory limitations prior to use.
5. Requirements
2. Referenced Documents
5.1 Compacted graphite cast iron shall be examined metal-
2
2.1 ASTM Standards:
lographically for the acceptable graphite formation.
A247 Test Method for Evaluating the Microstructure of
5.2 Themetallographicexaminationshallbeperformedona
Graphite in Iron Castings
casting, a separately cast test coupon, as shown in Fig. 1 or on
E8/E8M Test Methods for Tension Testing of Metallic
a test lug from a casting. The test coupon or casting lug shall
Materials
3 represent the last metal from the treated batch. The casting lug
2.2 Federal Standard:
dimension and location will be agreed on by manufacturer and
Federal Standard No. 123 Marking for Shipment (Civil
purchaser.
Agencies)
5.3 When castings are produced to this specification by
4
2.3 American National Standard:
treating the iron in the mold for graphite form control, the
manufacturer may use separately cast test coupons or cut test
1
This specification is under the jurisdiction of ASTM Committee A04 on Iron specimens from castings to qualify conformance of the micro-
Castings and is the direct responsibility of SubcommitteeA04.02 on Malleable and
structure requirements. When separately cast test coupons are
Ductile Iron Castings.
used, the test coupons shall have a chemical composition
Current edition approved Feb. 1, 2011. Published March 2011. Originally
representative of that in the castings, produced from that iron
approved in 1985. Last previous edition approved in 2010 as A842 - 10. DOI:
10.1520/A0842-11.
poured, and having a cooling rate equivalent to that obtained
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
through use of test molds as shown in Figs. 1-3.The size of the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cast coupon representing the castings shall be the option of the
Standards volume information, refer to the standard’s Document Summary page on
purchaser. In case no option is expressed, the manufacturer
the ASTM website.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
shall make the choice. When test specimens are to be taken
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
from a casting, the location shall be agreed on by the purchaser
dodssp.daps.dla.mil.
4 and the manufacturer and documented on the casting drawing.
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036, http://www.ansi.org. It is the manufacturer’s required responsibility to maintain
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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This document is not anASTM standard and is intended only to provide the user of anASTM 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:A842–10 Designation: A842 – 11
Standard Specification for
1
Compacted Graphite Iron Castings
This standard is issued under the fixed designation A842; 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 castings made of compacted graphite iron, which is described as cast iron with the graphite in
compacted (vermiform) shapes and essentially free of flake graphite.
1.2The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1
1.2 No precise quantitative relationship can be stated between the properties of iron in the various locations of the same casting
and those of a test bar cast from the same iron (see Appendix X1).
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exception—The inch-pound units in Figs. 1-3 and 5 are standard. SI units are added for information only.
1.3No precise quantitative relationship can be stated between the properties of iron in the various locations of the same casting
and those of a test bar cast from the same iron (see Appendix X1).
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A247 Test Method for Evaluating the Microstructure of Graphite in Iron Castings
E8/E8M Test Methods for Tension Testing of Metallic Materials
3
2.2 Federal Standard:
Federal Standard No. 123 Marking for Shipment (Civil Agencies)
4
2.3 American National Standard:
MIL-STD-129 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 and year of issue,
3.1.2 Grade of compacted graphite iron required as identified in Table 1,
3.1.3 Special properties if required, (see 4.1 and 10.1),
3.1.4 If samples other than those identified in Section 9 are required,
3.1.5 Certification if so designated by the purchaser, and
3.1.6 Special preparation for delivery if required.
4. Chemical Composition
4.1 It is the intent of this specification to subordinate chemical composition to mechanical properties; however, any chemical
requirement may be specified by agreement between the manufacturer and the purchaser.
1
This specification is under the jurisdiction ofASTM CommitteeA04 on Iron Castings and is the direct responsibility of SubcommitteeA04.02 on Malleable and Ductile
Iron Castings.
Current edition approved Dec.Feb. 1, 2010.2011. Published JanuaryMarch 2011. Originally approved in 1985. Last previous edition approved in 20092010 as
A842-85(2009).A842 - 10. DOI: 10.1520/A0842-101.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM 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, http://dodssp.daps.dla.mil.
4
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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A842 – 11
FIG. 1 Test Coupon for Microscopical Examination of Compacted Graphite Iron
NOTE—The length of the keel block shall be 6 in. (152 mm).
Metric Equivalents
in. mm in. mm
1 1
⁄2 12.7 1 ⁄2 38.1
1
1 25.4 2 ⁄2 63.5
FIG. 2 Keel Block
5. Requirements
5.1 Compacted graphite cast iron shall be examined metallographically for the acceptable graphite formation.
5.2 The metallographic examination shall be performed on a casting, a separately cast test coupon, as shown in Fig. 1 or on a
test lug from a casting. The test coupon or casting lug shall represent the last metal from the treated batch. The casting lug
dimension and location will be agreed on by manufacturer and purchaser.
5.3 When castings
...
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