ASTM A842-10

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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1 Exception—The inch-pound units in Figs. 1-3 are standard. SI units are added for information only.
1.3 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).

General Information

• Status: Historical
• Publication Date: 30-Nov-2010
• ICS: 77.080.10 - Irons
• 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 A842-85(2009) - Standard Specification for Compacted Graphite Iron Castings
• Effective Date: 01-Dec-2010
• Replaced By: ASTM A842-11 - Standard Specification for Compacted Graphite Iron Castings
• Effective Date: 01-Feb-2011
• Referred By: ASTM A1095-15(2019) - Standard Specification for High-Silicon Molybdenum Ferritic Iron Castings
• Effective Date: 01-Dec-2010
• Referred By: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 01-Dec-2010

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A842 – 10
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 3.1.2 Grade of compacted graphite iron required as identi-
fied in Table 1,
1.1 This specification covers castings made of compacted
3.1.3 Special properties if required, (see 4.1 and 10.1),
graphite iron, which is described as cast iron with the graphite
3.1.4 If samples other than those identified in Section 9 are
in compacted (vermiform) shapes and essentially free of flake
required,
graphite.
3.1.5 Certification if so designated by the purchaser, and
1.2 The values stated in SI units are to be regarded as
3.1.6 Special preparation for delivery if required.
standard. No other units of measurement are included in this
standard.
4. Chemical Composition
1.2.1 Exception—The inch-pound units in Figs. 1-3 are
4.1 It is the intent of this specification to subordinate
standard. SI units are added for information only.
chemical composition to mechanical properties; however, any
1.3 No precise quantitative relationship can be stated be-
chemical requirement may be specified by agreement between
tweenthepropertiesofironinthevariouslocationsofthesame
the manufacturer and the purchaser.
casting and those of a test bar cast from the same iron (see
Appendix X1).
5. Requirements
5.1 Compacted graphite cast iron shall be examined metal-
2. Referenced Documents
2 lographically for the acceptable graphite formation.
2.1 ASTM Standards:
5.2 Themetallographicexaminationshallbeperformedona
A247 Test Method for Evaluating the Microstructure of
casting, a separately cast test coupon, as shown in Fig. 1 or on
Graphite in Iron Castings
a test lug from a casting. The test coupon or casting lug shall
E8/E8M Test Methods for Tension Testing of Metallic
represent the last metal from the treated batch. The casting lug
Materials
3 dimension and location will be agreed on by manufacturer and
2.2 Federal Standard:
purchaser.
Federal Standard No. 123 Marking for Shipment (Civil
5.3 When castings are produced to this specification by
Agencies)
4
treating the iron in the mold for graphite form control, the
2.3 American National Standard:
manufacturer may use separately cast test coupons or cut test
MIL-STD-129 Marking for Shipment and Storage
specimens from castings to qualify conformance of the micro-
3. Ordering Information structure requirements. When separately cast test coupons are
used, the test coupons shall have a chemical composition
3.1 Orders for material to this specification shall include the
representative of that in the castings, produced from that iron
following information:
poured, and having a cooling rate equivalent to that obtained
3.1.1 ASTM designation and year of issue,
through use of test molds as shown in Figs. 1-3.The size of the
cast coupon representing the castings shall be the option of the
1
This specification is under the jurisdiction of ASTM Committee A04 on Iron
purchaser. In case no option is expressed, the manufacturer
Castings and is the direct responsibility of SubcommitteeA04.02 on Malleable and
shall make the choice. When test specimens are to be taken
Ductile Iron Castings.
from a casting, the location shall be agreed on by the purchaser
Current edition approved Dec. 1, 2010. Published January 2011. Originally
approved in 1985. Last previous edition approved in 2009 as A842 - 85 (2009).
and the manufacturer and documented on the casting drawing.
DOI: 10.1520/A0842-10.
It is the manufacturer’s required responsibility to maintain
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
adequate controls and documentation to assure the customer
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on that test specimen microstructures are representative of micro-
the ASTM website.
structure in the castings shipped.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
5.4 The acceptable graphite formation in the microstructure
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
of the test coupon or casting lug shall contain 80 % minimum
dodssp.daps.dla.mil.
4
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
Type IV graphite (see Plate 1, Graphite Form Types of Test
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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...

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:A842–85 (Reapproved 2009) Designation: A842 – 10
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.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1 Exception—The inch-pound units in Figs. 1-3 are standard. SI units are added for information only.
1.3 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).
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.
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 are produced to this specification by treating the iron in the mold for graphite form control, the manufacturer
may use separately cast test coupons or cut test specimens from castings to qualify conformance of the microstructure
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 MayDec. 1, 2009.2010. Published September 2009.January 2011. Originally approved in 1985. Last previous edition approved in 20042009 as
A842 - 85 (20049). DOI: 10.1520/A0842-85R09.10.1520/A0842-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. ForAnnualBookofASTMStandards
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 19111-5094, Attn: NPODS.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 – 10
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. 3 2 Keel Block
requirements. When separately cast test coupons are used, the test coupons shall have a chemical composition representative of
that in the castings, produced from that iron poured, and having a cooling rate equivalent to that obtained through use of test molds
as shown in Figs. 1-43.The size of the cast coupon representing the
...