ASTM A842-11a

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 in the bulk of the casting.  
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.

General Information

• Status: Historical
• Publication Date: 30-Apr-2011
• 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 A842-11 - Standard Specification for Compacted Graphite Iron Castings
• Effective Date: 01-May-2011
• Referred By: ASTM A1095-15(2019) - Standard Specification for High-Silicon Molybdenum Ferritic Iron Castings
• Effective Date: 01-May-2011
• Referred By: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 01-May-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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:A842 −11a
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.
4
1. Scope 2.3 American National Standard:
MIL-STD-129 Marking for Shipment and Storage
1.1 This specification covers castings made of compacted
graphite iron, which is described as cast iron with the graphite
3. Ordering Information
in compacted (vermiform) shapes and essentially free of flake
3.1 Orders for material to this specification shall include the
graphite in the bulk of the casting.
following information:
1.2 No precise quantitative relationship can be stated be-
3.1.1 ASTM designation and year of issue,
tweenthepropertiesofironinthevariouslocationsofthesame
3.1.2 Grade of compacted graphite iron required as identi-
casting and those of a test bar cast from the same iron (see
fied in Table 1,
Appendix X1).
3.1.3 Special properties if required, (see 4.1 and 10.1),
1.3 The values stated in SI units are to be regarded as
3.1.4 If samples other than those identified in Section 9 are
standard. No other units of measurement are included in this required,
standard.
3.1.5 Certification if so designated by the purchaser, and
1.3.1 Exception—The inch-pound units in Figs. 1-3 and are 3.1.6 Special preparation for delivery if required.
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.
2. Referenced Documents 5. Requirements
2
2.1 ASTM Standards: 5.1 Compacted graphite cast iron shall be examined metal-
A247 Test Method for Evaluating the Microstructure of lographically for the acceptable graphite formation. Nonde-
Graphite in Iron Castings structive testing such as ultrasonic velocity or resonance
frequency may also be used to determine the graphite nodu-
E8/E8M Test Methods for Tension Testing of Metallic Ma-
terials larity. However, in cases of dispute, the metallographic exami-
3
nation shall prevail.
2.2 Federal Standard:
Federal Standard No. 123 Marking for Shipment (Civil
5.2 Themetallographicexaminationshallbeperformedona
Agencies)
sample sectioned from the casting, on a separately cast test
coupon, as shown in Fig. 1, or on a test lug from a casting.The
location on the casting from which the metallographic speci-
men is sectioned shall be agreed by the manufacturer and the
purchaser. In the case of a test coupon or test lug, the specimen
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 shall represent the last metal from the treated batch. The
Ductile Iron Castings.
casting lug dimension and location shall be agreed by manu-
Current edition approved May 1, 2011. Published June 2011. Originally
facturer and purchaser.
approved in 1985. Last previous edition approved in 2011 as A842 – 11. DOI:
10.1520/A0842-11A.
5.3 When castings are produced to this specification by
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
treating the iron in the mold for graphite form control, the
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
manufacturer may use separately cast test coupons or cut test
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,
4
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:// Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
dodssp.daps.dla.mil. 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

---------------------- Page: 1 ----------------------
A842−11a
FIG. 1 Test Coupon for Microscopical Examination of Compacted Graphite Iron
NOTE 1—The length of the keel block shall be 6 in. (152 mm).
that test specimen microstructures are representative of micro-
structure in the castings shipped.
5.4 The acceptable graphite formation in the microstructure
of the t
...

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:A842–11 Designation: A842 – 11a
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 in the bulk of the casting.
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.
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
5.1Compacted graphite cast iron shall be examined metallographically for the acceptable graphite formation.
5.2The metallographic examination shall be performed on a casting, a separately cast test coupon, as shown in
5.1 Compacted graphite cast iron shall be examined metallographically for the acceptable graphite formation. Nondestructive
testingsuchasultrasonicvelocityorresonancefrequencymayalsobeusedtodeterminethegraphitenodularity.However,incases
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 Feb.May 1, 2011. Published MarchJune 2011. Originally approved in 1985. Last previous edition approved in 20102011 as A842 - 101. DOI:
10.1520/A0842-11A.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. 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

---------------------- Page: 1 ----------------------
A842 – 11a
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
of dispute, the metallographic examination shall prevail.
5.2 Themetallographicexaminationshallbeperformedonasamplesectionedfromthecasting,onaseparatelycasttestcoupon,
asshowninFig.1,oronatestlugfromacasting.Thelocationonthecastingfromwhichthemetallographicspecimenissectioned
shall be agreed by the manufacturer and t
...