1、Designation:A84211aStandard Specification forCompacted Graphite Iron Castings1This standard is issued under the fixed designation A842;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses
2、indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers castings made of compactedgraphite iron,which is described as cast iron with the graphitein compacted(vermiform)shapes and essentially
3、free of flakegraphite in the bulk of the casting.1.2 No precise quantitative relationship can be stated be-tween the properties of iron in the various locations of the samecasting and those of a test bar cast from the same iron(seeAppendix X1).1.3 The values stated in SI units are to be regarded ass
4、tandard.No other units of measurement are included in thisstandard.1.3.1 ExceptionThe inch-pound units in Figs.1-3 and arestandard.SI units are added for information only.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of
5、 the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A247 Test Method for Evaluating the Microstructure ofGraphite in Iron CastingsE8/E8M Test Methods for Ten
6、sion Testing of Metallic Ma-terials2.2 Federal Standard:3Federal Standard No.123 Marking for Shipment(CivilAgencies)2.3 American National Standard:4MIL-STD-129 Marking for Shipment and Storage3.Ordering Information3.1 Orders for material to this specification shall include thefollowing information:3
7、.1.1 ASTM designation and year of issue,3.1.2 Grade of compacted graphite iron required as identi-fied 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 arerequired,3.1.5 Certification if so designated by the purchaser,and3.1
8、.6 Special preparation for delivery if required.4.Chemical Composition4.1 It is the intent of this specification to subordinatechemical composition to mechanical properties;however,anychemical requirement may be specified by agreement betweenthe manufacturer and the purchaser.5.Requirements5.1 Compa
9、cted graphite cast iron shall be examined metal-lographically for the acceptable graphite formation.Nonde-structive testing such as ultrasonic velocity or resonancefrequency may also be used to determine the graphite nodu-larity.However,in cases of dispute,the metallographic exami-nation shall preva
10、il.5.2 The metallographic examination shall be performed on asample sectioned from the casting,on a separately cast testcoupon,as shown in Fig.1,or on a test lug from a casting.Thelocation on the casting from which the metallographic speci-men is sectioned shall be agreed by the manufacturer and the
11、purchaser.In the case of a test coupon or test lug,the specimenshall represent the last metal from the treated batch.Thecasting lug dimension and location shall be agreed by manu-facturer and purchaser.5.3 When castings are produced to this specification bytreating the iron in the mold for graphite
12、form control,themanufacturer may use separately cast test coupons or cut test1This specification is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.02 on Malleable andDuctile Iron Castings.Current edition approved May 1,2011.Published
13、 June 2011.Originallyapproved in 1985.Last previous edition approved in 2011 as A842 11.DOI:10.1520/A0842-11A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standar
14、ds Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/dodssp.daps.dla.mil.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.a
15、nsi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 specimens from castings to qualify conformance of the micro-structure requirements.When separately cast test coupons areused,the test coupons shall have a chemical compositionreprese
16、ntative of that in the castings,produced from that ironpoured,and having a cooling rate equivalent to that obtainedthrough use of test molds as shown in Figs.1-3.The size of thecast coupon representing the castings shall be the option of thepurchaser.In case no option is expressed,the manufacturershall make the choice.When test specimens are to be takenfrom a casting,the location shall be agreed on by the purchaserand the manufacturer and documented on the casting drawing.It is the manufacturers
