ASTM_A_536_-_84_2014.pdf

Designation:A53684(Reapproved 2014)Standard Specification forDuctile Iron Castings1This standard is issued under the fixed designation A536;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 indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers castings made of ductile iron,also known as spheroidal or nodular iron,that is described ascast iron with the graphite substantially spheroidal in shape andessentially free of other forms of graphite,as defined inTerminology A644.1.2 No precise quantitative relationship can be stated be-tween the properties of the iron in various locations of the samecasting or between the properties of castings and those of a testspecimen cast from the same iron(see Appendix X1).1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA644 Terminology Relating to Iron CastingsA732/A732M Specification for Castings,Investment,Car-bon and Low Alloy Steel for General Application,andCobalt Alloy for High Strength at Elevated TemperaturesE8 Test Methods for Tension Testing of Metallic Materials2.2 Military Standard:3MIL-STD-129 Marking for Shipment and Storage3.Ordering Information3.1 Orders for material to this specification shall include thefollowing information:3.1.1 ASTM designation,3.1.2 Grade of ductile iron required(see Table 1,andSections 4 and 9),3.1.3 Special properties,if required(see Section 7),3.1.4 If a different number of samples are required(seeSection 10),3.1.5 Certification,if required(see Section 14),and3.1.6 Special preparation for delivery,if required(see Sec-tion 15).4.Tensile Requirements4.1 The iron represented by the test specimens shall con-form to the requirements as to tensile properties presented inTables 1 and 2.The irons listed in Table 1 cover those ingeneral use,while those listed in Table 2 are used for specialapplications(such as pipes,fittings,etc.).4.2 The yield strength shall be determined at 0.2%offset bythe offset method(see Test Methods E8).Other methods maybe used by mutual consent of the manufacturer and purchaser.5.Heat Treatment5.1 The 60-40-18 grade will normally require a full ferritiz-ing anneal.The 120-90-02 and the 100-70-03 grades generallyrequire a quench and temper or a normalize and temper,or anisothermal heat treatment.The other two grades can be meteither as-cast or by heat treatment.Ductile iron,which is heattreated by quenching to martensite and tempering,may havesubstantially lower fatigue strength than as-cast material of thesame hardness.6.Test Coupons6.1 The separately cast test coupons from which the tensiontest specimens are machined shall be cast to the size and shapeshown in Fig.1 or Fig.2.A modified keel block cast from themold shown in Fig.3 may be substituted for the 1-in.Y-blockor the 1-in.keel block.The test coupons shall be cast in openmolds made of suitable core sand having a minimum wallthickness of 112in.(38 mm)for the12-in.(12.5 mm)and 1-in.(25-mm)sizes and 3 in.(75 mm)for the 3-in.size.Thecoupons shall be left in the mold until they have cooled to ablack color(approximately 900F(482C)or less).The size ofcoupon cast to represent the casting shall be at the option of the1This specification is under the jurisdiction of the ASTM Committee A04 onIron Castings and is the direct responsibility of Subcommittee A04.02 on Malleableand Ductile Iron Castings.Current edition approved Oct.1,2014.Published October 2014.Originallyapproved in 1965.Last previous edition approved in 2009 as A53684(2009).DOI:10.1520/A0536-84R14.2For 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 standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,Section D,700 Robbins Ave.,Philadelphia,PA 19111-5098Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 purchaser.In case no option is expressed,the manufacturershall make the choice.6.2 When investment castings are made to this specification,the manufacturer may use test specimens cast to size incorpo-rated in the mold with the castings,or separately cast to sizeusing the same type of mold and the same thermal conditionsthat are used to produce the castings.These test specimensshall be made to the dimensions shown in Fig.1 of Specifica-tion A732/A732M or Figs.5 and 6 of Test Methods a