ASTM_A_48_-_A_48M_-_03_2016.pdf

Designation:A48/A48M03(Reapproved 2016)Standard Specification forGray Iron Castings1This standard is issued under the fixed designation A48/A48M;the number immediately following the designation indicates the yearof 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.This standard has been approved for use by agencies of the U.S.Department of Defense.This specification replaces Federal Specification QQ-I-652.1.Scope1.1 This specification covers gray iron castings intended forgeneral engineering use where tensile strength is a majorconsideration.Castings are classified on the basis of the tensilestrength of the iron in separately cast test bars.1.1.1 This specification subordinates chemical compositionto tensile strength.1.2 Castings produced to this specification are graded on thebasis of minimum tensile strength obtained in special testcoupons designed to standardize cooling rate.The tensilestrength developed in certain casting sections may vary fromtest coupon values(see X1.2).1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:A644 Terminology Relating to Iron CastingsE8 Test Methods for Tension Testing of Metallic Materials2.2 Military Standard:MIL-STD-129 Marking for Shipment and Storage22.3 Federal Standard:Federal Standard No.123 Marking for Shipment(CivilAgencies)23.Terminology3.1 Definitions:3.1.1 Definitions for many terms common to gray ironcastings are found in Terminology A644.4.Classification4.1 Castings ordered and produced in accordance with thisspecification are classified into a number of grades based on theproperties of separately cast test bars(Tables 1 and 2).Eachclass is designated by a number followed by a letter.Thenumber indicates the minimum tensile strength of the sepa-rately cast test bar,and the letter indicates the size of the testbar.Examples of proper designations are as follows:Gray Iron Castings,ASTM Specification A48,Class 30B.Gray Iron Castings,ASTM Specification A48,Class 40C.5.Ordering Information5.1 Orders for material to this specification shall include thefollowing information:5.1.1 ASTM designation number and year of issue,5.1.2 Class of iron required(see 4.1,and Tables 1 and 2),5.1.3 The size of the separately cast test bar(letterclassificationA,B,C,or S)that best represents the thicknessof the controlling section of the casting(see Table 3),5.1.4 The tension test specimen(B or C)to be machinedfrom test bar C(see 13.3,Table 4,and Fig.1),5.1.5 The tension test specimen to be machined from testbar S(see 13.4,Table 4,and Fig.1),5.1.6 Lot size(see Section 10),5.1.7 Special requirements(see Section 6),5.1.8 Saving tested specimens or unbroken test bars(see15.1),and5.1.9 Special preparation for delivery(see Section 19).6.Special Requirements6.1 When agreed upon in writing between the manufacturerand the purchaser,it may be necessary for the castings to meetspecial requirements as to hardness,chemical composition,microstructure,pressure tightness,radiographic soundness,dimensions,surface finish,and so forth.7.Tensile Requirements7.1 Test bars representing castings conforming to this speci-fication shall meet the requirements for tensile strength asdescribed in Tables 1 and 2.1This specification is under the jurisdiction of ASTM Committee A04 on IronCastings and is the direct responsibility of Subcommittee A04.01 on Grey and WhiteIron Castings.Current edition approved Nov.1,2016.Published November 2016.Originallyapprovedin1905.Lastpreviouseditionapprovedin2012asA48/A48M 03(2012).DOI:10.1520/A0048_A0048M-03R16.2Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Dimensional Requirements8.1 The castings shall conform to the dimensions or draw-ings furnished by the purchaser,or,if there are no drawings,tothe dimensions predicted by the pattern equipment supplied bythe purchaser.9.Workmanship and Finish9.1 The surface of the casting shall be free of adhering sand,scale,cracks,and hot tears,as determined by visual examina-tion.9.2 No repairing by plugging or welding of any kind shallbe permitted unless written permission is granted by thepurchaser.10.Sampling10.1 A lot shall consist of one of the following:10.1.1 All the metal poured from a single heating in a batchtype melting furnace.10.1.2 All the metal from two or more batch type meltingfurnaces poured into a single ladle or a single casting.10.1.3 All the metal pou