ASTM_A_571_-_A_571M_-_01_2015.pdf

Designation:A571/A571M01(Reapproved 2015)Standard Specification forAustenitic Ductile Iron Castings for Pressure-ContainingParts Suitable for Low-Temperature Service1This standard is issued under the fixed designation A571/A571M;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.1.Scope1.1 This specification2covers austenitic ductile iron,TypeD-2M,Classes 1 and 2,for compressors,expanders,pumps,valves,and other pressure-containing parts intended primarilyfor low-temperature service.1.2 These grades of austenitic ductile iron are characterizedby having their graphite substantially in a spheroidal form andfree of flake graphite.They are essentially free of carbides andcontain sufficient alloy content to produce a stable austeniticmatrix down to 423F 252C(liquid hydrogen).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.1.3.1 Within the text,the SI units are shown in brackets.1.4 The following precautionary caveat pertains only to thetest methods portion,Section 11,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:3A941 Terminology Relating to Steel,Stainless Steel,RelatedAlloys,and FerroalloysE8 Test Methods for Tension Testing of Metallic MaterialsE23 Test Methods for Notched Bar Impact Testing of Me-tallic MaterialsE30 Test Methods for ChemicalAnalysis of Steel,Cast Iron,Open-Hearth Iron,and Wrought Iron(Withdrawn 1995)4E59 Practice for Sampling Steel and Iron for Determinationof Chemical Composition(Withdrawn 1996)43.Ordering Information3.1 Orders for material under this specification shall includethe following information:3.1.1 Quantity(weight or number of pieces),3.1.2 ASTM designation and year of issue,3.1.3 Material class(Table 1),3.1.4 Impact test temperature requirement(Section 11),3.1.5 Place of inspection(Section 13),and3.1.6 Certification requirements(Section 14).4.Materials and Manufacture4.1 MaterialThe iron shall be made in the electric-arcfurnace,induction furnace,cupola,or any other furnace whichis capable of producing castings meeting the chemical compo-sitions and mechanical properties in this specification.4.2 Heat Treatment:4.2.1 All castings shall be heat treated.4.2.2 Heat treatment shall be performed before machiningexcept in instances when reheat treating is necessary.4.2.3 Heat treatment shall consist of annealing.The proce-dure for this type treatment shall consist of heating the castingto a minimum of 1600F 870C but not greater than 1800F980C holding at that temperature not less than 1 h/in.1 h/25mm of section and furnace cooling.(See Terminology A941.)5.Chemical Requirements5.1 Drillings taken from test coupons,broken test speci-mens or castings shall conform to the requirements as tochemical composition prescribed in Table 2.1This 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 Nov.1,2015.Published November 2015.Originallyapproved in 1966.Last previous edition approved in 2011 as A571/A571M 01(2011).DOI:10.1520/A0571_A0571M-01R15.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-571 in Section II of that code.3For 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.4The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The chemical analysis for total carbon shall be made oneither chilled cast pencil-type specimens or thin wafers ap-proximately132-in.0.8-mm thick cut from test coupons.Drillings shall not be used because of attendant loss ofgraphite.6.Physical Property Requirements6.1 Tensile PropertiesThe room temperature mechanicalproperties of the two classes of ductile iron used for the castingshall conform to the requirements for the heat-treated conditionshown in Table 1.6.2 Impact PropertiesThe notched-bar impact propertiesof the materials shall be determined by testing a set of threeCharpy V-notch i