1、Designation:A874/A874M98(Reapproved 2014)Standard Specification forFerritic Ductile Iron Castings Suitable for Low-TemperatureService1This standard is issued under the fixed designation A874/A874M;the number immediately following the designation indicates the yearof original adoption or,in the case
2、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 specification covers ductile iron castings suitablefor service at temperatures of 40F 40C and
3、 above.1.2 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-conformancewi
4、th the standard.1.3 The following precautionary statement pertains only tothe test 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 app
5、ropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:2A247 Test Method for Evaluating the Microstructure ofGraphite in Iron CastingsE8 Test Methods for Tension Testing of Metallic MaterialsE30 Test Method
6、s for ChemicalAnalysis of Steel,Cast Iron,Open-Hearth Iron,and Wrought Iron(Withdrawn 1995)3E59 Practice for Sampling Steel and Iron for Determinationof Chemical Composition(Withdrawn 1996)3E94 Guide for Radiographic ExaminationE165 Practice for Liquid Penetrant Examination for GeneralIndustryE351 T
7、est Methods for ChemicalAnalysis of Cast IronAllTypesE562 Test Method for Determining Volume Fraction bySystematic Manual Point CountE689 Reference Radiographs for Ductile Iron CastingsE709 Guide for Magnetic Particle Testing3.Ordering Information3.1 Orders for material under this specification shal
8、l includethe following applicable information:3.1.1 Drawing,catalog number,or part identification,3.1.2 Quantity(weight or number of pieces),3.1.3 ASTM designation and year of issue,3.1.4 Marking instructions(see Section 15),3.1.5 Place of inspection(see 13.1),3.1.6 Limits on residual elements(see 5
9、.2),3.1.7 Visual and dimensional acceptance standard(see 7.1),3.1.8 Sampling plan(see Section 9),and3.1.9 Supplementary requirements.4.Materials and Manufacture4.1 Castings may be supplied either as cast or heat treatedand shall have essentially a ferritic structure that contains nomassive carbides.
10、5.Chemical Composition5.1 The iron shall conform to the requirements for chemicalcomposition shown in Table 1.5.2 By agreement between the manufacturer and purchaser,analysis may be required and limits established for elementsnot specified in Table 1.6.Mechanical and Microstructural Properties6.1 Te
11、nsile PropertiesThe iron shall conform to the re-quirements for tensile properties shown in Table 2.6.2 MicrostructureGraphite contained in the microstruc-ture shall be evaluated in accordance with Test Method A247.The percent of each graphite type shall be estimated,and thetotal of all estimates sh
12、all equal 100%.The total percent ofTypes 1 and 2 graphite shall be a minimum of 90%.7.Workmanship,Finish,and Appearance7.1 The surface of the casting shall be examined visuallyand shall be free from adhering sand,scale,cracks,and hot1This specification is under the jurisdiction of ASTM Committee A04
13、 on IronCastings and is the direct responsibility of Subcommittee A04.02 on Malleable andDuctile Iron Castings.Current edition approved April 1,2014.Published April 2014.Originallyapproved in 1989.Last previous edition approved in 2009 as A874/A874M-98(2009).DOI:10.1520/A0874_A0874M-98R14.2For refer
14、enced 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.3The last approved version of this historical standard is referenced onwww.a
15、stm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 tears.Other surface discontinuities shall meet visual anddimensional acceptance standards specified in the order.7.2 Conditioning of castings is permitted to the extent thatthe remov
16、al of metal does not extend into the envelope of thefinished container and does not alter the properties of the metalremaining in the finished container.8.Repair8.1 Castings shall not be repaired by plugging,welding,brazing,impregnation,or any other means.9.Sampling9.1 Test coupons will be obtained from the casting.Thelocation in the casting from which the test coupons areobtained and the number obtained from each location shall beagreed upon between the manufacturer and purchaser.9.2 Metallogra