1、Designation:A518/A518M99(Reapproved 2012)Standard Specification forCorrosion-Resistant High-Silicon Iron Castings1This standard is issued under the fixed designation A518/A518M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year
2、 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.1.Scope1.1 This specification covers high-si
3、licon cast iron castingsintended for corrosion-resistant service.1.2 This specification covers three grades as shown in Table1.Selection of grade depends on the corrosive service to beexperienced by the casting.All three grades are suited forapplication in severe corrosive environments.However,Grade
4、2 is particularly suited for application in strong chlorideenvironments,and Grade 3 is recommended for impressedcurrent anodes.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,
5、eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 The following safety hazards caveat pertains only to thetest method portion,Section 9,of this specification:Thisstandard does not purport to address all of the
6、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:2A438 Test Method for Transverse Te
7、sting of Gray Cast Iron(Withdrawn 2003)3E350 Test Methods for Chemical Analysis of Carbon Steel,Low-Alloy Steel,Silicon Electrical Steel,Ingot Iron,andWrought IronE351 Test Methods for ChemicalAnalysis of Cast IronAllTypes3.Ordering Information3.1 Orders for material under this specification shall i
8、ncludethe following information:3.1.1 ASTM designation and year of issue.3.1.2 Grade of high-silicon cast iron(see Section 5).3.1.3 Number of castings.3.1.4 Approximate weight of the casting.3.1.5 Drawing showing the size,shape,dimensions,andfinishing details.The drawing should indicate any critical
9、dimensions and should give the allowable tolerances on alldimensions and on the accumulation of dimensions.If thepurchaser supplies the pattern,the dimensions of the castingshall conform to those predicted by the pattern.3.1.6 Options in this specification,including:3.1.6.1 The status of the heat tr
10、eatment of the castings whenshipped by the manufacturer(see Section 7).3.1.6.2 If the chemical analysis and mechanical test resultsare to be reported to the purchaser(see Section 14).3.1.6.3 If a transverse test is required(see 8.1).3.1.6.4 If hydraulic testing is required,and,if required,thetest pr
11、essure and the leakage permitted(see 8.2).3.1.6.5 Any special packing,markings,etc.4.Method of Manufacture4.1 The alloy may be produced by any melting and castingprocess,or combination of processes,capable of meeting thechemical composition and mechanical properties specified.5.Chemical Composition5
12、.1 High-silicon iron castings are produced in one of threegrades,as given in Table 1 of this specification.6.Chemical Analysis6.1 Heat AnalysisChemical analysis of each heat(or eachtap,if from a continuous melting operation)shall be made bythe manufacturer to determine the percentages of the element
13、sspecified in Table 1.The analysis shall be made from a testsample cast during the pouring of the heat(or tap).Thechemical composition thus determined shall conform to therequirements specified for that grade in Table 1.1This specification is under the jurisdiction of ASTM Committee A04 on IronCasti
14、ngs and is the direct responsibility of Subcommittee A04.01 on Grey and WhiteIron Castings.Current edition approved Oct.1,2012.Published November 2012.Originallyapproved in 1964.Last previous edition approved in 2008 as A518/A518M 99(2008).DOI:10.1520/A0518_A0518M-99R12.2For referenced ASTM standard
15、s,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.astm.org.Copyright A
16、STM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 Product AnalysisA product analysis may be made bythe purchaser from material representing each heat,lot,orcasting.The sample for such analysis shall be taken as desiredby the purchaser.The chemical composition thus determinedshall meet the requirements for the grade specified.6.3 Routine Analysis MethodsSpectrometric and otherinstrumental methods or wet chemical laboratory methods areacceptable
