ASTM_A_990_-_A_990M_-_14a.pdf

Designation:A990/A990M14aStandard Specification forCastings,Iron-Nickel-Chromium and Nickel Alloys,SpeciallyControlled for Pressure Retaining Parts for CorrosiveService1This standard is issued under the fixed designation A990/A990M;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.Scope*1.1 This specification covers iron-nickel-chromium andnickel alloy castings specially processed with restricted meltpractices,weldability testing,and nondestructive examination(NDE)requirements.1.2 Anumber of grades of iron-nickel-chromium and nickelalloy castings are included in this specification.Since thesegrades possess varying degrees of suitability for service incorrosive environments,it is the responsibility of the purchaserto determine which grade shall be furnished.Selection willdepend on design and service conditions,mechanicalproperties,and corrosion-resistant characteristics.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 This specification is expressed in both inch-poundunits and in SI units;however,unless the purchase order orcontract specifies the applicable M specification designation(SI units),the inch-pound units shall apply.Within the text,theSI units are shown in brackets or parentheses.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A351/A351M Specification for Castings,Austenitic,forPressure-Containing PartsA488/A488M Practice for Steel Castings,Welding,Qualifi-cations of Procedures and PersonnelA494/A494M Specification for Castings,Nickel and NickelAlloyA703/A703M Specification for Steel Castings,GeneralRequirements,for Pressure-Containing PartsA743/A743M Specification for Castings,Iron-Chromium,Iron-Chromium-Nickel,Corrosion Resistant,for GeneralApplicationA744/A744M Specification for Castings,Iron-Chromium-Nickel,Corrosion Resistant,for Severe ServiceA802/A802M Practice for Steel Castings,Surface Accep-tance Standards,Visual ExaminationA903/A903M Specification for Steel Castings,Surface Ac-ceptance Standards,Magnetic Particle and Liquid Pen-etrant InspectionA985/A985M Specification for Steel Investment CastingsGeneral Requirements,for Pressure-Containing PartsE94 Guide for Radiographic ExaminationE165 Practice for Liquid Penetrant Examination for GeneralIndustryE186 Reference Radiographs for Heavy-Walled(2 to 412-in.(50.8 to 114-mm)Steel CastingsE272 Reference Radiographs for High-Strength Copper-Base and Nickel-Copper Alloy CastingsE280 Reference Radiographs for Heavy-Walled(412to 12-in.(114 to 305-mm)Steel Castings1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved Oct.1,2014.Published November 2014.Originallyapproved in 1998.Last previous edition approved in 2014 as A990/A990M 14.DOI:10.1520/A0990_A0990M-14A.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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 E446 Reference Radiographs for Steel Castings Up to 2 in.(50.8 mm)in Thickness2.2 AWS Standards:3AWS A5.4,Specification for Stainless Steel Electrodes forShielded Metal Arc WeldingAWS A5.9,Specification for Bare Stainless Steel WeldingElectrodes and RodsAWS A5.11/A5.11M,Specification for Nickel and NickelAlloy Welding Electrodes for Shielded MetalArc WeldingAWS A5.14/A5.14M,Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods2.3 ASME/ANSI Standard:4ASME/ANSI B16.34,Valves-Flanged,Threaded,and Weld-ing End3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 accessible surface,nsurface that can be welded onwithout cutting access holes in the casting.3.1.2 refined ingot,nmetal processed by argon-oxygen-decarburization(AOD)or vacuum-oxygen-decarburization(VOD)and cast to a size and shape suitable for remelting.3.1.3 revert,ngates,risers,and castings.Also includesscrapped machinery and fabricated items,chips,and turnings.4.General Condi