ASTM_A_688_-_A_688M_-_18.pdf

Designation:A688/A688M18Standard Specification forSeamless and Welded Austenitic Stainless Steel FeedwaterHeater Tubes1This standard is issued under the fixed designation A688/A688M;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 specification2covers seamless and welded auste-nitic stainless steel feedwater heater tubes including those bent,if specified,into the form of U-tubes for application in tubularfeed-water heaters.1.2 The tubing sizes covered shall be58to 1 in.15.9 to25.4 mm inclusive outside diameter,and average or minimumwall thicknesses of 0.028 in.0.7 mm and heavier.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thestandard.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3A262 Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsA480/A480M Specification for General Requirements forFlat-Rolled Stainless and Heat-Resisting Steel Plate,Sheet,and StripA941 Terminology Relating to Steel,Stainless Steel,RelatedAlloys,and FerroalloysA1016/A1016M Specification for General Requirements forFerritic Alloy Steel,Austenitic Alloy Steel,and StainlessSteel TubesE112 Test Methods for Determining Average Grain SizeE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)2.2 Other Standard:SAE J1086 Practice for Numbering Metals and Alloys(UNS)43.Terminology3.1 Definitions Of TermsFor definitions of terms used inthis specification,refer to Terminology A941.4.Ordering Information4.1 It is the responsibility of the purchaser to specify allrequirements that are necessary for material under this speci-fication.Such requirements may include,but are not limited to,the following:4.1.1 Quantity(length or number of pieces),4.1.2 Material description(seamless or welded),4.1.3 DimensionsOutside diameter,wall thickness(mini-mum or average wall),and length,4.1.4 Grade(chemical composition)(Table 1),4.1.5 U-bend requirements,if order specifies bending,U-bend schedules or drawings shall accompany the order,4.1.6 Optional requirementsPurchaser shall specify if an-nealing of the U-bends is required or whether tubes are to behydrotested or air tested(see 11.8)4.1.7SupplementaryrequirementsPurchasershallspecify on the purchase order if material is to be eddy currenttested in accordance with Supplementary Requirements S1 orS2,and if special test reports are required under SupplementaryRequirement S3,and,4.1.8 Any additional special requirements.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.10 on Stainless and Alloy Steel Tubular Products.Current edition approved Sept.1,2018.Published September 2018.Originallyapproved in 1973.Last previous edition approved in 2015 as A688/A688M 15.DOI:10.1520/A0688_A0688M-18.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-688 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.4Available from Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001,http:/www.sae.org.*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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 TABLE 1 Chemical RequirementsElementGrade.TP 304TP 304LTP 304LNTP 316TP 316LTP 316LNTP XM-29TP 304NTP 316N.800800H.UNSDesignationA.S30400S30403S30453S31600S31603S31653S24000S30451S31651N08367N08800N08810N08811N08926S31254S32654Composition,%Carbon,max0.080.0350.0350.080.0350.0350.0600.080.080.0300.100.050.100.060.100.0200.0200.020Manganese,maxB2.002.002.002.