ASTM_D_807_-_14.pdf

Designation:D80714Standard Practice forAssessing the Tendency of Industrial Boiler Waters toCause Embrittlement(USBM1Embrittlement DetectorMethod)2This standard is issued under the fixed designation D807;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice,3known as the embrittlement-detectormethod,covers the apparatus and procedure for determiningthe embrittling or nonembrittling characteristics of the water inan operating boiler.The interpretation of the results shall berestricted to the limits set forth in 8.6.NOTE1The embrittlement detector was designed to reproduce closelythe conditions existing in an actual boiler seam.It is considered probablethat the individual conditions of leakage,concentration,and stress in theboiler seam can equal those in the detector.The essential differencebetween the detector and the boiler is that the former is so constructed andoperated that these three major factors act simultaneously,continuously,and under the most favorable circumstances to produce cracking;whereas,in the boiler the three factors are brought together only under uniquecircumstances.Furthermore,in the detector any cracking is produced in asmall test surface that can be inspected thoroughly,while the susceptibleareas in a boiler are large and can be inspected only with difficulty.Inthese respects the embrittlement detector provides an accelerated test ofthe fourth condition necessary for embrittlement,the embrittling nature ofthe boiler water.NOTE2Cracks in a specimen after being subjected to this test indicatethat the boiler water can cause embrittlement cracking,but not that theboiler in question necessarily has cracked or will crack.1.2 The effectiveness of treatment to prevent cracking,aswell as an indication of whether an unsafe condition exists,areshown by this practice.Such treatments are evaluated in termsof method specimen resistance to failure.1.3 The practice may be applied to embrittlement resistancetesting of steels other than boiler plate,provided that aduplicate,unexposed specimen does not crack when bent 90on a 2-in.(51-mm)radius.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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:5A108 Specification for Steel Bar,Carbon and Alloy,Cold-FinishedA515/A515M Specification for Pressure Vessel Plates,Car-bon Steel,for Intermediate-and Higher-Temperature Ser-viceD1129 Terminology Relating to WaterD1193 Specification for Reagent WaterE3 Guide for Preparation of Metallographic SpecimensE883 Guide for ReflectedLight PhotomicrographyE1351 Practice for Production and Evaluation of FieldMetallographic Replicas3.Terminology3.1 DefinitionsFor definitions of other terms used in thispractice,refer to Terminology D1129.3.2 Definitions of Terms Specific to This Standard:3.2.1 embrittlement cracking,na form of metal failurethat occurs in steam boilers at riveted joints and at tube ends,the cracking being predominantly intercrystalline.3.2.1.1 DiscussionThis form of cracking,which has beenknown as“caustic embrittlement,”is believed to result fromthe action of certain constituents of concentrated boiler water1United States Bureau of Mines.2This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.03 on Sampling Water andWater-Formed Deposits,Analysis of Water for Power Generation and Process Use,On-Line Water Analysis,and Surveillance of Water.Current edition approved Jan.1,2014.Published January 2014.Originallyapproved in 1944.Last previous edition approved in 2009 as D807 05(2009).DOI:10.1520/D0807-14.3This test method was developed during an investigation conducted under acooperative agreement between the Joint Research Committee on Boiler FeedwaterStudies and the United States Bureau of Mines.For information on the developmentof this test method reference may be made to the following:Schroeder and Berk,1941(1);4Schroeder,Berk,and Stoddard,1941(2);Transactions of the AmericanSociety of Mechanical Engineers,1942(3);Whirl and Purcell,1942(4);and Berkand Schroeder,1943(5).5For 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.Copyrigh