ASTM_D_4417_-_21.pdf

Designation:D441721Standard Test Methods forField Measurement of Surface Profile of Blast CleanedSteel1This standard is issued under the fixed designation D4417;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover the description of techniquesfor measuring the profile of abrasive blast cleaned surfaces inthe field,shop,and laboratory.There are other techniquessuitable for laboratory use not covered by these test methods.1.2 Method B may also be appropriate to the measurementof profile produced by using power tools.NOTE1The Method B procedure in this standard was developed foruse on flat surfaces.Depending on the radius of the surface,the resultscould have greater variability with lower values and averages.1.3 SSPC standard SSPC-PA 17 provides additional guid-ance for determining conformance with surface profile require-ments.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 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:2D7127 Test Method for Measurement of Surface Roughnessof Abrasive Blast Cleaned Metal Surfaces Using a Por-table Stylus InstrumentE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 SSPC Standard:3SSPC-PA 17 Procedure for Determining Conformance toSteel Profile/Surface Roughness/Peak Count Require-ments2.3 ASME Standard:4ASME B46.1-2002 Surface Texture,Surface RoughnessWaviness and Lay2.4 ISO Standards:5ISO4287:1997 GeometricalProductSpecifications(GPS)SurfaceTexture:ProfileMethodTerms,Definitions,and Surface Parameters3.Terminology3.1 Definitions of Terms Specific to This Standard:1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.46 on Industrial Protective Coatings.Current edition approved Jan.1,2021.Published January 2021.Originallyapproved in 1984.Last previous edition approved in 2020 as D4417 20A.DOI:10.1520/D4417-21.2For 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.3Available from Society for Protective Coatings(SSPC),800 Trumbull Dr.,Pittsburgh,PA 15205,http:/www.sspc.org.4Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Two Park Ave.,New York,NY 10016-5990,http:/www.asme.org.5Available from International Organization for Standardization(ISO),ISOCentral Secretariat,BIBC II,Chemin de Blandonnet 8,CP 401,1214 Vernier,Geneva,Switzerland,http:/www.iso.org.Copyright 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.13.1.1 deadband,nthat distance above and below the meanline that a continuous stylus trace line must cross in bothdirections(up and down)to count as a single peak.3.1.2 evaluation length,na sequence of five consecutivestylus sampling lengths.3.1.3 H,nthe average of the maximum peak-to-valleyheight distances obtained by measuring the thickness of replicatape.3.1.3.1 DiscussionHLis the thickness measurement ad-justed for tape non-linearity.3.1.4 Pd(peak density),nthe number of peaks per unitarea obtained from burnished replica tape.3.1.5 peak,na high point in a surface profile.3.1.6 Rpc(peak count),nthe number of peak/valley pairs,per unit of length,extending outside a“deadband”centered onthe mean line of a stylus trace.3.1.6.1 DiscussionFor the purpose of Rpc,a peak isdefined relative to an upper and lower height threshold.This is