ASTM_A_503_-_A_503M_-_15.pdf

Designation:A503/A503M15Standard Specification forUltrasonic Examination of Forged Crankshafts1This standard is issued under the fixed designation A503/A503M;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 is an acceptance specification for the ultrasonicinspection of forged steel crankshafts having main bearingjournals or crankpins 4 in.100 mm or larger in diameter.1.2 This specification covers the testing equipment requiredand the test procedure to be followed,and it defines the criticaland noncritical areas and limits of acceptance.1.3 This specification is intended to cover both continuousgrain flow(CGF)crankshafts for medium and high speeddiesel engines as well as solid(slab)forged crankshafts forother applications.1.4 The values stated in either inch-pound units or SI(metric)units are to be regarded separately as the standard.Within the text and tables,the SI units are shown in brackets.The values stated in each system shall be used independently ofthe other.Combining values from the two systems may resultin nonconformance with the specification.1.5 Unless the order specifies the applicable“M”specifica-tion designation,the inch-pound units shall be used.1.6 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:2A388/A388M Practice for Ultrasonic Examination of SteelForgingsA788/A788M Specification for Steel Forgings,General Re-quirementsE428 Practice for Fabrication and Control of Metal,Otherthan Aluminum,Reference Blocks Used in UltrasonicTesting2.2 American National Standard:3ANSI B46.1,Surface Texture3.Terminology3.1 Definitions:3.1.1 continuous grain flow crankshaftsproduced by aprocess in which the solidification centerline of the originalingot or starting stock is maintained through the main bearings,webs,crankpins,and flanges of the finished crankshaft,usuallyby means of closed die forging.3.1.2 solid(slab)forged crankshaftsmade from open dieforgings such that the grain flow in the webs is essentiallyparallel to the major axis of the forging and the crankpins areoffset from the forging centerline by machining.They may beset in the correct orientation by a hot twisting operation.4.Ordering Information4.1 It is necessary that the crankshaft be identified as beingeither continuous grain flow or solid(slab)forged.4.2 Unless otherwise specified by means of supplementaryordering information,the test methods and acceptance criteriafor the appropriate crankshaft type shall be used.5.Apparatus and Personnel Requirements5.1 The apparatus and personnel requirements shall be inaccordance with Practice A388/A388M.For standardizationpurposes,it is recommended that final acceptance be based onthe use of 25 MHz transducers.6.Critical Sections6.1 The division of a crankshaft into three volumetric zones,as shown in Fig.1 and Fig.2,for the purpose of ultrasonicexamination evaluation is applicable to both solid(slab)forgedand continuous grain flow crankshafts.6.2 The major critical sections shown as Zone 1 in Fig.1include the heavily loaded areas of the crankpins,webs,andmain bearings.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved May 1,2015.Published May 2015.Originallyapproved in 1964.Last previous edition approved in 2011 as A503/A503M01(2011).DOI:10.1520/A0503_A0503M-15.2For 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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.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 States1 6.3 The minor critical sections shown as Zone 2 in Fig.1include the balance of the surface areas of the main bearing andcrankpin journals and adjacent fillets,flanges,and gear fitareas.6.4 The balance of the crankshaft as shown in Fig.1,including the remaining sections of the webs,is included inZone 3.7.Calibration of Ultrasonic Equipment on Crankshaft7.1 For solid(slab)forged crankshafts,the sensitivity of theinstrument shall be adjusted so that the thickness to beexamined will give a full-scale back reflection.Such calibra-tions shal