1、Designation:A388/A388M16aUsed in USNRC-RDT standardsStandard Practice forUltrasonic Examination of Steel Forgings1This standard is issued under the fixed designation A388/A388M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year
2、 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 practice2covers the examination procedures for thecontact,pulse-echo ultrasonic examination of steel forgings by
3、the straight and angle-beam techniques.The straight beamtechniques include utilization of the DGS(Distance Gain-Size)method.See Appendix X3.1.2 This practice is to be used whenever the inquiry,contract,order,or specification states that forgings are to besubject to ultrasonic examination in accordan
4、ce with PracticeA388/A388M.1.3 Supplementary requirements of an optional nature areprovided for use at the option of the purchaser.The supple-mentary requirements shall apply only when specified indi-vidually by the purchaser in the purchase order or contract.1.4 The values stated in either SI units
5、 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.1.5 This specification and the
6、applicable material specifica-tions are expressed in both inch-pound units and SI units.However,unless the order specifies the applicable“M”speci-fication designation SI units,the material shall be furnishedto inch-pound units.1.6 This standard does not purport to address all of thesafety concerns,i
7、f 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:3A469/A469M Specification for Vacuum-Treated Steel
8、 Forg-ings for Generator RotorsA745/A745M Practice for Ultrasonic Examination of Aus-tenitic Steel ForgingsA788/A788M Specification for Steel Forgings,General Re-quirementsE317 Practice for Evaluating Performance Characteristics ofUltrasonic Pulse-Echo Testing Instruments and Systemswithout the Use
9、of Electronic Measurement InstrumentsE428 Practice for Fabrication and Control of Metal,Otherthan Aluminum,Reference Blocks Used in UltrasonicTestingE1065/E1065M Practice for Evaluating Characteristics ofUltrasonic Search Units2.2 Other Document:4Recommended Practice for Nondestructive Personnel Qua
10、li-fication and Certification SNT-TC-1A,(1988 or later)3.Terminology3.1 Definitions:3.1.1 indication levels(clusters),nfive or more indica-tions in a volume representing a 2-in.50-mm or smaller cubein the forging.3.1.2 individual indications,nsingle indications showinga decrease in amplitude as the
11、search unit is moved in anydirection from the position of maximum amplitude and whichare too small to be considered traveling or planar.3.1.3 planar indications,nindications shall be consideredcontinuous over a plane if they have a major axis greater than1 in.25 mm or twice the major dimension of th
12、e transducer,whichever is greater,and do not travel.1This practice 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 Sept.1,2016.Published September
13、 2016.Originallyapproved in 1955.Last previous edition approved in 2016 as A388/A388M 16.DOI:10.1520/A0388_A0388M-16A.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-388/SA-388M in Section II of that Code.3For referenced ASTM standards,visit the ASTM website,www.
14、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 fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http
15、:/www.asnt.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 3.1.4 traveling indications,ninductions whose leadingedge moves a distance equivalent to 1 in.25 mm or more of
16、metal depth with movement of the transducer over the surfaceof the forging.4.Significance and Use4.1 This practice shall be used when ultrasonic inspection isrequired by the order or specification for inspection purposeswhere the acceptance of the forging is based on limitations ofthe number,amplitude,or location of discontinuities,or acombination thereof,which give rise to ultrasonic indications.4.2 The ultrasonic quality level shall be clearly stated asorder requirements.5.Ordering Information
