1、Designation:A898/A898M17Standard Specification forStraight Beam Ultrasonic Examination of Rolled SteelStructural Shapes1This standard is issued under the fixed designation A898/A898M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,th
2、e 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 specification covers the procedure and acceptancestandards for straight beam,pulse echo,ultrasonic examina
3、tionof rolled structural shapes having a minimum section thicknessof12in.12.5 mm.It was developed to ensure delivery of steelstructural shapes free of gross internal discontinuities such aspipe,ruptures,or laminations and is to be used whenever theinquiry,contract,order,or specification states that
4、the shapesare to be ultrasonically examined.Two levels of acceptancestandards are included.Level II is intended for normal appli-cations where freedom from gross internal discontinuities isdesired,particularly in connection regions.Level I is intendedfor critical applications such as welded chord me
5、mbers used intension loading,where internal discontinuities could be detri-mental.Level II is normally applicable unless otherwisespecified in contract documents or the purchase order.Supple-mentary requirements for alternative scanning coverages areprovided.1.2 The values stated in either inch-poun
6、d or SI units are tobe regarded separately as standard.Within the text,the SI unitsare shown in brackets.The values stated in each system are notexact equivalents;therefore,each system must be used inde-pendently of the other.Combining values from the two systemsmay result in nonconformance with the
7、 specification.1.3 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 Techni
8、calBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars,Plates,Shapes,and Sheet PilingE317 Practice for Evaluating Performance Characteristics ofUltrasonic Pulse-Echo Testing Instruments and Systemswit
9、hout the Use of Electronic Measurement Instruments2.2 ASNT Standard:3SNT-TC-1A Recommended Practice for Personnel Qualifi-cation and Certification in Nondestructive Testing33.Ordering Information3.1 The inquiry and order should indicate the following:3.1.1 Acceptance level requirements will be Level
10、 II unlessotherwise specified.3.1.2 Any additions to the provisions of this specification asoutlined in 8.3.3.1.3 Supplementary requirements,if any.4.Apparatus4.1 The manufacturer or organization performing the ex-amination shall furnish suitable ultrasonic equipment andqualified personnel necessary
11、 for performing the examination.The equipment shall be straight beam,pulse-echo and span anominal test frequency range of 1 to 5 MHz.The search unitshall be within the range of12in.12.5 mm to 118in.30 mmin diameter or1212.5 mm to 1 in.25 mm square(includingthe pitch-catch type probe).The test shall
12、be performed by oneof the following methods:contact,immersion,or liquid columncoupling.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.02 on Structural Steel for Bridges,Buildings,Roll
13、ing Stock and Ships.Current edition approved March 15,2017.Published May 2017.Originallyapproved in 1990.Last previous edition approved in 2012 as A898/A898M 07(2012).DOI:10.1520/A0898_A0898M-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at ser
14、viceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http:/www.asnt.org.*A Summary of Changes section ap
15、pears 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
16、 for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.2 Other search units may be used for evaluating andpin-pointing indications.NOTE1Refer to Practice E317 to evaluate performance characteristicsof the apparatus system.5.Personnel Qualification5.1 Individuals performing examinations in accordance withthis specification shall be qualified and certified in accordancewith the requirements of t
