ASTM_A_578_-_A_578M_-_07_2012.pdf

Designation:A578/A578M07(Reapproved 2012)Standard Specification forStraight-Beam Ultrasonic Examination of Rolled Steel Platesfor Special Applications1This standard is issued under the fixed designation A578/A578M;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.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This specification2covers the procedure and acceptancestandards for straight-beam,pulse-echo,ultrasonic examina-tion of rolled carbon and alloy steel plates,38in.10 mm inthickness and over,for special applications.The method willdetect internal discontinuities parallel to the rolled surfaces.Three levels of acceptance standards are provided.Supplemen-tary requirements are provided for alternative procedures.1.2 Individuals performing examinations in accordance withthis specification shall be qualified and certified in accordancewith the requirements of the latest edition of ASNT SNT-TC-1A or an equivalent accepted standard.An equivalentstandard is one which covers the qualification and certificationof ultrasonic nondestructive examination candidates and whichis acceptable to the purchaser.1.3 The values stated in either SI units 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.1.4 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:3A263 Specification for Stainless Chromium Steel-Clad PlateA264 Specification for Stainless Chromium-Nickel Steel-Clad PlateA265 Specification for Nickel and Nickel-Base Alloy-CladSteel Plate2.2 ANSI Standard:4B 46.1 Surface Texture2.3ASNT Standard:5SNT-TC-1A3.Ordering Information3.1 The inquiry and order shall indicate the following:3.1.1 Acceptance level requirements(Sections 7,8,and 9).Acceptance Level B shall apply unless otherwise agreed to bypurchaser and manufacturer.3.1.2 Any additions to the provisions of this specification asprescribed in 5.2,13.1,and Section 10.3.1.3 Supplementary requirements,if any.4.Apparatus4.1 The amplitude linearity shall be checked by positioningthe transducer over the depth resolution notch in the IIW orsimilar block so that the signal from the notch is approximately30%of the screen height,and the signal from one of the backsurfaces is approximately 60%of the screen height(two timesthe height of the signal from the notch).A curve is then plottedshowing the deviations from the above established 2:1 ratiothat occurs as the amplitude of the signal from the notch israised in increments of one scale division until the backreflection signal reaches full scale,and then is lowered inincrements of one scale division until the notch signal reachesone scale division.At each increment the ratio of the twosignals is determined.The ratios are plotted on the graph at theposition corresponding to the larger signal.Between the limitsof 20 and 80%of the screen height,the ratio shall be within10%of 2:1.Instrument settings used during inspection shallnot cause variation outside the 10%limits established above.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.11 on Steel Plates for Boilers and Pressure Vessels.Current edition approved March 1,2012.Published March 2012.Originallyapproved in 1967.Last previous edition approved in 2007 as A578/A578M 07.DOI:10.1520/A0578_A0578M-07R12.2For ASME Boiler and Pressure Vessel Code applications,see related Specifi-cation SA-578/SA-578M in Section II of that Code.3For 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.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Available fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http:/www.asnt.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1Copyright by ASTM Intl(all rights reserved);4.2 The transducer shall be 1 or 118in.25 or 30 mm indiameter or 1 in.25 mm square.4.3 Other search units may be used for evaluating andpinpointing indicat