A578/A578M - 17 Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Platesfor Special Applications

Designation: A578/A578M - 17 Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Platesfor Special Applications1 1. Scope@ 1.1 This specification2covers the procedure and acceptancestandards for straight-beam. pulse-echo，ultrasonic examina-tion of rolled carbon and alloy steel plates.3%s in. [10 mm] inthickness and over, for special applications.The method willcetect internal discontinuitics parallel to the rolled surfaces.Three levels of acceptance standards are provided. Supplemen-nary 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. 1.3The values stated in either Sl units or inch-pound unitsare to be regarded separately as standard. The values staled ineach system may not be exact equivalents: therefore.eachsystem shall be used independently of the other. Combiningvalucs from the two systems may result in non-conformancewith the standard. 1.4 This standard does nor puarport to address all of thesafety contcernas. if ary. associated wirh irs sese. Iis rhere sponsibility of the user of this siandard to establisis appro-priate sefety，healrh, and erivirornevral practices and deter-oeraize rhe applicabiliry of re gulatory liirarions prior o use. 1.5 This inrernacational siandcrd was developed inx accor-darce with inferrictionally recognized principles om srandcrd-ization established in the Decisiow on Principles for theDevelopnenr of Inxrerncational Standarcls，Gides and Recon-menderiors issued by the World Trade Organizavion TechunicalBarriers ro Trade (TBT) Conitsee.