ASTM A898 A898M-2007(2012) Standard Specification for Straight Beam Ultrasonic Examination of Rolled Steel Structural Shapes 《轧制结构钢型材的直束超声检验标准规范》.pdf
《ASTM A898 A898M-2007(2012) Standard Specification for Straight Beam Ultrasonic Examination of Rolled Steel Structural Shapes 《轧制结构钢型材的直束超声检验标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM A898 A898M-2007(2012) Standard Specification for Straight Beam Ultrasonic Examination of Rolled Steel Structural Shapes 《轧制结构钢型材的直束超声检验标准规范》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A898/A898M 07 (Reapproved 2012)Standard 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 t
2、he 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. Scope1.1 This specification covers the procedure and acceptancestandards for straight beam, pu
3、lse echo, ultrasonic examinationof rolled structural shapes having a minimum section thicknessof12 in. 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,
4、order, or specification states that 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 criti
5、cal applications such as welded chord members 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 areprovide
6、d.1.2 The values stated in either inch-pound 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
7、 two systemsmay result in nonconformance with the specification.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 Characteristicsof Ultrasonic Pulse-Echo T
8、esting Instruments and Systemswithout 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 Acceptanc
9、e level requirements will be Level 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 shall furnish suitable ultrasonicequipment and qualified personnel necessary for per
10、formingthe examination. The equipment shall be straight beam, pulse-echo and span a nominal test frequency range of 1 to 5 MHz.The search unit shall be within the range of12 in. 12.5 mm to118 in. 30 mm in diameter or12 12.5 mm to 1 in. 25 mmsquare (including the pitch-catch type probe). The test sha
11、ll beperformed by one of the following methods: contact, immer-sion, or liquid column coupling.4.2 Other search units may be used for evaluating andpin-pointing indications.5. Personnel Qualification5.1 Individuals performing examinations in accordance withthis specification shall be qualified and c
12、ertified in accordancewith the requirements of the latest edition of ASNT SNT-TC-1A or an equivalent accepted standard. An equivalentstandard is one that covers the qualification and certification ofultrasonic nondestructive examination candidates, and that isacceptable to the purchaser.6. Test Cond
13、itions6.1 Conduct the examination in an area free of operationsthat interfere with proper functioning of equipment and testingpersonnel.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.
14、02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.Current edition approved March 1, 2012. Published April 2012. Originallyapproved in 1990. Last previous edition approved in 2007 as A898/A898M 07.DOI: 10.1520/A0898_A0898M-07R12.2For referenced ASTM standards, visit the ASTM webs
15、ite, 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 fromAmerican Society for Nondestructive Testing (ASNT), P.O. Box28518, 1711 Arlingate Ln., Columbus,
16、OH 43228-0518, http:/www.asnt.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 The section surfaces shall be sufficiently clean andsmooth to maintain a back reflection from the opposite side ofthe flanges, legs, and webs appro
17、ximately comparable to theheight observed at the scanning gain level obtained in 8.2.6.3 The surfaces of the shapes inspected by this method maybe expected to contain a residue of oil or rust or both. Anyspecified identification that is removed when grinding as aresult of surface preparation or exam
18、ination shall be restored.7. Calibration7.1 Standards having14 in. 6 mm diameter flat bottomedholes are used for calibration. The metal distance between thehole bottom and sound entry surface in relation to sectionthickness is given in Table 1.7.2 Standards shall be obtained from a rolled structural
19、shape or plate having surface conditions and acoustic proper-ties similar to that of the product being inspected.8. Test Method8.1 Ultrasonic examination shall be made on the majorsurface of each flange and one major web surface. Evaluationof indications may require inspection from an opposite surfa
20、ce.8.2 The reference level sensitivity shall be established byadjusting the maximum response obtained from the flat-bottomed hole between 50 and 80 % of full screen scale. Whenscanning, the gain level shall be increased to at least twice thereference level sensitivity as measured on the cathode ray
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