ASTM A388A388M-2003大型钢锻件超声波检测的标准实施规程英文

Designation:A388/A388M–03Used in USNRC-RDT standards

An American National Standard

Standard Practice for

Ultrasonic Examination of Heavy Steel Forgings1

This standard is issued under thefixed designation A388/A388M;the number immediately following the designation indicates the year

of 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(e)indicates an editorial change since the last revision or reapproval.

1.Scope*

1.1This practice2covers the examination procedures for the contact,pulse-echo ultrasonic examination of heavy steel forgings by the straight and angle-beam techniques.The straight beam techniques include utilization of the DGS(Dis-tance Gain-Size)method.See Appendix X3.

1.2This practice is to be used whenever the inquiry, contract,order,or specification states that forgings are to be subject to ultrasonic examination in accordance with Practice A388/A388M.

1.3The values stated in either inch-pound or SI units are to be regarded as the standard.Within the text,the SI units are shown in brackets.The values stated in each system are not exact equivalents;therefore,each system must be used inde-pendently of the bining values from the two systems may result in nonconformance with the specification.

1.4This specification and the 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 furnished to inch-pound units.

1.5This standard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility 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 Documents

2.1ASTM Standards:

A469Specification for Vacuum-Treated Steel Forgings for Generator Rotors3

A745/A745M Practice for Ultrasonic Examination of Aus-tenitic Steel Forgings3

E317Practice for Evaluating Performance Characteristics

of Ultrasonic Pulse-Echo Examination Instruments and Systems Without the Use of Electronic Measurement Instruments4

E428Practice for Fabrication and Control of Steel Refer-ence Blocks Used in Ultrasonic Inspection4

2.2ANSI Standard:

B46.1Surface Texture5

2.3Other Document:

Recommended Practice for Nondestructive Personnel Quali-fication and Certification SNT-TC-1A,Supplement C—Ultrasonic Testing6

3.Ordering Information

3.1When this practice is to be applied to an inquiry, contract,or order,the purchaser shall so state and shall also furnish the following information:

3.1.1Method of establishing the sensitivity in accordance with7.2.2and7.3.3(Vee or rectangular notch),

3.1.1.1The diameter and test metal distance of theflat-bottom hole and the material of the reference block in accordance with7.2.2.2,

3.1.2Quality level for the entire forging or portions thereof in accordance with10.3,and

3.1.3Any options in accordance with6.1,6.2,and7.1.11.

4.Apparatus

4.1An ultrasonic,pulsed,reflection type of instrument shall be used for this examination.The system shall have a mini-mum capability for examining at frequencies from1to5MHz. On examining austenitic stainless forgings the system shall have the capabilities for examining at frequencies down to0.4 MHz.

4.1.1The ultrasonic instrument shall provide linear presen-tation(within5%)for at least75%of the screen height (sweep line to top of screen).The5%linearity referred to is descriptive of the screen presentation of amplitude.Instrument linearity shall be verified in accordance with the intent of

1This practice is under the jurisdiction of ASTM Committee A01on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.06on Steel Forgings and Billets.

Current edition approved April10,2003.Published June2003.Originally published as A388–st previous edition A388/A388M–01.

2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-388/SA-388M in Section II of that Code.

3Annual Book of ASTM Standards,V ol01.05.

4Annual Book of ASTM Standards,V ol03.03.

5Available from the American National Standards Institute,Inc.,25W.43rd Street,4thfloor,New York,NY10036.

6Available from the American Society for Nondestructive Testing,1711Arlin-gate Ln.,P.O.Box28518,Columbus,OH43228–0518.

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*A Summary of Changes section appears at the end of this standard. Copyright©ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.