GOST-22727-1988-ENG.pdf
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1、 USSR STATE STANDARD ROLLED SHEETS METHODS OF ULTRASONIC INSPECTION GOST 22727-88 Official Edition English Version Approved by Interstandard USSR STATE COMMITTEE FOR STANDARDS Moscow Copyright Gosudarstvennye Standarty State Standard GOST (Russian) Provided by IHS under license with GOST iew_jsp.cla
2、Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 08/11/2008 20:11:55 MDTNo reproduction or networking permitted without license from IHS -,-,- GOST 22727-88 1 UDC 669.14-413:006.354 Group 09 USSR STATE STANDARD ROLLED SHEETS Methods of ultrasonic inspection OKSTU (All-Union Classif
3、ication Code of Standards and Specifications) 0909 GOST 22727-88 Period of validity from 01.07.89 to 01.07.94 Failure to comply with this Standard will result in legal proceedings This Standard applies to echo method, shadow method, complete-penetration echo method and multiple-shadow method in comb
4、ination with shadow method, as well as the echo method in combination with mirror-shadow method, which are used for the ultrasonic inspection of rolled sheets made from carbon and alloyed steels, including two- layer steel, with a thickness from 0.5 to 200 mm and which are performed for detecting me
5、tal discontinuities such as stratification, congestions of non-metallic inclusions, laps and clad-layer separation and determining of their conditional or equivalent sizes. This Standard does not apply to the methods of ultrasonic inspection used for identifying the type, orientation and other true
6、characteristics of defects. The necessity of performing the ultrasonic inspection, as well as the method and volume of tests shall be indicated in the specifications for rolled metal products. The terms and definitions used in this Standard are given in Appendix 1. The characteristics of ultrasonic
7、inspection methods are given in Appendix 2. 1. EQUIPMENT Ultrasonic detectors, whose parameters and technical data comply with the requirements of GOST 23049-84 for detectors of types and and which are provided with piezo-electric or electromagnetic-acoustic converters, as well as other ultrasonic i
8、nspection devices certified by the established procedure. Official Edition Reprinting is prohibited Standards Publishing House, 1988. Copyright Gosudarstvennye Standarty State Standard GOST (Russian) Provided by IHS under license with GOST iew_jsp.claLicensee=IHS Employees/1111111001, User=Japan, IH
9、S Not for Resale, 08/11/2008 20:11:55 MDTNo reproduction or networking permitted without license from IHS -,-,- GOST 22727-88 2 Reference specimens shall be in accordance with Appendix 3. ARD-charts. Auxiliary devices for holding parameters when scanning and determining the characteristics of detect
10、ed discontinuities. 2. PREPARATION FOR INSPECTION PERFORMANCE 2.1. The preparation for inspection performance shall be carried out in the following sequence: evaluating visually the surface condition of rolled metal products; checking up the operation of mechanical and automatic equipment; checking
11、up the sensitivity set-up for inspection performance. 2.2. The surface of a rolled sheet, over which the converter moves, shall be cleaned from dirt, flaking scale, sliver and metal splashes. If the unsatisfactory surface quality of rolled sheet prevents performing inspection with the required sensi
12、tivity, an additional treatment of surface shall be carried out (shotblasting, abrasive and chemical treatment, etc.). 3. PROCEDURE OF INSPECTION PERFORMANCE 3.1. The inspection shall be carried out in compliance with the technical documentation developed in compliance with GOST 20415-82. 3.2. When
13、performing inspection, a rolled sheet shall be scanned with one or several converters. The parameters of scanning shall be indicated in the technical documentation for inspection performance. When moving the converter by hand and determining the characteristics of detected discontinuities, it is per
14、mitted to apply equipment without the auxiliary devices intended for holding parameters of scanning. 3.3. When applying echo and complete-penetration echo methods within the given time period, one or several echo pulses from discontinuities, whose amplitude, even one, is equal or exceeds the level a
15、ppropriate to the given sensitivity, shall be registered. 3.4. When applying shadow or multiple-shadow methods, the amplitude of first or nth pulse, which passed through the rolled sheet, decreased to or below the level appropriate to the given sensitivity, shall be registered. 3.5. When applying th
16、e mirror-shadow method, the amplitude of bottom signal decreased to or below the level appropriate to the given sensitivity shall be registered. Copyright Gosudarstvennye Standarty State Standard GOST (Russian) Provided by IHS under license with GOST iew_jsp.claLicensee=IHS Employees/1111111001, Use
17、r=Japan, IHS Not for Resale, 08/11/2008 20:11:55 MDTNo reproduction or networking permitted without license from IHS -,-,- GOST 22727-88 3 4. ESTIMATION AND MAKE-OUT OF INSPECTION RESULTS 4.1. The main controllable characteristics of rolled sheet continuity are: inspection sensitivity defined by the
18、 parameters of sensitivity registration as specified in tab. 2 of Appendix 2; conditional area of discontinuities: minimum non-negligible area (S1, cm2) and maximum permissible area (S2, cm2); conditional area of maximum permissible discontinuity zone (S3, m2); relative conditional area (S, percents
19、) defined as the area share, which is taken up by discontinuities of all kinds (S1 S2 and S3), per any square surface segment of rolled sheet piece with the area of 1 m2 or as the area share, which is taken up by discontinuities of all kinds, per the surface of rolled sheet piece; maximum permissibl
20、e conditional extension of discontinuities (L, mm). If the width of controllable rolled sheet is less than 1000 mm, a rectangle with the area of 1 m2, whose smaller side is equal to the width of rolled metal product, shall be taken instead of square, when determining the relative conditional area. T
21、wo sides of a square or rectangle shall be parallel to lateral edges of rolled sheet. 4.2. The continuity of rolled sheet made from steels melted in vacuum arc or inductance furnaces or melted with addition of special remelts (, , etc.), when inspected by echo method with manual scanning, may (under
22、 the agreement between the manufacturer and the consumer) be characterized by the results of detecting: minimum non-negligible equivalent size of discontinuities D0, mm; maximum permissible equivalent size of discontinuities D1, mm; number N of non-extended discontinuities with an equivalent size fr
23、om D0 to D1, which are allowed over the whole area of rolled sheet piece or its part. The parameters of continuity shall be indicated in the specifications and technical documentation for particular products and values D0 and D1 shall be selected from series: 2.0; 2.5; 3.0; 5.0; 6.0 and 8.0 mm. 4.3.
24、 It is permitted to introduce additional estimation parameters, for example, the minimum distance between the conditional boundaries of single discontinuities, number of discontinuities over the whole area of rolled sheet piece or its part, etc. that are provided for in the specifications and techni
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