ISO-11971-1997.pdf
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1、INTERNATIONAL STANDARD IS0 11971 First edition 1997-12-15 Visual examination of surface quality of steel castings Examen vkuel de / a=400net; p=iso; o=isocs; sxentral Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NA
2、SA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 02:48:19 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 11971 :1997(E) Visual examination of surface quality of steel castings 1 Scope 1 .l This International Standard covers th
3、e acceptance criteria for the surface inspection of steel castings by visual examination. 1.2 Acceptance levels utilize Bureau de Normalisation des Industries de la Fonderie (BNIF)t) and Steel Castings Research and Trade Association (SCRATA)2) reference comparators for the visual determination of su
4、rface roughness, and surface discontinuities described as follows: - surface roughness - thermal dressing - mechanical dressing - nonmetallic inclusions - gas porosity - fusion discontinuities - expansion discontinuities - metal inserts 1.3 Description of terms related to casting discontinuities are
5、 given in annex A. 2 Ordering information The inquiry and order should specify the following information: - extent of casting surfaces to be examined; - number of castings to be examined; - acceptance level - More than one acceptance level may be specified for different surfaces of the same casting;
6、 - if any types of discontinuities are unacceptable. 1) BNIF reference comparators may be purchased from: Editions Techniques des Industries de la Fonderie, 44, avenue de la Division Leclerc, 92310 Sevres Cedex, BP 78, France or from Steel Founders Society of America, 455 State street, Des Plaines,
7、IL 60016, USA. 2) SCRATA reference comparators may be purchased from: Castings Development Centre, 7 East Bank Road, Sheffield, S2 3PT, United Kingdom, or from Steel Founders Society of America, 455 State street, Des Plaines, IL 60016, USA. 1 Copyright International Organization for Standardization
8、Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 02:48:19 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 11971: 1997(E) 0 IS0 3 Acceptance standards Table 1 lists BNIF and SCRATA comparators for surface ro
9、ughness and gives the equivalency between BNIF and SCRATA comparators for surface roughness, mechanical dressing and thermal dressing. Table 2 lists the SCRATA surface discontinuity comparators. Levels of acceptance for surface roughness and discontinuities may be specified by the customer. Tables 3
10、 and 4 may be used by the customer when guidance is required. Surface discontinuities not covered by this International Standard shall be a matter of agreement between the purchaser and manufacturer. Table 1 - BNIF and SCRATA surface roughness and dressing comparators Roughness Mechanical dressing T
11、hermal dressing BNIF SCRATA BNIF SCRATA BNIF SCRATA Smoothest 3lOSl - 1 /OS2 - - Gl A 2IOSl - lS2 - lS3 G2 l/OS1 - 5S2 HI 2S3 G3 1 Sl Al H3 3s3 G5 2 Sl A2 H4 3 si A3 H5 4 Sl - 5 Sl - 6 Sl A4 V 7 Sl - Roughest a so A5 Table 2 - SCRATA surface discontinuity comparators Inclusions Gas Porosity Fusion d
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