ISO 11971-2020 pdf free download – Steel and iron castings — Visual testing of surface quality.
1.1 This document covers the acceptance criteria for the visual testing of the surface of steel and ironcastings.
1.2 Acceptance levels utilize Bureau de Normalisation des Industries de la Fonderie (BNIF) and SteelCastings Research and Trade Association (SCRATA) or Casting Technology Internationai (CTI) referencecomparators for the visual determination of surface roughness and surface discontinuities described asfollows:
surface roughness;thermal dressing;mechanical dressing;non-metallic inclusions;gas porosity;
fusion discontinuities;expansion discontinuities;metal inserts.
2Normative References
There are no normative references in this document.
3Terms and Definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:- ISO online browsing platform: available at https://www.iso.org/obp
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4 Ordering information
The enquiry and order should specify the following information:
a) the casting areas where the surface is to be tested should be clearly indicated on the drawing or
solid model;
b)the number of castings to be tested;
the acceptance level: more than one acceptance level may be specified for different surfaces of the
same casting;
d)if any types of discontinuities are unacceptable.
5 Test method
The area to be tested shall be examined without optical aids exceeding 1x magnification.The comparators define the worst or roughest condition for that acceptance level.
6 Acceptance criteria
a) The SCRATA comparator set is used for steel or iron castings.
b)The BNIF comparator set S1 and $2 categories can be used for all alloys.Category S3 is used for
steel castings only.
Table 1 lists BNIF and SCRATA comparators for surface roughness and gives the equivalency betweenBNIF 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.In Annex A， Table A.1 and ‘Table A.2 give guidance on optional roughness acceptance and surfacediscontinuity acceptance.
Surface discontinuities not covered by this document shall be a matter of agreement between thepurchaser and manufacturer.
7 Test report
The manufacturer shall, if requested by the purchaser at the time of enquiry and order, keep a record of the test results and provide a test report.
The records of the manufacturer shall contain the following:
a) the identification of the castings;
b) the name and qualification of the person undertaking the testing;
c) the reference of the comparator used;
d) the designated category and level of each area tested for the surface condition;
e) date of the testing.ISO 11971 pdf download.