ISO 11971:2020 pdf download – Steel and iron castings —— Visual testing of surface quality.
1.1 This document coven, the a-ceptance criteria for the visual testing of the surface of steel and iron
1.2 Acceptance levels utilize Bureau tic Normalisation des Industries de Ia Fondene KNIFE and Steel
Castings Research and Trade Association ISCRATA) or Casting Technology International ICTIJ reference
comparators for the visual determination of surface roughness and surface discontinuities described as
— surface roughness:
– thermal dressing;
mechanical dressing:
non-metallic inclusions;
gas porosity;
fusion discontinuities:
expansion discontinuities:
metal inserts.
I Normatlir Rcfervnces
There arc no normative references in this document.
3 Terms and Definitions
No ternis and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardtiation at the following addresses:
ISO Online browsing platform: available athttps:!’wwvwisoorgobp
IEC Electropedia: available at hnp:I/www.electropedia,orgi 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:
c) 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.
S Test methud
The area to be tested shall he esammed without opucal aids esceeding lx magnilication.
The comparators define the worst or roughest condition for thai acceptance lesci. 6 Acseptance crftcrla
al The SCRATA comparator set is used for steel at irOn castings.
hi The BNIF comparator set SI and S2 categories can he used for all alloys. Category S3 is used for steel castings only.
Tahki lists KNIF and SCRATA comparators for surface roughness and gives the equivalency hctween 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 he specified by the cusIoiner. In Annc A. Talilc A.! and fable A,2 give guidance on optional roughness acceptance and surface discontinuity acceptance.
Surface discontinuities not covered by this tksument shall he a matter of agreement between the purchaser 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 testresults 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 catcgory and level of cach area tested for the surface condition;e)date of the testing.