NBN ISO 11971:2021

1.1 This document covers the acceptance criteria for the visual testing of the surface of steel and iron
castings.
1.2 Acceptance levels utilize Bureau de Normalisation des Industries de la Fonderie (BNIF) and Steel
Castings Research and Trade Association (SCRATA) or Casting Technology International (CTI) reference
comparators for the visual determination of surface roughness and surface discontinuities described as
follows:
— surface roughness;
— thermal dressing;
— mechanical dressing;
— non-metallic inclusions;
— gas porosity;
— fusion discontinuities;
— expansion discontinuities;
— metal inserts.