ISO 12944-4:2017

ISO 12944-4:2017 covers the following types of surfaces of steel structures consisting of carbon or low-alloy steel, and their preparation:
-      uncoated surfaces;
-      surfaces thermally sprayed with zinc, aluminium or their alloys;
-      hot-dip-galvanized surfaces;
-      zinc-electroplated surfaces;
-      sherardized surfaces;
-      surfaces painted with prefabrication primer;
-      other painted surfaces.
ISO 12944-4:2017 defines a number of surface preparation grades but does not specify any requirements for the condition of the substrate prior to surface preparation.
Highly polished surfaces and work-hardened surfaces are not covered by ISO 12944-4:2017.