This part of ISO 12944 deals with 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.

This part of ISO 12944 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 this part of ISO 12944.