This document specifies a series of rust grades and preparation grades of steel surfaces.
This document describes the preparation grades of the substrate based on visual assessment of the initial rust grade, preparation method used and visual evaluation of the resulting degree of cleanliness.
It is applicable to hot-rolled steel surfaces prepared for painting by methods such as blast-cleaning, hand or power tool cleaning and acid pickling. These methods are primarily intended for removing firmly adhering mill scale on hot rolled steel. They can be used to remove coatings, mill scale or other firmly adhering extraneous material.
This document is also applicable to steel substrates that show residues of firmly adhering paint and other foreign matter in addition to residual mill scale.
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