The GB/T 8923.2-2008 Visual assessment of surface cleanliness of steel surface preparation before coating Part 2: Grade of treatment after partial removal of the original coating on the surface of coated steel specifies the grade of treatment after partial removal of the original coating on the surface of coated steel. The standard applies to steel surfaces that have been coated before coating by means of spray cleaning, manual and power tool cleaning, and mechanical sanding. It includes a text description of the treatment grade and a typical sample photo, indicating the surface cleanliness in terms of the visual appearance of the steel. This standard is equivalent to ISO 8501-2:1994, which is centralized by the China Shipbuilding Industry Group company, issued on April 1, 2008, and implemented on September 1, 2008.