Steel plates must have a workmanlike finish and must be free from defects and imperfections which may impair their proper workability and use. This may, however, include some minor imperfections, e.g. pittings, rolled-scale, indentations, roll marks, scratches and grooves which cannot be avoided despite the proper manufacturing.
Further reading: IACS Publication No.12 Guidlines for Surface Finish of Hot Rolled Steel Plates and Wide Flats.