3D surface microtopography of cold-rolled and galvanized strip

The switch from 2D filtration to 3D filtration of surface microtopography is described. Important new surface parameters in the metallurgical industry are considered. The use of 3D parameters reveals new aspects of working-roller wear and the development of roughness at the surface of cold-rolled and galvanized auto-industry steel sheet and permits comparison of the surface roughness of coated and uncoated sheet. On that basis, the development of roughness on auto-industry steel sheet in temper rolling may be reassessed; the surface texturing of the rollers may be further improved; and the quantity of rolled metal obtained from a single pair of working rollers may be considerably increased.