Mill skin
The rolling skin is a firmly adhering blue-black layer made of various iron oxides , such as hematite and magnetite, which is formed during the hot rolling of iron and steel .
It offers good protection against corrosion , but its hardness makes further processing of the steel difficult . The mostly brittle mill skin can be removed mechanically by blasting or grinding , with smaller parts also chemically by pickling . In the case of components subject to vibrations, the rolled skin is usually removed, as its rough surface roughness can cause cracks, especially in hard and thus brittle materials, and the structural strength is reduced.
Individual evidence
- ^ Georg Jacobs: Machine design . Mainz Verlag, Aachen 2015, ISBN 3-86130-748-0 , pp. 24–42.
Web links
- Pretreatment of steel surfaces (accessed June 18, 2020)
- Industrial Coatings (accessed June 18, 2020)
- Important information on powder coating (accessed on June 18, 2020)
- Pickling and passivation of stainless steels (accessed June 18, 2020)
- Process chains in the metal forming industry (accessed on June 18, 2020)