
9 SURFACE TREATMENTS / SURFACE COATINGS Surface treatment / Coating properties examples Surface Coating Hardness Thickness Coating Frict. coeff. Max. appl. temp. Color Treaments material [HV] [μm] structure against steel [°C] Conversion into the Dark grey Fe3O4 400 max. 5 – 550 ST surface Blue grey TiCN 3000 1–4 Multi-layer gradient 0.4 500 Black grey TiAlN 3300 3 Nano structured 0.3 – 0.35 900 Blue grey AlCrN 3200 – Mono-layer 0.35 1100 205