Scratch resistance of the coating layer

ZAM has a harder coating layer than hotdip galvanized or aluminum-zinc alloy coated steel sheets. Thus, ZAM® offers better scratch resistance and can be used in applications where it is subjected to scratching and repeated friction during processing.

<Reference> Hardness of the coating layer (Vickers hardness (HV) measurement examples)

ZAM®	140〜160
Hot-dip 55% Al-Zn alloy coated	100〜110
Hot-dip Zn-5% Al alloy coated	080〜100
Galvanized steel	055〜065

Scratch resistance of various types of coated steel sheets (scratch test)

Source: Nippon Steel