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
