<Reference> Hardness of the coating layer (Vickers hardness (HV) measurement examples)
| ZAM™ | 140〜160 |
| 55% Al-Zn alloy coated | 100〜110 |
| Zn-5% Al alloy coated | 80〜100 |
| Galvanized steel | 55〜65 |
Scratch resistance of the coating layer
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.
Scratch resistance of various types of coated steel sheets (scratch test)
Scratch load measurement conditions
| Testing needle material | Sapphire |
| Testing needle tip radius | 0.05mm |
| Load | 0.0196〜0.196N(2〜20gf) |
| Travel distance | 20mm |
・The surface was visually examined for any
scratching.
・The minimum load that produced scratching was taken as the scratching load.
・The minimum load that produced scratching was taken as the scratching load.