Sliding characteristics – Workability
Sliding characteristics
Having a coating layer with high surface hardness and smoothness, ZAM® exhibits superior sliding characteristics.
Dynamic friction coefficients of various types of coated steel
Sliding test conditions
| Sample size | 0.8 mm (thickness) x 30 mm(width) x 300 mm (length) |
| Press oil | Z5 (Idemitsu Kosan) |
| Pressing pressure | 0.72、1.45、2.90N/mm2 |
| Pressing force | 1、2、4kN |
| Pressing area | 46×30mm2 |
| Withdrawal rate | 1000mm/min |
| Mold surface roughness | #1000 (Polishing for each session) |
| Mold material | SKD11 |
Workability
ZAM® has better drawing characteristics than other types of coated steel sheets.
Limiting drawing ratios (LDRs) of various types of coated steel sheets
Conditions for deep drawing test
| Diameter of punch (Dp) | 40mm |
| Diameter of die (Dd) | 42mm |
| Shoulder radius of punch (Rp) | 5mm |
| Shoulder radius of die (Rd) | 5mm |
| Stroke speed (Vp) | 60mm/min |
| Press forming oil | Z5 (Idemitsu Kosan) |
Samples
| Coating mass | Material | Post-treatment | |
|---|---|---|---|
| ZAM® | 70/70 g/m2 | Deep drawing quality | ZC treatment |
| Galvanized steel | 60/60 g/m2 | Deep drawing quality | ZC treatment |
| Galvanealed steel | 45/45 g/m2 | Deep drawing quality | ZC treatment |
Nguồn: Nippon Steel