Electrolytic Tinplate£¨ETP£©
- Production Process
- Product Features
- Surface Inspection Items
Control Items in the ETP Manufacturing Process
Steelmaking: Chemical composition, minimization of inclusions
Hot rolling: Finishing temperature, coiling temperature, gage profile, convexity
Cold rolling: Gage, shape, stains
Annealing: Annealing temperature, soaking temperature, cooling temperature, atmospheric gas composition
Temper rolling: plate shape, surface roughness, yield platform elimination
Double reduce cold rolling: plate thickness, shape, surface roughness, stains
Electrolytic plating: coating thickness, oiling, width, surface quality
Cutting: length tolerance, out-of-squareness (diagonal difference), stacking, burrs
ETP Product Quality Management Items
| Item | Control Items |
|---|---|
| Mechanical Properties | Hardness, yield strength, tensile strength |
| Dimensional Accuracy | Thickness, width, cut length |
| Plate Shape Parameter | Bowness (C warp, L warp), camber, askewness, edge waviness |
| Corrosion Resistance |
Tin coating (for ETP and alloy layer), metallic chromium and chromium oxide (for ETP), alloy-tin couple (ATC) (for tinplates), iron solution value (ISV), tin crystallite size (TCS), sulfur
blackening resistance, porosity, pickling lag value (PLV) |
| Paintability & Printability | Oil type, film thickness, passivation method, passivation process, passivation amount, smudge, surface stains |