Tin Free Steel£¨TFS£©
- Production Process
- Product Features
- Surface Inspection Items
Control Items in the TFS 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: metallic chromium amount, oiling amount, width, chromium oxide amount
Cutting: length tolerance, out-of-squareness (diagonal difference), stacking, burrs
TFS Product Quality Control Items
| Mechanical Properties | Hardness, yield strength, tensile strength |
| Dimensional Accuracy | Thickness, width, cut length |
| Plate Shape Parameters | Bowness (C warp, L warp), camber, askewness, edge waviness |
| Corrosion Resistance | Metallic chromium amount, chromium oxide amount |
| Paintability & Printability |
Oil type, film thickness, passivation method, passivation
process, passivation film thickness, smudge, surface stains |