1.Construction of New Hot Strip Mill
Evaluation of Mill Type depending on Product-Mix
Thin Slab Caster
Medium Slab Caster
Compact H.S.M.
Big Production H.S.M.
New technologies for New MillMedium Slab Caster
Compact H.S.M.
Big Production H.S.M.
2.Modernization of Hot Strip Mill
Feasibility study of modernization
Effective order of investment for modernization
Individual new technologies for modernization
Effective order of investment for modernization
Individual new technologies for modernization
3.Increased Productivity
Effective investment to increase productivity
Optimum rolling cycle to increase productivity
Increased operating ratio, reduce cobbles and others
Increased productivity
Optimum rolling cycle to increase productivity
Increased operating ratio, reduce cobbles and others
Increased productivity
4.Cost reduction
| Increased yield | Decreased scale loss Decreased cobbles Decreased secondary coils Decreased scrap loss at both ends of strip Decreased trimmed loss at picklers and finishing lines Others |
| Decreased fuel consumption | Decreased slab reheating temperature |
5.Optimum hot rolling operation for special use steel
| Tin plate | Profile, Temperature, Counter measure against breakage in cold rolling |
| High carbon steel | Red scale, Crown, Breakage and/or crack, Roll mark, CT |
| Stainless steel | Edge seam, Surface defects, Crown |
| Automotive use | Surface defects (Rolling condition in ultra low carbon steel) |
| Pickled & oiled thin gauge | Rolled in scale, ripped tail, pincher mark |
6.Quality improvement / Reduced Secondary Coil
Rolled in scale (Eleven kinds of them), Rolled-in-scale-like defects after cold rolled
Scab (originated from HSM or Steel Making), Edge scab, Edge seam
Edge crack, Edge lamination
Pit, White spot mark
Roll mark (Several kinds of them)
Pincher, Ripped tail
Scratch (incl. special very small one which is not allowed for automotive use)
Telescope, Top mark, Scale-like squeezed defect at both ends
Rolled in foreign body (from big one to fine one that changed to defect at tin mill)
Thickness, Width, Crown, Edge drop
Collapsed coil, Coil break, Others
Scab (originated from HSM or Steel Making), Edge scab, Edge seam
Edge crack, Edge lamination
Pit, White spot mark
Roll mark (Several kinds of them)
Pincher, Ripped tail
Scratch (incl. special very small one which is not allowed for automotive use)
Telescope, Top mark, Scale-like squeezed defect at both ends
Rolled in foreign body (from big one to fine one that changed to defect at tin mill)
Thickness, Width, Crown, Edge drop
Collapsed coil, Coil break, Others
7.Crown reduction of stainless steel
Reductrion to under 40µm at edge 40mm by taper work roll shifting
8.Pickler’s quality issue for cold rolling
| Edge crack |  |
Trimming procedure and inspection |
| Breakage at weld point | |
Welder Control and inspection Post annealing |
| General Breakage | |
Surface defects Scab, scratch |