冷延鋼板用連続焼鈍設備と操業

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Cold rolled steel strips with deep drawing quality are manufactured economically by the CAPL (Continuous Annealing and Processing Line) after cold rolling. CAPL combines 5 conventional processes of electrolytic cleaning, annealing, cooling, temper rolling and recoiling with inspection into one line. Materials most suited for the purpose are low manganese steels (Mn≦0.25%) with K values of 0-0.15, which are coiled at 670℃ or above after hot rolling. The K value is defined as follows : (for capped and rimmed steels) K=Mn(%)-55/32・S(%)-55/16・O(%) (for killed steels) K=Mn(%)-55/32・S(%) These steels are cold rolled to the final thickness and then passed through the CAPL. The heat cycle of the CAPL furnace section consists of one-minute annealing, cooling to over-aging temperature at the rate of 5° to 30℃ per second and over-aging at 350° to 450℃ for a few minutes. The radius of the overaging chamber hearth roll has to satisfy the following relation ; d/R=2.02×10^<-3>-1.05×10^<-3>-log(t+1) where d : strip thickness (mm), R : radius of hearth roll (mm), t : time during which bending stress occurs (min). The built-in temper mill of CAPL has a new type of work roll changing device which enables the replacement of work rolls in 2 min without the strip having to be cut. With other new devices such as direct strip temperature detector, or strip steering device, it has become possible to combine the above 5 processes organically into one single line to reduce man-power, investment cost, energy consumption and yield loss drastically.
社団法人日本鉄鋼協会の論文
1975-10-01

冷延鋼板用連続焼鈍設備と操業

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