A Flattening Optimization Method for Eliminating Edge Creases
An optimization method and leveling technology, applied in the direction of elongation control, rolling force/roll gap control, etc., can solve the problems of low rolling pressure at the edge of the strip, folding and printing at the edge of the low-carbon aluminum killed steel plate, etc. The effect of improving product quality
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Embodiment 1
[0015] The chemical composition of the low-carbon aluminum-killed steel cold-rolled sheet is (wt%): C: 0.07, Si: 0.20, Mn: 0.40, P: ≤0.020, S: ≤0.015, N ≤ 0.006, Al: 0.07, The rest is Fe and unavoidable impurities. The cold-rolled low-carbon aluminum-killed steel sheet is smelted and cast, and then hot-rolled, pickled, cold-rolled and bell annealed. When eliminating edge creases, the low-carbon aluminum-killed steel cold-rolled steel strip head speed-up stage (when 200mpm) adopts constant rolling force control, rolling force 1800KN, control elongation rate target value + 0.2%, and adopts negative bending Control Strategy. The constant elongation control mode is adopted in the cold-rolled strip of low-carbon aluminum-killed steel. Reduce the speed of the low-carbon aluminum-killed steel cold-rolled strip tail to about 200mpm, and when the uncoiler has 100m remaining, cancel the constant elongation control and put into constant rolling force control. The rolling force is 1800K...
Embodiment 2
[0017] The chemical composition of the low-carbon aluminum-killed steel cold-rolled sheet is (wt%): C: 0.01, Si: 0.01, Mn: 0.05, P: ≤0.020, S: ≤0.015, N ≤ 0.006, Al: 0.02, The rest is Fe and unavoidable impurities. The cold-rolled low-carbon aluminum-killed steel sheet is smelted and cast, and then hot-rolled, pickled, cold-rolled and bell annealed. When eliminating edge creases, the low-carbon aluminum-killed steel cold-rolled steel strip head speed-up stage (when 30mpm) adopts constant rolling force control, rolling force 1500KN, control elongation rate + 0.2% of target value, and adopts negative bending Control Strategy. The constant elongation control mode is adopted in the cold-rolled strip of low-carbon aluminum-killed steel. Reduce the speed of the low-carbon aluminum-killed steel cold-rolled strip tail to about 200mpm, and when the uncoiler has 100m remaining, cancel the constant elongation control and put into constant rolling force control. The rolling force is 150...
Embodiment 3
[0019] The chemical composition of the low-carbon aluminum-killed steel cold-rolled sheet is (wt%): C: 0.05, Si: 0.10, Mn: 0.20, P: ≤0.020, S: ≤0.015, N ≤ 0.006, Al: 0.04, The rest is Fe and unavoidable impurities. The cold-rolled low-carbon aluminum-killed steel sheet is smelted and cast, and then hot-rolled, pickled, cold-rolled and bell annealed. When eliminating edge creases, the low-carbon aluminum-killed steel cold-rolled steel strip head speed-up stage (when 100mpm) adopts constant rolling force control, rolling force 1600KN, control elongation rate + 0.2% of the target value, and adopts negative bending Control Strategy. The constant elongation control mode is adopted in the cold-rolled strip of low-carbon aluminum-killed steel. Reduce the speed of the low-carbon aluminum-killed steel cold-rolled strip tail to about 200mpm, and when the uncoiler has 100m remaining, cancel the constant elongation control and put into constant rolling force control. The rolling force i...
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