Method for producing cold-rolling low-carbon aluminum killed steel with uniform through plate mechanical property
A low-carbon aluminum-killed steel and production method technology, applied in the direction of metal rolling, can solve the problems of low temperature control accuracy, affecting the normal operation of the coiler, and increasing heating costs, so as to improve the uniformity of mechanical properties and pass through the plate. The effect of uniform mechanical properties
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Embodiment 1
[0017] The molten iron is subjected to KR desulfurization treatment, full three desulfurization converter, CAS / RH scouring treatment, and then continuous casting; the slab smelting composition: C: 0.030wt%, Si: ≤0.02wt%, Mn: 0.20wt%, P : 0.007wt%, S: 0.008wt%, Alt: 0.028wt%, B: 0.0011wt%, N: 0.0030wt%, and the balance is basically Fe.
[0018] The slab is heated to 1260°C for 3.2 hours, the final rolling temperature is 920°C, and the coiling temperature is 660°C; then it is decoiled on the pickling mill, stretched, straightened, and phosphorus is broken, and then enters shallow tank turbulent flow pickling to remove its surface oxidation After the iron sheet enters the 5-stand cold tandem rolling mill, the reduction rate is 72%. Finally, the vertical continuous annealing unit is uncoiled and cleaned at the entrance and enters the vertical continuous annealing furnace. The temperature in the heating section is 740°C, and the temperature in the fast cooling section is 420 ℃, and...
Embodiment 2
[0020] The molten iron is subjected to KR desulfurization treatment, full three desulfurization converter, CAS / RH scouring treatment, and then continuous casting; the slab smelting composition: C: 0.045wt%, Si: 0.02wt%, Mn: 0.21wt%, P: 0.009 wt%, S: 0.010 wt%, Alt: 0.035 wt%, B: 0.0013 wt%, N: 0.0042 wt%, and the balance is basically Fe.
[0021] The slab is heated to 1260°C, the heating time is 3.2 hours, the final rolling temperature is 920°C, and the coiling temperature is 660°C; then it is uncoiled on the acid rolling unit, stretched, straightened, and phosphorus is broken, and then enters a shallow tank for turbulent pickling to remove its surface After the oxidized iron scale enters the 5-stand cold tandem rolling mill, the reduction rate is 72%. Finally, the vertical continuous annealing unit is uncoiled and cleaned at the entrance and enters the vertical continuous annealing furnace. The temperature in the heating section is 740 ° C, and the temperature in the fast cool...
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