Low-cost and high-performance SPA-H hot rolled steel coil and preparation method thereof
A hot-rolled steel coil, high-performance technology, applied in the direction of manufacturing converters, improving process efficiency, etc., to achieve the effect of improving elongation, avoiding bending cracking problems, and good surface quality
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Embodiment 1
[0051]After the composition is designed, the molten iron is pretreated, then smelted in a 180t converter, nitrogen and argon are switched, and the molten steel is tapped; blowing is performed once before tapping, and the tapping time is 5 minutes; the alloy is added before tapping 4 / 5; Double slag blocking, the slag thickness at the station is 80mm; ladle furnace making reduced slag operation, the processing time is 18 minutes, and the ladle is weakly blown with Ar (bright circle ≤ 200mm) for 6 minutes before the processing is completed; the ladle furnace processing is completed and the continuous casting ladle is poured for 12 minutes .
[0052] The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.07%, Si 0.25%, Mn 0.38%, P 0.085%, S 0.006%, Cu 0.25%, Ni 0.08%, Cr 0.50%, Als 0.015% ; The rest is iron and unavoidable impurities.
[0053] The molten steel is continuously cast to obtain a slab, in which the liquidus temp...
Embodiment 2
[0058] After the composition is designed, the molten iron is pretreated, then smelted in a 180t converter, nitrogen and argon are switched, and the molten steel is tapped; the blowing is done once before tapping, and the tapping time is 6 minutes; the alloy is added before tapping 4 / 5; Double slag blocking, the slag thickness at the station is 80mm; the ladle furnace makes the reduced slag operation, the processing time is 20 minutes, and the ladle is weakly blown with Ar (bright circle ≤ 200mm) for 8 minutes before the end of the treatment; the time from the end of the refining treatment to the opening of the continuous casting ladle is 15 minutes.
[0059] The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.08%, Si 0.30%, Mn 0.43%, P 0.090%, S 0.004%, Cu 0.27%, Ni 0.09%, Cr 0.55%, Als 0.020% ; The rest is iron and unavoidable impurities.
[0060] The molten steel is continuously cast to obtain a slab, in which the li...
Embodiment 3
[0065] After the composition is designed, the molten iron is pretreated, then smelted in a 180t converter, nitrogen and argon are switched, and the molten steel is tapped; blowing is performed once before tapping, and the tapping time is 8 minutes; the alloy is added before tapping 4 / 5; Double slag blocking, the slag thickness at the station is 80mm; the ladle furnace makes the reduced slag operation, the processing time is 22 minutes, and the ladle is weakly blown with Ar (bright circle ≤ 200mm) for 10 minutes before the end of the treatment; the time from the end of the refining treatment to the opening of the continuous casting ladle is 20 minutes.
[0066] The weight percentages of the components of the above-mentioned molten steel after tapping are as follows: C 0.095%, Si 0.35%, Mn0.48%, P 0.105%, S 0.007%, Cu 0.35%, Ni 0.20%, Cr 0.60%, Als 0.045% ; The rest is iron and unavoidable impurities.
[0067] The molten steel is continuously cast to obtain a slab, in which the ...
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