A low-strength thermoformed steel coil resistant to iron sheet shedding and its preparation method
A thermoforming, low-strength technology, used in metallurgy and steel rolling, which can solve the problems of high strength and easy peeling off of surface iron.
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Embodiment 1
[0039] The preparation method of the low-strength iron sheet peeling-resistant hot-formed steel coil according to the present invention comprises:
[0040] (1) After smelting and continuous casting molten iron or scrap steel, a steel slab is obtained; wherein, the steel slab contains: C0.20%, Si 0.20%, Mn 1.10%, Alt 0.02%, B 0.002%, P 0.02%, S 0.003%, N 0.005%, the balance is iron and inevitable impurities;
[0041] (2) heating the steel slab obtained in step (1), the heating temperature is 1260°C, and the heating time is 230min;
[0042] (3) rough rolling the steel slab obtained in step (2), and the rough rolling process adopts two rolling mills for rolling, wherein the "1+5" mode or "3+3" mode is used for rolling; rough rolling The thickness of the steel slab before is 237mm; the thickness of the steel slab after rough rolling is 30mm;
[0043] (4) finish rolling the strip obtained in step (3), the temperature of finish rolling is 850 ℃; the thickness of the steel slab aft...
Embodiment 2
[0054] The preparation method of the low-strength iron sheet peeling-resistant hot-formed steel coil according to the present invention comprises:
[0055] (1) After smelting and continuous casting molten iron or scrap steel, a steel slab is obtained; wherein, the steel slab contains: C0.25%, Si 0.30%, Mn 1.50%, Alt 0.06%, B 0.004%, P 0.01%, S 0.002%, N 0.003%, the balance is iron and inevitable impurities;
[0056] (2) heating the steel slab obtained in step (1), the heating temperature is 1300°C, and the heating time is 300min;
[0057] (3) rough rolling the steel slab obtained in step (2), and the rough rolling process adopts two rolling mills for rolling, wherein the "1+5" mode or "3+3" mode is used for rolling; rough rolling The thickness of the steel slab before is 237mm; the thickness of the steel slab after rough rolling is 40mm;
[0058] (4) finish rolling the strip obtained in step (3), the temperature of finish rolling is 1100 ℃; the thickness of the steel slab af...
Embodiment 3
[0069] The preparation method of the low-strength iron sheet peeling-resistant hot-formed steel coil according to the present invention comprises:
[0070] (1) After smelting and continuous casting molten iron or scrap steel, a steel slab is obtained; wherein, the steel slab contains: C0.22%, Si 0.25%, Mn 1.30%, Alt 0.035%, B 0.0025%, P 0.012%, S0.002%, N0.004%, the balance is iron and inevitable impurities;
[0071] (2) heating the steel slab obtained in step (1), the heating temperature is 1280°C, and the heating time is 300min;
[0072] (3) rough rolling the steel slab obtained in step (2), and the rough rolling process adopts two rolling mills for rolling, wherein the "1+5" mode or "3+3" mode is used for rolling; rough rolling The thickness of the steel slab before is 237mm; the thickness of the steel slab after rough rolling is 35mm;
[0073] (4) finish rolling the strip obtained in step (3), the temperature of finish rolling is 1100 ℃; the thickness of the steel slab a...
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