A kind of high-strength and high-plasticity cold-rolled steel plate and its manufacturing method
A cold-rolled steel sheet and a manufacturing method technology, which are applied in the field of high-strength and high-plasticity cold-rolled steel sheets and their manufacturing, and can solve the problems of reducing plasticity, difficulty and the like.
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Embodiment 1
[0034]Molten steel is smelted in a vacuum induction furnace, and then cast to obtain an ingot, its composition by mass percentage is: C0.35%, Mn 8.5%, Al 4.5%, Ni 4.6%, Si 0.04%, S 0.002%, P 0.002%, The balance is Fe and unavoidable impurities;
[0035] Wherein 9.6[C]+1.3[Mn]+2.2[Ni]=9.6×0.35+1.3×8.5+2.2×4.6=3.36+11.05+10.12=24.53=5.45[Al];
[0036] Heating to 1200°C and keeping it warm for 1.8h, followed by 9 passes of hot rolling, the starting and finishing temperatures were 1170°C and 875°C respectively, and air cooled to room temperature after hot rolling to obtain a 4.4mm thick hot-rolled plate; The total rolling reduction rate is 94%;
[0037] Pickling the hot-rolled sheet and then cold-rolling it to a thickness of 1.3mm to obtain a cold-rolled sheet; the total cold-rolled reduction rate is 70%;
[0038] Heat the cold-rolled sheet to 740°C and keep it warm for 13 minutes, then air-cool to room temperature to obtain an annealed sheet;
[0039] Heat the annealed plate t...
Embodiment 2
[0041] Method is with embodiment 1, and difference is:
[0042] (1) The composition of the ingot by mass percentage is: C 0.13%, Mn 6%, Al 2.3%, Ni 2.5%, Si0.05%, S 0.002%, P 0.002%;
[0043] Wherein 9.6[C]+1.3[Mn]+2.2[Ni]=9.6×0.13+1.3×6+2.2×2.5=1.25+7.8+5.5=14.55=6.3[Al];
[0044] (2) Heating to 1180°C and keeping it warm for 1.5h, followed by 10 passes of hot rolling, the starting and finishing temperatures were 1085°C and 822°C respectively, and air cooled to room temperature after hot rolling to obtain a 3.8mm thick hot rolled plate; the total reduction rate of hot rolling is 95%;
[0045] (3) cold rolling to a thickness of 0.7mm to obtain a cold rolled plate; the total reduction rate of cold rolling is 82%;
[0046] (4) Heat the cold-rolled sheet to 705°C and keep it warm for 2 minutes, then air-cool to room temperature to obtain an annealed sheet;
[0047] (5) Heat the annealed plate to 460°C and keep it warm for 55min, then air-cool to room temperature, the tensile s...
Embodiment 3
[0049] Method is with embodiment 1, and difference is:
[0050] (1) The composition of the ingot by mass percentage is: C 0.22%, Mn 7.2%, Al 3.1%, Ni 2.9%, Si0.06%, S 0.002%, P 0.002%;
[0051] Wherein 9.6[C]+1.3[Mn]+2.2[Ni]=9.6×0.22+1.3×7.2+2.2×2.9=2.11+9.36+6.38=17.85=5.8[Al];
[0052] (2) Heating to 1167°C and holding it for 1 hour, followed by 8 passes of hot rolling, with the starting and finishing temperatures being 1150°C and 840°C respectively, and air cooling to room temperature after the hot rolling to obtain a 5mm thick hot-rolled sheet; The total reduction rate of hot rolling is 93%;
[0053] (3) cold rolling to a thickness of 1 mm to obtain a cold rolled plate; the total reduction rate of cold rolling is 80%;
[0054] (4) Heat the cold-rolled sheet to 720°C and keep it warm for 10 minutes, then air-cool to room temperature to obtain an annealed sheet;
[0055] (5) Heat the annealed plate to 520°C and keep it warm for 60 minutes, then air-cool to room temperatur...
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