A preparation method of medium manganese steel material with high yield ratio and continuous yield
A technology of high yield ratio, medium manganese steel, applied in the field of preparation of medium manganese steel materials, can solve the problems of residual Lüders belt, low yield strength, and reduce the anti-intrusion performance of automobile components, achieve high yield ratio, improve the position Dislocation density, the effect of improving deformation behavior
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Embodiment 1
[0024] 1. Molten steel is smelted according to the set composition, and steel billet is made by refining and continuous casting; its composition contains C0.05%, Si 1.54%, Mn 8.9%, Al 1.0%, P 0.005%, S 0.001%, N by weight percentage 0.004%, the rest is Fe and unavoidable impurities;
[0025] 2. Heat the billet to 1200°C, keep it warm for 90 minutes, then carry out rough rolling and finish rolling, and cool to 600°C to coil to obtain a hot-rolled steel strip; the rough rolling start temperature is 1170°C, the final rolling temperature is 1050°C, and the rough rolling temperature is 1050°C. Rolling cumulative rolling reduction rate is 50%; finishing rolling start temperature is 1020°C, finishing rolling temperature is 960°C, finishing rolling cumulative rolling reduction rate is 70%;
[0026] 3. Pickling the hot-rolled steel strip to remove surface oxide scale, and then cold-rolling, the total cold-rolling reduction rate is 50%, to obtain a cold-rolled steel strip;
[0027] 4. ...
Embodiment 2
[0035] 1. Molten steel is smelted according to the set composition, and steel billet is made by refining and continuous casting; its composition contains C0.15%, Si 2.0%, Mn7.0%, Al 2.05%, P 0.005%, S 0.001%, by weight percentage, N 0.004%, the rest is Fe and unavoidable impurities;
[0036] 2. Heat the steel billet to 1200°C, keep it warm for 90 minutes, then carry out rough rolling and finish rolling, and cool to 650°C to coil to obtain a hot-rolled steel strip; the rough rolling start temperature is 1160°C, the final rolling temperature is 1000°C, and the rough rolling temperature is 1000°C. Rolling cumulative rolling reduction rate is 60%; finishing rolling start temperature is 1030°C, finishing rolling temperature is 920°C, finishing rolling cumulative rolling reduction rate is 60%;
[0037] 3. Pickling the hot-rolled steel strip to remove surface oxide scale, then cold-rolling, the total reduction rate of cold-rolling is 40%, and obtaining the cold-rolled steel strip;
...
Embodiment 3
[0046] 1. Molten steel is smelted according to the set composition, and steel billet is made by refining and continuous casting; its composition contains C0.1%, Si 1.0%, Mn 8.1%, Al 1.80%, P 0.003%, S 0.002%, N by weight percentage 0.006%, the rest is Fe and unavoidable impurities;
[0047] 2. Heat the steel billet to 1200°C, keep it warm for 60 minutes, then carry out rough rolling and finish rolling, and cool to 550°C to coil to obtain hot-rolled steel strip; the rough rolling start temperature is 1120°C, the final rolling temperature is 1040°C, and the rough rolling temperature is 1040°C. Rolling cumulative rolling reduction rate is 70%; finishing rolling start temperature is 1010°C, finishing rolling temperature is 930°C, finishing rolling cumulative rolling reduction rate is 80%;
[0048] 3. Pickling the hot-rolled steel strip to remove surface oxide scale, and then cold-rolling, the total cold-rolling reduction rate is 50%, to obtain a cold-rolled steel strip;
[0049] ...
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