Method for improving overall performance of multi-phase steel with hot-rolled deformation substructure
A technology of comprehensive performance and substructure, applied in the field of improving the comprehensive performance of multi-phase steel, can solve the problems of increasing the sensitivity index of cold cracks of steel plates, increasing the difficulty of welding, and increasing the manufacturing cost of steel plates, so as to increase the stability and hardenability, excellent Cold workability, effect of reducing Pcm value
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Embodiment 1
[0020] A method for improving the comprehensive performance of multi-phase steel by using the deformed substructure after hot rolling. The low-carbon steel with a thickness of 30.0mm is firstly rough-rolled in Ac 3 Finish rolling in the range of ~910°C, and the cumulative reduction rate of finish rolling is 60~80%; then cool at a rate of 95~135°C / s to 540~640°C, and then air cool for 6~11s, so that part of the steel will form ferrite , and finally laminar cooling to room temperature to obtain ferrite + martensite + retained austenite multiphase steel.
[0021] The chemical composition of the low carbon steel is: C is 0.01~0.09wt%, Mn is 0.5~1.0wt%, Si is 0.10~0.25wt%, Nb is 0.020~0.030wt%, Al is 0.04~0.06wt%, Cr is 0.20~0.75wt%, P is 0.020~0.048wt% and S≤0.005wt%, and the rest is iron and unavoidable impurities.
[0022] The mechanical properties of the multiphase steel obtained in this embodiment are: yield strength Rp 0.2 422~439MPa; tensile strength R m 820~838MPa; Elon...
Embodiment 2
[0024] A method for improving the comprehensive performance of multi-phase steel by using the deformed substructure after hot rolling. The low-carbon steel with a thickness of 30.0mm is firstly rough-rolled in Ac 3 Finish rolling in the range of ~910℃, and the rolling reduction rate of the finishing rolling is 80~100%; then cooling to 580~680℃ at a rate of 110~150℃ / s, air cooling for 5~10s, so that part of the steel will form ferrite, Finally laminar cooling to room temperature.
[0025] The chemical composition of the low carbon steel is: C is 0.02~0.10wt%, Mn is 1.1~1.6wt%, Si is 0.20~0.35wt%, Nb is 0.015~0.025wt%, Al is 0.03~0.05wt%, Cr is 0.10~0.65wt%, P is 0.010~0.038wt%, and S≤0.005wt%, and the rest is iron and unavoidable impurities.
[0026] The mechanical property of the multi-phase steel that present embodiment obtains is: Yield strength Rp 0.2 438~455MPa; tensile strength R m 835~850MPa; Elongation A 50It is 21~24%; the yield strength ratio is 0.515~0.545; the ...
Embodiment 3
[0028] A method for improving the comprehensive performance of multi-phase steel by using the deformed substructure after hot rolling. The low-carbon steel with a thickness of 30.0mm is firstly rough-rolled in Ac 3 Finish rolling in the range of ~910°C, and the cumulative reduction rate of the finish rolling is 70~90%; then cool at a rate of 80~120°C / s to 610~710°C, and then hold the temperature for 7~12s, so that part of the steel will form ferrite , and finally cooled to room temperature by laminar flow.
[0029] The chemical composition of the low carbon steel is: C≤0.08wt%, Mn 0.8~1.3wt%, Si≤0.15wt%, Nb≤0.020wt%, Al 0.02~0.04wt%, Cr≤0.55wt%, P≤0.028wt% and S≤0.005wt%, the rest is iron and unavoidable impurities.
[0030] The mechanical properties of the multiphase steel obtained in this embodiment are: yield strength Rp 0.2 415~428MPa; tensile strength R m 795~825MPa; Elongation A 50 is 23~26%; yield ratio is 0.5~0.542; processing hardness index n is 0.13~0.15.
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