Ultralow-yield-ratio cold-rolled dual-phase steel and manufacturing method thereof
A dual-phase steel, ultra-low-yield technology, applied in the field of steel materials, can solve the problems of affecting the formability, the high price of Mo element, and the impact on the final performance, to improve the formability and resilience performance, and good comprehensive mechanical properties. , to avoid the effect of wrinkling the surface of the parts
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Embodiment 1
[0031] The trial-manufactured DP780 cold-rolled dual-phase steel has introduced a small amount of retained austenite into the microstructure with ferrite matrix and martensite islands as the basic characteristics, thus ensuring that the strength level reaches the level of similar steel companies. , elongation A 50 Stable increase to more than 20% (A 80 ≥18%), ultra-low yield ratio 0.44~0.45. Its manufacturing process is as follows:
[0032] 1) Smelting and continuous casting into slabs, components and weight percentages of slabs: C: 0.16%, Mn: 1.81%, Si: 0.47%, Al: 0.058%, P: 0.0069%, S: 0.0038%, Nb0 .04%, the balance is Fe and unavoidable impurities;
[0033] 2) Hot rolling is performed on the slab after conventional heating, the cumulative rolling reduction is 86%, the thickness of the hot-rolled finished product is 5.0mm, and the final rolling temperature is controlled at 850-880°C;
[0034] 3) Carry out coiling, control coiling temperature at 670 ℃;
[0035] 4) Carry ou...
Embodiment 2
[0044] 1) Smelting and continuous casting into slabs, components and weight percentages of slabs: C: 0.13%, Mn: 1.7%, Si: 0.43%, Al: 0.04%, P: 0.0068%, S: 0.0079%, N : 0.0043%, Nb0.028%, the balance is Fe and unavoidable impurities;
[0045] 2) Hot rolling is performed on the slab after conventional heating, the cumulative rolling reduction is 90%, the thickness of the hot-rolled finished product is 4.5mm, and the final rolling temperature is controlled at 850-880°C;
[0046] 3) Carry out coiling, control coiling temperature at 670 ℃;
[0047] 4) Carry out conventional pickling;
[0048] 5) Carry out cold rolling, control the cumulative reduction rate of cold rolling to 66.7%, and roll into a steel plate with a thickness of 1.5mm;
[0049] 6) Carry out continuous annealing, control the annealing temperature at 800-840°C, and annealing time 90-120 seconds;
[0050] 7) Cooling to 700-740°C at a slow cooling rate of 3-5°C / s;
[0051] 8) Perform rapid cooling, the cooling spee...
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