600mpa grade high yield strength ratio high plasticity cold-rolled steel plate and its manufacturing method
A high yield ratio, cold-rolled steel plate technology, applied in the field of cold-rolled high-strength thin plates for automobiles, can solve the problems of no comparability, no practical operability, and difficulty in annealing lines
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[0033] The present invention is further illustrated by some examples below. The composition of the steel in the example is shown in Table 1, the hot rolling process parameters are shown in Table 2, the continuous annealing process parameters are shown in Table 3, and the mechanical properties of the continuous annealed steel plate are shown in Table 4. The hot-rolled sheet microstructure of embodiment 1 sees figure 1 , the microstructure of cold-rolled annealed sheet see figure 2 , see the precipitates in the hot-rolled fire plate image 3 , cold-rolled annealed sheet transmission electron microscope photos see Figure 4 .
[0034] Chemical composition (mass fraction) % of table 1 embodiment steel
[0035] Example C Si mn P S Al N Nb Ti Nb+Ti 1 0.06 0.02 1.90 0.010 0.007 0.10 0.0050 0.020 0.025 0.045 2 0.08 0.09 1.72 0.009 0.010 0.02 0.0030 0.025 0.035 0.060 3 0.09 0.05 1.80 0.007 0.006 0.05 0.0020 0.030 0....
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