A kind of high-toughness B-containing hot-rolled low-carbon bainite steel plate and its production method
A low-carbon bainite and production method technology, applied in the field of steel material engineering, can solve the problems of strength and impact toughness fluctuations, large fluctuations in strength and impact toughness, etc., so as to reduce the strength difference, reduce the rolling direction and the transverse strength difference , the effect of toughness index optimization
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Embodiment 1
[0021] See Table 1 for the chemical composition (wt%) of the high-toughness B-containing hot-rolled low-carbon bainite steel hot-rolled flat plate Q690 in this example.
[0022] Table 1 Chemical composition (wt%) of high toughness B-containing hot-rolled low-carbon bainite steel Q690 hot-rolled flat plate
[0023] element C Si mn P S Nb Ti Alt B Cr Mo content 0.07 0.20 1.75 0.009 0.003 0.051 0.012 0.035 0.0018 0.25 0.10
[0024] The specific parameters of the rolling process and the laminar flow segmental cooling process in the production process of the high-toughness B-containing hot-rolled low-carbon bainite steel hot-rolled flat plate Q690 in this embodiment are shown in Table 2.
[0025] The production process of the high-toughness B-containing hot-rolled low-carbon bainite steel plate in this embodiment: the reheating temperature is 1250° C., and the furnace time is 3 hours. Two-stage controlled rolling is adopted, rough rol...
Embodiment 2
[0032] Table 4 shows the chemical composition (wt%) of the high-toughness B-containing hot-rolled low-carbon bainite steel hot-rolled flat plate Q690 in this example.
[0033] Table 4 Chemical composition (wt%) of hot-rolled low-carbon bainite steel Q690 hot-rolled flat plate containing B with high toughness
[0034] element C Si mn P S Nb Ti Alt B Cr Mo content 0.07 0.23 1.73 0.011 0.003 0.049 0.014 0.037 0.0017 0.25 0.10
[0035] The production process of the high-toughness B-containing hot-rolled low-carbon bainite steel plate in this embodiment: the heating temperature is 1260° C., and the furnace time is 3 hours. Two-stage controlled rolling is adopted, rough rolling is rolling in the recrystallization zone for 4 passes, the starting rolling temperature is 1100°C, and the final rolling temperature is 1085°C; the intermediate billet thickness is 70mm, and finishing rolling is rolling in the non-recrystallization zone for 7 pas...
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