A kind of x70 anti-large deformation pipeline steel and its manufacturing method
A technology for large deformation resistance and pipeline steel, applied in the field of pipeline steel, it can solve the problems of large difference in performance of the same plate and high level of banded structure, and achieve the effect of low transformation point, precise control of the proportion of steel plate structure, and small size.
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[0045]A kind of X70 anti-large deformation pipeline steel of the present invention, the mass percent of chemical composition in this steel is C 0.04%-0.09%, Si 0.15%-0.55%, Mn 1.45%-1.75%, Nb 0.04%-0.10%, V 0.02%-0.08%, Ti0.01%-0.03%, Cu 0%-0.20%, Ni 0.15-0.55%, Mo 0-0.15%, Cr 0.15%-0.45%, Al0.025%-0.045%, N 0.0002%-0.011%, P≤0.015%, S≤0.005%, the rest is Fe and other unavoidable impurity elements.
[0046] In the present invention, the TMCP hot-rolled steel plate used for the X70 large-deformation-resistant pipeline steel is produced using the following process route: material preparation→converter or electric furnace smelting→external refining→casting→slab reheating→controlled rolling→controlled cooling.
[0047] The TMCP process temperature and cooling rate are controlled according to the following parameters: slab heating temperature 1050-1250°C; recrystallization zone controls rolling start temperature 950-1150°C, recrystallization zone controls rolling end temperature 90...
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