Steel for controlled rolling and controlled cooling platform and production method thereof
An offshore platform, controlled rolling and controlled cooling technology, applied in controlled rolling and controlled cooling offshore platform steel and its production, Z35 grade TMCP offshore platform steel, 40kg field, can solve long production cycle, high production cost, complicated process, etc. problems, to achieve the effect of good cold bending performance, short lead time and cost saving
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[0019] Example 1
[0020] The design composition of the steel for controlled rolling and controlled cooling offshore platform by weight percentage is: C 0.085%, Mn1.42%, Si 0.36%, Nb 0.034%, Ti 0.012%, V 0.066%, S 0.003%, Als 0.030%, P 0.010%, the rest is Fe and unavoidable impurities.
[0021] The TMCP process includes heating, rough rolling, finishing rolling, and cooling, specifically:
[0022] The molten steel smelted according to the above chemical composition design is cast into a 250mm thick slab; the billet is heated in a slab heating furnace at a heating temperature of 1200°C and a heating time of 4h; then it is discharged from the furnace for rolling. The opening temperature of rough rolling is controlled at 1060~1120℃; the thickness of intermediate billet to be heated is 90mm; the opening temperature of finishing rolling is controlled at 850~870℃; the final rolling temperature is controlled at 780~815℃. The starting cooling temperature is controlled at 770~800℃; the end...
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[0024] Example 2
[0025] The design composition of steel for controlled rolling and controlled cooling offshore platform by weight percentage is: C0.065%, Mn1.31%, Si 0.39%, Nb 0.037%, Ti 0.014%, V 0.05%, S 0.002%, Als 0.038% , P 0.008%, the rest is Fe and unavoidable impurities.
[0026] The TMCP process includes heating, rough rolling, finishing rolling, and cooling, specifically:
[0027] The molten steel smelted according to the above chemical composition design is cast into a 250mm thick slab; the billet is heated in a slab heating furnace at a heating temperature of 1180°C and a heating time of 4h; then it is discharged from the furnace for rolling. The rough rolling opening temperature is controlled at 1070~1120℃; the thickness of the intermediate billet to be heated is 100mm; the finishing rolling opening temperature is controlled at 845~860℃; the final rolling temperature is controlled at 780~805℃. The starting cooling temperature is controlled at 770~795℃; the ending co...
Example Embodiment
[0029] Example 3
[0030] The design composition of steel for controlled rolling and controlled cooling offshore platform by weight percentage is: C0.071%, Mn1.35%, Si 0.38%, Nb 0.041%, Ti 0.012%, V 0.051%, S 0.002%, Als 0.034% , P 0.007%, the rest is Fe and unavoidable impurities.
[0031] The TMCP process includes heating, rough rolling, finishing rolling, and cooling, specifically:
[0032] The molten steel smelted according to the above chemical composition design is cast into a 250mm thick slab; the billet is heated in a slab heating furnace at a heating temperature of 1200°C and a heating time of 4h; then it is discharged from the furnace for rolling. The rough rolling opening temperature is controlled at 1080~1120℃; the thickness of the intermediate billet to be heated is 150mm; the finish rolling opening temperature is controlled at 840~855℃; the final rolling temperature is controlled at 780~800℃. The starting cooling temperature is controlled at 770~790℃; the ending cool...
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