METHOD OF PRODUCTION OF THIN-SHEET HOT-ROLLED STEEL Russian patent published in 2005 - IPC

FIELD: metallurgy; methods of production of thin-sheet hot-rolled steel.

SUBSTANCE: the invention is pertaining to the field of rolling, in particular, to methods of production of thin-sheet hot-rolled steel. The technical result of the invention is production of hot-rolled steel of no more than 3.9 mm thick with the properties similar to the properties of the cold- rolled sheet steel, and having a tarnish or a rough surface, that increases commercial profits of the rolled steel. The offered method provides for hot rolling of bands, their refrigerating to the temperature of a reeling - tc by the sectional water quenching, a reeling, etching treatment with HCI solution and a temper rolling. For the bands of steel with a carbon share of up to 0.1 mass % the temperature of the end of rolling is kept equal to 860... 890°C. The water quenching of the bands begin in 7...9 seconds after the end of rolling, and tc is taken within the temperatures range of 640... 700°С. At that the bands temper rolling for production of their tarnish surface realize in the rollers with a height of micro-asperities of the barrels Ra = 2.2... 2.7 microns and for production of the rough surface - with = 2.9... 4.0 microns.

EFFECT: higher efficiency.

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