A kind of manufacturing method of thin gauge hot-rolled strip steel

Abstract

The invention discloses a manufacturing method for thin-specification hot-rolled strip steel. The manufacturing method is characterized in that a single-machine uniflow thin slab continuous casting machine is directly connected with a rolling mill. The manufacturing method comprises the steps of steel-making, continuous casting, swing type shearing, steel pushing, descaling, side heating, unit rough rolling, fly shearing, coreless coiling, induction heating, descaling, unit finish rolling, strip steel cooling, shearing, coiling, coil discharging, bundling, coil transporting, weighing and marking, transporting and storing. The manufacturing method adopts an endless rolling process or a single-billet rolling process. A temperature of casting billet at an outlet of the continuous casting machine is higher than that of an ESP production line by 100-150 DEG C, so that a utilization rate of waste heat of continuously cast billet is increased, and energy consumption is reduced; compared with the ESP production line, the manufacturing method has the advantages that: swing type shears and a steel pushing roller way are migrated to the front of a roughing mill, so that distances from the swing type shears and the steel pushing roller way to a middle roller way are shortened after rough milling, temperature drop of intermediate billets is reduced, induction heat compensation amount is reduced, and a roll of the roughing mill can be prevented from generating thermal cracks. A descaling device is arranged at an inlet of the roughing mill, and a finish rolling unit adopts an online heating preparation technology and an online quick roll-changing technology, so that surface quality of products is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled strip steel rolling, in particular to a method for manufacturing thin-gauge hot-rolled strip steel. Background technique [0002] The emergence of the ESP thin slab endless rolling production line has made the large-scale and stable production of thin-gauge hot-rolled strip steel a reality. On the Arvedi ESP production line, through the continuous production process, molten steel passes directly through a continuous casting machine and rolling line to produce hot-rolled steel coils. The production line first casts thin slabs, and then directly enters the three-stand large-reduction roughing mill arranged at the exit of the continuous casting machine for rolling, rolling into an intermediate billet with a thickness of 10-20mm, and then the intermediate billet is placed in the induction heater Heating is performed and then rolled to the target thickness by a five-stand finishing mill, after whic...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a thin-gauge hot-rolled steel strip manufacturing method to solve the problems of high power consumption and poor surface quality of the current ESP production line

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