Hot rolling equipment

Abstract

In order to provide a hot rolling facility with which an improvement in the manufacturability and the quality of a thin plate material can be achieved with little facility investment, this hot rolling facility is equipped with a first rolling line (A), which directly performs finishing rolling with multiple rolling mills (12) on a thin slab (Wa) cast with a continuous-casting machine (10), and a second rolling line (B), which is arranged parallel to the first rolling line (A) and, with a roughing mill (21), reversibly rolls a thick slab (Wb) heated in a batch-type heating furnace (20) , with an intermediate material (Wc) that has been rolled with the second rolling line (B) being transported to the first rolling line (A) and undergoing finishing rolling at the first rolling line (A) to produce a final product (S). A crop shear device (30) that cuts and evens up the front and rear ends of the intermediate material (Wc) rolled with the roughing mill (21) is installed in the second rolling line (B).

Description

technical field [0001] The present invention relates to a hot rolling facility capable of improving the productivity and quality of thin plates with a small investment in facilities. Background technique [0002] Conventionally, for example, Patent Document 1 discloses a hot-rolling facility including a first rolling line and a second rolling line, and the first rolling line directs a thin slab cast by a continuous casting machine to a thin slab cast by a plurality of rolling mills. Finish rolling, the second rolling production line is arranged in parallel with the first rolling production line, and the thick slab heated by the batch heating furnace is used to roll the rough rolling mill, and the hot rolling equipment will be controlled by the first The intermediate billet rolled by the second rolling line is transferred to the first rolling line, and is finished rolled to a final product by the first rolling line. [0003] As a result, by transferring slabs of various slab...

AI Technical Summary

Problems solved by technology

[0009] However, in the hot rolling facility disclosed in Patent Document 1, when a thick slab is reversibly rolled by a roughing mill in the second rolling line, the temperature of the front and rear ends of the intermediate billet decreases, and there are also problems as follows Points: Defective shapes such as fishtails or flat tails are generated at the front and rear ends of the intermediate billet, lack of stability in final rolling or coiling in the first rolling line, and impair quality

[0010] In addition, in the rolling of the thick slab in the second rolling line, since the material heated by the batch heating furnace is rolled, the time from tapping to rough rolling varies depending on the position in the longitudinal direction of the material, and There is also a problem that the temperature in the longitudinal direction of the intermediate billet transferred to the first rolling line is different, so that the stability of rolling in the first rolling line and the quality of the final product are impaired.

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