Secondary cooling nozzle of billet continuous casting machine and arrangement method thereof

Abstract

The invention discloses a secondary cooling nozzle of a billet continuous casting machine. The secondary cooling nozzle comprises a foot roll and connecting valves, wherein the foot roll comprises a first foot roll section, a second foot roll section and a third foot roll section; the first foot roll section and the second foot roll section, and the second foot roll section and the third foot rollsection are separated and connected through the connecting valves; the first foot roll section, the second foot roll section and the third foot roll section are formed through parallelly arranging left end foot rolls, middle end foot rolls and right end foot rolls; 12 nozzles are oppositely arranged on the left end foot rolls and the right end foot rolls of the first foot roll section; 9 nozzlesare oppositely arranged on the left end foot rolls and the right end foot rolls of the second foot roll section; and 4 nozzles are oppositely arranged on the left end foot rolls and the right end footrolls of the third foot roll section. According to the secondary cooling nozzle, cooling uniformity of casting billets of the small billet continuous casting machine is improved, phenomena of surfacetemperature returning of the casting billets and corner blackening of the casting billets are decreased, low-power corner cracks and inner cracks of the continuous casting billets are effectively reduced, productivity is increased, steps are simple, and operation is convenient.

Description

technical field [0001] The invention relates to the technical field of continuous casting in the field of metallurgy, in particular to a secondary cooling nozzle of a billet continuous casting machine and an arrangement method thereof. Background technique [0002] The continuous casting machine spray system is an important part of the whole system of the continuous casting machine, which determines the performance of the casting machine and the quality level of the slab to a large extent. Spray cooling, so that the slab is completely solidified, and the temperature of the slab is controlled to drop evenly along the direction of the slab. The billet continuous casting machine with 12m arc is prone to uneven cooling of the slab and temperature return on the surface of the slab, accompanied by low-fold corner cracks, internal cracks and severe central carbon segregation of the continuous casting slab, and the product cannot meet the user's requirements. During the secondary c...

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Problems solved by technology

The amount of secondary cooling water, improper distribution of each section and steam-water ratio, nozzle position, spray angle, coverage area, nozzle atomization, improper nozzle installation position, water and air pipe leakage, etc. will lead to uneven shell temperature, affect the secondary cooling effect, and then affect The temperature uniformity of the slab leads to internal cracks. In order to improve work efficiency, reduce the temperature return of the slab surface and the blackening of the corners of the slab, and the occurrence of low-magnification corner cracks and internal cracks in the continuous casting slab, the present invention proposes a Billet continuous casting machine secondary cooling nozzle and its arrangement method

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