Alloying furnace cooling section strip steel cooling apparatus and cooling control method

Abstract

The invention relates to an alloying furnace cooling section air blasting and air-spray cooling composite cooling device and a cooling regulation method; the cooling device controls different areas along the width direction of the strip steel, and the cooling speed is adjustable along the width of the strip steel; the device is divided into a lower section, a middle section and an upper section along the rolling direction of the strip steel; the middle section is in an alternative deployment way of air blasting cooling and air-spray cooling; the lower and the upper sections are in a pure cooling deployment way; and all sections are grouped in the rolling direction of the strip steel; each group of cooling way can be singly controlled by a switch. The device can regulate the cooling speed after the alloying of the strip steel within quite a large range according to the requirement of an alloying annealing curve even at maximum unit speed, so as to manufacture an alloyed hot-dip galvanized steel sheet with excellent cladding powder resistance, and the evenness of the cladding alloying is very good.

Description

technical field [0001] The patent relates to a strip steel cooling device and a cooling control method applied to an alloying furnace, in particular to a cooling device and a cooling adjustment method for cooling strip steel in a cooling section of an alloying furnace. Background technique [0002] Alloyed galvanized products are zinc-iron alloy coating products obtained by performing on-line coating annealing on strip steel after hot-dip galvanizing. The annealing treatment of the coating is completed in the alloying furnace. Usually the alloying furnace is divided into three sections: heating section, soaking section and cooling section. In the cooling section of the alloying furnace, fan jet cooling is usually used. [0003] However, the fan jet cooling has the following problems: (1) the cooling capacity is relatively low, resulting in slow cooling of the strip, and the zinc-iron alloy phase in the coating, especially the Γ phase and Γ 1 The phase grows more fully, an...

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Problems solved by technology

[0003] However, the fan jet cooling has the following problems: (1) the cooling capacity is relatively low, resulting in slow cooling of the strip, and the zinc-iron alloy phase in the coating, especially the Γ phase and Γ 1 The phase grows more fully, and the anti-powdering performance of the coating is poor; (2) In order to increase the cooling rate, a larger wind speed or air volume is often used, and these winds blowing directly on the strip will cause greater vibration of the strip, which is harmful to The uniformity of coating alloying and the uniformity of coating thickness controlled by air knife are very unfavorable

Since the strip steel is cooled by air jet cooling, the cooling speed is generally slow. When a large air volume is used to cool the strip steel, although the cooling speed can be increased, the strip steel will vibrate violently, which will not only cause uneven coating thickness, but also cause unit It is difficult to produce at high speed, which limits the capacity of the unit

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