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

A technology of an alloying furnace and a cooling device, which is applied to the cooling device and cooling adjustment field of cooling strip steel in the cooling section of the alloying furnace, can solve the problems of low cooling capacity, unfavorable uniformity of coating thickness, strip steel vibration, etc., and achieves forming The effect of excellent performance and excellent anti-powder performance of the coating

Active Publication Date: 2009-03-04
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 harmfu

Method used

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

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Embodiment 1

[0031] Example 1: When the unit produces 1.2×1000mm 590MPa-level alloyed hot-dip galvanized dual-phase steel, the higher the cooling rate in the cooling section of the alloying furnace, the more favorable it is for the formation of the dual-phase structure of the dual-phase steel. Moreover, when the unit speed When the temperature is 80 m / min, the alloying temperature is around 480°C, and the strip temperature does not change much along the width direction. The capacity setting values ​​of each unit of the cooling device are shown in Table 2. The anti-powdering properties of the obtained coatings are shown in Table 3. * Note: 60 o V-bend grades are divided into nine grades. In terms of powdering resistance, grade 1 is the best, grade 9 is the worst, and grades 1 to 5 are qualified.

[0032] Table 2 Capacity settings of each unit in the cooling section of the alloying furnace when producing 1.2×1000mm dual-phase steel

[0033] area

Zone 1 Ability Settings

(0~...

Embodiment 2

[0040] Example 2: When the unit produces 0.8×1400mm alloyed hot-dip galvanized bake-hardened steel, the strip steel is relatively wide. When the unit speed is 90 m / min, the alloying temperature is about 510°C, and the strip steel temperature is along the width direction The change is large, the temperature of the middle strip steel is obviously higher than the temperature of the strip steel on both sides, and the alloyed hot-dip galvanized bake-hardened steel coating is easy to pulverize, and increasing the cooling capacity is beneficial to improving the pulverization resistance of the coating. Therefore, the cooling device The capacity setting values ​​of each unit are shown in Table 4. The anti-powdering properties of the obtained coatings are shown in Table 5.

[0041] Table 6 Capacity settings of each unit in the cooling section of the alloying furnace when producing 0.7×1500mm IF steel

[0042] area

Zone 1 Ability Settings

(0~100%) Zone 2 Ability Settin...

Embodiment 3

[0049] Embodiment 3: When the unit produced 0.7 × 1500mm alloyed hot-dip galvanized IF steel, although the width of the strip steel was wide, the alloying temperature of the IF steel was relatively low. When the speed of the unit was 80 m / min, the alloying temperature was at 450°C, therefore, the setting values ​​of the capacity of each unit of the cooling device are shown in Table 6. The anti-powdering properties of the obtained coatings are shown in Table 7.

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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...

Claims

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Application Information

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IPC IPC(8): C23C2/26C23C2/06C22F1/16C21D9/56
Inventor 李俊张理扬林秀贞
Owner BAOSHAN IRON & STEEL CO LTD
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