Gas jet cooling device for continuous annealing furnace
A continuous annealing furnace, gas jet technology, applied in the direction of furnace cooling, furnace, furnace components, etc., can solve the problems of unrecommended operation cost, large power consumption, large pressure loss, etc., achieve uniform and beautiful material, promote gas circulation, The effect of high-efficiency cooling
Active Publication Date: 2012-07-18
JFE STEEL CORP
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Problems solved by technology
In addition, since the box-shaped head receives radiant heat from the steel strip and tends to increase its temperature, there is a problem that the overall cooling capacity decreases.
In addition, since the length of the protruding nozzle is 150-200mm, the pressure loss is large, and a powerful supercharger is required, which consumes a lot of power, and it is not recommended in terms of operating costs.
[0011] The method of Patent Document 2 introduces hydrogen gas with a uniform concentration (20-80%) into the head, but the temperature distribution in the width direction of the steel strip will be uneven due to the influence of gas flow, furnace wall, and head structure. Cooling uniformly in the width direction of the tape may cause material unevenness due to temperature distribution in the width direction
In addition, since the vibration of the steel strip will occur, the speed of the injected gas is limited (100~190m / s)
Method used
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[0056] In the cooling zone after the soaking zone of the continuous molten zinc and gold plating line, a gas jet cooling device of the following specification was installed, and a production experiment of a high-tensile steel strip was carried out.
[0057] [Example of the present invention, comparative example]
[0058] as Figure 1 ~ Figure 3 The gas jet cooling device shown.
[0059] Pressure head: Equivalent to 50A circular section, length 1750mm
[0060] Nozzle diameter: front ф20mm, base ф28.8mm
[0061] Nozzle protrusion height: 50mm
[0062] Nozzle cone angle: 10.058°
[0063] Distance from nozzle to steel belt: 100mm
[0064] Nozzle arrangement of the pressure head: 12 with a pitch (W) of 140mm
[0065] The configuration of the pressure head in the direction of the long side of the steel strip: 65 columns are set at a distance (L) of 125mm on both the front and back sides
[0066]The number of divisions in the width direction of the pressure head: 5 parts. Fou...
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A gas jet cooling device for a continuous annealing furnace is configured so as to reduce a non-uniform temperature distribution in a steel band in the lateral direction thereof and to reduce the fluttering of the steel band when the gas ejection speed is increased. A gas jet cooling device for a continuous annealing furnace is configured in such a manner that tube-like pressure headers which have a length greater than the width of the steel band are arranged on each of the front and rear surface sides of the steel band at an interval (L) in the longitudinal direction of the steel band so as to face the surface of steel band, and that nozzles which are provided to the pressure headers so as to protrude therefrom are arranged at an interval (W) in the lateral direction of the steel band, the nozzles being arranged in a staggered pattern in the longitudinal direction of the steel band. The pressure headers on the front surface side of the steel band and the pressure headers on the rear surface side thereof are displaced in position from each other in the longitudinal direction of the steel band so that the displacement interval in the longitudinal direction of the steel band is not less than 1 / 3 but not more than 2 / 3 the interval (L) of the pressure headers in the longitudinal direction of the steel band. Also, the nozzles on the front surface side of the steel band and the nozzles on the rear surface side thereof are displaced from each other in the lateral direction of the steel band so that the amount of the displacement, relative to each of the nozzles on one of the front and rear surface sides of the steel band, of each of the nozzles on the other surface side of the steel band is not less than 1 / 6 but not more than 1 / 3 the interval (W) of the nozzles in the lateral direction of the steel band.
Description
technical field [0001] The invention relates to a gas jet cooling device for a continuous annealing furnace. Background technique [0002] In the continuous annealing furnace, the steel strip is continuously heated, soaked and cooled, and over-aging is performed as necessary. In order to make the properties of the steel strip desired, it is important to uniformly and rapidly cool the steel strip in addition to the heating temperature and soaking time. In recent years, the development of high-strength steel such as automotive materials has progressed, and rapid cooling from an annealing temperature of 900-800°C to about 300-150°C has been performed in order to achieve desired tensile strength, bending properties, and elongation properties. process development. [0003] In the cooling of the steel strip, various cooling media are used, and the cooling speed of the steel strip is also different according to the choice of the refrigerant. [0004] If water is used as the cool...
Claims
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Login to View More IPC IPC(8): C21D9/573
CPCC21D9/573F27D9/00F27B9/28C21D9/5735
Inventor小林弘和武田玄太郎高桥秀行佐佐木成人
OwnerJFE STEEL CORP