Steel sheet heating method in continuous annealing and continuous annealing facility
A technology of heating method and annealing equipment, applied in lighting and heating equipment, heat treatment equipment, heat treatment furnace, etc., can solve problems such as uneven temperature, and achieve the effect of improving product quality
Pending Publication Date: 2020-09-04
JFE STEEL CORP
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Problems solved by technology
[0008] However, the technology disclosed in the above-mentioned Patent Document 2 controls the flow rate of the fuel supplied to the annealing furnace based on the plate temperature measured at the exit side of the preheating furnace to control the plate temperature in the annealing furnace, but it does not also control the temperature at the exit side of the preheating furnace. plate temperature technology
Therefore, there is a problem that it is difficult to control the temperature of the steel plate within a predetermined range in the annealing furnace when the steel plate on the exit side of the preheating furnace has a large temperature unevenness and is overheated.
Method used
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Embodiment
[0048] exist Figure 4 In the continuous annealing equipment shown there is a direct flame heating furnace, a soaking furnace and a cooling furnace, and a direct flame semi-soaking furnace with the function of the present invention is arranged between the above heating furnace and the soaking furnace , the heat treatment which made the soaking temperature into 1000 degreeC was given to the hot-rolled steel plate of plate thickness 2.0mm x plate width 1100mm. In addition, the above-mentioned semi-soaking furnace is a structure in which the second half of the conventional heating furnace is isolated from the front half, and the function of the semi-soaking furnace of the present invention is given. furnace for use.
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A steel sheet is heated in a continuous annealing facility provided with a straight-flame-type heating furnace, a soaking furnace, and a cooling furnace. A straight flame type semi-soaking pit furnaceis arranged between the heating furnace and the soaking pit furnace, and in the heating furnace, the steel sheet is heated, so that the temperature of the steel sheet on the outlet side of the heating furnace becomes (target soaking temperature-[delta] T); and in the semi-soaking furnace, the furnace temperature is set as the target soaking temperature of the steel plate, and the steel sheet is heated so that the temperature of the steel sheet becomes a target soaking temperature at any position in the semi-soaking furnace, so that the temperatures in the longitudinal direction and the widthdirection of the steel sheet are uniformized, and the steel sheet is reliably prevented from being overheated at a soaking temperature that is a heating target. Herein, [Delta] T is a value that is equal to or greater than the fluctuation range of the steel plate temperature when the plate temperature is feedback-controlled by the heating furnace and equal to or less than 1 / 2 of the steel plate heating capacity of the semi-soaking furnace.
Description
technical field [0001] The present invention relates to the technology of continuous annealing of steel plates, and specifically relates to a heating method of steel plates suitable for continuous annealing of hot-rolled steel plates and cold-rolled steel plates, and continuous annealing equipment used in the method. Background technique [0002] As a method of heat-treating a hot-rolled steel sheet (hot-rolled steel sheet) or a cold-rolled steel sheet (cold-rolled steel sheet), there are batch annealing using a box-type annealing furnace, and rewinding a steel sheet coil while rewinding it. Continuous annealing is performed in an annealing furnace in which plates are fed and heat treatment is performed continuously, but in recent years, the latter continuous annealing, which is excellent in productivity, is often used. Compared with batch annealing, this continuous annealing has the advantage that the treatment temperature of the steel sheet can be made uniform, and the tre...
Claims
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IPC IPC(8): C21D9/56C21D11/00
CPCC21D11/00C21D9/56F27B9/028F27B9/40C21D9/0056F27D21/0014F27D2019/0003C21D11/005C21D9/70F27D19/00F27D21/00
Inventor 西田哲郎
Owner JFE STEEL CORP