An ultra-rapid cooling device for medium and heavy plates after rolling
An ultra-fast cooling and cooling device technology, which is applied in the cooling field of steel rolling, can solve the problems that affect the heat transfer efficiency, and the jet cooling water cannot break through the accumulated water layer, etc., so as to increase the heat transfer efficiency, avoid adverse effects, and ensure symmetrical distribution. Effect
Active Publication Date: 2017-01-18
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
However, if the "soft water seal" is improperly designed, a large amount of residual water will accumulate before the "soft water seal", which will prevent the jet cooling water from breaking through the accumulated water layer and affect the heat transfer efficiency
Method used
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Embodiment 1
[0021] Take the low-cost Q345B production of a domestic steel mill as an example.
[0022] Process parameters and cooling procedures
[0023] The billet thickness is 220mm, the start rolling temperature is 860~870°C, 6 passes are rolled, the steel plate thickness after rolling is 18mm, the final rolling temperature is 820~830°C, and the target final cooling temperature is 550°C according to the process requirements. The control model sets the height of the upper header frame as H=H 0 +Δh=300+18=318mm, and set the corresponding cooling rules as shown in Table 1.
[0024] Table 1 Flow and opening status of each header
[0025]
[0026] Temperature result
[0027] Use the final cooling temperature actually collected by the thermometer to draw the upper and lower surface temperature curves of the steel plate after cooling, such as Figure 5 Shown.
[0028] by Figure 5 It can be seen that the actual final cooling temperature of more than 90% of the longitudinal direction of the steel plate ...
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The invention discloses an after-moderate-thickness-plate-rolling ultra-fast cooling device. Included angles between the forward / backward upper collecting pipe jet flow directions of the ultra-fast cooling device and the surface of a moderate-thickness plate are both theta; Included angles between forward / backward jet flow lower collecting pipes and the surface of the moderate-thickness plate are both phi; a spraying area formed by a forward upper collecting pipe and a backward jet flow upper collecting pipe which are adjacent on the upper surface of a steel plate is symmetrical with a spraying area formed by the forward jet flow lower collecting pipe and the backward jet flow lower collecting pipe which are adjacent on the lower surface of the steel plate, and the condition of a formula (please see the specifications for the formula) is met, wherein L is the distance between the forward upper collecting pipe and the backward upper collecting pipe, l is the distance between the forward lower collecting pipe and the backward lower collecting pipe, H is the vertical distances between water outlets of the upper collecting pipes and the upper surface of the moderate-thickness plate, and h is the vertical distances between water outlets of the lower collecting pipes and the lower surface of the moderate-thickness plate. According to the after-moderate-thickness-plate-rolling ultra-fast cooling device, coupling symmetrical distribution is achieved by reasonably designing every two adjacent slant spraying collecting pipes of the ultra-fast cooling device, and the adverse effect of the irreducible water is effectively avoided.
Description
Technical field [0001] The invention relates to the technical field of cooling of rolled steel, in particular to a new type of super-fast cooling header device for medium and thick plate after rolling with an inclined symmetrical design. Background technique [0002] In recent years, the development of controlled cooling technology after rolling of medium and heavy plates and the huge benefits it brings have received widespread attention. With the research and development of high-quality products, the requirements for the cooling process are more stringent. Lower final cooling temperature and higher cooling rate help to improve the comprehensive mechanical properties of the steel plate, but the plate shape problem caused by uneven cooling is becoming more and more prominent. [0003] In the ultra-rapid cooling system, the jet header is arranged along the rolling direction of the steel plate, and the upper and lower surfaces of the steel plate are cooled incompletely symmetrically....
Claims
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IPC IPC(8): B21B45/02
CPCY02P70/10
Inventor 王丙兴张田王昭东王国栋田勇韩毅李勇
Owner NORTHEASTERN UNIV LIAONING