Ultra-fast cooling method for improving buckling performance of hot-rolled steel plate
A hot-rolled steel plate and ultra-fast cooling technology, applied in metal rolling, metal rolling, workpiece cooling devices, etc., can solve problems such as warping, uneven water cooling at the head and tail, and affect product quality, so as to reduce the amount of warping , to ensure stable execution and reduce impact
Pending Publication Date: 2021-12-03
MINMETALS YINGKOU MEDIUM PLATE
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Problems solved by technology
[0003] However, in the existing process, the steel plate after being water-cooled by the ultra-fast cooling device usually has uneven water cooling at the head and tail, such as black heads buckle down and red heads up.
Continuous production under this water-cooling condition, due to the limitation of head and tail shielding flaws, the head and tail of the steel plate are seriously bent, and even the serious curvature can reach 27%+, which seriously affects the product quality, and is forced to add additional cold straightening or rescue The process cannot meet the production needs very well
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment
[0014] 1) First set the head and tail masking parameters.
[0015] Such as a steel plate with a certain specification, its parameters are as follows:
[0016] Head distance * head flow upper coefficient / lower coefficient = 400*0.3 / 0.3;
[0017] Tail distance * tail flow upper coefficient / lower coefficient = 800*0.4 / 0.4;
[0018] Head masking time 2. Among them, the valve response time is 1, and the flow rate ramp time is 6.
[0019] In this scheme, the valve response time is a parameter of the valve itself, which can be determined according to different valves. The flow rate ramp time refers to the time from the set flow coefficient to the maximum value (usually 1) after the valve is opened. For example, in this embodiment, taking the head as an example, it means The time from 30% to 100%, the flow curve of the cooling process is approximately in the shape of a "several", this time is the time taken from the initial low flow rate to the highest flow rate, and it climbs up ...
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The invention discloses an ultra-fast cooling method for improving buckling performance of a hot-rolled steel plate. The ultra-fast cooling method is characterized by comprising the following steps of setting head shielding time t after setting head and tail shielding distance and coefficient; the head shielding time t is the time from flow increase to ultra-fast cooling of the head of the steel plate, t is larger than 0 and smaller than t1+t2, wherein t1 is the valve response time, and t2 is the time when the flow reaches a target value; and the head shielding time t is equal to t0+delta t, wherein t0 is an initial set value, delta t is an adjustment value, and the relation between delta t and the length L of the black head or the length L<red>of the red head after the steel plate is discharged is as follows: delta t=-0.1*(L / 100) or delta t=0.1*(L<red> / 100). According to the scheme, time adjusting parameters are additionally arranged, so that the problem that in the ultra-fast cooling process, due to valve correspondence and the flow climbing process, the cooling quality of the steel plate is influenced is effectively solved, the temperature uniformity of the head, the tail and the body of the steel plate is improved, the buckling amount of the head and the tail of the steel plate is reduced, and the product quality is improved.
Description
technical field [0001] The invention belongs to the technical field of metallurgical manufacture, and in particular relates to an ultra-fast cooling method for improving the bending performance of a hot-rolled steel plate. Background technique [0002] In recent years, with the development of thin-gauge low-temperature water-cooled steel plates, higher requirements have been put forward for cooling technology in terms of cooling speed and cooling uniformity. The technology can meet the needs of various cooling processes, and has become the development trend of cooling technology after rolling of medium and heavy plates at home and abroad. [0003] However, in the existing process, uneven water cooling at the head and tail usually occurs in the steel plate after being water-cooled by the ultra-fast cooling device. Continuous production under this water-cooling condition, due to the limitation of head and tail shielding flaws, the head and tail of the steel plate are seriousl...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B21B45/02
CPCB21B45/0203
Inventor 李文刚牟凯李敬民张军冬
Owner MINMETALS YINGKOU MEDIUM PLATE