Technology to prevent continuous casting slab narrow side bulging
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A process method and continuous casting slab technology, which is applied in the field of slab width adjustment technology, can solve problems such as cracking, narrow-side copper plates detached from the slab shell, and steel breakout, so as to avoid steel breakout accidents, stabilize production and improve slab production. quality effect
Active Publication Date: 2020-12-18
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
However, in actual casting, especially in the process of thermal width adjustment, when the mold width sensor is abnormal or the mechanical hydraulic failure occurs, the narrow-side copper plate will break away from the billet shell, and the billet shell without support will burst after bulging, resulting in a steel breakout accident
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Embodiment 1
[0033] 1. For a certain steel type, it is planned to carry out thermal width adjustment during pouring, and the width of crystallizer 1 is reduced from 1500mm to 1400mm;
[0034] 2. When the pouring speed is 1.3m / min, start to adjust the width;
[0035] 3. Before the width adjustment starts, the detected temperatures of the three thermocouples 4 in a row of the narrow-side copper plate 3 on the east side of the crystallizer 1 are 250, 225, and 190°C respectively;
[0036] 4. At the beginning of width adjustment, the detection temperature of thermocouple 4 remains unchanged, and when the width adjustment is about to end, the detection temperatures of the above three thermocouples 4 drop to 223, 195, and 176°C respectively;
[0037] 5. At this time, the detection temperature of the thermocouple 4 on the wide copper plate 2 does not change, and the pulling speed does not change;
[0038] 6. The system sends out a bellows alarm and automatically reduces the speed to 0.2m / min;
...
Embodiment 2
[0042] 1. For a certain steel type, it is planned to carry out thermal width adjustment during pouring, and the width of crystallizer 1 is increased from 1200mm to 1350mm;
[0043] 2. When the pouring speed is 1.1m / min, start to adjust the width;
[0044] 3. Before the width adjustment starts, the detected temperatures of the three thermocouples 4 in a row of the narrow-side copper plate 3 on the west side of the crystallizer 1 are 223, 210, and 185°C respectively;
[0045] 4. At the beginning of width adjustment, the detection temperatures of the above three thermocouples 4 drop to 205, 188, and 160°C respectively;
[0046] 5. At this time, the detection temperature of the thermocouple 4 on the wide copper plate 2 does not change, and the pulling speed does not change;
[0047] 6. The system sends out a bellows alarm and automatically reduces the speed to 0.2m / min;
[0048] 7. The operator inspected and found that the actual reverse taper on the west side was a negative num...
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Abstract
The invention discloses a process method for preventing the narrow-edge bulging of a continuous casting billet. A plurality of rows of thermocouples are mounted on a wide-surface copper plate (2) anda narrow-edge copper plate. The method comprises the following steps: that step 1, molten steel enters a crystallizer (1) and the temperature is transmitted to thermocouples; step 2, the temperature of the copper plate is recorded by the thermocouples; step 3, whether the temperature of the thermocouples in the same column on the narrow-edge copper plate is reduced to be greater than or equal to 10 DEG C is judged, and if not, the step 2 is continuously returned; if yes, the step 4 is continuously executed; step 4, judging whether the number of the thermocouples meeting the condition in the step 3 is larger than or equal to 2, and if not, and the step 3 is continuously returned ; if yes, the step 5 is continuously executed; step 5, judging whether the temperature of the wide-surface copperplate is reduced to be greater than or equal to 10 DEG C, and the number ratio of the thermocouples is greater than or equal to 20%, if yes, the step 6 is continuously executed ; if not, the step 7 is executed; step 6, width adjusting is carried out, whether the start pulling speed is greater than the current pulling rate, if yes, the width adjusting is stopped, if not, the step 8 is executed; step 7, an alarm is generated by the bulging, the width adjusting is stopped, and the pulling speed is reduced; and step 8, generally, the alarm is generated, the width adjusting is stopped, and the pulling speed is reduced.
Description
technical field [0001] The invention relates to a process for adjusting the width of a slab during pouring of a crystallizer, in particular to a process for preventing the narrow side of a continuous casting slab from bulging. Background technique [0002] In continuous casting production, mold width adjustment during casting is an effective means to improve continuous casting efficiency and reduce production costs. There are two main technical methods for continuous casting crystallizer width adjustment, one is "Z" or "P" shape width adjustment (slow speed width adjustment), and the other is "S" shape width adjustment (high speed width adjustment) . Among them, although the "S" shape width adjustment was developed late, it has become a mainstream technology because of its fast width adjustment speed, short transition billet, and good contact between the narrow side copper plate and the billet shell during width adjustment. [0003] After the molten steel enters the crysta...
Claims
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Application Information
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