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Method to avoid steel breakout caused by continuous casting crystallizer heat-adjusted width billet shell being extruded

A technology for continuous casting mold and thermal width adjustment, which is applied in the field of avoiding steel breakout caused by extrusion of the thermally adjusted shell of the continuous casting mold, can solve the problems of easy cracking and no technical means and solutions have been published publicly. Achieve high applicability, optimized moving speed, and stable production.

Active Publication Date: 2021-04-13
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is related to the characteristics of high-strength steel and high-carbon high-alloy steel that are prone to cracking under high-speed extrusion at high temperatures. At present, no relevant technical solutions and solutions have been published.

Method used

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  • Method to avoid steel breakout caused by continuous casting crystallizer heat-adjusted width billet shell being extruded
  • Method to avoid steel breakout caused by continuous casting crystallizer heat-adjusted width billet shell being extruded
  • Method to avoid steel breakout caused by continuous casting crystallizer heat-adjusted width billet shell being extruded

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. For the 1# continuous casting machine of an enterprise, the wide copper plate of the crystallizer is equipped with 6 rows and 3 rows of thermocouples 4;

[0040] 2. For a high-carbon and high-alloy steel grade, it is planned to conduct thermal width adjustment during pouring, and the width of crystallizer 1 is reduced from 1500mm to 1400mm;

[0041] 3. When the pouring speed is 1.3m / min, start to adjust the width;

[0042] 4. At the beginning of widening, the temperature of a row of three thermocouples 4 on the inner arc width surface of crystallizer 1 is 250, 225, and 190°C respectively;

[0043] 5. The temperature of thermocouple 4 remains unchanged at the beginning of width adjustment, and the temperature of the above three thermocouples 4 drops to 215, 192, and 155°C respectively during the width adjustment process;

[0044] 6. The system sends out an abnormal alarm and automatically reduces the speed to 0.6m / min;

[0045] 7. The operator stops the width adjust...

Embodiment 2

[0048] 1. For the 1# continuous casting machine of an enterprise, the wide copper plate of the crystallizer is equipped with 6 rows and 3 rows of thermocouples 4;

[0049] 2. For a certain type of high-strength steel, the No. 1 machine is planned to carry out thermal width adjustment during pouring, and the width of crystallizer 1 is reduced from 1600mm to 1450mm;

[0050] 3. When the pouring speed is 1.1m / min, start to adjust the width;

[0051] 4. Before the width adjustment starts, the temperatures of a row of three thermocouples 4 on the west side of the inner arc width of the crystallizer 1 are 223, 199, and 170°C respectively;

[0052] 5. After the width adjustment starts, the temperatures of the above three thermocouples 4 rise to 260, 235, and 201°C respectively;

[0053] 6. The system sends out an abnormal alarm and automatically reduces the speed to 0.2m / min;

[0054] 7. The operator stopped the width adjustment operation. After the billet came out of the casting m...

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Abstract

The invention discloses a method for avoiding steel breakout caused by extrusion of heat-adjustable billet shells of continuous casting crystallizers. During the pouring process, the thermocouple detects the temperature of the wide-faced copper plate, starts the width adjustment, and starts the judgment model; step 3: judge whether each row of thermocouples has a temperature drop trend during the width adjustment and meets the temperature drop standard; if so, then adjust the width If the billet shell is sunken and given an alarm sign, stop the width adjustment and reduce the pouring speed; if not, continue pouring; step 4: judge whether each column of thermocouples has a temperature rise trend during width adjustment and reaches the temperature rise standard; if it is reached, then When the width is adjusted, the billet shell breaks and an alarm is given, stop the width adjustment and reduce the pouring speed; if it is not reached, continue pouring. The invention can detect steel breakouts caused by depressions and cracks formed after the narrow-side copper plate is extruded on the billet shell during the thermal width adjustment process of the crystallizer, thereby avoiding steel breakout accidents and making production stable and smooth.

Description

technical field [0001] The invention relates to a thermal width adjustment process of a continuous casting crystallizer, in particular to a method for avoiding steel breakout caused by extrusion of a continuous casting crystallizer thermal width adjustment billet shell. Background technique [0002] During the continuous casting pouring process, the part of the molten steel in contact with the copper plate of the mold is cooled immediately after entering the mold to form a primary billet shell. When it exits the mold, the thickness of the billet shell is generally about ten millimeters, and the interior of the billet shell is still in a high-temperature liquid state. The molten steel is completely solidified into a billet before leaving the casting machine. In the process of high-speed thermal width adjustment, the copper plate on the short side of the crystallizer forms a certain extrusion on the billet shell. When the high-strength, high-carbon and high-alloy steel is sque...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18
CPCB22D11/18
Inventor 吴杰赵显久唐惠中白颖
Owner BAOSHAN IRON & STEEL CO LTD
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