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Method for avoiding breakout due to extrusion of slab shell during hot width adjustment of continuous casting mold

A technology for continuous casting mold and thermal width adjustment is applied in the field of avoiding steel breakout caused by extrusion of the thermally adjusted billet shell of the continuous casting mold. To achieve the effect of optimizing moving speed, high applicability, and avoiding steel breakout accidents

Active Publication Date: 2019-10-11
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 for avoiding breakout due to extrusion of slab shell during hot width adjustment of continuous casting mold
  • Method for avoiding breakout due to extrusion of slab shell during hot width adjustment of continuous casting mold
  • Method for avoiding breakout due to extrusion of slab shell during hot width adjustment of continuous casting mold

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Experimental program
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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 breakout due to extrusion of a slab shell during hot width adjustment of a continuous casting mold. The method comprises the step 1 of installing a plurality of rows of thermocouples (4) on the back sides of two wide copper plates (2); the step 2 of detecting the temperature of the wide copper plates through the thermocouples in the casting process, starting to regulate the width, and enabling the judgment model; the step 3 of judging whether each row of thermocouples has a trend of temperature drop during width adjustment and meets the temperaturedrop standards; stopping regulating the width and reducing the casting speed if the thermocouples meet the temperature drop standards, and the slab shell is sunken and marked with a warning sign; continuing casting if the thermocouples fail to meet the temperature drop standards; the step 4 of judging whether each row of thermocouples has a trend of temperature rise during width adjustment and meets the temperature rise standards; stopping regulating the width and reducing the casting speed if the thermocouples meet the temperature rise standards, and the slab shell is cracked and marked withthe warning sign; and continuing casting if the thermocouples fail to meet the temperature rise standards. According to the method, breakout due to sinking and cracking of the slab shell extruded bynarrow copper plates can be detected in the hot width adjustment process of the continuous casting mold, and breakout accidents are avoided, so that the production is performed stably and smoothly.

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 Applications(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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