Method and device for predicting longitudinal crack of casting blank

A prediction method and longitudinal crack technology, applied in the field of steelmaking and continuous casting, can solve the problems of increasing the amount of casting billet cleaning, cracked steel leakage, jeopardizing production and product quality, etc., reducing the amount of cleaning and the incidence of longitudinal cracks. Effect

Pending Publication Date: 2022-08-05
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Longitudinal cracks increase the amount of slab cleaning, and even lead to cracks and breakouts, seriously endangering production smoothness and product quality

Method used

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  • Method and device for predicting longitudinal crack of casting blank
  • Method and device for predicting longitudinal crack of casting blank
  • Method and device for predicting longitudinal crack of casting blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] The carbon content in the billet is 0.09%, the thickness of the billet is 237mm, the width is 1200mm, and the pulling speed Vc is stably controlled at 1.4m / min. Install thermocouples on the wide and narrow sides of the copper plate of the mold. The thermocouples are installed at 111mm intervals in the thickness direction of the slab and 185mm in the width direction. The row spacing of the first row of thermocouples and the second row of thermocouples is 111mm. The row spacing of the second row of thermocouples and the third row of thermocouples is 185mm, with 9 rows of wide-face thermocouples and 2 rows of narrow-face thermocouples; both wide-face and narrow-face thermocouples are 6 rows. The copper plate temperature acquisition system collects the temperature measurement data of the thermocouples installed on the wide and narrow sides of the copper plate every 0.06s, and matches the pulling speed, reads and analyzes the temperature-time correspondence map every 70s; fin...

Embodiment 2

[0083] The carbon content in the slab is 0.10%, the slab thickness is 230mm, the width is 1200mm, and the pulling speed Vc is stably controlled at 1.5m / min. Thermocouples are installed on the wide and narrow sides of the mold copper plate, and the thermocouples are spaced in the slab thickness direction. 115mm installation, installation at 115mm intervals in the width direction of the slab, 11 rows of thermocouples in the width direction, 1 row of thermocouples in the thickness direction; 3 rows of thermocouples in the width direction and thickness direction. The copper plate temperature acquisition system measures the temperature data on the surface of the billet every 0.05s and matches the pulling speed, reads and analyzes the temperature-time correspondence map every 75s; finds out the temperature of all thermocouples in the first three rows within the predicted time T The maximum value of T max and the minimum value T min , calculate the difference between the maximum and...

Embodiment 3

[0086]The carbon content in the slab is 0.08%, the slab thickness is 237mm, the width is 1100mm, and the pulling speed Vc is stably controlled at 1.7m / min. Install thermocouples in the width direction and thickness direction of the mold copper plate respectively. The thermocouples are controlled at 111mm laterally and 185mm in the width direction. The spacing between the first row of thermocouples and the second row of thermocouples is 111mm. The row spacing between the row thermocouples and the third row thermocouples is 185mm, with 9 rows of wide-face thermocouples and 2 rows of narrow-face thermocouples; both wide-face and narrow-face thermocouples are 6 rows. The copper plate temperature acquisition system collects the temperature measurement data of the thermocouples installed on the wide and narrow sides of the copper plate every 0.06s, and matches the pulling speed, and reads and analyzes the temperature-time correspondence map every 85s; find out the T time period The ...

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Abstract

The invention discloses a casting blank longitudinal crack prediction method and device, and the method comprises the steps: obtaining at least three groups of temperature data of a target prediction position of a crystallizer copper plate, each group of temperature data at least comprises two temperature values, and each temperature value corresponds to different collection time; correspondingly obtaining time offset of adjacent groups and temperature deviation of each group according to the acquisition time and the temperature value of the temperature data; and if the temperature deviation and the time offset meet a preset condition, determining that the longitudinal crack exists in the target prediction position. According to the method, at least three groups of temperature data and acquisition time are acquired at the target prediction position of the casting blank, so that whether the concave morphology appears repeatedly at the target prediction position or not is determined, and the longitudinal crack exists at the target prediction position is determined after the temperature deviation and the time offset meet the preset conditions, so that accurate prediction of the longitudinal crack at the target prediction position is achieved.

Description

technical field [0001] The present application relates to the technical field of steelmaking and continuous casting, and in particular, to a method and device for predicting longitudinal cracks in a slab. Background technique [0002] Due to the presence of peritectic reaction (δ+L→γ) in subperitectic steel and steel with high aluminum content, it is easy to shrink during continuous slab casting and form air gaps. The non-uniformity of the air gap leads to the non-uniform solidification of the shell and the non-uniform temperature gradient distribution. Under the action of various complex factors such as hydrostatic pressure, thermal stress, friction, etc., cracks form and develop in the weak part of the billet shell. Longitudinal cracks increase the amount of billet cleaning, and even lead to cracks and breakouts, which seriously endangers production and product quality. [0003] Therefore, how to accurately predict the longitudinal crack of the slab is a technical proble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00G06F17/18
CPCB22D11/00G06F17/18Y02P90/30
Inventor 邓小旋刘柏松李海波刘国梁朱国森季晨曦陈斌邵肖静吕迺冰郝宁罗衍昭
Owner SHOUGANG CORPORATION
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