Method for predicting initial crack of continuous casting slab upon force analysis

An initial crack and force analysis technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems that cannot truly reflect the mechanical state of the billet shell

Active Publication Date: 2015-03-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To judge the formation of shell cracks, it is necessary to analyze whether the force reaches the critical fracture condition. Simple qualitative analysis cannot truly reflect the mechanical state of the shell, and the existing research still lacks an effective and convenient method for judging the crack formation of the shell

Method used

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  • Method for predicting initial crack of continuous casting slab upon force analysis
  • Method for predicting initial crack of continuous casting slab upon force analysis
  • Method for predicting initial crack of continuous casting slab upon force analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Based on the SSCT test data of low-carbon steel ([C]=0.04%), the relationship between the critical fracture strength of the billet shell in the high temperature zone and the composition of the steel grade is fitted:

[0065] σ max =284.0686*[%C]+0.4863*[%Si]-1.8638*[%Mn]-63.0185*[%P]+115.7562*[%S]+2.9203*[%Al]-0.00805*T int

[0066] In the formula, T int is the initial setting shell temperature, °C;

[0067] Take the steel type ([C]0.04%, [Si]0.1%, [Mn]0.11%, [P]0.013%, [S]0.013%, [Al]0.12%), and calculate the liquidus temperature according to the composition of the steel type (1530.6°C) and solidus temperature (1502.1°C), setting the solid phase fraction of the meniscus solidification front to 0.9, the initial solidification shell temperature of the meniscus is determined to be 1506°C.

[0068] Figure 6 It is the relationship between the critical fracture strength of the low-carbon steel ([C]=0.04%) in the high temperature zone and the temperature. It can be see...

Embodiment 2

[0070] Based on the SSCT test data of medium carbon steel ([C]=0.358%), the relationship between the critical fracture strength of the billet shell in the high temperature zone and the composition of the steel grade is fitted:

[0071] σ max =81.149*[%C]-59.5764*[%Si]+135.887*[%Mn]-737.405*[%S]-1.0844*[%Al]-0.01922*T int

[0072] In the formula, T int is the initial setting shell temperature, °C;

[0073] Take steel grades ([C]0.358%, [Si]0.15%, [Mn]0.14%, [S]0.015%, [Al]0.015%), calculate liquidus temperature (1505℃) and solid The phase line temperature (1414.5°C) and the solid phase fraction of the meniscus solidification front are set to 0.9, then the initial solidification shell temperature of the meniscus is determined to be 1427°C.

[0074] Figure 7 It is the variation relationship of the critical fracture strength of the medium carbon steel ([C]=0.358%) in the high temperature zone with temperature. It can be seen from the figure that the maximum bending stress o...

Embodiment 3

[0076] Based on the SSCT test data of high-carbon steel ([C]=0.701%), the relationship between the critical fracture strength of the billet shell in the high temperature zone and the composition of the steel grade is fitted:

[0077] σ max =-25.613*[%C]-101.345*[%Si]+129.6665*[%Mn]+3246.755*[%P]+176.4084*[%S]+12.502*[%Al]-0.0114*T int

[0078] In the formula, T int is the shell surface temperature, °C;

[0079] Take the steel type ([C]0.701%, [Si]0.52%, [Mn]0.32%, [P]0.011%, [S]0.012%, [Al]0.56%) to calculate its liquidus temperature according to the composition of the steel type (1475°C) and solidus temperature (1319°C), setting the solid phase fraction of the meniscus solidification front to 0.9, it can be determined that the initial solidification shell temperature of the meniscus is 1342°C.

[0080] Figure 8 It is the relationship between the critical fracture strength of the high-carbon steel ([C]=0.701%) in the high temperature zone and the temperature. It can be ...

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Abstract

The invention discloses a method for predicting an initial crack of a continuous casting slab upon force analysis. The method comprises the following steps: determining an initial solidified slab shell load in the vertical throwing direction of a meniscus in a vibration crystallizer; determining mechanical parameters of an initial solidified slab shell, wherein the mechanical parameters comprise the bending moment of a simply supported beam, the inertia moment of the cross section of the simply supported beam and bending stress of the cross section of the simply supported beam; determining the steel grade high-temperature critical breaking strength; predicting the initial crack of the continuous casting slab; if the value of the bending stress of the cross section of the simply supported beam is greater than the obtained steel grade high-temperature critical breaking strength, showing that the initial solidified slab shell load in the vertical throwing direction breaks the strength of the initial solidified slab shell, and the initial crack is generated in the initial solidified slab shell on the meniscus of the current continuous casting slab, and if not, no initial crack is generated in the initial solidified slab shell on the meniscus of the current continuous casting slab. According to the method disclosed by the invention, the vibration effect of the crystallizer is converted into the bending stress borne by the slab shell, and therefore a new idea is provided for analyzing the formation of the crack in the slab shell, and preliminary judgment is conveniently and effectively made on the possibility of the formation of the initial crack of the continuous casting slab.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgical continuous casting process quality control, in particular to a method for predicting initial cracks of continuous casting slabs based on stress analysis. Background technique [0002] Continuous casting slab cracks are the main defects that affect the final quality of steel products. It not only increases the follow-up cleaning process and reduces the metal yield, but also may lead to the scrapping of casting slabs and rolled products, and even lead to steel breakout accidents. The initial solidification area of ​​the meniscus in the vibrating mold of continuous casting is the birthplace of a series of defects such as shell cracks, and the complex mechanical force borne by the shell of the initial solidification is one of the factors that induce the formation of initial cracks. The possibility of crack formation can be judged by clarifying the force state of the billet shell d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 孟祥宁朱苗勇林仁敢杨杰
Owner NORTHEASTERN UNIV
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