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Performance prediction model based dynamic control method for mechanical property of hot strip

A technology for hot-rolled strip steel and forecasting model, which is applied to rolling mill control devices, metal rolling, metal rolling, etc., can solve the problems of complex calculation process, quality requirements of model input data, etc., so as to improve control accuracy and realize dynamic control. Effect

Active Publication Date: 2012-08-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above patents analyzed the microstructure evolution process in the strip rolling process from the perspective of metallurgical mechanism, and established a theoretical model for predicting mechanical properties. The prediction results of the model are only for reference and are not used for any control
Moreover, since the theoretical model includes many simulation calculations of the organizational evolution process, the calculation process is very complicated, and there are quite high requirements on the quality of the model input data

Method used

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  • Performance prediction model based dynamic control method for mechanical property of hot strip
  • Performance prediction model based dynamic control method for mechanical property of hot strip
  • Performance prediction model based dynamic control method for mechanical property of hot strip

Examples

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Effect test

Embodiment 1

[0014] A dynamic control method for the mechanical properties of hot-rolled strip steel based on a performance prediction model. Before the strip steel is rolled, the chemical composition, preset rolling process parameters, and specification parameters are firstly retrieved, and then according to the preset rolling The pre-set coiling temperature in the process parameters calculates the content of precipitated alloy compounds, and then brings all the data into the mechanical property prediction model of hot-rolled strip steel, and uses the model to predict the mechanical properties of strip steel after rolling. The rolling process parameters are used to make the predicted value of the mechanical properties of the strip meet the constraints of the target value of the mechanical properties, and then rolling is carried out according to the adjusted rolling process parameters.

[0015] It should be noted that when the present invention is used for control, there may be a small devi...

Embodiment 2

[0083] The difference between embodiment 2 and embodiment 1 is that, according to the actual results of continuous casting composition detection, the chemical composition of a certain steel strip is as follows:

[0084] : 0.16630, : 0.077, : 0.35, : 0.17, : 0.0098, : 0.0032

[0085] The preset value of process parameter is:

[0086] : 1240°C, : 1040°C, : 990°C, : 850℃, : 650°C

[0087] Thickness specification is 6mm, rough rolling reduction rate : 17.2%, finishing rolling reduction : 15.7%.

[0088]

[0089] 1) Input the collected chemical composition and rolling parameters into the mechanical performance prediction model, and the calculation result is:

[0090] tensile strength Mpa, yield strength MPa

[0091] 2) Compare the predicted values ​​of tensile strength and yield strength with the required mechanical properties, where the thresholds of tensile strength and yield strength are selected as 4Mpa and 5Mpa, respectively.

[0092]

...

Embodiment 3

[0103] The difference between embodiment 3 and embodiment 1 is that, according to the chemical composition detection result of continuous casting molten steel, the composition content of certain strip steel is as follows:

[0104] : 0.0822, : 0.26, : 0.9, : 0.013, : 0.0065, : 0.0032

[0105] The preset value of process parameter is:

[0106] : 1210℃, : 981°C, : 961°C, : 800℃, : 530°C

[0107] Thickness specification is 2.4mm, rough rolling reduction : 11.1%, finishing rolling reduction : 9.7%.

[0108]

[0109] 1) Input the collected chemical composition and rolling process parameters into the mechanical performance prediction model, and the calculation result is:

[0110] Tensile strengthys 1 = 575 Mpa, yield strength ys 2 = 416 MPa

[0111] 2) Compare the predicted values ​​of tensile strength and yield strength with the required mechanical properties, where the thresholds of tensile strength and yield strength are selected as 3Mpa and 4Mp...

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Abstract

The invention belongs to the process control field of a hot rolling slab, and relates to a dynamic control method for the mechanical property of a hot strip. The performance prediction model based dynamic control method for the mechanical property of the hot strip comprises the following steps that: before the rolling of the strip, the chemical composition and the preset processing parameters and specifications for the rolling is firstly taken, then the content of separated alloy compounds is calculated according to a preset coiling temperature in the processing parameters for the rolling, then all the data is carried into the performance prediction model for the mechanical property of the hot strip, the mechanical property of the rolled strip is predicted by using the model, the processing parameters for the rolling are adjusted so that the predicted value of the mechanical property of the strip satisfies the restriction of the target value of the mechanical property, then the rolling is performed according to the adjusted processing parameters for the rolling. The method utilizes the performance prediction model for the mechanical property to dynamically adjust the processing parameters for the rolling of the strip, realizes the dynamic control for the mechanical property of the strip, and improves the qualified rate of hot rolling products and the control precision of the mechanical property.

Description

technical field [0001] The invention belongs to the field of process control of hot-rolled slabs, and relates to a dynamic control method for the mechanical properties of hot-rolled strip steel. Background technique [0002] Mechanical properties are a basic index of hot-rolled strip steel, and users generally have a clear range definition when ordering. Essentially, the mechanical properties are determined by the internal microstructure of the strip, which in turn is determined by the chemical composition and rolling process. According to the traditional production method, the mechanical properties are ensured by controlling the chemical composition in the steelmaking process and the process parameters in the hot rolling process. However, due to the influence of many factors, the chemical composition of molten steel will fluctuate. If the composition deviates from the target value and the production is carried out according to the original rolling process, it is very likel...

Claims

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Application Information

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IPC IPC(8): B21B37/00C21D8/02
Inventor 郭朝晖张群亮苏异才夏瑛
Owner BAOSHAN IRON & STEEL CO LTD
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