A general method for processing physical property parameters in temperature simulation

Abstract

The present invention relates to a general method for processing physical property parameters in a temperature simulation process, and belongs to the field of metallurgy technology. The dimension of the physical property parameter space is determined according to the chemical composition of the metal, and each dimension is divided into multiple sub-intervals according to needs. After the division, the sub-intervals of different dimensions constitute a subspace in the physical property parameter space. Each subspace selects a typical chemical composition to calculate the physical property parameters to represent the physical property parameters represented by all chemical composition combinations in the subspace. The relationship between the physical property parameters in the range of 0°C to 1650°C and the chemical composition of the metal is realized, meeting the demand of metallurgical companies for high accuracy of physical property parameters in online real-time simulation of metal products.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy and relates to a general processing method for physical property parameters in a temperature simulation process. Background Art

[0002] The metallurgical process involves the solidification of liquid metal into solid metal. During this process, changes in the metal's temperature are closely related to the quality of the resulting solid metal. Therefore, metallurgists have developed mathematical models to simulate this process online, capturing real-time information about the temperature field during metal temperature simulations.

[0003] The accuracy of these mathematical models is closely related to how the metal's physical properties are processed. To accurately determine the temperature-dependent relationships between the physical properties of metals with varying chemical compositions, some metallurgists have measured the physical properties of metals with specific chemical compositions. Others have fitted these measured data to derive empirical formulas. However, this approach cannot meet the accuracy requirements for physical properties during production.

[0004] In order to solve this problem, some metallurgical workers have done the following work in the steel continuous casting process:

[0005] Liu Qing et al. (Liu Qing et al., A method for simulating the solidification and cooling process of continuous casting billets based on precise physical property parameters, patent number: 201310117067.9) disclosed a method for simulating the solidification and cooling process of continuous casting billets based on precise thermal physical property parameters. Through experiments and summarizing and organizing relevant literature data, a thermal parameter database module for steel was established. Using the regression analysis method, a method for predicting the high-temperature plasticity of steel with chemical composition as the independent variable was formed, forming a thermal physical property parameter database module for steel.

[0006] The above method improves the accuracy to a certain extent, but it also has the following shortcomings:

[0007] 1) The experiment was conducted in the temperature range of 700℃ to 1250℃. There is no relevant data support in the temperature range below 700℃ and above 1250℃.

[0008] 2) It needs to be embedded in the software described in Software Copyright No. 20130117A92844, making it difficult to achieve universal application;

[0009] Ji Cheng et al. (Ji Cheng et al., A continuous casting billet thermal tracking calculation method based on thermophysical property parameter distribution calculation, patent number: CN201710004849.X) disclosed a continuous casting billet thermal tracking calculation method based on thermophysical property parameter distribution calculation, offline acquisition of thermophysical property parameters, the solidification billet shell growth law at the 1 / 2 position in the billet width direction and the relationship between the solidification billet shell growth law at different positions in the billet width direction, one-way coupling of micro and macro, considering the influence of thermophysical property parameters on macro solidification heat transfer, to improve the calculation efficiency, the error between the calculated billet shell thickness and the measured value is about 5%, and the deviation between the surface temperature value and the measured temperature can be controlled within ±10°C.

[0010] The above method is mainly used to solve the impact of different solute segregation distribution on the temperature field simulation results caused by differences in thermophysical parameters, but it does not solve the problem of the impact of different chemical compositions of metals on physical parameters. Summary of the Invention

[0011] In view of this, the purpose of the present invention is to provide a universal processing method for physical property parameters during temperature simulation, realize the relationship between physical property parameters and metal chemical composition in the range of 0℃ to 1650℃, and meet the demand of metallurgical companies for high accuracy of physical property parameters in online real-time simulation of metal products.

[0012] In order to achieve the above object, the present invention provides the following technical solutions:

[0013] A general method for processing physical property parameters during temperature simulation. The method determines the dimension of the physical property parameter space based on the chemical composition of the metal, and divides each dimension into multiple sub-intervals as needed. After division, the sub-intervals of different dimensions constitute a subspace within the physical property parameter space. Typical chemical compositions are selected in each subspace to calculate physical property parameters to represent the physical property parameters represented by all chemical composition combinations in the subspace. The subspace in which the physical property parameters of the metal are located is determined based on the actual chemical composition of the simulated metal, and the physical property parameters of the subspace are selected for simulation calculation.

[0014] Optionally, the metal elements include one or more of C, Si, Mn, P, S, Cr, Ni, Mo, Cu, Al, N, Ti, V, Nb or B.

[0015] Optionally, for the spatial dimensions, each chemical element C, Si, Mn, P, S, Cr, Ni, Mo, Cu, Al, N, Ti, V, Nb, and B is regarded as a dimension, for a total of 15 dimensions.

[0016] Optionally, the dividing each dimension into a plurality of sub-intervals as required is specifically as follows: the number of sub-intervals and the positions of the sub-intervals divided into each dimension are related to the degree of influence of the sub-interval on the physical property parameter.

[0017] Optionally, the number of subintervals and the position of the subintervals in each dimension are related to the degree of influence of the subinterval on the physical property parameter, specifically:

[0018] The C element dimension segmentation interval is as follows:

[0019] C<0.02; 0.02≤C<0.04; 0004≤C<0.07; 0.07≤C<0.09; 0.09≤C<0.12; 0.12≤C<0.15; 0.15≤C<0.17; 0.17≤ C<0.21; 0.21≤C<0.25; 0.25≤C<0.4; 0.45≤C<0.55; 0.55≤C<0.65; 0.65≤C<0.75; 0.75≤C<0.85; 0.85≤C;

[0020] The molecular cutting range of the Mn element is as follows: Mn<0.7; 0.7≤Mn<1.2; 1.2≤Mn<1.8; 1.8≤Mn.

[0021] Optionally, each subspace selects typical chemical components to calculate physical property parameters specifically as follows: a specific chemical component is selected for the subspace to offline calculate the relationship between the physical property parameters and temperature, the temperature range is 0°C to 1650°C, and the physical property parameters include specific heat, thermal conductivity, and density, representing the physical property parameters of any combination of chemical components in the subspace.

[0022] The beneficial effect of the present invention is to realize the relationship between physical property parameters and metal chemical composition in the range of 0°C to 1650°C, and meet the demand of metallurgical companies for high accuracy of physical property parameters in online real-time simulation of metal products.

[0023] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0025] Figure 1 Flowchart of the present invention;

[0026] Figure 2 is the relationship curve between density and temperature;

[0027] Figure 3 is the relationship curve between specific heat (including latent heat) and temperature;

[0028] Figure 4 is the relationship curve between thermal conductivity and temperature. DETAILED DESCRIPTION

[0029] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0030] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] The present invention is applicable to the continuous casting process and provides a universal processing method for physical property parameters in the temperature simulation process, realizing the relationship between physical property parameters and metal chemical composition in the range of 0°C to 1650°C, meeting the demand of metallurgical companies for high accuracy of physical property parameters in online real-time simulation of metal products.

[0033] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] A general method for processing physical property parameters in the temperature simulation process is proposed. Taking the field of metallurgical continuous casting as an example, the relationship between the physical property parameters of steel grades with different chemical compositions and temperature is calculated so that the physical property parameters can be applied in real-time simulation calculation during the continuous casting production process.

[0035] like Figure 1As shown in the figure, the dimension of the physical property parameter space is determined according to the chemical composition of the metal, and each dimension is divided into multiple sub-intervals as needed. After division, the sub-intervals of different dimensions constitute a subspace in the physical property parameter space. Each subspace selects a typical chemical composition to calculate the physical property parameters to represent the physical property parameters represented by all chemical composition combinations in the subspace.

[0036] The chemical composition of the metal includes the main chemical components of the metal. In the field of steel metallurgy, it preferably includes C, Si, Mn, P, S, Cr, Ni, Mo, Cu, Al, N, Ti, V, Nb, and B elements.

[0037] The spatial dimension is determined according to the chemical composition of the metal. Preferably, each chemical element of C, Si, Mn, P, S, Cr, Ni, Mo, Cu, Al, N, Ti, V, and Nb is regarded as a dimension, for a total of 14 dimensions.

[0038] Each dimension is divided into multiple sub-intervals according to the requirements. The number of sub-intervals and the position of the sub-intervals are related to the degree of influence of the interval on the physical property parameters. Taking C and Mn as an example, the sub-intervals of the C element dimension are as follows:

[0039] 1) C < 0.02;

[0040] 2) 0.02≤C<0.04;

[0041] 3) 0004≤C<0.07;

[0042] 4) 0.07≤C<0.09;

[0043] 5) 0.09≤C<0.12;

[0044] 6) 0.12≤C<0.15;

[0045] 7) 0.15≤C<0.17;

[0046] 8) 0.17≤C<0.21;

[0047] 9) 0.21≤C<0.25;

[0048] 10) 0.25≤C<0.4;

[0049] 11) 0.45≤C<0.55;

[0050] 12) 0.55≤C<0.65;

[0051] 13) 0.65≤C<0.75;

[0052] 14) 0.75≤C<0.85;

[0053] 15)0.85≤C

[0054] The Mn element cut molecular interval is as follows:

[0055] 1) Mn<0.7;

[0056] 2) 0.7≤Mn<1.2;

[0057] 3) 1.2≤Mn<1.8;

[0058] 4) 1.8≤Mn;

[0059] Each subspace selects typical chemical components to calculate physical property parameters, taking the following subspace as an example:

[0060] 1) 0.09≤C<0.12;

[0061] 2) 0.00≤Si<1;

[0062] 3) 1.20≤Mn<1.8;

[0063] 4) 0.00≤P<0.03;

[0064] 5) 0.00≤S<0.02;

[0065] 6) 0.00≤Cr<0.1;

[0066] 7) 0.00≤Ni<0.1;

[0067] 8) 0.00≤Mo<0.1;

[0068] 9) 0.00≤Cu<0.1;

[0069] 10) 0.00≤Al<0.06;

[0070] 11) 0.00≤N<0.006;

[0071] 12) 0.00≤Ti<0.01;

[0072] 13) 0.00≤V<0.01;

[0073] 14) 0.00≤Nb<0.01;

[0074] Select a specific chemical composition in this subspace to calculate the relationship between physical properties and temperature offline. Figures 2 to 4 As shown, the temperature range is 0℃~1650℃, and the physical properties include specific heat, thermal conductivity, and density, which represent the physical properties of any chemical composition combination in this subspace.

[0075] The general method for processing physical property parameters during the temperature simulation process is to determine the subspace where the physical property parameters of the metal are located according to the actual chemical composition of the simulated metal, and select the physical property parameters of the subspace for simulation calculation.

[0076] The working principle of this invention is to determine the dimension of the physical property parameter space based on the chemical composition of the metal, and then divide each dimension into multiple subintervals as needed. After division, the subintervals of different dimensions form subspaces within the physical property parameter space. In each subspace, the physical property parameters are calculated by selecting a typical chemical composition to represent the physical property parameters represented by all chemical composition combinations within the subspace. The relationship between physical property parameters and metal chemical composition in the temperature range of 0°C to 1650°C is established, meeting the high accuracy requirements of physical property parameters required by metallurgical companies for online real-time simulation of metal product production.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A general method for processing physical property parameters in a temperature simulation process, characterized by: The method is to determine the spatial dimension of physical property parameters based on the chemical composition of the metal, wherein the metal elements include one or more of C, Si, Mn, P, S, Cr, Ni, Mo, Cu, Al, N, Ti, V, Nb or B; each chemical element is regarded as a dimension, for a total of 15 dimensions; Each dimension is divided into multiple sub-intervals as needed. Specifically, the number of sub-intervals and the position of the sub-intervals for each dimension are related to the degree of influence of the sub-interval on the physical property parameters; wherein: The C element dimension segmentation interval is as follows: C<0.02; 0.02≤C<0.04; 0004≤C<0.07; 0.07≤C<0.09; 0.09≤C<0.12; 0.12≤C<0.15; 0.15≤C<0.17; 0.17≤ C<0.21; 0.21≤C<0.25; 0.25≤C<0.4; 0.45≤C<0.55; 0.55≤C<0.65; 0.65≤C<0.75; 0.75≤C<0.85; 0.85≤C; The molecular cut-off intervals of the Mn element are as follows: Mn<0.7; 0.7≤Mn<1.2; 1.2≤Mn<1.8; 1.8≤Mn; After segmentation, subintervals of different dimensions constitute subspaces in the physical parameter space; The physical property parameters of each subspace are calculated by selecting chemical components: the relationship between the physical property parameters and temperature is calculated offline for a specific chemical component in the subspace, with the temperature range of 0℃ to 1650℃. The physical property parameters include specific heat, thermal conductivity, and density, which represent the physical property parameters of any combination of chemical components in the subspace; The subspace where the physical property parameters of the metal are located is determined according to the actual chemical composition of the simulated metal, and the physical property parameters of the subspace are selected for simulation calculation.

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