CN110791634A - Method for accurately regulating austenite grain size of low-temperature pressure vessel steel hot rolled plate - Google Patents
Method for accurately regulating austenite grain size of low-temperature pressure vessel steel hot rolled plate Download PDFInfo
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- CN110791634A CN110791634A CN201911028114.6A CN201911028114A CN110791634A CN 110791634 A CN110791634 A CN 110791634A CN 201911028114 A CN201911028114 A CN 201911028114A CN 110791634 A CN110791634 A CN 110791634A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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Abstract
The invention discloses a method for accurately regulating and controlling austenite grain size of a low-temperature pressure vessel steel hot rolled plate, which relates to the technical field of material processing, and can judge the grain refinement degree and the grain uniformity under different deformation and different rolling temperatures according to the obtained thermal deformation structure process relationship, thereby formulating a rolling process and performing excellent distribution on rolling passes so as to achieve good control on the rolling process.
Description
Technical Field
The invention relates to the technical field of material processing, in particular to a method for accurately regulating and controlling austenite grain size of a low-temperature pressure vessel steel hot rolled plate.
Background
With the continuous development of science and technology, the requirements of various industries on materials are higher and higher, particularly the requirements on the strength, low-temperature impact toughness and weldability of medium-thickness steel plates are higher and higher, and the performance of the steel plates rolled by the traditional rolling process cannot meet the required requirements. Particularly, the steel sheets rolled by the container steel, such as 07MnNiMoDR, are used for manufacturing containers for containing dangerous liquids and gases, such as propylene, liquefied petroleum gas, etc., and the leakage of the steel sheets causes environmental pollution and safety problems, so the requirements on the performance of the steel sheets are higher. As is well known, the structure determines the performance, so that uniform and fine structures are necessary to obtain, for low-carbon low-alloy steel, the structure regulation and control process mainly depends on deformation and subsequent heat treatment, and the structure has inheritance, so that the method has important significance for obtaining the uniform and fine deformed structures.
The current plate rolling process is mainly formulated by two major methods, namely a theoretical method and an empirical method. In general, an empirical method is mainly adopted to set a rolling process in medium plate production, and the basic steps are as follows: selecting proper blank size specification, determining a rolling mode and each pass reduction according to an empirical method, checking the biting capacity one by one, establishing a speed system, and calculating each pass rolling time and each pass rolling temperature. The medium plate is usually rolled by a continuous casting billet, the continuous casting billet has the defects of uneven components and structures and the like, the defects sometimes cannot be improved by a rolling process established by an empirical method, and the size and uniformity of the rolled crystal grains sometimes cannot reach the expected targets and have great instability. If the spot test is needed, the process structure characteristics of the test steel are researched, the cost of the large-size continuous casting billet is high, energy and materials are wasted, the point taking test detection of the rolled steel plate is troublesome, and the period is long.
Therefore, a method for accurately controlling the change rule of the grain size in the thermal deformation process is needed, the cost is reduced, the test period is shortened, and the structure performance of the rolled plate is improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for accurately regulating and controlling the austenite grain size of a hot rolled plate of low-temperature pressure vessel steel, which comprises the following steps:
s1, preliminarily preparing a large-size blank rolling process;
s2, determining the size of a small-size test material, wherein the length of the test material is more than four times of the length of a deformation area of the test rolling mill, and the thickness of the test material is reduced according to the thickness of a field blank so as to meet the parameter requirements of the test rolling mill;
s3, carrying out numerical simulation on different rolling processes by using a 3D finite element simulation method to obtain a distribution rule of thermal parameters of the test material under different temperature and reduction rate conditions;
s4, performing a rolling test of small-size blanks, performing corrosion and structure observation tests on rolled plates, counting the sizes of austenite grains at different thicknesses of the rolled plates, calculating the variance of the sizes of the austenite grains to express the uniformity of the grains, and establishing a corresponding relation between the thermal parameters of the test materials and the sizes and the uniformity of the austenite grains after rolling by combining the thermal parameters under different process parameters obtained in the step S3;
s5, carrying out numerical simulation of the on-site large-size blank rolling process to obtain the thermal parameters of the on-site large-size blank after rolling, and repeatedly optimizing the large-size blank rolling process by combining the thermal parameters obtained in the step S4 with the corresponding relation between the size of the austenite grains after rolling and the uniformity of the austenite grains until ideal thermal parameters, namely the size and the uniformity of the austenite grains are obtained;
and S6, determining the process parameters of the large-size blank according to the step S4 and the step S5.
The technical effects are as follows: according to the obtained thermal deformation structure process relationship, the invention can judge the grain refinement degree and the grain uniformity under different deformation and different rolling temperatures, thereby formulating the rolling process and carrying out excellent distribution on rolling passes so as to achieve good control on the rolling process.
The technical scheme of the invention is further defined as follows:
further, in step S4, a rolling test of the small-sized blank is performed, and the sheet material should be immediately water-cooled after rolling to retain the deformed prior austenite grain boundary.
The 3D finite element simulation method specifically comprises the steps of establishing a three-dimensional model according to the size of a test device, inputting a material stress-strain curve and related physical property parameters measured by a test into simulation software, setting related parameters, operating the software, and obtaining the distribution rule of the thermal parameters of the test material under different temperature and reduction ratios by utilizing post-processing software after the calculation is finished.
The method for accurately regulating and controlling the austenite grain size of the hot rolled plate of the low-temperature pressure vessel steel adopts Simufact or Deform as simulation software.
According to the method for accurately regulating and controlling the austenite grain size of the hot rolled plate of the low-temperature pressure vessel steel, the set related parameters comprise the rotating speed of a roller, the rolling temperature, the friction coefficient between a workpiece and a blank and the test environment temperature.
The method for accurately regulating and controlling the austenite grain size of the hot rolled plate of the low-temperature pressure vessel steel is used for rolling a 07MnNiMoDR steel plate, and specifically comprises the following steps
S1, preliminarily preparing a large-size blank rolling process;
s2, testing by using a phi 160X 200mm two-roll reversible mill, wherein the size of the on-site blank is 260X 2070X 3420mm, and the size of the small-size test material is 33X 100X 300 mm;
s3, carrying out numerical simulation on different rolling processes by using a 3D finite element simulation method, wherein the rolling temperature is 900-1150 ℃, and the reduction rate is 10-15%; establishing a three-dimensional model according to the size of a test device, inputting a material stress-strain curve measured in the test and related physical property parameters into simulation software, setting the rotation speed of a roller to be 30-40 r/min, the rolling temperature to be 900-1150 ℃, the friction coefficient between a workpiece and a blank to be 0.6-0.8 and the test environment temperature to be 20-30 ℃, operating the software, and obtaining the distribution rule of the thermal parameters of the test material under the conditions of different temperatures and reduction ratios by utilizing post-processing software after the calculation is finished;
s4, performing a rolling test on the small-size blank, immediately cooling the rolled plate by water to retain the original austenite crystal boundary after deformation, performing corrosion and tissue observation tests on the rolled plate, counting the sizes of austenite crystal grains at different thicknesses of the rolled plate, calculating the variance of the sizes of the austenite crystal grains to express the uniformity of the crystal grains, and establishing the corresponding relation between the thermal parameters of the test material and the sizes and the uniformity of the austenite crystal grains after rolling by combining the thermal parameters under different process parameters obtained in the step S3;
s5, carrying out numerical simulation on an on-site large-size blank rolling process, wherein the initial rolling temperature is 1100 ℃, the final rolling temperature is 800 ℃, and the total reduction rate is 81.9%, obtaining the corresponding relation between the rolling temperature and the strain of the on-site large-size blank rolled thermal parameters, and repeatedly optimizing the large-size blank rolling process by combining the corresponding relation between the thermal parameters obtained in the step S4 and the sizes and the uniformity of rolled austenite crystal grains until ideal thermal parameters are obtained, so that the grain size of the rolled austenite crystal grains reaches about 8 grades, and the grain size variance is less than 4;
s6, determining the technological parameters of the large-size blank according to the steps S4 and S5, rolling in a later two-phase region, controlling the total reduction rate to be more than 50%, controlling the rolling passes to be 3-5 passes, controlling the reduction rate of each pass to be more than or equal to 15%, and controlling the rolling temperature of the last two passes to be more than or equal to 830 ℃.
The invention has the beneficial effects that: the invention discloses a method for accurately regulating and controlling the size of austenite crystal grains in the hot rolling process of low-temperature pressure vessel steel, which is characterized in that numerical simulation and rolling test are carried out on small-size blanks to obtain the relation between the change rule of test steel structure crystal grains in the rolling process and rolling process parameters, so that an accurate rolling process is formulated, the accurate control on steel rolling is achieved, a plate with better structure performance is obtained, and the test cost and the test period are reduced.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of a rolling deformation zone of a plate according to the present invention;
FIG. 3 is a schematic view of a three-dimensional model of a rolling test according to the present invention;
FIG. 4 is a schematic view of a rolling test strain field in the present invention;
FIG. 5 is a schematic view of the grain structure after the rolling test in the present invention;
FIG. 6 is a schematic view showing the structure of the thermal processing of the present invention.
Detailed Description
In the method for accurately regulating and controlling austenite grain size of a hot rolled plate of low-temperature pressure vessel steel provided by this embodiment, as shown in fig. 1, a 07MnNiMoDR steel plate rolling process is taken as an example, and includes the following steps:
s1, preliminarily preparing a large-size blank rolling process;
s2, determining the size of a small-size test material, wherein the length of the test material is more than four times of the length of a deformation zone of the test rolling mill, as shown in figures 2 and 3, the thickness of the test material is reduced according to the thickness of an on-site blank so as to meet the parameter requirements of the test rolling mill, therefore, the test adopts a phi 160 x 200mm two-roll reversible rolling mill, the size of the on-site blank is 260 x 2070 x 3420mm, and the size of the small-size test material is 33 x 100 mm;
s3, carrying out numerical simulation on different rolling processes (the rolling temperature is 900-1150 ℃ and the reduction rate is 10-15%) by using a 3D finite element simulation method, establishing a three-dimensional model according to the size of a test device, inputting a material stress-strain curve and related physical parameters measured by the test into simulation software (Simufact, Deform and the like), setting related parameters such as the roller rotation speed (30-40 r/min), the rolling temperature (900-1150 ℃) and the friction coefficient (0.6-0.8) between a workpiece and a blank, the test environment temperature (20-30 ℃) and the like, operating the software, and obtaining the distribution rule of thermal parameters (strain fields) of the test material under different temperature and reduction rate conditions by using post-processing software after the calculation is finished, wherein the distribution rule is shown in figure 4;
s4, performing a rolling test on the small-size blank, immediately cooling the rolled plate by water to retain the original austenite crystal boundary after deformation, performing corrosion and structure observation tests on the rolled plate, counting the sizes of austenite crystal grains at different thicknesses of the rolled plate, as shown in FIG. 5, calculating the variance of the sizes of the crystal grains to represent the uniformity of the crystal grains, and establishing a corresponding relation between the thermal parameters of the test material and the sizes and the uniformity of the austenite crystal grains after rolling by combining the thermal parameters (strain fields) under different process parameters obtained in the step S3, as shown in FIG. 6;
s5, carrying out numerical simulation on an on-site large-size blank rolling process (the initial rolling temperature is 1100 ℃, the final rolling temperature is 800 ℃, and the total reduction rate is 81.9%) to obtain thermal parameters (the corresponding relation between the rolling temperature and strain) of an on-site large-size blank (260X 2070X 3420 mm) after rolling, and repeatedly optimizing the large-size blank rolling process by combining the thermal parameters obtained in the step S4 and the corresponding relation between the size and the uniformity of rolled austenite crystal grains until ideal thermal parameters are obtained, so that the grain size of the rolled austenite crystal grains reaches about 8 grades, and the grain size variance is less than 4;
s6, determining the technological parameters of the large-size blank according to the step S4 and the step S5 (the total reduction rate of the two-phase region rolling in the later period is more than 50 percent, the rolling passes are controlled to be 3-5 passes, the reduction rate of each pass is not less than 15 percent, and the temperature of the two-pass rolling is not less than 830 percent).
The relationship between the change rule of the test steel structure crystal grain in the rolling process and the rolling process parameters is obtained by carrying out numerical simulation and rolling test on the small-size blank, so that the accurate rolling process is formulated, the accurate control on the rolling of steel is achieved, the plate with better structure performance is obtained, and the test cost and the test period are reduced.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. The method for accurately regulating and controlling the austenite grain size of the low-temperature pressure vessel steel hot rolled plate is characterized by comprising the following steps of: the method comprises the following steps:
s1, preliminarily preparing a large-size blank rolling process;
s2, determining the size of a small-size test material, wherein the length of the test material is more than four times of the length of a deformation area of the test rolling mill, and the thickness of the test material is reduced according to the thickness of a field blank so as to meet the parameter requirements of the test rolling mill;
s3, carrying out numerical simulation on different rolling processes by using a 3D finite element simulation method to obtain a distribution rule of thermal parameters of the test material under different temperature and reduction rate conditions;
s4, performing a rolling test of small-size blanks, performing corrosion and structure observation tests on rolled plates, counting the sizes of austenite grains at different thicknesses of the rolled plates, calculating the variance of the sizes of the austenite grains to express the uniformity of the grains, and establishing a corresponding relation between the thermal parameters of the test materials and the sizes and the uniformity of the austenite grains after rolling by combining the thermal parameters under different process parameters obtained in the step S3;
s5, carrying out numerical simulation of the on-site large-size blank rolling process to obtain the thermal parameters of the on-site large-size blank after rolling, and repeatedly optimizing the large-size blank rolling process by combining the thermal parameters obtained in the step S4 with the corresponding relation between the size of the austenite grains after rolling and the uniformity of the austenite grains until ideal thermal parameters, namely the size and the uniformity of the austenite grains are obtained;
and S6, determining the process parameters of the large-size blank according to the step S4 and the step S5.
2. The method for accurately regulating and controlling the austenite grain size of the hot rolled plate of the low-temperature pressure vessel steel as claimed in claim 1, is characterized in that: in the step S4, a rolling test of the small-sized blank is performed, and the sheet material should be immediately cooled by water after rolling to retain the original austenite grain boundary after deformation.
3. The method for accurately regulating and controlling the austenite grain size of the hot rolled plate of the low-temperature pressure vessel steel as claimed in claim 1, is characterized in that: the 3D finite element simulation method specifically comprises the steps of establishing a three-dimensional model according to the size of a test device, inputting a material stress-strain curve measured in a test and related physical property parameters into simulation software, setting related parameters, operating the software, and obtaining a thermodynamic parameter distribution rule of the test material under different temperature and reduction rate conditions by utilizing post-processing software after calculation is finished.
4. The method for accurately regulating and controlling the austenite grain size of the hot rolled plate of the low-temperature pressure vessel steel as claimed in claim 3, wherein the method comprises the following steps: the simulation software adopts Simufact or Deform.
5. The method for accurately regulating and controlling the austenite grain size of the hot rolled plate of the low-temperature pressure vessel steel as claimed in claim 3, wherein the method comprises the following steps: the set relevant parameters comprise the rotating speed of the roller, the rolling temperature, the friction coefficient between the workpiece and the blank and the test environment temperature.
6. The method for accurately regulating and controlling the austenite grain size of the hot rolled plate of the low-temperature pressure vessel steel as claimed in claim 3, wherein the method comprises the following steps: a07 MnNiMoDR steel plate is prepared from
S1, preliminarily preparing a large-size blank rolling process;
s2, testing by using a phi 160X 200mm two-roll reversible mill, wherein the size of the on-site blank is 260X 2070X 3420mm, and the size of the small-size test material is 33X 100X 300 mm;
s3, carrying out numerical simulation on different rolling processes by using a 3D finite element simulation method, wherein the rolling temperature is 900-1150 ℃, and the reduction rate is 10-15%; establishing a three-dimensional model according to the size of a test device, inputting a material stress-strain curve measured in the test and related physical property parameters into simulation software, setting the rotation speed of a roller to be 30-40 r/min, the rolling temperature to be 900-1150 ℃, the friction coefficient between a workpiece and a blank to be 0.6-0.8 and the test environment temperature to be 20-30 ℃, operating the software, and obtaining the distribution rule of the thermal parameters of the test material under the conditions of different temperatures and reduction ratios by utilizing post-processing software after the calculation is finished;
s4, performing a rolling test on the small-size blank, immediately cooling the rolled plate by water to retain the original austenite crystal boundary after deformation, performing corrosion and tissue observation tests on the rolled plate, counting the sizes of austenite crystal grains at different thicknesses of the rolled plate, calculating the variance of the sizes of the austenite crystal grains to express the uniformity of the crystal grains, and establishing the corresponding relation between the thermal parameters of the test material and the sizes and the uniformity of the austenite crystal grains after rolling by combining the thermal parameters under different process parameters obtained in the step S3;
s5, carrying out numerical simulation on an on-site large-size blank rolling process, wherein the initial rolling temperature is 1100 ℃, the final rolling temperature is 800 ℃, and the total reduction rate is 81.9%, obtaining the corresponding relation between the rolling temperature and the strain of the on-site large-size blank rolled thermal parameters, and repeatedly optimizing the large-size blank rolling process by combining the corresponding relation between the thermal parameters obtained in the step S4 and the sizes and the uniformity of rolled austenite crystal grains until ideal thermal parameters are obtained, so that the grain size of the rolled austenite crystal grains reaches about 8 grades, and the grain size variance is less than 4;
s6, determining the technological parameters of the large-size blank according to the steps S4 and S5, rolling in a later two-phase region, controlling the total reduction rate to be more than 50%, controlling the rolling passes to be 3-5 passes, controlling the reduction rate of each pass to be more than or equal to 15%, and controlling the rolling temperature of the last two passes to be more than or equal to 830 ℃.
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Cited By (5)
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| CN111872116A (en) * | 2020-07-28 | 2020-11-03 | 西安建筑科技大学 | Hot continuous rolling parameter determination method for clearly considering structural performance target requirement |
| CN112044952A (en) * | 2020-08-13 | 2020-12-08 | 西北工业大学 | 3D-SPD (three-dimensional-spring-spraying) ultrafine crystal bar forming method of F + P type non-quenched and tempered steel |
| CN112044953A (en) * | 2020-08-13 | 2020-12-08 | 西安晟东锻压有限公司 | Method and model for predicting grain size of large-size medium-carbon steel ultrafine grain bar |
| CN115724422A (en) * | 2021-08-26 | 2023-03-03 | 北京大学 | Method for selectively growing carbon nano-tube on wafer size substrate |
| CN112560303B (en) * | 2020-12-01 | 2023-12-15 | 南京钢铁股份有限公司 | Method for verifying quenching system of low-temperature pressure container steel |
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Application publication date: 20200214 |