CN110394363B - Production method for rolling high-quality carbon structural steel with thickness of more than or equal to 60mm by utilizing wide and thick plate finishing mill at differential temperature - Google Patents

Production method for rolling high-quality carbon structural steel with thickness of more than or equal to 60mm by utilizing wide and thick plate finishing mill at differential temperature Download PDF

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CN110394363B
CN110394363B CN201910709690.0A CN201910709690A CN110394363B CN 110394363 B CN110394363 B CN 110394363B CN 201910709690 A CN201910709690 A CN 201910709690A CN 110394363 B CN110394363 B CN 110394363B
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thickness
temperature
intermediate blank
finished product
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CN110394363A (en
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习天辉
黄大军
杜涛
卜勇
尹云洋
苏亮
张欢
严明
鲍海燕
何亚元
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Baowu Group Echeng Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling

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Abstract

The invention discloses a production method for rolling high-quality carbon structural steel with the thickness of more than or equal to 60mm by utilizing a wide and thick plate finishing mill at differential temperature, which comprises the processes of casting blank heating, rough rolling, forced cooling and finish rolling, wherein in the rough rolling stage, intermediate blanks with different thicknesses are obtained according to the thickness of a finished product, and in the forced cooling stage, according to the thicknesses of the different intermediate blanks, the intermediate blanks are subjected to forced water spray cooling by high-pressure dephosphorization water equipment carried by the finishing mill until the surface temperature and the core temperature of the intermediate blanks generate differential temperature; in the finish rolling stage, finishing differential temperature rolling by controlling the first pass reduction amount of finish rolling, and then finishing forming pass rolling; the method of the invention integrates the differential temperature rolling process into the finish rolling process by utilizing the high-pressure phosphorus removal water system of the finish rolling mill, thereby improving the deformation of the center of the intermediate billet, improving the internal quality and avoiding the layering phenomenon; the defects of the rolled piece in the shape of a lateral double drum and the like are reduced, the yield is improved, the mechanical properties of the surface layer and the core meet the requirements of technical standards, and the process performance is good.

Description

Production method for rolling high-quality carbon structural steel with thickness of more than or equal to 60mm by utilizing wide and thick plate finishing mill at differential temperature
Technical Field
The invention relates to the technical field of steel materials, in particular to a production method for rolling high-quality carbon structural steel with the thickness of more than or equal to 60mm by utilizing a wide and thick plate finishing mill at different temperatures.
Background
The high-quality carbon structural steel with the thickness not less than 60mm belongs to the category of extra-thick plates, and even if the market of medium-thick plates is totally surplus, the market demand is still vigorous. Downstream users of metallurgical enterprises purchase high-quality carbon structural steel with the thickness not less than 60mm, and the high-quality carbon structural steel is usually subjected to secondary processing and then widely applied to various fields of national economy. In the process of producing the high-quality carbon structural steel extra-thick plate with the thickness not less than 60mm, important attention is paid to internal quality (no layering), surface quality and yield.
The differential temperature rolling technology is a rolling technology for producing ultra-thick steel plates developed in recent years, and has the following advantages: 1. the dependence on thick specification blanks is reduced, and the steel plate with the thickness not less than 60mm can be produced by a smaller compression ratio; 2. the deformation of the core of the thick steel plate can be improved, the internal quality can be improved, and the common layering phenomenon in the production process of high-quality carbon structural steel with the thickness of not less than 60mm can be avoided; 3. the bulging at the edge of the steel plate is reduced, and the yield is improved; 4. the scale generated due to higher finish rolling temperature in the production process of high-quality carbon structural steel is inhibited, the surface quality of the steel plate is improved, and the scale on the surface of the steel plate produced by the differential temperature rolling method is uniform and continuous and is not easy to peel; the mechanical properties of the surface layer and the core part meet the requirements of technical standards, the abundance is reasonable, and the process performance is good.
In recent years, documents and patents relating to differential temperature rolling technology are rare, and the design ideas of differential temperature rolling processes disclosed at present are to add a cooling device to a rolling production line to cool a billet so as to achieve the purpose that the surface temperature of a steel plate is different from the core temperature, such as:
CN204396487U cooling device used in the method for improving the deformation permeability of thick steel plate in hot rolling process and CN202824183U cooling device used in the differential temperature rolling of aluminum alloy medium and heavy plate are both a uniform and rapid cooling device specially arranged on the rolling production line, and then the length of the cooling segment, the arrangement form and the inclination angle of the cooling nozzle, and even the amount of cooling water are described.
CN104588413A "heating device for differential and isothermal rolls and rolling method", the heating range of the rolls to be used for differential rolling is limited (between room temperature and 550 ℃), and the control range of the difference between the surface temperatures of the upper and lower rolls (20-200 ℃) is also limited. The invention provides a differential temperature and isothermal roller heating device and a rolling method, which solve the problem that the difficult-to-form metal material is difficult to finish rolling due to large deformation resistance and poor plasticity in the cold rolling process by continuously heating an online roller. Although the invention and the scheme adopt a 'differential temperature' method, the realization means and the application field are completely different.
CN104525588A "a method for improving the deformation permeability of thick steel plate in hot rolling" adds a cooling device and describes the configuration parameters, carries out asymmetric rapid uniform cooling on the upper and lower surfaces of the blank to form a surface hardening layer, the temperature gradient with the core reaches 2-3 ℃/mm, and carries out differential temperature rolling as soon as possible before cooling and re-reddening, thereby improving the core deformation of the blank. For steel grades needing two-stage controlled rolling, the uniform and rapid cooling device can replace intermediate cooling, shorten or even eliminate the time for waiting for temperature, and improve the production efficiency. The technical scheme provided by the invention is still realized by adding a cooling device, and the requirement is provided for the added total cooling water amount, so that the capacity of water treatment equipment of a steel rolling mill is required to be enlarged, and the investment is increased.
Through research and comparison of the prior art, the existing differential temperature rolling process is found to be that a cooling device is additionally arranged in the rolling process to rapidly cool the blank to form a surface hardening layer, a temperature difference is formed between the surface hardening layer and the core part, and differential temperature rolling is performed as soon as possible before the blank is cooled and re-reddened. Although they can realize differential temperature rolling, the cooling device is required to be added, and the cooling waiting time is required, so that the optimal design of the process is not achieved in terms of process simplicity and resource conservation. Therefore, the novel differential temperature rolling process for the wide and thick steel plate is provided, and has very important significance for improving the differential temperature rolling process technology in the industry.
Disclosure of Invention
The invention aims to provide a production method for rolling high-quality carbon structural steel with the thickness of more than or equal to 60mm by utilizing a wide and thick plate finishing mill at different temperatures, aiming at the problems that the existing ultra-thick steel plates which are rolled at different temperatures need to be additionally provided with cooling devices and need to be kept at the temperature for a long time, so that the waste of production resources is caused and the production efficiency is low.
The invention relates to a production method for rolling high-quality carbon structural steel with the thickness of more than or equal to 60mm by using a wide and thick plate finishing mill at different temperatures, which comprises the processes of casting blank heating, rough rolling, forced cooling and finish rolling, and is particularly characterized in that:
(1) the casting blank is heated to 1250 +/-30 ℃ and the soaking time is more than or equal to 30 min;
(2) the rough rolling is to perform rough rolling on the heated casting blank to prepare an intermediate blank according to the thickness of the casting blank and the thickness of a finished product to be rolled, and the rolling requirement of the intermediate blank is as follows:
a. when the thickness of the finished product is more than or equal to 60-80 mm, the thickness of the intermediate blank is 1.5-2.0 times of the thickness of the finished product, and the temperature of the intermediate blank after rough rolling is 1050-1100 ℃;
b. when the thickness of the finished product is more than or equal to 80-120 mm, the thickness of the intermediate blank is 1.3-1.6 times of the thickness of the finished product, and the temperature of the intermediate blank after rough rolling is 1080-1130 ℃;
c. when the thickness of the finished product is more than or equal to 120-180 mm, the thickness of the intermediate blank is 1.1-1.4 times of the thickness of the finished product, and the temperature of the intermediate blank after rough rolling is 1100-1150 ℃;
(3) the forced cooling is to cool the intermediate billet by high-pressure water by utilizing high-pressure descaling water of a wide and thick plate four-roller reversible finishing mill, and specifically comprises the following steps:
a. when the thickness of the finished product is more than or equal to 60-80 mm, spraying high-pressure descaling water for 3 times to the intermediate blank, wherein the water spraying amount is 320-380 m each time3Controlling the temperature of the intermediate blank sprayed with water each time to be 80-90 ℃ until the surface temperature of the intermediate blank is reduced to 780-860 ℃;
b. when the thickness of the finished product is more than or equal to 80-120 mm, spraying high-pressure descaling water for 4 times, wherein the water spraying amount is 280-360 m each time3Control each timeThe temperature of the secondary water spraying intermediate blank is reduced to 70-80 ℃ until the surface temperature of the intermediate blank is reduced to 760-850 ℃;
c. when the thickness of the finished product is more than or equal to 120-180 mm, spraying high-pressure descaling water for 5 times to the intermediate blank, wherein the thickness is 240-300 m3Controlling the temperature of the intermediate blank sprayed with water each time to be 60-70 ℃ until the surface temperature of the intermediate blank is reduced to 750-850 ℃;
(4) the finish rolling is that after high-pressure water cooling of the intermediate blank is completed, the surface temperature of the intermediate blank is rapidly cooled to 750-860 ℃ from 1050-1150 ℃, the core temperature of the intermediate blank is basically unchanged, the surface temperature and the core temperature of the intermediate blank have 240-350 ℃, and then the intermediate blank rapidly enters the finish rolling stage for rolling, and specifically:
a. when the thickness of the finished product is more than or equal to 60-80 mm, the first-pass rolling reduction of finish rolling is more than or equal to 25 mm; then, the surface of the rolled piece returns to the temperature, the core temperature is reduced to 990-1040 ℃, and then forming pass rolling is completed;
b. when the thickness of the finished product is more than or equal to 80-120 mm, the first-pass rolling reduction of finish rolling is more than or equal to 23 mm; then, the surface of the rolled piece is returned to the temperature, the core temperature is reduced to 1030-1080 ℃, and then forming pass rolling is completed;
c. when the thickness of the finished product is more than or equal to 120-180 mm, the first-pass rolling reduction of finish rolling is more than or equal to 20 mm; and then, the surface of the rolled piece returns to the temperature, the core temperature is reduced to 1050-1100 ℃, and then the forming pass rolling is completed.
The invention adopts a two-stage rolling method, firstly, a heated casting blank is roughly rolled into an intermediate blank, then, the intermediate blank is rapidly cooled by utilizing a high-pressure dephosphorization water system of a finishing mill, and then, the finishing mill is rapidly utilized to finish the differential temperature rolling of the second stage. The aim of differential temperature rolling is achieved by controlling the thickness of the blank in the two-stage rolling process, the pass of water spraying during forced cooling and the water spraying amount, controlling the temperature difference between the surface temperature and the central temperature of the blank and the rolling reduction of the first pass of finish rolling, and the high-quality carbon structural steel plate with excellent comprehensive quality and thickness not less than 60mm is obtained. In the differential temperature rolling process, the surface layer and the core of the intermediate billet have temperature difference, the differential temperature rolling improves the deformation of the core of the intermediate billet, so that the center defect of the thick plate is easier to close, the internal quality is improved, the layering phenomenon is avoided, the plate shape defects of the lateral double-drum shape and the like of a rolled piece are reduced, the yield is improved, the surface quality is excellent, and the production efficiency is improved by shortening or even eliminating the time for waiting for temperature.
Compared with the prior art, the invention has the following advantages:
(1) the high-pressure descaling water system of the wide and thick plate finishing mill is used for realizing differential temperature rolling without adding an inter-pass cooling device;
(2) the internal quality is improved, and the common layering phenomenon in the production process of high-quality carbon structural steel with the thickness of more than or equal to 60mm is avoided;
(3) the defects of plate shapes such as lateral double drum shapes and the like of the rolled piece are reduced, and the yield is improved;
(4) the scale generated due to higher finish rolling temperature in the production process of high-quality carbon structural steel with the thickness of more than or equal to 60mm is inhibited, the surface quality of the steel plate is improved, and the scale on the surface of the steel plate produced by the differential temperature rolling method is uniform and continuous and is not easy to peel.
(5) The mechanical properties of the surface layer and the core part meet the requirements of technical standards, the abundance is reasonable, and the process performance is good.
Drawings
FIG. 1 is a central defect evaluation (central porosity 0.5 grade) of a high-quality carbon structural steel super-thick steel plate with the thickness of 118mm rolled at different temperatures;
FIG. 2 is a central defect evaluation (center segregation level 1.0) of a high quality carbon structural steel extra thick steel plate of 118mm thickness obtained by ordinary rolling.
Detailed Description
In order to better explain the technical solution of the present invention, the technical solution of the present invention is further described below with reference to specific examples, which are only exemplary to illustrate the technical solution of the present invention and do not limit the present invention in any way.
The following table 1 is a list of values of main process parameters of each of examples 1 to 6 of the present invention, and examples 1 to 6 were rolled using a casting slab having a thickness of 250 mm.
The following table 2 is a list of values of main process parameters of each of examples 7 to 12 of the present invention, and examples 7 to 12 were rolled using a casting slab having a thickness of 300 mm.
Table 3 below is a table of the main performance parameters of the finished steel sheets produced in examples 1 to 12 of the present invention.
The production method for rolling the high-quality carbon structural steel with the thickness of more than or equal to 60mm by using the wide and thick plate finishing mill in each embodiment of the invention comprises the processes of casting blank heating, rough rolling, forced cooling and finish rolling, and particularly comprises the following steps:
(1) the casting blank is heated to 1250 +/-30 ℃ and the soaking time is more than or equal to 30 min;
(2) the rough rolling is to perform rough rolling on the heated casting blank to prepare an intermediate blank according to the thickness of the casting blank and the thickness of a finished product to be rolled, and the rolling requirement of the intermediate blank is as follows:
a. when the thickness of the finished product is more than or equal to 60-80 mm, the thickness of the intermediate blank is 1.5-2.0 times of the thickness of the finished product, and the temperature of the intermediate blank after rough rolling is 1050-1100 ℃;
b. when the thickness of the finished product is more than or equal to 80-120 mm, the thickness of the intermediate blank is 1.3-1.6 times of the thickness of the finished product, and the temperature of the intermediate blank after rough rolling is 1080-1130 ℃;
c. when the thickness of the finished product is more than or equal to 120-180 mm, the thickness of the intermediate blank is 1.1-1.4 times of the thickness of the finished product, and the temperature of the intermediate blank after rough rolling is 1100-1150 ℃;
(3) the forced cooling is to cool the intermediate billet by high-pressure water by utilizing high-pressure descaling water of a wide and thick plate four-roller reversible finishing mill, and specifically comprises the following steps:
a. when the thickness of the finished product is more than or equal to 60-80 mm, spraying high-pressure descaling water for 3 times to the intermediate blank, wherein the water spraying amount is 320-380 m each time3Controlling the temperature of the intermediate blank sprayed with water each time to be 80-90 ℃ until the surface temperature of the intermediate blank is reduced to 780-860 ℃;
b. when the thickness of the finished product is more than or equal to 80-120 mm, spraying high-pressure descaling water for 4 times, wherein the water spraying amount is 280-360 m each time3Controlling the temperature of the intermediate blank sprayed with water each time to be 70-80 ℃ until the surface temperature of the intermediate blank is reduced to 760-850 ℃;
c. when the thickness of the finished product is more than or equal to 120-180 mm, spraying high-pressure descaling water for 5 times to the intermediate blank, wherein the thickness is 240-300 m3Controlling each sprayingCooling the intermediate blank with water to 60-70 ℃ until the surface temperature of the intermediate blank is reduced to 750-850 ℃;
(4) the finish rolling is that after high-pressure water cooling of the intermediate blank is completed, the surface temperature of the intermediate blank is rapidly cooled to 750-860 ℃ from 1050-1150 ℃, the core temperature of the intermediate blank is basically unchanged, the surface temperature and the core temperature of the intermediate blank have 240-350 ℃, and then the intermediate blank rapidly enters the finish rolling stage for rolling, and specifically:
a. when the thickness of the finished product is more than or equal to 60-80 mm, the first-pass rolling reduction of finish rolling is more than or equal to 25 mm; then, the surface of the rolled piece returns to the temperature, the core temperature is reduced to 990-1040 ℃, and then forming pass rolling is completed;
b. when the thickness of the finished product is more than or equal to 80-120 mm, the first-pass rolling reduction of finish rolling is more than or equal to 23 mm; then, the surface of the rolled piece is returned to the temperature, the core temperature is reduced to 1030-1080 ℃, and then forming pass rolling is completed;
c. when the thickness of the finished product is more than or equal to 120-180 mm, the first-pass rolling reduction of finish rolling is more than or equal to 20 mm; and then, the surface of the rolled piece returns to the temperature, the core temperature is reduced to 1050-1100 ℃, and then the forming pass rolling is completed.
TABLE 1 list of values of the main process parameters of each of examples 1 to 6 when the thickness of the cast slab is 250mm
Figure 681271DEST_PATH_IMAGE001
TABLE 2 List of values of the main process parameters of examples 7 to 12 when the thickness of the cast slab was 300mm
Figure 129570DEST_PATH_IMAGE002
TABLE 3 indexes of main Properties of Steel sheets obtained in examples 1 to 12
Figure 581411DEST_PATH_IMAGE003
As can be seen from Table 3, the super-thick steel sheets obtained in examples 1 to 12 were tested for mechanical properties of the surface layer and the core portion, i.e., yield strength, tensile strength and elongation, in addition to the cold bending properties. The cold bending performance of all the examples is qualified, which shows that the surface quality of the extra-thick plate of the example is excellent and the technological performance is good. The mechanical properties of the surface layer and the core part meet the requirements of technical standards, and the abundance is reasonable. Particularly, the mechanical property of the core part is evaluated according to the qualified index of the mechanical property required by the technical standard of the special sampling part of the extra-thick plate, and the mechanical property of the core part also meets the standard requirement, so that the mechanical property of the prepared steel plate meets the requirement of the technical standard after the differential temperature rolling by adopting the method disclosed by the invention, and the prepared steel plate has reasonable margin and good process performance.
Comparative example 1
In the embodiment, a common rolling process is adopted to roll the high-quality carbon structural steel super-thick steel plate with the thickness of 118 mm.
By means of YB/T4003 & lt microscopic evaluation method for sulfur mark of defect and non-metallic inclusion of continuous casting billet & gt, the center defects of the 118mm thick high-quality carbon structural steel super-thick steel plate rolled by the differential temperature rolling process of the embodiment 4 of the invention and the 118mm thick high-quality carbon structural steel super-thick steel plate rolled by the common rolling process of the comparative example 1 are evaluated, and the center defects are respectively shown in the figure 1 and the figure 2. The central defect of the differential temperature rolling super-thick steel plate is the central loose grade of 0.5, while the central defect of the common rolling super-thick steel plate is the central segregation grade of C1.0. For the super-thick steel plate, the center segregation is the root cause of the layering phenomenon during the secondary processing of the user, and therefore, the differential temperature rolling is beneficial to improving the internal quality, and the common layering phenomenon in the production process of the super-thick steel plate of the high-quality carbon structural steel is avoided, thereby also explaining the creativity of the invention.

Claims (1)

1. A production method for rolling high-quality carbon structural steel with the thickness of more than or equal to 60mm by using a wide and thick plate finishing mill at different temperatures comprises the processes of casting blank heating, rough rolling, forced cooling and finish rolling, and is characterized in that:
(1) the casting blank is heated to 1250 +/-30 ℃ and the soaking time is more than or equal to 30 min;
(2) the rough rolling is to perform rough rolling on the heated casting blank to prepare an intermediate blank according to the thickness of the casting blank and the thickness of a finished product to be rolled, and the rolling requirement of the intermediate blank is as follows:
a. when the thickness of the finished product is 60-80 mm, the thickness of the intermediate blank is 1.5-2.0 times of the thickness of the finished product, and the temperature of the intermediate blank after rough rolling is 1050-1100 ℃;
b. when the thickness of the finished product is more than 80 and less than 120mm, the thickness of the intermediate blank is 1.3-1.6 times of that of the finished product, and the temperature of the intermediate blank after rough rolling is 1080-1130 ℃;
c. when the thickness of the finished product is 120-180 mm, the thickness of the intermediate blank is 1.1-1.4 times of the thickness of the finished product, and the temperature of the intermediate blank after rough rolling is 1100-1150 ℃;
(3) the forced cooling is to cool the intermediate billet by high-pressure water by utilizing high-pressure descaling water of a wide and thick plate four-roller reversible finishing mill, and specifically comprises the following steps:
a. when the thickness of the finished product is 60-80 mm, spraying high-pressure descaling water for 3 times to the intermediate blank, wherein the water spraying amount is 320-380 m each time3Controlling the temperature of the intermediate blank sprayed with water each time to be 80-90 ℃ until the surface temperature of the intermediate blank is reduced to 780-860 ℃;
b. when the thickness of the finished product is more than 80 and less than 120mm, spraying high-pressure descaling water for 4 times to the intermediate blank, wherein the water spraying amount is 280-360 m each time3Controlling the temperature of the intermediate blank sprayed with water each time to be 70-80 ℃ until the surface temperature of the intermediate blank is reduced to 760-850 ℃;
c. when the thickness of the finished product is 120-180 mm, spraying high-pressure descaling water for 5 times to the intermediate blank, wherein the water spraying amount is 240-300 m each time3Controlling the temperature of the intermediate blank sprayed with water each time to be 60-70 ℃ until the surface temperature of the intermediate blank is reduced to 750-850 ℃;
(4) the finish rolling is that after high-pressure water cooling of the intermediate blank is completed, the surface temperature of the intermediate blank is rapidly cooled to 750-860 ℃ from 1050-1150 ℃, the core temperature of the intermediate blank is basically unchanged, the surface temperature and the core temperature of the intermediate blank have 240-350 ℃, and then the intermediate blank rapidly enters the finish rolling stage for rolling, and specifically:
a. when the thickness of the finished product is 60-80 mm, the first-pass rolling reduction of finish rolling is more than or equal to 25 mm; then, the surface of the rolled piece returns to the temperature, the core temperature is reduced to 990-1040 ℃, and then forming pass rolling is completed;
b. when the thickness of the finished product is more than 80 and less than 120mm, the first-pass rolling reduction of finish rolling is more than or equal to 23 mm; then, the surface of the rolled piece is returned to the temperature, the core temperature is reduced to 1030-1080 ℃, and then forming pass rolling is completed;
c. when the thickness of the finished product is 120-180 mm, the first-pass rolling reduction of finish rolling is more than or equal to 20 mm; and then, the surface of the rolled piece returns to the temperature, the core temperature is reduced to 1050-1100 ℃, and then the forming pass rolling is completed.
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