CN114150146B - Special steel heating furnace mixed heating method based on steel temperature - Google Patents
Special steel heating furnace mixed heating method based on steel temperature Download PDFInfo
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- CN114150146B CN114150146B CN202111482637.5A CN202111482637A CN114150146B CN 114150146 B CN114150146 B CN 114150146B CN 202111482637 A CN202111482637 A CN 202111482637A CN 114150146 B CN114150146 B CN 114150146B
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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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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to a special steel heating furnace mixed heating method based on steel temperature, and belongs to the technical field of steel heating. The method comprises the following steps: (1) According to the composition of the billet components, obtaining an optimal heating interval of the billet at the forefront end in the advancing direction in each heating section; (2) According to the optimal heating interval obtained in the step (1), adjusting to obtain an actual heating interval; (3) Obtaining a mixed target heating temperature interval of each heating section in the heating furnace according to a steel grade heating procedure; (4) And comparing the real-time temperature value Ts of the billet with an actual heating interval, and performing corresponding strategy control on the temperature of the heating furnace according to a comparison result. The invention solves the difficult problem of setting the furnace temperature under the requirements of various heating processes when the billets are mixed, reduces the labor intensity of operators and improves the heating quality of special steel billets.
Description
Technical Field
The invention belongs to the technical field of steel heating, and particularly relates to a special steel heating furnace mixed heating method based on steel temperature.
Background
The special steel is widely applied to the field with higher requirements on steel quality, more alloy elements are added in the smelting process, and special production and processing processes are adopted, so that the heating process of the steel billet before rolling production has strict and higher requirements.
The heating furnace is generally divided into a preheating section, a plurality of heating sections and a soaking section according to the requirements of a heating process, and the special steel heating process has strict requirements on heating time length and heating temperature system for each heating section, and if the heating process can not strictly meet the process requirements, the special steel heating process has direct influence on the quality of special steel products. Therefore, special steel factories pay great attention to the heating quality of special steel.
At present, although a process control system is arranged in a heating furnace of most domestic special steel plants, because the special steel products are large in steel types and small in order yield, the situation that a plurality of steel types cannot be mixed and heated is often avoided in the heating furnace, the heating process control system cannot accurately and automatically control the heating time and the heating temperature of each section of steel billet in the heating furnace according to a heating process rule, in actual production, the heating time and the heating temperature are manually controlled by operators in comparison with the heating rule, so that the labor intensity of operators is increased, and the heating quality cannot be completely guaranteed.
Disclosure of Invention
Aiming at the problem that the heating temperature of each heating section in a heating furnace cannot be accurately controlled due to different heating technologies of different billets when the billets are mixed and heated in the prior art, the invention provides a special steel heating furnace mixed and heated method based on steel temperature, so as to solve the problems.
Firstly, according to a steel grade heating plan and a heating regulation, a mixed steel billet heating target temperature plan of each heating section in a heating furnace is obtained; according to the target heating temperature programming of each section in the furnace, taking the upper limit and the lower limit of the programmed heating temperature of each section as the upper limit and the lower limit of the furnace temperature optimization, automatically calculating an optimal billet heating interval, and carrying out iterative furnace temperature setting calculation; setting a multi-gear heating target in a mixed heating planning temperature range according to manual requirements in the heating process; and carrying out periodic iterative setting calculation on the furnace temperature of the mixed steel billet according to the special steel mixed heating planning temperature.
The technical scheme of the invention is as follows:
a special steel heating furnace mixed heating method based on steel temperature comprises the following steps:
(1) According to the composition of the billet components, obtaining an optimal heating interval of the billet at the forefront end in the advancing direction in each heating section;
(2) According to the optimal heating interval obtained in the step (1), adjusting to obtain an actual heating interval;
(3) Obtaining a mixed target heating temperature interval of each heating section in the heating furnace according to a steel grade heating procedure;
(4) And comparing the real-time temperature value Ts of the billet with an actual heating interval, and performing corresponding strategy control on the temperature of the heating furnace according to a comparison result.
The steel billet is carried out again according to the steps (1) - (4) after every change of the position in the heating furnace.
The billet advances in the heating furnace in a conveying manner, and the real-time temperature value Ts of the billet in the heating furnace is the calculated real-time temperature of the billet at the forefront end of the advancing direction in each heating section. The calculation method of the real-time temperature value Ts is calculated according to the corresponding relation between the furnace temperatures of different heating sections and the steel billet, and is a conventional technical means in the field.
The optimal heating interval in the step (1) is calculated by the composition of steel billet components, and the method is a conventional technical means in the field.
The step (2) is specifically to increase the upper limit of the optimal heating interval by 20 ℃ and decrease the lower limit of the optimal heating interval by 20 ℃ to obtain an actual heating interval.
The step (3) is specifically to take intersection of the heating procedure temperature ranges of adjacent steel grades in the same heating section as a mixed target heating temperature interval; if the intersection is empty, the positions of 1-2 billets are empty between the steel billets without the intersection. And (3) calculating the mixed heating target temperature of each heating section again according to the method after each change of the position of the steel billet in the heating furnace to obtain a new mixed heating target temperature, and obtaining the heating ranges of the steel billets of different steel grades.
The step (4) specifically comprises the following steps:
a. equally dividing the actual heating section of one of the heating sections obtained in the step (2) into m temperature steps: t'. 1 -T’ m The method comprises the steps of carrying out a first treatment on the surface of the Meanwhile, equally dividing the mixed target heating temperature interval of the corresponding heating section in the step (3) into n temperature steps: t (T) 1 -Tn，n＝m；
b. Calculating to obtain real-time temperature value Ts of billet in the heating section, comparing Ts with m temperature files in step a, and finding out the nearest temperature file T' i The method comprises the steps of carrying out a first treatment on the surface of the The i is any integer from 1 to m;
c. controlling the heating temperature of the heating section to be in a temperature range T n-(i-1) ；
d. Repeating the steps a-c, and controlling the heating temperature of other heating sections in the heating furnace.
Preferably, m is 3, 4 or 5.
The beneficial effects of the invention are as follows:
the invention aims at the condition of heating and mixing special steel billets, adopts a method for setting the furnace temperature by taking the temperature of the steel billets as a calculation target, and actually obtains the heating set temperature of the mixed steel billets through dividing the temperature range of the optimal temperature rising section of the steel grades and the temperature of the steel billets in the furnace. The invention solves the difficult problem of setting the furnace temperature under the requirements of various heating processes when the billets are mixed, reduces the labor intensity of operators and improves the heating quality of special steel billets.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of the heating of a billet in a heating furnace according to example 1 of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
A special steel heating furnace mixed heating method based on steel temperature comprises the following steps:
the heating section in the heating furnace of a special steel plant is divided into a preheating section, a heating section I, a heating section II and a soaking section, and the real-time distribution of billets in each heating section is shown in figure 1. The temperature of each heating section is the upper limit and the lower limit of the temperature of the preheating section, the upper limit and the lower limit of the temperature of the heating section I, the upper limit and the lower limit of the temperature of the soaking section and the upper limit and the lower limit of the target tapping temperature; the produced steel grades are A, B, C, D and E; the heating temperature protocol for each heating section of each steel grade is shown in table 1. The heating temperature schedule of each steel grade in the heating section in table 1 is a means conventional in the art and is obtained by analyzing the composition of the steel grade and the location in the heating furnace.
TABLE 1 Special Steel heating temperature protocol (Unit:. Degree.C.)
The preheating section is the intersection of the heating protocols of steel grades E, A and D:
{955,995}∩{960,1000}∩{945,985}＝{960,985}；
heating I section is the intersection of heating regulations of steel grades D and C:
{945,985}∩{940,980}＝{945,980}；
heating section II is the intersection of the heating protocols of steel grades C and B:
{1180,1220}∩{1190,1230}＝{1190,1220}；
heating schedule intersection of soaking section steel grades B and a:
{1170,1210}∩{1180,1220}＝{1180,1210}；
the target heating temperature interval of the mixed loading of each heating section in the heating furnace is as follows:
preheating section: {960,985};
heating section I: {945,980};
heating section II: {1190,1220};
and (3) a soaking section: {1180,1210}.
According to the special steel grade heating regulation and the actual calculation of the furnace condition, the optimal heating interval of the steel grade A, B, C, D, E is obtained, the upper limit of the optimal heating interval is increased by 20 ℃ and the lower limit of the optimal heating interval is reduced by 20 ℃ due to the process requirement, and thus the actual heating interval is obtained.
Taking heating II section furnace temperature control as an example, obtaining the real-time steel temperature T of the heating II section billet B1 through model calculation S ＝1172℃；
The actual heating interval of the billet B in the heating section II is {1170, 1210 };
dividing the heating target temperature regulation {1190,1220} of the heating II-stage mixed furnace temperature into 4 temperature steps T 1 ：{1190,1197.5}，T 2 ：{1197.5,1205}，T 3 ：{1205,1212.5}，T 4 ：{1212.5,1220}；
The actual heating interval {1170, 1210} ℃of the billet B is correspondingly and uniformly divided into 4 grades, T' 1 ：{1170,1180}，T’ 2 ：{1180,1190}，T′ 3 ：{1190,1200}，T′ 4 ：{1200,1210}；
Will T S Comparison of =1172deg.C with T', T S Belonging to T' 1 Gear according to T' i Corresponding T n-(i-1) (n=4), the furnace temperature of the heating furnace is controlled to be T 4 : {1212.5-1220 }. When the billet moves forwards and the billet C moves to the forefront end of the heating II section, the heating temperature of the heating II section is calculated again according to the billet C as a standard.
The temperature setting of the mixed loading furnace of other heating sections is calculated by analogy.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. The special steel heating furnace mixed heating method based on the steel temperature is characterized by comprising the following steps of:
(1) According to the composition of the billet components, obtaining an optimal heating interval of the billet at the forefront end in the advancing direction in each heating section;
(2) Raising the upper limit of the optimal heating interval by 20 ℃ and lowering the lower limit of the optimal heating interval by 20 ℃ to obtain an actual heating interval;
(3) Taking intersection of the heating regulation temperature ranges of adjacent steel grades in the same heating section as a mixed target heating temperature section to obtain a mixed target heating temperature section of each heating section of the heating furnace, and if the intersection is empty, leaving 1-2 blank positions between the steel grade blanks without intersection;
(4) Comparing a real-time steel billet temperature value Ts with an actual heating interval, wherein the real-time steel billet temperature value Ts is calculated as the real-time temperature of the steel billet at the forefront end of the advancing direction in each heating section, and carrying out corresponding strategy control on the temperature of the heating furnace according to a comparison result; the method comprises the following specific steps:
a. equally dividing the actual heating section of one of the heating sections obtained in the step (2) into m temperature steps: t'. 1 -T’ m The method comprises the steps of carrying out a first treatment on the surface of the Meanwhile, equally dividing the mixed target heating temperature interval of the corresponding heating section in the step (3) into n temperature steps: t (T) 1 -Tn，n=m；
b. Calculating to obtain real-time temperature value Ts of billet in the heating section, comparing Ts with m temperature files in step a, and finding out the nearest temperature file T' i The method comprises the steps of carrying out a first treatment on the surface of the The i is any integer from 1 to m;
c. controlling the heating temperature of the heating section to be in a temperature range T n-(i-1) ；
d. Repeating the steps a-c, and controlling the heating temperature of other heating sections in the heating furnace.
2. The method for heating a steel temperature-based special steel heating furnace mixed package according to claim 1, wherein m in the step (4) is 3, 4 or 5.
3. The method of heating a steel-based special steel heating furnace according to claim 1, wherein the temperature of the heating furnace is determined again according to steps (1) to (4) each time the position of the billet in the heating furnace is changed.
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| CN106636606B (en) * | 2016-12-30 | 2018-10-12 | 北京和隆软件有限公司 | A kind of method for controlling furnace temperature of heating furnace based on simulation model |
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