CN114150146A - Special steel heating furnace mixed loading heating method based on steel temperature - Google Patents
Special steel heating furnace mixed loading heating method based on steel temperature Download PDFInfo
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- CN114150146A CN114150146A CN202111482637.5A CN202111482637A CN114150146A CN 114150146 A CN114150146 A CN 114150146A CN 202111482637 A CN202111482637 A CN 202111482637A CN 114150146 A CN114150146 A CN 114150146A
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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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Abstract
The invention relates to a special steel heating furnace mixed loading 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 components of the steel billet, obtaining the optimal heating interval of the steel billet at the forefront end of the advancing direction in each heating section; (2) adjusting to obtain an actual heating interval according to the optimal heating interval obtained in the step (1); (3) obtaining a mixed loading target heating temperature interval of each heating section in the heating furnace according to the steel type heating regulation; (4) and comparing the real-time temperature value Ts of the steel billet with the actual heating interval, and performing corresponding strategy control on the temperature of the heating furnace according to the comparison result. The invention solves the difficult problem of furnace temperature setting under various heating process requirements when the steel 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 loading heating method based on steel temperature.
Background
The special steel is widely applied to the field with higher requirements on the quality of steel, more alloy elements are added in the smelting process, and special production and processing processes are adopted, so that strict and higher requirements on the heating process of the billet are met before rolling production.
The heating furnace is generally divided into a preheating section, a plurality of heating sections and a soaking section according to the requirements of the heating process, the special steel heating process has strict requirements on the heating time length and the heating temperature schedule of each heating section, and if the heating process cannot strictly meet the process requirements, the quality of special steel products can be directly influenced. Therefore, the special steel factories pay great attention to the heating quality of the special steel.
Although most domestic special steel plant heating furnaces have process control systems at present, because special steel products have multiple steel types and small order output, the condition that multiple steel types are mixed and heated cannot be avoided in the heating furnaces, the heating process control system cannot accurately and automatically control the heating time and the heating temperature of each section of a steel billet in the heating furnaces according to heating process rules, the heating time and the heating temperature are all manually controlled by operators according to the heating rules in actual production, the labor intensity of the operators is increased, and the heating quality cannot be completely guaranteed.
Disclosure of Invention
The invention provides a special steel heating furnace mixed-loading heating method based on steel temperature, aiming at solving the problem that the heating temperature of each heating section in a heating furnace can not be accurately controlled due to different heating processes of different steel billets when the steel billets are mixed-loading and heated in the prior art.
Firstly, obtaining a mixed loading billet heating target temperature plan of each heating section in a heating furnace according to a steel grade heating plan and a heating rule; according to the target heating temperature plan of each section in the furnace, taking the upper and lower limits of the planned heating temperature of each section as the upper and lower limits of furnace temperature optimization, automatically calculating the optimal billet heating interval, and performing iterative furnace temperature setting calculation; setting a multi-grade heating target in a mixed loading heating planned temperature range according to manual needs in the heating process; and carrying out cycle iterative setting calculation on the temperature of the mixed steel billet furnace according to the special steel mixed heating planned temperature.
The technical scheme of the invention is as follows:
a special steel heating furnace mixed loading heating method based on steel temperature comprises the following steps:
(1) according to the composition of the components of the steel billet, obtaining the optimal heating interval of the steel billet at the forefront end of the advancing direction in each heating section;
(2) adjusting to obtain an actual heating interval according to the optimal heating interval obtained in the step (1);
(3) obtaining a mixed loading target heating temperature interval of each heating section in the heating furnace according to the steel type heating regulation;
(4) and comparing the real-time temperature value Ts of the steel billet with the actual heating interval, and performing corresponding strategy control on the temperature of the heating furnace according to the comparison result.
And (4) carrying out the steps (1) to (4) again every time the position of the steel billet in the heating furnace is changed.
The billet advances in the heating furnace in a conveying mode, and the real-time billet temperature value Ts in the heating furnace is the real-time temperature of the billet at the forefront of the advancing direction in each heating section. The real-time temperature value Ts is calculated according to the corresponding relationship between the furnace temperatures of different heating sections and the steel billets, and the method is a conventional technical means in the field.
The optimal heating interval in the step (1) is calculated by steel billet component composition, and the method is a conventional technical means in the field.
And (2) specifically, increasing the upper limit of the optimal heating interval by 20 ℃, and reducing the lower limit of the optimal heating interval by 20 ℃ to obtain an actual heating interval.
The step (3) is to take the intersection of the heating rule temperature ranges of adjacent steel grades in the same heating section as a mixed loading target heating temperature interval; if the intersection is empty, the steel billets of the non-intersection steel type are empty at the positions of 1-2 steel billets. And recalculating the mixed heating target temperature of each heating section according to the method every time the position of the steel billet in the heating furnace changes once to obtain a new mixed heating target temperature and obtain the heating ranges of the steel billets of different steel types.
The step (4) is specifically as follows:
a. dividing the actual heating interval of one heating section obtained in the step (2) into m temperature grades: t'1-T’m(ii) a And (4) dividing the mixed target heating temperature interval of the corresponding heating section in the step (3) into n temperature levels: t is1-Tn，n＝m；
b. Obtaining a real-time temperature value Ts of the steel billet in the heating section through calculation, comparing the Ts with the m temperature gears in the step a, and finding out the closest temperature gear T'i(ii) a I is an integer of 1 to m;
c. controlling the heating temperature of the heating section to be in a temperature range Tn-(i-1)；
d. And (c) 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 invention has the beneficial effects that:
the invention relates to a method for setting furnace temperature by taking billet temperature as a calculation target, which is adopted under the condition of heating and mixing special steel billets. The invention solves the difficult problem of furnace temperature setting under various heating process requirements when the steel 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 or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic view showing heating of a billet in a heating furnace according to example 1 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A special steel heating furnace mixed loading heating method based on steel temperature comprises the following steps:
the heating section in the heating furnace of a special steel mill is divided into a preheating section, a heating I section, a heating II section and a soaking section, and the real-time distribution of steel billets in each heating section is shown in figure 1. The temperature of each heating section is the upper and lower limits of the temperature of the preheating section, the upper and lower limits of the temperature of the heating section I, the upper and lower limits of the temperature of the soaking section and the upper and lower limits of the target tapping temperature; the steel grades produced were A, B, C, D and E; the heating temperature schedule for each heating section for each steel type is shown in table 1. The heating temperature schedule in the heating section for each steel type in table 1 is a routine technical means in the art and can be obtained by analyzing the composition of the steel type and the position in the heating furnace.
TABLE 1 Special Steel heating temperature protocol (Unit:. degree. C.)
The preheating section is the intersection of the heating rules of steel grades E, A and D:
{955,995}∩{960,1000}∩{945,985}＝{960,985}；
the heating I section is the intersection of the heating rules of steel grades D and C:
{945,985}∩{940,980}＝{945,980}；
the heating section II is the intersection of the heating regulations of the steel grades C and B:
{1180,1220}∩{1190,1230}＝{1190,1220}；
intersection of heating rules of soaking section steel types B and A:
{1170,1210}∩{1180,1220}＝{1180,1210}；
the mixed target heating temperature interval of each heating section in the heating furnace is as follows:
a preheating section: {960,985 };
heating the I section: {945,980 };
heating in a second stage: {1190,1220 };
a soaking section: {1180,1210}.
And (3) calculating to obtain an optimal heating interval of the steel grade A, B, C, D, E according to the special steel grade heating regulation and the actual furnace condition, wherein the upper limit of the optimal heating interval is increased by 20 ℃ and the lower limit of the optimal heating interval is decreased by 20 ℃ according to the process requirements, so that the actual heating interval is obtained.
Taking furnace temperature control of the heating section II as an example, the real-time steel temperature T of the heating section II billet B1 is obtained through model calculationS＝1172℃；
The actual heating interval of the steel blank B in the heating section II is {1170, 1210 };
dividing a heating target temperature schedule {1190,1220} of the heating II-stage mixing furnace into 4 temperature levels, T1：{1190,1197.5}，T2：{1197.5,1205}，T3：{1205,1212.5}，T4：{1212.5,1220}；
Uniformly dividing the actual heating section {1170, 1210} DEG C of the billet B into 4 grades, T'1：{1170,1180}，T’2：{1180,1190}，T′3：{1190,1200}，T′4：{1200,1210}；
Will TSComparison with T' at 1172 ℃ TSBelongs to T'1Grade, according to T'iCorresponds to Tn-(i-1)(n is 4), the furnace temperature is controlled to be T4: {1212.5-1220 }. When the steel billet moves forwards and the steel billet C moves to the foremost end of the second heating section, the furnace temperature of the second heating section is set and calculated again according to the steel billet C as a standard.
The temperature setting of the mixed loading furnace of other heating sections is calculated by analogy with the method.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A special steel heating furnace mixed loading heating method based on steel temperature is characterized by comprising the following steps:
(1) according to the composition of the components of the steel billet, obtaining the optimal heating interval of the steel billet at the forefront end of the advancing direction in each heating section;
(2) adjusting to obtain an actual heating interval according to the optimal heating interval obtained in the step (1);
(3) obtaining a mixed loading target heating temperature interval of each heating section in the heating furnace according to the steel type heating regulation;
(4) and comparing the real-time temperature value Ts of the steel billet with the actual heating interval, and performing corresponding strategy control on the temperature of the heating furnace according to the comparison result.
2. The hybrid heating method of an extra steel heating furnace based on steel temperature according to claim 1, wherein the real-time temperature value Ts of the slab in the heating furnace is calculated as the real-time temperature of the slab at the forefront in the advancing direction in each heating zone.
3. The special steel heating furnace mixed loading heating method based on the steel temperature as claimed in claim 1, characterized in that the step (2) is specifically to raise the upper limit of the optimal heating interval by 20 ℃, and lower the lower limit of the optimal heating interval by 20 ℃ to obtain the actual heating interval.
4. The special steel heating furnace mixed loading heating method based on steel temperature as claimed in claim 1, characterized in that the step (3) is to take the intersection of the heating regulation temperature ranges of adjacent steel types in the same heating section as the mixed loading target heating temperature interval.
5. The special steel heating furnace mixed loading heating method based on the steel temperature of claim 4, wherein if the intersection is empty, the positions of 1-2 blanks are empty between blanks of steel types without the intersection.
6. The special steel heating furnace mixed loading heating method based on the steel temperature as claimed in claim 1, characterized in that the step (4) is specifically:
a. dividing the actual heating interval of one heating section obtained in the step (2) into m temperature grades: t'1-T’m(ii) a And (4) dividing the mixed target heating temperature interval of the corresponding heating section in the step (3) into n temperature levels: t is1-Tn，n＝m；
b. Obtaining a real-time temperature value Ts of the steel billet in the heating section through calculation, comparing the Ts with the m temperature gears in the step a, and finding out the closest temperature gear T'i(ii) a I is an integer of 1 to m;
c. controlling the heating temperature of the heating section to be in a temperature range Tn-(i-1)；
d. And (c) repeating the steps a-c, and controlling the heating temperature of other heating sections in the heating furnace.
7. The mixed loading heating method of the special steel heating furnace based on the steel temperature as claimed in claim 6, wherein m is 3, 4 or 5.
8. The mixed charging heating method of special steel heating furnace based on steel temperature according to claim 1, characterized in that the furnace temperature is determined again according to the steps (1) - (4) every time the position of the steel billet in the heating furnace changes.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004084030A (en) * | 2002-08-28 | 2004-03-18 | Jfe Steel Kk | Layout of heating furnace in hot-rolling facility and operating method |
| CN106636606A (en) * | 2016-12-30 | 2017-05-10 | 北京和隆软件有限公司 | Heating furnace temperature control method based on simulation model |
| CN106906352A (en) * | 2017-03-30 | 2017-06-30 | 重庆赛迪热工环保工程技术有限公司 | A kind of heating means when heater for rolling steel steel billet is loaded in mixture |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004084030A (en) * | 2002-08-28 | 2004-03-18 | Jfe Steel Kk | Layout of heating furnace in hot-rolling facility and operating method |
| CN106636606A (en) * | 2016-12-30 | 2017-05-10 | 北京和隆软件有限公司 | Heating furnace temperature control method based on simulation model |
| CN106906352A (en) * | 2017-03-30 | 2017-06-30 | 重庆赛迪热工环保工程技术有限公司 | A kind of heating means when heater for rolling steel steel billet is loaded in mixture |
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