CN111254259A - Efficient tempering production method for thin tempering plate - Google Patents
Efficient tempering production method for thin tempering plate Download PDFInfo
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- CN111254259A CN111254259A CN202010236265.7A CN202010236265A CN111254259A CN 111254259 A CN111254259 A CN 111254259A CN 202010236265 A CN202010236265 A CN 202010236265A CN 111254259 A CN111254259 A CN 111254259A
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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Abstract
The invention relates to a high-efficiency tempering production method for a thin tempering plate, which comprises the following specific steps of selecting a group of tempering thin plates with straightness less than or equal to 12mm/m and without edge waves and the same specification and process; before entering a furnace, aligning and stacking the head and the tail of the selected tempered thin plate, and aligning and combining two sides of the stacked tempered thin plate through a centering device; taking the overlapped plates as a whole piece of steel, and respectively setting the heating coefficient, the in-furnace time and the heat preservation time of the steel, wherein the heating coefficient is set according to the thickness of the overlapped plates; after the parameters are set, the stacked plates are sent into a heat treatment furnace for tempering, and a certain safety interval is kept between two stacked plates which are sequentially fed into the furnace. The invention has the advantages that a plurality of thin tempering plates with the same specification and the same process are put into a furnace together for tempering, the thickness of the whole steel plate is increased, the safety interval of tempering the steel plate is shortened, and the tempering production efficiency of the thin steel plate in unit time is improved.
Description
Technical Field
The invention relates to the technical field of tempering processes for thin steel plates, in particular to an efficient tempering production method for thin tempering plates.
Background
The production efficiency of the tempered steel plate with the same thickness and the same process on a roller hearth furnace depends on the in-furnace time of the steel plate and the safe distance between the steel plates. The steel plate tempering in-furnace time setting principle is that in-furnace time = heating coefficient and steel plate thickness + heat preservation time, wherein the heating coefficient depends on the steel type characteristics and specifications, the heat preservation time mainly depends on the steel type characteristics and thickness, the heat preservation time difference of the same steel type is not in a straight line relation, and sometimes the thickness is doubled but the heat preservation time is not changed. Particularly for thin steel plates, the change of the heat preservation time is small, and sometimes the heat preservation time can be kept unchanged, so that the thicker the steel plate is, the higher the heat treatment efficiency in unit time is; conversely, the thinner the steel sheet, the less heat treatment efficiency per unit time.
Meanwhile, in the continuous production process of the roller-hearth heat treatment furnace, in order to avoid deformation and damage of heat treatment furnace equipment caused by collision between steel plates in the heating process, a safety interval of 0.8-1.8 m is generally set in the heating and heat preservation processes of the steel plates, and the thinner the steel plate is, the closer the safety interval of the steel plate is to the upper limit of the safety interval. If the conventional production method is adopted to continuously produce the tempering plates in the roller hearth type heat treatment furnace, the thicker the steel plate is, the larger the heat treatment yield in unit time is; the thinner the steel sheet, the relatively smaller the heat treatment yield per unit time. Therefore, the heat treatment efficiency per unit time of the thin gauge steel plate is low, affecting the production schedule and the cost.
Disclosure of Invention
The invention aims to solve the problems of long furnace time, large safety distance and low tempering efficiency of the existing thin steel plate, and provides an efficient tempering production method for the thin tempering plate.
In order to achieve the purpose, the invention adopts the following technical scheme:
an efficient tempering production method for thin-specification tempered plates comprises the following specific steps:
(1) pre-selecting a plate: selecting a group of tempered thin plates with the same specification and process, wherein the straightness of each tempered thin plate is less than or equal to 12mm/m and no edge waves exist;
(2) plate stacking: before entering a furnace, aligning and stacking the head and the tail of the selected tempered thin plates, wherein the number of the plate stacking blocks is based on the condition that the heat preservation time before plate stacking is not more than the heat preservation time after plate stacking, and the temperature points of the plate stacking and the non-plate stacking are kept consistent;
(3) aligning: aligning two sides of the stacked tempered thin plates through a centering device;
(4) setting technological parameters: taking the aligned laminated plates as a whole piece of steel, and respectively setting the heating coefficient, the in-furnace time and the heat preservation time of the laminated plates, wherein the heating coefficient is set according to the thickness of the laminated plates, and the in-furnace time = the heating coefficient, the number of laminated plates, the thickness of each thin plate and the heat preservation time;
(5) tempering: after the parameters are set, the stacked plates are sent into a heat treatment furnace for tempering, and a certain safe interval is kept between two stacked plates which are sequentially sent into the furnace, so that equipment damage or buckling deformation caused by steel plate collision is avoided.
Further, in the step (1), the tempered sheet is subjected to cold straightening before preselection, and the sheet stacking is carried out after the shape of the tempered sheet meets the plate selection requirement.
Further, in the step (4), the heating coefficient of the laminated plate is set to be within a range of 2.0-4.5 min/mm.
Further, in the step (2), the heat preservation time of the single tempered thin plate and the laminated plate is set to be 10-60 min.
Further, in the step (5), the safety distance between the two laminated plates is kept between 0.8 and 1.8 m.
Further, in the step (5), if the performance of the tempered laminated plate is different from that of the tempered single thin plate, the number of the laminated plates in the step (2) is reduced until the performance is not different.
According to the technical scheme, a plurality of thin tempering plates with the same specification and the same process are put into a furnace together for tempering, so that the thickness of the whole steel plate is increased, the safety interval of tempering the steel plate is shortened, and the tempering production efficiency of the thin steel plate in unit time is improved.
Drawings
FIG. 1 is a flow chart of an efficient tempering production method for thin gauge tempered sheet according to the present invention;
FIG. 2 is a graph showing the variation of the holding time of the tempering plates with different thicknesses;
FIG. 3 is a schematic diagram of the structure of the present invention for the tempering of a stack in a furnace.
Detailed Description
Example 1
In order to make the present invention more clear, the following description of the high-efficiency tempering manufacturing method for thin gauge tempered sheet according to the present invention is made with reference to the accompanying drawings, and the specific examples described herein are only for the purpose of illustrating the present invention and are not intended to limit the present invention.
Taking a Q960 steel plate with the specification of 5mm 3000mm 10000mm and a heat treatment furnace with the effective length of 90m as an example, referring to FIG. 1, the specific steps of efficiently tempering the sheet with the specification by using the method of the invention are as follows, and the method is characterized by comprising the following steps:
(1) selecting three pieces of Q960 (5 mm 3000mm 10000 mm), wherein the straightness of each piece of Q960 is less than or equal to 12mm/m and no edge wave exists, the temperature of each piece of thin plate is 600 ℃, and the heat preservation time is 30 min;
(2) before entering a furnace, aligning and stacking three Q960 heads and tails to form a Q960 laminated plate with the specification of 15mm 3000mm 10000mm, wherein the temperature of the laminated plate is 600 ℃, and the heat preservation time is 30 min;
(3) aligning two sides of a Q960 laminated plate of 15mm 3000mm 10000mm by a centering device;
(4) setting the process parameters of the laminated plate, wherein the heating coefficient is set to be 2.5 by 15mm, and the furnace time = the heating coefficient, the laminated plate block number, the thickness of each thin plate and the heat preservation time, namely the furnace time is 2.5, 3, 5+30=67.5 min;
(5) after the parameters are set, the stacked plates are sent into a heat treatment furnace for tempering, and a safe interval of 1.2m is kept between two stacked plates which are sequentially fed into the furnace.
In the tempering process, if the tempered sheet can not meet the plate stacking requirement, cold straightening is required to be carried out before preselection, and plate stacking is carried out after the shape of the plate to be cold straightened meets the plate selecting requirement; in addition, if the performance of the tempered laminated plate is different from that of the tempered single thin plate, the number of the laminated plates in the step is reduced until the performance is not different.
The principle of the invention is as follows:
1) as shown in fig. 2, the temperature holding time differences of different thicknesses in the tempering process of the thin-gauge tempering plate are not in a linear relationship, and sometimes the thickness is doubled but the temperature holding time is not changed. According to the calculation formula of the output per hour of continuous production: the unit hour yield = (furnace length: steel plate weight)/(steel plate length + steel plate safety spacing): in-furnace time), under the same heat preservation time condition, the unit hour yield of the laminated plate is higher than that of a single thin plate;
2) as shown in FIG. 3, when the steel plate is continuously tempered, equipment damage or buckling deformation caused by steel plate collision is prevented, a safety interval is reserved between the steel plates, the thinner the steel plate is, the closer the safety interval is to the upper limit of the safety interval, namely the larger the safety interval is, a plurality of steel plates are stacked, the thickness is increased, the safety interval is shortened, and the tempering production efficiency is improved.
In the present invention, the in-furnace time of the stack was 2.5 × 3 × 5+30=67.5min, and the 1h heat treatment yield was about 13.36 t; and the single steel plate has the furnace time =2.5 × 5+30=42.5min, the heat treatment yield of 1h is about 25.23t, and compared with the tempering production efficiency, the tempering production efficiency is improved by 88.89%, and the effect is obvious.
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 efficient tempering production method for the thin-specification tempering plate comprises the following specific steps, and is characterized by comprising the following steps of:
(1) pre-selecting a plate: selecting a group of tempered thin plates with flatness less than or equal to 12mm/m and without edge waves and with the same specification and process;
(2) plate stacking: before entering a furnace, aligning and stacking the selected tempered thin plates end to end, wherein the number of the plate stacking blocks is based on the condition that the heat preservation time before plate stacking is not more than the heat preservation time after plate stacking, and the temperature points of the plate stacking and the non-plate stacking are kept consistent;
(3) aligning: aligning two sides of the stacked tempered thin plates through a centering device;
(4) setting technological parameters: taking the aligned laminated plates as a whole piece of steel, and respectively setting the heating coefficient, the in-furnace time and the heat preservation time of the laminated plates, wherein the heating coefficient is set according to the thickness of the laminated plates, and the in-furnace time = the heating coefficient, the number of laminated plates, the thickness of each thin plate and the heat preservation time;
(5) tempering: after the parameters are set, the stacked plates are sent into a heat treatment furnace for tempering, and a certain safety interval is kept between two stacked plates which are sequentially fed into the furnace.
2. The high-efficiency tempering production method for thin gauge tempered sheet according to claim 1, wherein:
in the step (4), the heating coefficient of the laminated plate is set within the range of 2.0-4.5 min/mm.
3. The high-efficiency tempering production method for thin gauge tempered sheet according to claim 1 or 2, characterized in that:
in the step (2), the set range of the heat preservation time of the single tempered thin plate and the laminated plate is 10-60 min.
4. The high-efficiency tempering production method for thin gauge tempered sheet according to claim 1 or 2, characterized in that:
in the step (5), the safety distance between the two laminated plates is kept between 0.8 and 1.8 m.
5. The high-efficiency tempering production method for thin gauge tempered sheet according to claim 1 or 2, characterized in that:
in the step (1), the tempered sheet is firstly subjected to cold straightening before preselection, and the sheet stacking is carried out after the shape of the tempered sheet meets the plate selection requirement.
6. The high-efficiency tempering production method for thin gauge tempered sheet according to claim 1 or 2, characterized in that:
in the step (5), if the performance of the tempered laminated plate is different from that of the tempered single sheet, the number of the laminated plates in the step (2) is reduced until the performance is not different.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113850004A (en) * | 2021-10-08 | 2021-12-28 | 重庆赛迪热工环保工程技术有限公司 | Temperature calculation method during steel plate stacking |
| CN114196802A (en) * | 2021-11-29 | 2022-03-18 | 山东钢铁集团日照有限公司 | Heat treatment process suitable for steel plate production |
| CN115109912A (en) * | 2022-06-30 | 2022-09-27 | 张家港宏昌钢板有限公司 | Efficient heat treatment method for multilayer wear-resistant steel plate |
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| CN115109912A (en) * | 2022-06-30 | 2022-09-27 | 张家港宏昌钢板有限公司 | Efficient heat treatment method for multilayer wear-resistant steel plate |
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Application publication date: 20200609 |