CN112981070A - Method for producing oriented silicon steel without pickling after normalization - Google Patents
Method for producing oriented silicon steel without pickling after normalization Download PDFInfo
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- CN112981070A CN112981070A CN202110176053.9A CN202110176053A CN112981070A CN 112981070 A CN112981070 A CN 112981070A CN 202110176053 A CN202110176053 A CN 202110176053A CN 112981070 A CN112981070 A CN 112981070A
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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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
-
- 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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
-
- 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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
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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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
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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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a method for producing oriented silicon steel without pickling after normalization, which comprises the following production process routes: smelting → continuous casting → hot rolling → normalizing annealing → tensile straightening → shot blasting → cold rolling → decarburization annealing → nitriding → coating MgO → high temperature annealing → hot stretch leveling and coating insulating film; the method removes the iron scale on the surface of the strip steel through a physical method after the normalizing annealing, and has the advantages of high efficiency, good effect, simple operation and easy control; compared with the conventional process, the method saves the work of pickling and subsequent waste acid treatment, eliminates the pollution of acid mist to the environment, eliminates the potential defects of the oriented silicon steel strip caused by pickling, and has more stable and reliable product quality.
Description
Technical Field
The invention relates to the technical field of oriented silicon steel production, in particular to a method for producing oriented silicon steel without pickling after normalization.
Background
At present, the normalizing process in the production process of the oriented silicon steel is generally followed by acid washing to remove iron scales generated in the high-temperature heating process. In the traditional method, firstly, shot blasting treatment is carried out on a normalized steel plate to loosen iron scales, and then hydrochloric acid is adopted for pickling. Although good cleaning effect and surface quality can be obtained by pickling, many problems are caused therewith:
1) in order to ensure the cleaning effect, the used hydrochloric acid reaches a certain concentration, and the hydrochloric acid belongs to strong acid and is volatile, so that acid mist is generated to pollute the environment;
2) the length of the acid tank is usually about 50 meters, and after acid washing, a washing tank which is about 10 meters long is needed, so that the occupied area is large;
3) with the proceeding of acid washing, the iron ion content in the acid tank is continuously increased, the reaction speed of hydrochloric acid and iron scale is reduced, and the operation speed of a unit in a process system is usually fixed and unchanged, so that the acid washing is not uniform, the conditions of under-acid washing and over-acid washing are generated, and the surface quality and the internal quality of the oriented silicon steel are influenced;
4) in the pickling process, the strip steel is immersed in hydrochloric acid, and once the machine set is temporarily stopped and the like, the strip steel immersed in the hydrochloric acid is scrapped to cause loss;
5) the problems of waste acid discharge and environmental pollution are very obvious, a large amount of auxiliary equipment needs to be additionally arranged for subsequent treatment, the occupied area is large, and the production cost is increased.
Disclosure of Invention
The invention provides a method for producing oriented silicon steel without pickling after normalization, which removes iron scales on the surface of strip steel by a physical method after normalization annealing, and has the advantages of high efficiency, good effect, simple operation and easy control; compared with the conventional process, the method saves the work of pickling and subsequent waste acid treatment, eliminates the pollution of acid mist to the environment, eliminates the potential defects of the oriented silicon steel strip caused by pickling, and has more stable and reliable product quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for producing oriented silicon steel without pickling after normalization comprises the following production process routes: smelting → continuous casting → hot rolling → normalizing annealing → tensile straightening → shot blasting → cold rolling → decarburization annealing → nitriding → coating MgO → high temperature annealing → hot stretch leveling and coating insulating film; wherein:
the stretching and straightening process adopts a stretching and straightening machine to carry out mechanical dephosphorization treatment, and at least comprises 1 straightening process and 2-3 bending processes;
performing shot blasting treatment by using a shot blasting machine, and then purging the surface of the strip steel by using a shot purging device of the shot blasting machine to remove iron scale residues on the surface of the strip steel.
In the bending step, the diameter of the bending roller is
The outlet tension of the withdrawal and straightening machine is 20-25 KPa, and the elongation percentage of the strip steel is 1% -2%.
And the outlet tension of the shot blasting machine is 20-25 KPa.
Compared with the prior art, the invention has the beneficial effects that:
the conventional method that acid pickling is needed after normalizing annealing in the oriented silicon steel production process is broken through, the function of removing the iron oxide scale is realized by adopting the stretching and straightening process and the optimized shot blasting process, the pollution of acid mist generated by acid pickling to the environment is avoided while the process flow is shortened, the potential defect of the oriented silicon steel strip generated by acid pickling is avoided, and the product quality is more stable and reliable.
Detailed Description
The invention relates to a method for producing oriented silicon steel without pickling after normalization, and the production process route of the oriented silicon steel is as follows: smelting → continuous casting → hot rolling → normalizing annealing → tensile straightening → shot blasting → cold rolling → decarburization annealing → nitriding → coating MgO → high temperature annealing → hot stretch leveling and coating insulating film; wherein:
the stretching and straightening process adopts a stretching and straightening machine to carry out mechanical dephosphorization treatment, and at least comprises 1 straightening process and 2-3 bending processes;
performing shot blasting treatment by using a shot blasting machine, and then purging the surface of the strip steel by using a shot purging device of the shot blasting machine to remove iron scale residues on the surface of the strip steel.
In the bending step, the diameter of the bending roller is
The outlet tension of the withdrawal and straightening machine is 20-25 KPa, and the elongation percentage of the strip steel is 1% -2%.
And the outlet tension of the shot blasting machine is 20-25 KPa.
The working principle of the method for producing the oriented silicon steel without pickling after normalization is as follows:
(1) after strip steel is subjected to normalized annealing and discharged from a furnace for cooling, scale breaking is realized through a stretching straightener, a bending procedure is arranged in the stretching straightening procedure, and the scale breaking effect is enhanced by limiting the diameter of a bending roller: the iron substrate and the iron oxide scale coating material have great performance difference, and the iron substrate and the iron oxide scale coating material are bent repeatedly by a mechanical method; the matrix material generates certain elastic-plastic deformation after being stressed, the surface iron scale has poor plasticity and lower failure strength, and meanwhile, the iron scale has poor adhesion with the iron matrix and is cracked when the internal stress is greater than the failure strength because the iron scale cannot adapt to the change of the metal shape. When the normalizing plate passes through the bending roller, the upper surface and the lower surface are in different stress states, one surface is under the tensile action of tension, the iron scale and the interface of the iron matrix generate cracks, the other surface is under the action of compression force, the iron scale is extruded and crushed into a net shape, most of the iron scale is not attached to the matrix any more, and finally the iron scale is peeled off from the matrix in different forms;
after straightening and bending, a withdrawal straightening machine is used for mechanical dephosphorization treatment, so that the strip steel generates a certain elongation, the crushing degree of the iron scale on the surface of the strip steel is increased, and the dephosphorization speed and effect are improved.
(2) After primary dephosphorization, throwing the pills out by using an impeller which rotates at a high speed by using a shot blasting machine to impact the surface of the strip steel at a high speed, and removing residual iron oxide scales on the surface of the strip steel by using the impact and friction action of the pills; the large tension is matched at the outlet of the shot blasting machine to promote the iron scale to be further stripped, so that the iron scale is removed more thoroughly;
(3) the shot blowing device of the shot blasting machine is matched with the dust removal system to remove the iron scale residue on the surface of the normalizing plate, so that the surface defect of the strip steel caused by the introduction of impurities in the subsequent process is avoided.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In this embodiment, the production process of the oriented silicon steel comprises the following steps: smelting → continuous casting → hot rolling → normalizing → iron scale removing → cold rolling → decarburization annealing → nitriding → coating MgO → high temperature annealing → hot stretch leveling and coating insulating film;
the main process parameters are as follows:
(1) smelting and continuous casting: and smelting a casting blank according to the conventional high-magnetic induction oriented silicon steel component, wherein the thickness of the casting blank is 230 mm.
(2) Hot rolling: after heating at 1200 ℃ the plate was rolled to a hot rolled plate of 2.3mm thickness.
(3) Normalizing: the normalizing annealing is carried out by adopting a two-stage process system of 1100 ℃ multiplied by 50s +930 ℃ multiplied by 180 s.
(4) Stretching straightening and shot blasting: after the normalizing plate is discharged from the furnace, carrying out mechanical dephosphorization treatment by using a withdrawal straightening machine, continuously crushing residual iron scales by using a shot blasting machine, and applying tension at the outlet of the shot blasting machine; and removing the iron scale residue on the surface of the normalizing plate by using a shot blowing device and a dust removal system of the shot blasting machine.
In the present example and comparative example, specific process parameters of the stretch straightening and shot blasting process are shown in Table 1.
TABLE 1 stretch straightening and shot blasting Process parameters
(5) Cold rolling:
and (3) carrying out 5-pass reversible rolling with the total reduction rate of 87% by adopting a 20-roller sendzimir rolling mill, wherein the reduction rates of all the passes are evenly distributed, and the steel plate is rolled to be 0.27mm thick.
(6) Decarburization and annealing:
during decarburization annealing, the temperature is raised to 850 ℃ at the speed of 900 ℃/min and the temperature is raised to 20 percent H2+80％N2、PH2O/PH2Keeping the temperature for 8min under the annealing atmosphere of 0.7, and decarburizing and annealing, and then removing carbon to below 25 ppm.
(7) Nitriding and MgO coating:
and (3) nitriding the decarburized annealing plate at low temperature, coating an annealing separating agent mainly containing MgO on the surface of the steel strip, and heating to 550 ℃ for drying.
(8) High-temperature annealing:
at high temperature annealing at N2Heating to 650 ℃ at the speed of 50 ℃/H in the atmosphere and keeping the temperature at 75% H2+25％N2Keeping the temperature for 24 hours under the mixed atmosphere; continuously heating to 850 ℃ at the speed of 20 ℃/h, and keeping the temperature for 3 h; then raising the temperature to 1200 ℃ at the speed of 18 ℃/h and preserving the temperature for 20 h. The temperature is reduced by furnace cooling, and the steel is taken out of the furnace when the temperature is reduced to 300 ℃.
(9) Stretching and flattening and coating an insulating film:
and after the insulating layer is coated and dried, hot stretching flattening annealing is carried out at 850 ℃.
The product quality is as follows:
the grain-oriented silicon steels produced in the examples and comparative examples had higher-grade surfaces after descaling, as shown in table 2. The steel plate after being descaled by the method has good surface, no iron scale residue and no difference with the surface quality of a pickled plate.
TABLE 2 surface quality of examples and comparative examples
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A method for producing oriented silicon steel without pickling after normalization is characterized in that the production process route of the oriented silicon steel is as follows: smelting → continuous casting → hot rolling → normalizing annealing → tensile straightening → shot blasting → cold rolling → decarburization annealing → nitriding → coating MgO → high temperature annealing → hot stretch leveling and coating insulating film; wherein:
the stretching and straightening process adopts a stretching and straightening machine to carry out mechanical dephosphorization treatment, and at least comprises 1 straightening process and 2-3 bending processes;
performing shot blasting treatment by using a shot blasting machine, and then purging the surface of the strip steel by using a shot purging device of the shot blasting machine to remove iron scale residues on the surface of the strip steel.
2. The method for producing oriented silicon steel without pickling after normalization of claim 1, wherein the bending roller has a diameter of
3. The method for producing oriented silicon steel without pickling after normalization of claim 1, wherein the outlet tension of the withdrawal and straightening machine is 20-25 KPa, and the elongation of the strip steel is 1-2%.
4. The method for producing oriented silicon steel without pickling after normalization according to claim 1, wherein the outlet tension of the shot blasting machine is 20-25 KPa.
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| JPH04238619A (en) * | 1991-01-09 | 1992-08-26 | Nippon Steel Corp | Method for treating belt like metallic body |
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| CN108080416A (en) * | 2017-12-28 | 2018-05-29 | 滁州宝岛特种冷轧带钢有限公司 | A kind of compact medium-width strip steel production process |
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2021
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| CN101633111A (en) * | 2008-07-22 | 2010-01-27 | 王志强 | Method and device for surface processing of steel belt |
| CN102744277A (en) * | 2012-07-23 | 2012-10-24 | 中冶南方工程技术有限公司 | Method for producing cold-rolled stainless steel annealing and pickling brand steel |
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Application publication date: 20210618 |