CN114351052B - Preparation method of cold-rolled electrical steel W470 - Google Patents
Preparation method of cold-rolled electrical steel W470 Download PDFInfo
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- CN114351052B CN114351052B CN202210033182.7A CN202210033182A CN114351052B CN 114351052 B CN114351052 B CN 114351052B CN 202210033182 A CN202210033182 A CN 202210033182A CN 114351052 B CN114351052 B CN 114351052B
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 95
- 239000010959 steel Substances 0.000 claims abstract description 95
- 238000000137 annealing Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 30
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 238000007670 refining Methods 0.000 claims abstract description 16
- 238000005097 cold rolling Methods 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 9
- 239000011593 sulfur Substances 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims description 19
- 238000004321 preservation Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 238000005098 hot rolling Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 8
- 238000005554 pickling Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 238000005261 decarburization Methods 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 28
- 229910052742 iron Inorganic materials 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 15
- 238000010583 slow cooling Methods 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000008642 heat stress Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C21D1/26—Methods of 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
- C21D8/1211—Rapid solidification; Thin strip casting
-
- 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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- 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
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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
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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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a preparation method of cold-rolled electrical steel W470. The method adopts an RH refining furnace for smelting, controls the content of sulfur and carbon, adopts a continuous casting mode to cast molten steel into a billet, heats the billet, anneals, acid-washes a hot rolled plate after annealing, and performs cold rolling at room temperature. In the preparation method of the cold-rolled electrical steel W470, the raw material proportion is reasonably controlled, the cost is reduced, the oxygen content of the steel is effectively reduced by controlling the oxygen content in the RH refining furnace, the cold workability is improved, the iron loss can reach the optimal value, and a motor made of the electrical steel W470 has low energy consumption and low noise, and is suitable for iron cores of various transformers, motors and generators.
Description
Technical Field
The invention relates to the technical field of non-oriented electrical steel production, in particular to a preparation method of cold-rolled electrical steel W470.
Background
The silicon steel sheet is a ferrosilicon soft magnetic alloy with extremely low carbon content, generally contains 0.5-4.5% of silicon, can improve the resistivity and the maximum permeability of iron by adding silicon, reduces coercive force, iron core loss (iron loss) and magnetic aging, is mainly used for manufacturing iron cores of various transformers, motors and generators, W470 refers to non-orientation, the iron loss value is 0.47W/kg, and the cold-rolled non-oriented silicon steel sheet is mainly used for generator manufacturing, so the cold-rolled non-oriented silicon steel sheet is also called cold-rolled motor silicon steel, contains 0.5-3.0% of silicon, is subjected to cold rolling to the thickness of finished products, is mainly a steel strip with the thickness of 0.35mm and 0.5mm, has the Bs higher than that of the oriented silicon steel, and compared with the hot-rolled silicon steel, the cold-rolled non-oriented silicon steel sheet has uniform thickness, high dimensional accuracy and smooth and flat surface, thereby improving the filling coefficient and the magnetic performance of the material.
With the requirements of energy conservation and consumption reduction, electrical steel is increasingly pursuing low iron loss and high magnetic induction, for this reason, production units mostly adopt a method for improving the content of alloy element Mn, and after the non-oriented electrical steel of different manufacturers is made into a small motor, the energy consumption is greatly different, and even some of the non-oriented electrical steel is expensive.
Disclosure of Invention
The invention aims to provide a preparation method of cold-rolled electrical steel W470, which optimizes the technical schemes of refining, continuous casting, hot rolling, annealing and cold rolling, saves the production cost, and has low energy consumption and low noise of a motor made of the electrical steel W470.
In order to achieve the above object, according to one aspect of the present application, the present invention provides a cold-rolled electrical steel W470, wherein the electrical steel W470 comprises the following chemical components by weight: less than or equal to 0.002 percent of C, 0.80 to 1.50 percent of Si, 0.10 to 0.15 percent of Mn, 0.001 to 0.002 percent of P, 0.002 to 0.004 percent of Al, 0.003 to 0.005 percent of S, less than or equal to 0.003 percent of N, 0.001 to 0.010 percent of Ti, 0.001 to 0.003 percent of B, 0.001 to 0.003 percent of Nb, 0.001 to 0.002 percent of V, 0.001 to 0.002 percent of N, and the balance of Fe and inevitable impurities;
according to one aspect of the present application, the present invention provides a method for preparing a cold rolled electrical steel W470, comprising the steps of:
step S101: smelting in an RH refining furnace, controlling the content of sulfur and carbon to be below 12 parts per million (ppm), controlling the vacuum degree to be below 60Pa, controlling the oxygen content of converter molten steel to be 500-700ppm, controlling the decarburization time to be more than 20min and the smelting time to be more than 40min, wherein the converter molten steel is oxygen-bearing steel;
step S102: casting the molten steel into billets in a continuous casting mode, taking the billets out of a furnace after the billets are heated to 1120-1200 ℃, using I-shaped steel to cushion the bottom, then sequentially stacking the billets, sealing the tops by using the I-shaped steel, and preserving heat for 8-20 hours;
step S103: heating the steel billet, controlling the temperature at 1300-1400 ℃, carrying out hot rolling after the temperature is uniform, wherein the initial rolling temperature is 1120-1250 ℃, and the thickness of a hot rolled plate is 0.6-2.0mm;
step S104: annealing, and the treatment conditions are as follows: the annealing temperature is 300-400 ℃, the heat preservation time is 0.5-5 hours, and then the hot rolled plate after annealing is obtained after furnace cooling;
step S105: and after annealing, pickling the hot rolled plate, and cold rolling at room temperature, wherein the pass rolling deformation is 8-30%, so that the W470 thin strip of the cold-rolled electrical steel with the thickness of 0.1-1.5mm is obtained.
According to one embodiment of the present application, the acid solution temperature for pickling the hot rolled sheet is 70 to 90 ℃ in step S105, and the cold rolling process is 7-pass rolling.
According to an embodiment of the present application, the billet heating in step S103 includes four stages, the first stage temperature is 550-720 ℃, the second stage temperature is 800-980 ℃, the third stage temperature is 1120-1250 ℃, and the fourth stage temperature is 1300-1400 ℃.
According to one embodiment of the present application, the holding time during hot rolling is 40-55 minutes, the finishing temperature is 920-1040 ℃, and the hot rolled strip coiling temperature is 640-710 ℃.
According to one embodiment of the present application, the acid solution temperature of the acid washing of the hot rolled plate is 75-80 ℃, and the cold rolling process is 4-pass rolling.
According to one embodiment of the present application, in step S102, the heat preservation cover is used to cover the heat preservation area, and after the heat preservation area, the salt water cooling or oil cooling is used.
According to one embodiment of the application, the speed of the hot-rolled sheet during annealing is between 90 and 95m/min.
According to one embodiment of the present application, the pressing rate is controlled to 61% -74% in step S105.
According to one embodiment of the present application, in step S101, the degree of vacuum is 38-52Pa.
Compared with the prior art, the preparation method of the cold-rolled electrical steel W470 provided by the invention adopts the technical scheme of optimizing chemical components, optimizing refining, continuous casting, hot rolling, annealing and cold rolling to produce the non-oriented electrical steel W470 with excellent magnetic property, has the excellent characteristics of uniform thickness, high dimensional precision, smooth and flat surface and the like, not only saves the production cost, but also has low energy consumption and low noise of a motor made of the electrical steel W470, and is suitable for iron cores of various transformers, motors and generators.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The application provides cold-rolled electrical steel W470 and a preparation method thereof.
According to one aspect of the application, the cold-rolled electrical steel W470 comprises the following chemical components in percentage by weight: less than or equal to 0.002 percent of C, 0.80 to 1.50 percent of Si, 0.10 to 0.15 percent of Mn, 0.001 to 0.002 percent of P, 0.002 to 0.004 percent of Al, 0.003 to 0.005 percent of S, less than or equal to 0.003 percent of N, 0.001 to 0.010 percent of Ti, 0.001 to 0.003 percent of B, 0.001 to 0.003 percent of Nb, 0.001 to 0.002 percent of V, 0.001 to 0.002 percent of N, and the balance of Fe and inevitable impurities.
Compared with the prior art, the electrical steel W470 provided by the invention has the advantages that the Mn content is strictly controlled in the chemical components, the contents of C, si, nb and V are optimized, the proportioning precision is high, and the surface of the produced electrical steel W470 is smooth and flat by combining the optimized production process.
According to another aspect of the application, the preparation method of the cold-rolled electrical steel W470 provided by the embodiment of the invention comprises the following steps:
step S101: smelting in an RH refining furnace, controlling the content of sulfur and carbon to be less than 12ppm, controlling the vacuum degree to be less than 60Pa, controlling the oxygen content of converter molten steel to be 500-700ppm, controlling the decarburization time to be more than 20min, and controlling the smelting time to be more than 40min;
step S102: casting molten steel into a billet by adopting a continuous casting mode, discharging the billet after heating the billet to 1120-1200 ℃, using I-shaped steel to cushion the bottom, then stacking the billets in sequence, sealing the top by using the I-shaped steel, and preserving heat for 8-20h;
step S103: heating the steel billet, controlling the temperature at 1300-1400 ℃, carrying out hot rolling after the temperature is uniform, wherein the initial rolling temperature is 1120-1250 ℃, and the thickness of a hot rolled plate is 0.6-2.0mm;
step S104: annealing, and the treatment conditions are as follows: annealing at 300-400 ℃ for 0.5-5 hours, and then cooling along with the furnace to obtain an annealed hot-rolled plate;
step S105: and after annealing, pickling the hot rolled plate, and cold rolling at room temperature, wherein the pass rolling deformation is 8-30%, so that the W470 thin strip of the cold-rolled electrical steel with the thickness of 0.1-1.5mm is obtained.
Compared with the prior art, in the preparation method of the cold-rolled electrical steel W470, the raw material proportion is reasonably controlled, the cost is reduced, the RH refining furnace is used for controlling the oxygen content, the oxygen content of the steel is effectively reduced, the oxidation of C, P is prevented, the i-shaped steel and the steel billets are sequentially stacked in a staggered distribution mode, the internal structure of the steel plate is improved through annealing treatment, the electrical steel with moderate hardness and good processability is obtained, the thermal stress and the structural stress of the steel billets are relieved through the slow cooling process, the improvement of cold workability is facilitated, the iron loss can reach the optimal value, and the method has the excellent characteristics of uniform thickness, high dimensional precision, smooth and flat surface and the like, and meanwhile, the production stability of the product is high, and the electromagnetic performance is improved.
The following will describe each step in the method for producing electrical steel W470 provided in the examples of the present invention in detail.
Step S101: smelting in an RH refining furnace, controlling the content of sulfur and carbon to be below 12ppm, controlling the vacuum degree to be below 60Pa, controlling the molten steel of the converter to be oxygenated steel, controlling the oxygen content to be between 500 and 700ppm, and controlling the decarburization time to be more than 20min and the smelting time to be more than 40min; the invention controls oxygen content in the RH refining furnace, effectively reduces the oxygen content of steel, thereby preventing C, P from being oxidized.
Step S102: casting the molten steel into billets in a continuous casting mode, taking the billets out of a furnace after the billets are heated to 1120-1200 ℃, using I-shaped steel to cushion the bottom, then sequentially stacking the billets, sealing the tops by using the I-shaped steel, and preserving heat for 8-20 hours; the steel billets are stacked in sequence in a mode that the I-shaped steel and the steel billets are distributed in a staggered mode, and the heat stress and the structural stress of the steel billets are relieved by the slow cooling process.
Step S103: heating the steel billet, controlling the temperature at 1300-1400 ℃, carrying out hot rolling after the temperature is uniform, wherein the initial rolling temperature is 1120-1250 ℃, and the thickness of a hot rolled plate is 0.6-2.0mm; the steel billet has the advantages that thick and uneven structures in the steel billet are improved, the production efficiency of steel is improved, the problem of cracking of the steel billet is solved, and the qualification rate of steel plates is greatly improved.
Step S104: annealing, and the treatment conditions are as follows: annealing at 300-400 ℃ for 0.5-5 hours, and then cooling along with the furnace to obtain an annealed hot-rolled plate; the annealing treatment improves the internal structure of the steel plate, and the electrical steel with moderate hardness and better processability is obtained.
Step S105: and after annealing, pickling the hot rolled plate, and cold rolling at room temperature, wherein the pass rolling deformation is 8-30%, so that the cold-rolled electrical steel W470 thin strip with the thickness of 0.1-1.5mm is obtained, the cold workability is improved, and the iron loss can reach an optimal value.
In order to explain the method for producing the electrical steel W470 provided in the examples of the present invention in detail, the following will explain the examples in detail.
Example one
The embodiment provides a preparation method of cold-rolled electrical steel W470, which comprises the following steps:
step S101: smelting in an RH refining furnace, controlling the content of sulfur and carbon to be less than 12ppm, controlling the vacuum degree to be less than 60Pa, controlling the molten steel of the converter to be oxygenated steel, controlling the oxygen content to be 700ppm, controlling the decarburization time to be more than 20min, controlling the smelting time to be more than 40min and controlling the vacuum degree to be 38Pa.
The invention controls oxygen content and vacuum degree in the RH refining furnace, controls the content of sulfur and carbon, and effectively reduces the oxygen content of steel, thereby preventing C, P from being oxidized and improving the quality of steel products.
Step S102: casting molten steel into a billet by adopting a continuous casting mode, discharging the billet after heating the billet to 1200 ℃, sequentially stacking the billets by using I-shaped steel padding, sealing the uppermost surface by using the I-shaped steel, and preserving heat for 20 hours; and (4) wrapping the heat preservation cover for heat preservation, and cooling the heat preservation cover by using brine or oil. The steel billets are stacked in sequence in a mode that the I-shaped steel and the steel billets are distributed in a staggered mode, the heat stress and the structural stress of the steel billets are relieved by the slow cooling process, and the steel billets are cooled by salt water or oil and are cooled rapidly after heat preservation.
Step S103: heating a steel billet, controlling the temperature at 1400 ℃, carrying out hot rolling after the temperature is uniform, wherein the initial rolling temperature is 1120 ℃, and the thickness of a hot rolled plate is 0.6mm; the billet heating comprises four stages, wherein the temperature of the first stage is 550 ℃, the temperature of the second stage is 800 ℃, the temperature of the third stage is 1250 ℃, and the temperature of the fourth stage is 1300 ℃. The heat preservation time in the hot rolling process is 55 minutes, the finishing temperature is 1040 ℃, and the hot rolled steel strip coiling temperature is 640 ℃. The steel billet has the advantages that thick and uneven structures in the steel billet are improved, the production efficiency of steel is improved, the problem of cracking of the steel billet is solved, and the qualification rate of steel plates is greatly improved.
Step S104: annealing, and the treatment conditions are as follows: annealing at 400 ℃ for 0.5 hour, and then cooling along with the furnace to obtain an annealed hot-rolled plate; the speed of the hot rolled plate during annealing is 95m/min. The annealing treatment improves the internal structure of the steel plate, and the electrical steel with moderate hardness and good processability is obtained.
Step S105: after annealing, the hot rolled sheet was pickled and cold rolled at room temperature with a pass rolling strain of 30% to obtain a W470 thin strip of cold rolled electrical steel having a thickness of 0.1 mm. The acid liquor temperature for pickling the hot rolled plate is 75-80 ℃, and the cold rolling process is 4-pass rolling. The method has the advantages that the method is favorable for improving cold workability by controlling the downward pressure rate, the iron loss can reach the optimal value, the cost is reduced by reasonably controlling the raw material proportion, the RH refining furnace is used for controlling the oxygen content, the oxygen content of steel is effectively reduced, the oxidation of C, P is prevented, the steel billets are sequentially stacked in a mode of staggered distribution of I-shaped steel and the steel billets, the internal structure of the steel plate is improved by annealing treatment, the electrical steel with moderate hardness and better workability is obtained, the thermal stress and the structural stress of the steel billets are reduced by the slow cooling process, the improvement of the cold workability is facilitated, the iron loss can reach the optimal value, and the method has the excellent characteristics of uniform thickness, high size precision, smooth and flat surface and the like, and meanwhile, the stability of product production is high, and the electromagnetic performance is improved.
Example two
The embodiment provides a preparation method of cold-rolled electrical steel W470, which comprises the following steps:
step S101: smelting in an RH refining furnace, controlling the content of sulfur and carbon to be less than 12ppm, controlling the vacuum degree to be less than 60Pa, controlling the oxygen content of converter molten steel to be 500ppm, decarbonizing for more than 20min, smelting for more than 40min, and specifically controlling the vacuum degree to be 52Pa.
The invention controls oxygen carrying amount and vacuum degree in the RH refining furnace, controls the contents of sulfur and carbon, and effectively reduces the oxygen content of steel, thereby preventing C, P from being oxidized and improving the quality of steel products.
Step S102: casting molten steel into a billet by adopting a continuous casting mode, discharging the billet after heating the billet to 1120 ℃, sequentially stacking the billets by using I-shaped steel bedding, sealing the uppermost surface by using the I-shaped steel, and preserving heat for 8 hours; and (4) wrapping the heat preservation cover for heat preservation, and cooling with salt water or oil after heat preservation. The steel billets are stacked in sequence in a mode that the I-shaped steel and the steel billets are distributed in a staggered mode, the heat stress and the structural stress of the steel billets are relieved by the slow cooling process, and the steel billets are cooled by salt water or oil and are cooled rapidly after heat preservation.
Step S103: heating a steel billet, controlling the temperature at 1300 ℃, carrying out hot rolling after the temperature is uniform, wherein the initial rolling temperature is 1250 ℃, and the thickness of a hot rolled plate is 2.0mm; the billet heating comprises four stages, wherein the temperature of the first stage is 720 ℃, the temperature of the second stage is 980 ℃, the temperature of the third stage is 1120 ℃, and the temperature of the fourth stage is 1400 ℃. The heat preservation time in the hot rolling process is 40 minutes, the finish rolling temperature is 920 ℃, and the hot rolled steel strip coiling temperature is 710 ℃. The steel billet has the advantages that thick and uneven structures in the steel billet are improved, the production efficiency of steel is improved, the problem of cracking of the steel billet is solved, and the qualified rate of steel plates is greatly improved.
Step S104: annealing, and the treatment conditions are as follows: annealing at 350 ℃, keeping the temperature for 5 hours, and then cooling along with the furnace to obtain an annealed hot-rolled plate; the strip speed of the hot rolled plate during annealing is 90m/min. The annealing treatment improves the internal structure of the steel plate, and the electrical steel with moderate hardness and good processability is obtained.
Step S105: after annealing, the hot rolled sheet was pickled and cold rolled at room temperature with a pass rolling strain of 15% to obtain a 1mm thick W470 thin strip of cold rolled electrical steel. The acid liquor temperature for pickling the hot rolled plate is 70-90 ℃, and the cold rolling process is 7-pass rolling. The method has the advantages that the method is favorable for improving cold workability by controlling the downward pressure rate, the iron loss can reach the optimal value, the cost is reduced by reasonably controlling the raw material proportion, the RH refining furnace is used for controlling the oxygen content, the oxygen content of steel is effectively reduced, the oxidation of C, P is prevented, the steel billets are sequentially stacked in a mode of staggered distribution of I-shaped steel and the steel billets, the internal structure of the steel plate is improved by annealing treatment, the electrical steel with moderate hardness and better workability is obtained, the thermal stress and the structural stress of the steel billets are reduced by the slow cooling process, the improvement of the cold workability is facilitated, the iron loss can reach the optimal value, and the method has the excellent characteristics of uniform thickness, high size precision, smooth and flat surface and the like, and meanwhile, the stability of product production is high, and the electromagnetic performance is improved.
The comparative examples of the cold-rolled electrical steel W470 obtained in the first and second examples and the general electrical steel W470 on the market were subjected to performance tests, and the test results are shown in the following tables one and two.
Table one:
table two:
in the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The preparation method of the cold-rolled electrical steel W470 is characterized in that the electrical steel W470 comprises the following chemical components in percentage by weight: less than or equal to 0.002 percent of C, 0.80 to 1.50 percent of Si, 0.10 to 0.15 percent of Mn, 0.001 to 0.002 percent of P, 0.002 to 0.004 percent of Al, 0.003 to 0.005 percent of S, less than or equal to 0.003 percent of N, 0.001 to 0.010 percent of Ti, 0.001 to 0.003 percent of B, 0.001 to 0.003 percent of Nb, 0.001 to 0.002 percent of V, 0.001 to 0.002 percent of N, and the balance of Fe and inevitable impurities;
the preparation method comprises the following steps:
step S101: smelting in an RH refining furnace, controlling the content of sulfur and carbon to be less than 12ppm, controlling the vacuum degree to be less than 60Pa, controlling the oxygen content of converter molten steel to be 500-700ppm, controlling the decarburization time to be more than 20min, and controlling the smelting time to be more than 40min;
step S102: casting molten steel into a billet by adopting a continuous casting mode, discharging the billet after heating the billet to 1120-1200 ℃, bedding the billet by utilizing I-shaped steel, then sequentially stacking the billet by utilizing a mode that the I-shaped steel and the billet are distributed in a staggered mode, sealing the top by utilizing the I-shaped steel, and preserving heat for 8-20 hours;
step S103: heating the steel billet, controlling the temperature at 1300-1400 ℃, carrying out hot rolling after the temperature is uniform, wherein the initial rolling temperature is 1120-1250 ℃, and the thickness of a hot rolled plate is 0.6-2.0mm;
step S104: annealing, and the treatment conditions are as follows: the annealing temperature is 300-400 ℃, the heat preservation time is 0.5-5 hours, and then the hot rolled plate after annealing is obtained after furnace cooling;
step S105: and after annealing, pickling the hot rolled plate, and cold rolling at room temperature with pass rolling deformation of 8-30% to obtain the W470 thin strip of the cold-rolled electrical steel with the thickness of 0.1-1.5 mm.
2. The method of claim 1, wherein the acid solution temperature for pickling the hot rolled sheet is 70-90 ℃ and the cold rolling process is 7-pass rolling in step S105.
3. The method of claim 1, wherein the step S103, the heating of the steel slab comprises four stages, a first stage temperature of 550-720 ℃, a second stage temperature of 800-980 ℃, a third stage temperature of 1120-1250 ℃, and a fourth stage temperature of 1300-1400 ℃.
4. The method of claim 1, wherein the holding time during hot rolling is 40 to 55 minutes, the finishing temperature is 920 to 1040 ℃, and the hot rolled strip coiling temperature is 640 to 710 ℃.
5. The method of claim 1, wherein the acid solution temperature of the acid washing of the hot rolled plate in step S105 is 75-80 ℃, and the cold rolling process is 4-pass rolling.
6. The method of claim 1, wherein in step S102, the heat preservation cover is used for covering and preserving heat, and after the heat preservation, the salt water cooling or the oil cooling is used.
7. The method according to claim 1, wherein the hot-rolled sheet is annealed at a strip speed of 90 to 95m/min.
8. The method of claim 1, wherein the pressing rate is controlled to be 61% -74% in step S105.
9. The method of claim 1, wherein the degree of vacuum is 38 to 52Pa in step S101.
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