CN114686769B - Low-cost cold-rolled steel strip for electricians and manufacturing method thereof - Google Patents
Low-cost cold-rolled steel strip for electricians and manufacturing method thereof Download PDFInfo
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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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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
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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
- C22C38/04—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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- 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 low-cost cold-rolled strip for electricians and a manufacturing method thereof, belonging to the field of metal material processing. Comprises the following components in percentage by weight: less than or equal to 0.0040 percent of C, 0.250 to 0.450 percent of Si, 0.20 to 0.40 percent of Mn, 0.050 to 0.070 percent of P, less than or equal to 0.012 percent of S and 0.150 to 0.350 percent of Als; the balance being Fe and other residual trace elements. The invention provides a full-flow manufacturing method on the premise of not adding precious alloy elements, not obviously increasing the production cost of the processing industry and depending on the conventional steelmaking, hot continuous rolling, acid continuous rolling and continuous annealing production line: in the pure components of the ultra-low carbon steel, a proper amount of elements such as silicon, manganese, phosphorus, sulfur, aluminum and the like are added, and the finished product crystal grains of the electrical cold-rolled steel strip are fully recrystallized and grown up through precise hot and cold rolling processes, so that the increase of the texture ratio is facilitated, the magnetic performance is improved, the strip shape is stable, and the thickness and the width of the strip are controlled.
Description
Technical Field
The invention relates to the field of metal material processing, in particular to a low-cost cold-rolled strip for electricians and a manufacturing method thereof.
Background
The cold-rolled electrical steel has the characteristics of uniform thickness, high dimensional precision, smooth and flat surface, simple production process, high magnetic induction intensity, high iron loss and the like, and is mainly used for producing household appliances, micromotors, small motors, ballasts, small transformers and the like. The low-grade non-oriented electrical steel is suitable for manufacturing miniature and medium-sized and small-sized motors because of the characteristics of high magnetic induction intensity, simple process, low manufacturing cost and the like, and can improve the efficiency of the motors, reduce the power consumption, reduce the volume of the motors and save the manufacturing materials of the motors. However, the existing production of cold-rolled electrical steel has the problems of unreasonable product structure, unstable product quality, high price and the like.
The most concerned index of customers of electrical steel in the use process is eddy current loss (iron loss), which is expressed as heating in the use process, and the iron loss of the lowest-grade (W1300) silicon steel used in the current market is 5.2-5.8W/Kg. The iron loss of a common cold plate is 12-15W/Kg, the iron loss can be controlled within 9W/Kg by using a non-coated cold-rolled plate and combining components and process adjustment, and the common cold plate can be used for replacing partial low-grade silicon steel products and is used for products insensitive to temperature, such as water pumps (with a cooling function), electric tools (with shorter working time), small transformers (with shorter working time) of washing machines and the like and fans (with heat dissipation).
CN113564489A discloses a low-grade non-oriented electrical steel and a manufacturing method thereof, on the basis of the components of the existing low-grade non-oriented electrical steel, the Al element content is improved by 0.08wt.% to 0.12wt.%, namely, the Al content of a finished product of a plate blank is controlled to be 0.58wt.% to 1.62wt.% during steel making, and the rolling stability is prevented from being influenced by rolling force fluctuation caused by phase change during hot rolling and finish rolling. The method improves the content of Al element, needs to invest more aluminum particles, has higher production cost than the existing non-oriented electrical steel, and is easy to generate furnace roller nodulation and pollute the emulsion problem of the conventional cold rolling production line.
CN112921164A discloses a low iron loss high magnetic conductivity non-oriented electrical steel and a production method thereof, wherein the chemical component in percentage by weight is that C is less than or equal to 0.0030 percent; si is more than or equal to 0.10 percent and less than or equal to 1.00 percent; mn is more than or equal to 0.10 percent and less than or equal to 0.40 percent; p is less than or equal to 0.0050 percent; als is more than or equal to 0.50 percent and less than or equal to 1.00 percent; s is less than or equal to 0.0025 percent, the hot rolled plate needs to be subjected to normalizing treatment, after cold rolling, the hot rolled plate is soaked in an alkali metal salt aqueous solution for 15 seconds before annealing, then annealing is carried out, secondary annealing is carried out under the protection of nitrogen, and the heat preservation time is 2-2.5 hours. The high content of Si and Al increases the alloy cost, a common production line cannot be normalized, a special silicon steel production line is needed for production, the process is complex, the production rhythm is influenced, and the production cost is increased.
CN103614615A discloses a method for manufacturing low-cost cold-rolled non-oriented electrical steel, which is characterized in that: the thin slab comprises the following chemical components in percentage by weight: less than or equal to 0.01 percent of C, less than or equal to 1.0 percent of Si, less than or equal to 0.3 percent of Mn, less than or equal to 0.15 percent of P, less than or equal to 0.005 percent of Als and less than or equal to 0.01 percent of S, wherein the Si content is more than or equal to 0.6 percent and less than or equal to 1.0 percent, the Mn content is more than or equal to 0.3 percent and less than or equal to 0.15 percent, the P content is more than or equal to 0.08 percent and less than or equal to 0.15 percent. The hot rolled plate is made into a finished product of the electrical steel strip with the thickness of 0.5mm through acid pickling, continuous rolling, annealing and coating. The method has low Al element content, reduces the cost of the electrical steel by about 100 yuan/ton, but has high Si element content, and easily causes the problems of steel making water gap blockage, furnace roller nodulation of an annealing furnace and emulsion pollution. In addition, the coating is needed, one more production process is needed, and the production cost is increased.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a low-cost cold-rolled electrical steel strip and a method for manufacturing the same, so as to solve the above problems. The invention provides a full-flow manufacturing method on the premise of not adding precious alloy elements, not obviously increasing the production cost of the processing industry and depending on the conventional steelmaking, hot continuous rolling, acid continuous rolling and continuous annealing production line: in the pure components of the ultra-low carbon steel, a proper amount of elements such as silicon, manganese, phosphorus, sulfur, aluminum and the like are added, and the finished product crystal grains of the electrical cold-rolled steel strip are fully recrystallized and grown up through precise hot and cold rolling processes, so that the increase of the ratio of texture is facilitated, the magnetic property is improved, the shape is stable, and the thickness and the width of the whole strip are controlled.
The technical scheme of the invention is as follows:
a low-cost cold-rolled strip for electricians comprises the following components in percentage by weight: less than or equal to 0.0040 percent of C, 0.250 to 0.450 percent of Si, 0.20 to 0.40 percent of Mn, 0.050 to 0.070 percent of P, less than or equal to 0.012 percent of S and 0.150 to 0.350 percent of Als; the balance being Fe and other residual trace elements.
The preparation method of the cold-rolled steel strip for electricians comprises the following steps: (1) steel making; (2) hot continuous rolling; (3) acid continuous rolling; (4) continuous annealing; and (5) flattening.
The steel making comprises the following steps: performing KR slagging-off treatment on all the molten iron fed into the furnace, controlling the mass fraction of sulfur after treatment to be less than or equal to 0.003 percent, and not adding sulfur-containing alloy in the later process; blowing argon in the whole process of the converter, wherein the calming time from RH breaking of the ladle to casting of the casting machine is more than or equal to 30min; the continuous casting tundish adopts an ultra-low carbon covering agent, adopts special ultra-low carbon steel and high aluminum covering slag, adopts an automatic control mode for the liquid level fluctuation of the crystallizer, and pours the liquid level fluctuation less than or equal to +/-3 mm at a constant drawing speed of more than or equal to 0.9m/min to obtain the continuous casting billet conforming to the design components.
The hot continuous rolling comprises the following steps: the heating temperature of the plate blank is 1200-1260 ℃, and the furnace time is 140-260 min; seven frames are used for continuous rolling, the initial rolling temperature of rough rolling is 1050-1090 ℃, the initial rolling temperature of finish rolling is 985-1015 ℃, and the final rolling temperature of finish rolling is 885-915 ℃; a rear-section sparse cooling mode is adopted after rolling; the U-shaped coiling is used, the coiling temperature is 710 +/-15 ℃ within 40 meters of the head and the tail, and the middle part is 680 +/-15 ℃.
The acid continuous rolling comprises the following steps: adding a pickling inhibitor with the concentration of 1-2 per mill 2 hours in advance into a pickling tank, wherein the pickling process speed is more than or equal to 100m/min, and the process section outlet inspection confirms that the surface of the steel plate is not over-pickled or under-pickled; five stands are used for continuous rolling, and the total rolling reduction rate is 78.33-88.0%.
The continuous annealing comprises the following steps: the annealing speed is less than or equal to 160m/min, the hydrogen content in the furnace is 3-7%, the oxygen content is less than or equal to 10ppm, and the furnace pressure is 100-400 Pa; the soaking temperature is 820-840 ℃, the slow cooling end point temperature is 640-660 ℃, the fast cooling end point temperature is 440-460 ℃, the aging end point temperature is 345-375 ℃, and the final cooling tapping temperature is less than or equal to 155 ℃;
the leveling is as follows: the working roll is a chrome-plated roll, the roughness (Ra) of the roll is 2.0-2.8 mu m, the peak value (Pc) of the working roll is 90-100 cm, the concentration of the leveling liquid is 3%, the leveling elongation is 0.5%, the surface roughness (Ra) of the strip steel is 0.3-1.00 mu m, and the roll is immediately replaced online when the roll is not conformed to the requirements.
The invention has the beneficial effects that:
the invention provides a full-flow manufacturing method of a low-cost cold-rolled steel strip for electricians, which is characterized in that carbon (less than or equal to 0.0040 percent), silicon (0.250-0.450 percent), manganese (0.200-0.400 percent), phosphorus (0.050-0.070 percent), sulfur (less than or equal to 0.012 percent) and acid-soluble aluminum (0.150-0.350 percent) elements are added into pure components of ultra-low carbon steel in proper proportion, and a proper amount of sulfur elements (less than or equal to 0.003 percent) are reserved in KR desulfurization and converter processes. By increasing the content of the beneficial element Si (0.250-0.450%) and Al (0.150-0.350%), the average grain size of the recrystallization texture can be increased, and the larger the grain size, the smaller the grain boundary, thereby reducing the hysteresis loss. By controlling the content of harmful S element (less than or equal to 0.012 percent), the phenomenon that fine MnS formed by sulfur and manganese in steel can strongly hinder the grain growth of finished products during annealing is avoided, thereby improving the magnetic performance of silicon steel. The content of Mn element (0.20-0.40%) is increased to be beneficial to coarsening the inclusion and reduce the inhibition effect on the growth of the grain boundary. By adding 0.050% -0.070% of P element into the electrical steel, ferrite can be strengthened, hardness is improved, and punching performance is improved. By adopting a three-low-one-high process system of low-temperature heating (1240 ℃), low-temperature rolling (1060 ℃), low finishing temperature (900 ℃) and high-temperature coiling (680 ℃), the post-finishing-rolling rear-section sparse laminar cooling can coarsen crystal grains, which is beneficial to reducing iron loss and improving magnetic induction. By higher temperature annealing (830 ℃), the average grain size is increased, the structure is more uniform, the strength of the favorable rotating cubic texture {100} <110> and the Gaussian texture {110} <001> is high, the magnetic performance iron loss of the final finished product is obviously reduced, and the magnetic induction is improved. By controlling the continuous annealing speed as low as possible, the grains are recrystallized and grown sufficiently, further improving the magnetic properties. Through the control of optimized roll parameters and a flattening process, the surface roughness (Ra) of the strip steel through plate is ensured to be 0.3-1.00 mu m, and the magnetic property of the finished product of the electrical cold-rolled strip steel is comprehensively improved.
The invention relies on the conventional steel-making, hot continuous rolling, acid continuous rolling and continuous annealing production line, and realizes the low-cost and stable production of the cold-rolled steel strip for electricians by adjusting the design of components such as carbon, silicon, manganese, phosphorus, sulfur, aluminum and the like and the optimal consistent control of smelting, continuous casting, hot continuous rolling, acid continuous rolling, continuous annealing and leveling processes on the basis of ultra-low carbon steel without adding precious alloy and without obviously increasing the production cost. The tensile strength of the target cold-rolled steel strip finished product for electrical engineering obtained by the invention is not lower than 300MPa, the elongation A50 after fracture is not lower than 20%, the iron loss is controlled within 9W/Kg, the same plate difference is not more than 12 mu m, the plate shape is stable, the thickness and the width of the through plate can be accurately controlled, and the strict comprehensive quality requirements of downstream electrical steel customers on the cold-rolled steel plate for electrical engineering are completely met. The invention has remarkable economic benefit and brand benefit and is very suitable for popularization and application in domestic mainstream iron and steel enterprises.
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 metallographic structure diagram of a cold-rolled electric steel strip in example 1 of the present invention.
FIG. 2 is a metallographic structure diagram of a cold-rolled electric steel strip in example 2 of the present invention.
FIG. 3 is a metallographic structure drawing of a cold-rolled electrical steel strip in example 3 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.
A low-cost cold-rolled strip for electricians comprises the following components in percentage by weight: 0.0024% of C, 0.34% of Si, 0.32% of Mn, 0.064% of P, 0.007% of S and 0.18% of Als; the balance being Fe and other residual trace elements.
Example 1
The manufacturing method of the cold-rolled strip for the electrician comprises the following steps:
(1) Steel making, wherein all KR slag skimming treatment is carried out on molten iron fed into a furnace, the mass fraction of sulfur after treatment is controlled to be 0.003%, and sulfur-containing alloy is not added in the later process; argon is blown in the whole process of the converter, and the calming time from RH breaking of the ladle to casting of the casting machine is 44min; the continuous casting tundish adopts an ultra-low carbon covering agent and ultra-low carbon steel high-aluminum special covering slag, the liquid level fluctuation of the crystallizer adopts an automatic control mode, the liquid level fluctuation is +/-2.0 mm, and continuous casting billet which accords with the design composition is obtained by casting at a constant casting speed of 1.2 m/min;
(2) Hot continuous rolling, wherein the heating temperature of the plate blank is 1240 ℃, and the furnace time is 234min; seven stands are used for continuous rolling, the initial rolling temperature of rough rolling is 1083 ℃, the initial rolling temperature of finish rolling is 1000 ℃, and the final rolling temperature of finish rolling is 887 ℃; a rear-section sparse cooling mode is adopted after rolling; throwing U-shaped coiling, wherein the coiling temperature is 710 ℃ within 40 meters of the head and the tail, and the middle part is 678 ℃;
(3) Acid continuous rolling, wherein a pickling inhibitor with the concentration of 1.0 per mill is added into a pickling tank 2 hours in advance, the pickling process speed is 700m/min, and process section outlet inspection confirms that the surface of a steel plate is not over-pickled or under-pickled; five frames are continuously rolled, and the total reduction rate is 87.6%;
(4) Continuous annealing at the annealing speed of 139m/min, the hydrogen content in the furnace of 3.3 percent, the oxygen content of 3ppm and the furnace pressure of 346Pa; the soaking temperature is 830 ℃, the slow cooling end point temperature is 650 ℃, the fast cooling end point temperature is 450 ℃, the aging end point temperature is 362 ℃, and the final cooling tapping temperature is 148 ℃;
(5) Leveling, wherein the working roll is a chrome-plated roll, the roughness (Ra) of the roll is 2.6 mu m, the peak value (Pc) of the working roll is 95cm, the concentration of a leveling solution is 3 percent, the leveling elongation is 0.5 percent, the surface roughness (Ra) of the strip steel is 0.754 mu m, and the roll is immediately replaced online when the roll does not conform to the requirements.
Example 2
The manufacturing method of the cold-rolled strip for the electrician comprises the following steps:
(1) Steel making, wherein all KR slag skimming treatment is carried out on molten iron fed into a furnace, the mass fraction of sulfur after treatment is controlled to be 0.003%, and sulfur-containing alloy is not added in the later process; argon is blown in the whole process of the converter, and the calming time from RH breaking of the ladle to casting of the casting machine is 44min; the continuous casting tundish adopts an ultra-low carbon covering agent and ultra-low carbon steel and high aluminum special covering slag, the liquid level fluctuation of the crystallizer adopts an automatic control mode, the liquid level fluctuation is +/-2.0 mm, and continuous casting billet steel which meets the design components is obtained at a constant casting speed of 1.2 m/min;
(2) Hot continuous rolling, wherein the heating temperature of the plate blank is 1240 ℃, and the in-furnace time is 233min; seven frames are used for continuous rolling, the initial rolling temperature of rough rolling is 1068 ℃, the initial rolling temperature of finish rolling is 996 ℃, and the finish rolling temperature is 891 ℃; a rear-section sparse cooling mode is adopted after rolling; throwing U-shaped coiling, wherein the coiling temperature is 716 ℃ within 40 meters of the head and the tail, and the middle part is 680 ℃;
(3) Acid continuous rolling, wherein a pickling inhibitor with the concentration of 1.0 per thousand is added into a pickling tank 2 hours in advance, the pickling process speed is 557m/min, and the process section outlet inspection confirms that the surface of the steel plate is not over-pickled or under-pickled; five frames are continuously rolled, and the total reduction rate is 87.6%;
(4) Continuous annealing at the annealing speed of 139m/min, the hydrogen content in the furnace of 3.4 percent, the oxygen content of 3ppm and the furnace pressure of 362Pa; the soaking temperature is 830 ℃, the slow cooling end point temperature is 650 ℃, the fast cooling end point temperature is 450 ℃, the aging end point temperature is 364 ℃, and the final cooling tapping temperature is 153 ℃;
(5) Leveling, wherein the working roll is a chrome-plated roll, the roughness (Ra) of the roll is 2.6 mu m, the peak value (Pc) of the working roll is 95cm, the concentration of a leveling solution is 3%, the leveling elongation is 0.5%, the surface roughness (Ra) of the strip steel is 0.729 mu m, and the roll replacement is carried out immediately on line when the roughness is not met.
Example 3
The manufacturing method of the cold-rolled strip for electricians comprises the following steps:
(1) Steel making, wherein all KR slag skimming treatment is carried out on molten iron fed into a furnace, the mass fraction of sulfur after treatment is controlled to be 0.003%, and sulfur-containing alloy is not added in the later process; argon is blown in the whole process of the converter, and the calming time from RH breaking of the ladle to casting of the casting machine is 44min; the continuous casting tundish adopts an ultra-low carbon covering agent and ultra-low carbon steel and high aluminum special covering slag, the liquid level fluctuation of the crystallizer adopts an automatic control mode, the liquid level fluctuation is +/-2.0 mm, and continuous casting billet steel which meets the design components is obtained at a constant casting speed of 1.2 m/min;
(2) Hot continuous rolling, wherein the heating temperature of the plate blank is 1240 ℃, and the furnace time is 230min; seven frames are used for continuous rolling, the initial rolling temperature of rough rolling is 1066 ℃, the initial rolling temperature of finish rolling is 994 ℃, and the finish rolling temperature is 885 ℃; a rear-section sparse cooling mode is adopted after rolling; throwing U-shaped coiling, wherein the coiling temperature is 696 ℃ in 40 meters at the head and tail parts, and the middle part is 678 ℃;
(3) Acid continuous rolling, wherein a pickling inhibitor with the concentration of 1.0 per thousand is added into a pickling tank 2 hours in advance, the pickling process speed is 687m/min, and the process section outlet inspection confirms that the surface of the steel plate is not over-pickled or under-pickled; five frames are continuously rolled, and the total reduction rate is 87.6%;
(4) Continuous annealing at the annealing speed of 139m/min, the hydrogen content in the furnace of 3.3 percent, the oxygen content of 3ppm and the furnace pressure of 386Pa; the soaking temperature is 830 ℃, the slow cooling end point temperature is 650 ℃, the fast cooling end point temperature is 450 ℃, the aging end point temperature is 361 ℃, and the final cooling tapping temperature is 149 ℃;
(5) And (4) leveling, wherein the working roll is a chromium-plated roll, the roughness (Ra) of the roll is 2.6 micrometers, the peak value (Pc) of the working roll is 95cm, the concentration of a leveling solution is 3%, the leveling elongation is 0.5%, the surface roughness (Ra) of the strip steel is 0.713 micrometers, and the roll is immediately replaced online when the roughness is not met.
The cold-rolled steel strips prepared in examples 1 to 3 were tested for their comprehensive properties and the same plate difference, and the results are shown in tables 1 and 2 below:
TABLE 1 test results of cold rolled steel strips in examples 1 to 3
Table 2 examples 1-3 cold rolled steel strip in-plane difference test results
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 (6)
1. A low-cost cold-rolled strip for electricians is characterized by comprising the following components in percentage by weight: less than or equal to 0.0040 percent of C, 0.250 to 0.450 percent of Si, 0.20 to 0.40 percent of Mn, 0.050 to 0.070 percent of P, less than or equal to 0.012 percent of S, and 0.150 to 0.350 percent of AlsC; the balance of Fe and other residual trace elements;
the preparation method of the cold-rolled steel strip for the cost electrician comprises the following steps: (1) steel making; (2) hot continuous rolling; (3) acid continuous rolling; (4) continuous annealing; (5) leveling;
the hot continuous rolling comprises the following steps: the heating temperature of the plate blank is 1200-1260 ℃, and the furnace time is 140-260 min; seven frames are used for continuous rolling, the initial rolling temperature of rough rolling is 1050-1090 ℃, the initial rolling temperature of finish rolling is 985-1015 ℃, and the final rolling temperature of finish rolling is 885-915 ℃.
2. The low cost electrical cold rolled steel strip as claimed in claim 1, wherein said steelmaking comprises: performing KR slag skimming treatment on all the molten iron fed into the furnace, and controlling the mass fraction of sulfur after treatment to be less than or equal to 0.003%; argon is blown in the whole process of the converter, and the calming time from RH breaking of the ladle to casting of the casting machine is more than or equal to 30min; the continuous casting tundish adopts an ultra-low carbon covering agent and ultra-low carbon steel and high aluminum special covering slag, the liquid level fluctuation of the crystallizer adopts an automatic control mode, the liquid level fluctuation is less than or equal to +/-3 mm, and the casting is carried out at a constant drawing speed of more than or equal to 0.9 m/min.
3. The low cost electrical cold rolled steel strip as claimed in claim 1 wherein the hot continuous rolling is followed by a back end sparse cooling mode; the U-shaped coiling is used, the coiling temperature is 710 +/-15 ℃ within 40 meters of the head and the tail, and the middle part is 680 +/-15 ℃.
4. A low cost electrical cold rolled steel strip as claimed in claim 1 wherein said acid continuous rolling is: adding pickling corrosion inhibitors with the concentration of 1-2 per mill 2 hours in advance into a pickling tank, wherein the pickling speed is more than or equal to 100m/min; five stands are used for continuous rolling, and the total rolling reduction rate is 78.33-88.0%.
5. A low cost electrical cold rolled steel strip as claimed in claim 1, wherein said continuous annealing is: the annealing speed is less than or equal to 160m/min, the hydrogen content in the furnace is 3-7%, the oxygen content is less than or equal to 10ppm, and the furnace pressure is 100-400 Pa; the soaking temperature is 820-840 ℃, the slow cooling end point temperature is 640-660 ℃, the fast cooling end point temperature is 440-460 ℃, the aging end point temperature is 345-375 ℃, and the final cooling tapping temperature is less than or equal to 155 ℃.
6. The low cost electrical cold rolled steel strip as claimed in claim 1 wherein the flattening is: the working roll is a chrome-plated roll, the roughness of the roll is 2.0-2.8 mu m, the peak value number of the working roll is 90-100 cm, the concentration of the leveling liquid is 3%, the leveling elongation is 0.5%, and the surface roughness of the strip steel is 0.3-1.00 mu m.
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