CN115627408B - Production method of high-magnetic-induction unoriented silicon steel based on thin strip casting and rolling - Google Patents

Production method of high-magnetic-induction unoriented silicon steel based on thin strip casting and rolling Download PDF

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CN115627408B
CN115627408B CN202210830598.1A CN202210830598A CN115627408B CN 115627408 B CN115627408 B CN 115627408B CN 202210830598 A CN202210830598 A CN 202210830598A CN 115627408 B CN115627408 B CN 115627408B
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CN115627408A (en
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张凤泉
冯大军
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Shandong Meina Technology Co ltd
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Abstract

The invention provides a production method of high magnetic induction unoriented silicon steel based on thin strip casting rolling, comprising the following steps: putting the raw materials into a smelting furnace to smelt into molten steel, wherein the raw materials comprise the following components in percentage by mass: less than or equal to 0.0025% of C, 0.3-1.0% of Si, 0.3-1.0% of Mn, less than or equal to 0.05% of P, less than or equal to 0.0040% of S, less than or equal to 0.0040% of Al, less than or equal to 0.0020% of N, less than or equal to 0.0040% of Ti, and the balance of Fe element and unavoidable impurities; pouring the smelted molten steel from the ladle into a tundish; pouring molten steel into a molten pool of a double-roller thin strip continuous casting machine from the tundish and the transition ladle in sequence, solidifying the molten steel through a pair of counter-rotating crystallization rollers, and casting and rolling the solidified molten steel into strip steel; and naturally cooling the strip steel after the strip steel is rolled out, and carrying out online hot rolling, acid continuous rolling, annealing and coating treatment to form the magnetic induction non-oriented silicon steel. The method can solve the problems of complex production process, high rolling difficulty, high cost and the like in the existing preparation of the magnetic induction unoriented silicon steel strip.

Description

Production method of high-magnetic-induction unoriented silicon steel based on thin strip casting and rolling
Technical Field
The invention relates to the technical field of non-oriented silicon steel, in particular to a production method of high-magnetic induction non-oriented silicon steel based on thin strip casting and rolling.
Background
Silicon steel is also called electrical steel, is an indispensable important soft magnetic material in the electric, electronic and military industries, is a dominant product for energy conservation and emission reduction, plays a key role in various links of generation, conversion, transmission and use of electric energy, and is a national key encouragement steel-like product. The traditional process steelmaking is matched with complex and harsh multistage rolling and heat treatment processes, so that the silicon steel becomes one of the steel products with the longest production procedures and the largest energy consumption, and along with the increasing approaching of the target date of carbon neutralization and carbon peak in the steel industry, the steel industry is increasingly urgent to seek a production mode with low production cost, short process and low energy consumption.
The double-roller thin strip casting and rolling is a near-net forming manufacturing technology in the metallurgical field, which integrates smelting, continuous casting, rolling and other working procedures into a whole, and the process from molten steel to solid thin strip is completed in a short time. Conventional heating and hot rolling processes can be omitted, and the flow is shortened. Compared with the traditional process, the method has the advantages of reducing the energy consumption by more than 85%, reducing the carbon emission by more than 50%, reducing the production cost by more than 22%, reducing the maintenance cost by more than 61%, saving energy, protecting the environment and reducing the production cost.
Through searching published literature at home and abroad, related reports of chemical components, processes and performances of non-oriented silicon steel with high magnetic induction produced by adopting double-roller thin strip casting and rolling at present have some defects.
Chinese patent CN114293100a discloses an ultra-low iron loss non-oriented silicon steel and a method for producing the same; the molten steel comprises the following chemical components in percentage by weight: c is less than or equal to 0.005%, si:3.5 to 4.0 percent, mn:0.1 to 0.3 percent, als is less than or equal to 0.005 percent, P is less than or equal to 0.05 percent, S is less than or equal to 0.005 percent, cu is less than or equal to 0.08 percent, N is less than or equal to 0.003 percent, and Sn:0.04 to 0.08 percent, the content ratio of Mn to S in the steel satisfies Mn/S more than or equal to 50, and the balance is Fe and unavoidable impurities. This patent produces a silicon steel product having very excellent magnetic properties, but with a silicon content higher than 3.5%, cold rolling is very difficult.
Chinese patent CN104762551a discloses a method for manufacturing thin strip continuous casting high magnetic induction non-oriented silicon steel, comprising the steps of: (1) Smelting molten steel, and carrying out thin strip continuous casting to obtain a casting strip, wherein the superheat degree of the thin strip continuous casting is 30-55 ℃; (2) Directly carrying out hot rolling and coiling on the cast strip after cooling to obtain hot rolled strip steel, wherein the hot rolling reduction is 30-50%; (3) cold rolling the hot rolled strip steel with the rolling reduction less than or equal to 60 percent; and (4) annealing treatment to obtain a non-oriented silicon steel finished product plate. The invention produces a high magnetic induction non-oriented silicon steel product, which has continuous casting property affected by high aluminum content.
Chinese patent CN107058874a discloses a method for preparing high magnetic induction non-oriented silicon steel thin gauge product based on thin strip continuous casting. The method comprises the following steps of: (1) Smelting molten steel according to the set components, wherein the components in percentage by mass are as follows: c is less than or equal to 0.003%, si:2.0 to 3.5 percent, mn is less than or equal to 0.01 percent, al is less than or equal to 0.003 percent, P: 0.02-0.06%, S is less than or equal to 0.003%, and the balance is Fe and unavoidable impurities; (2) continuously casting the thin strip to obtain a cast strip; (3) hot rolling under inert atmosphere conditions; (4) Cooling to 650 ℃, coiling, removing the oxide scale thickness, and performing single-stage multi-pass cold rolling; (5) And continuously annealing the cold-rolled strip, coating an insulating layer, and drying to obtain a high-performance non-oriented silicon steel thin-gauge product. The invention improves the magnetic performance of the non-oriented silicon steel based on the thin strip continuous casting technology. The patent has high silicon content, is difficult to roll into a thin strip, and is likely to generate corrugated defects; and it is difficult to obtain high magnetic induction because of the high annealing temperature.
Chinese patent CN107164690a discloses a method for preparing {100} plane developed texture non-oriented silicon steel thin strip based on thin strip continuous casting. The components of the composition are as follows: c: 0.002-0.005%, si:2.2 to 3.5 percent, mn:0.2 to 0.3 percent of Al: less than 0.005%, P:0.08 to 0.2 percent, S: 0.002-0.005%, and the balance of Fe and unavoidable impurities. The patent contains P more than 0.08%, the rolling difficulty is extremely high, the breakage is easy to occur, the Al is required to be less than 0.005%, the magnetic performance of a finished product with the thickness of 0.35mm manufactured by thin strip casting and rolling and corresponding processes is excellent, the full circumferential magnetic induction B5000 is 1.73-1.81T, and the iron loss P1.5/50 is 1.8-2.8W/kg. The segregation amount of phosphorus element in extremely short time is limited due to high solidification speed during casting and rolling of the thin strip, so that the effect of phosphorus segregation in the conventional process is difficult to achieve.
Chinese patent CN108277335A discloses a method for reinforcing the recrystallization texture of thin strip cast non-oriented silicon steel {100 }. The invention obviously enhances {100} recrystallization texture by controlling the recrystallization and growth processes of the non-oriented silicon steel cold-rolled structure; however, the annealing process of the patent is complex, and the effect of obtaining high magnetic induction is not obvious.
In order to solve the problems, the invention provides a production method of high-magnetic-induction unoriented silicon steel based on thin strip casting rolling.
Disclosure of Invention
In view of the above problems, the invention aims to provide a production method of high magnetic induction unoriented silicon steel based on thin strip casting rolling, so as to solve the problems of complex production process, high rolling difficulty, high cost and the like in the existing preparation of magnetic induction unoriented silicon steel strip.
The invention provides a production method of high magnetic induction unoriented silicon steel based on thin strip casting rolling, comprising the following steps:
Putting raw materials into a smelting furnace to smelt into molten steel, wherein the raw materials comprise the following components in percentage by mass: less than or equal to 0.0025% of C, 0.3-1.0% of Si, 0.3-1.0% of Mn, less than or equal to 0.05% of P, less than or equal to 0.0040% of S, less than or equal to 0.0040% of Al, less than or equal to 0.0020% of N, less than or equal to 0.0040% of Ti, and the balance of Fe element and unavoidable impurities;
Pouring molten steel into a tundish from a ladle, wherein the pouring temperature of the tundish is 1550-1575 ℃;
Pouring the molten steel into a molten pool of a double-roller thin strip continuous casting machine from the tundish and the transition ladle in sequence, solidifying the molten steel through a pair of counter-rotating crystallization rollers, and casting and rolling the solidified molten steel into strip steel;
And naturally cooling the strip steel after being discharged from the roll, horizontally entering a four-roll hot rolling mill through a pinch roll to carry out continuous online hot rolling, cooling and coiling the strip steel into a coil through a water cooling system, and carrying out acid continuous rolling, annealing and coating treatment to form the magnetic induction non-oriented silicon steel.
Furthermore, it is preferable that the raw materials are smelted in a clean steel mode.
In addition, it is preferable that, in the process of solidifying and casting-rolling the molten steel into a strip steel,
The diameter of the counter-rotating crystallization roller is 800mm, the speed of casting and rolling the molten steel into the strip steel is v=60-90 m/min, the liquid level height h of the molten steel in the molten pool is 210-230 mm, the thickness delta of the strip steel is 1.2-2.4 mm, and the width k d of the strip steel is 1220-1240 mm.
In addition, the speed of casting and rolling the molten steel into the strip steel adopts the following formula:
v＝97-35×Si％
Wherein Si% represents the Si content in the components of the raw material.
In addition, the preferable proposal is that in the process of horizontally entering a four-roller hot rolling mill through a pinch roller to carry out continuous online hot rolling and cooling and coiling into coils through a water cooling system,
The rolling reduction is controlled to be 12-18%, the hot rolling start temperature is 980-1020 ℃, the hot rolling finish temperature is 930-980 ℃, and the coiling temperature is 680-720 ℃.
In addition, the preferable scheme is that in the process of acid continuous rolling treatment after the strip steel is coiled,
And (3) after the strip steel is coiled, carrying out acid washing treatment, and then carrying out cold rolling treatment, wherein the thickness of the strip steel is 0.50mm, and the total rolling reduction is 58-80%.
In addition, the preferable scheme is that in the process of annealing and coating the strip steel after the acid continuous rolling treatment,
And (3) annealing the finished product in an N 2+H2 mixed atmosphere, wherein the soaking temperature is 890-930 ℃, the soaking heat preservation time is 100-130 s, and the hydrogen volume ratio in the N 2+H2 mixed gas is controlled to be 50-80%.
In addition, in the annealing of the strip steel after the acid continuous rolling treatment, the soaking temperature is preferably set by adopting the following formula: t (°c) =580+256× (si+mn);
Wherein Si+Mn represents the total amount of Si and Mn in the components of the raw material, and the total amount of Si and Mn in the components of the raw material is: si+Mn is more than or equal to 1.24% and less than or equal to 1.34%.
In addition, in the annealing of the strip steel after the acid continuous rolling treatment, the soaking and heat preserving time is adjusted by adopting the following formula: t (S) =30+0.5× (c+s+n) +35× (Al/27+ti/48);
wherein c+s+n represents the total amount of C, S, N of the ingredients of the raw material, and C, S, N of the ingredients of the raw material is: C+S+N is less than or equal to 80ppm;
Al/27+Ti/48 represents the molar mass of the residual element in the composition of the raw material, which is: al/27+Ti/48 is less than or equal to 1.8.
In addition, in the annealing of the strip steel after the acid continuous rolling treatment, the following formula is adopted to adjust the hydrogen volume ratio in the N 2+H2 mixed gas: f (H 2) =32+51×si%;
Wherein Si% represents the Si content in the components of the raw material.
According to the technical scheme, the production method of the high magnetic induction non-oriented silicon steel based on strip casting provided by the invention is characterized in that the strip steel is subjected to cold rolling heat treatment, acid continuous rolling, annealing and coating treatment by adopting a double-roller strip casting technology by controlling the total amount of Si+Mn and reducing components of C, S, N, al, ti and other residual elements, so that the magnetic induction non-oriented silicon steel with excellent magnetic performance is obtained, and the problems of complex production process, high rolling difficulty, high cost and the like in the existing preparation of the magnetic induction non-oriented silicon steel strip are solved.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:
Fig. 1 is a schematic flow chart of a production method of high magnetic induction unoriented silicon steel based on thin strip casting rolling in an embodiment of the invention.
The same reference numerals will be used throughout the drawings to refer to similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Aiming at the problems of complex production process, high rolling difficulty, high cost and the like in the prior preparation of the magnetic induction non-oriented silicon steel strip, the invention provides a production method of the high magnetic induction non-oriented silicon steel strip based on thin strip casting.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the production method of the high magnetic induction non-oriented silicon steel based on thin strip casting, fig. 1 shows the flow of the production method of the high magnetic induction non-oriented silicon steel based on thin strip casting.
As shown in fig. 1, the method for producing high magnetic induction unoriented silicon steel based on thin strip casting rolling provided by the invention comprises the following steps: s110: putting raw materials into a smelting furnace to smelt into molten steel, wherein the raw materials comprise the following components in percentage by mass: less than or equal to 0.0025% of C, 0.3-1.0% of Si, 0.3-1.0% of Mn, less than or equal to 0.05% of P, less than or equal to 0.0040% of S, less than or equal to 0.0040% of Al, less than or equal to 0.0020% of N, less than or equal to 0.0040% of Ti, and the balance of Fe element and unavoidable impurities;
S120: pouring molten steel into a tundish from a ladle, wherein the pouring temperature of the tundish is 1550-1575 ℃;
s130: pouring the molten steel into a molten pool of a double-roller thin strip continuous casting machine from the tundish and the transition ladle in sequence, solidifying the molten steel through a pair of counter-rotating crystallization rollers, and casting and rolling the solidified molten steel into strip steel;
s140: and naturally cooling the strip steel after being discharged from the roll, horizontally entering a four-roll hot rolling mill through a pinch roll to carry out continuous online hot rolling, cooling and coiling the strip steel into a coil through a water cooling system, and carrying out acid continuous rolling, annealing and coating treatment to form the magnetic induction non-oriented silicon steel.
In the embodiment of the invention, the composition design of controlling the total amount of Si+Mn and reducing C, S, N, al, ti and other residual elements is adopted, a double-roller thin strip continuous casting technology is adopted, and a cold rolling heat treatment process system is combined, so that the finished product structure is effectively regulated and controlled, and the high-magnetic induction non-oriented silicon steel is produced and used for manufacturing the high-efficiency motor.
In the embodiment of the invention, the high magnetic induction non-oriented silicon steel is produced through the steps of smelting, cast rolling, hot rolling, acid continuous rolling, finished product annealing, coating and the like.
Step S110, smelting: smelting according to a clean steel mode, wherein the molten steel comprises the following elements in percentage by mass: c: less than or equal to 0.0025 percent, si:0.3 to 1.0 percent, mn:0.3 to 1.0 percent, P: less than or equal to 0.05 percent, S: less than or equal to 0.0040 percent, al: less than or equal to 0.0040 percent, N: less than or equal to 0.0020 percent, ti: less than or equal to 0.0040 percent, and the balance of Fe and unavoidable impurities.
Wherein, the total amount of Si and Mn is controlled by: si+Mn is less than or equal to 1.24 and less than or equal to 1.34. The method aims to keep the alpha and gamma two-phase region of the strip steel relatively stable, and is beneficial to the preparation of hot rolling and finished product annealing processes. The total amount of harmful elements is adopted to control: C+S+N is less than or equal to 80ppm. The purpose is to obtain a high magnetic induction of the finished product. The molar mass of the residual elements is controlled with emphasis: al/27+Ti/48 is less than or equal to 1.8. The purpose is to reduce oxide and nitride inclusion in the strip steel as much as possible, so that the magnetic performance of the finished product is better.
In the embodiment of the invention, the adoption of the component proportion has three reasons, namely, a low-silicon aluminum-free component system is selected for obtaining high performance of a finished product; second, to maintain stability of continuous casting and hot rolling, si, mn total control is used: si+Mn is less than or equal to 1.24 and less than or equal to 1.34; al is less than or equal to 0.0040 percent to increase the castability, and Ti is less than or equal to 0.0040 percent to reduce carbide and nitride inclusion; third, in order to obtain high magnetic induction of the finished product, the total amount of residual elements is strictly controlled, including C+S+N is less than or equal to 80ppm and Al/27+Ti/48 is less than or equal to 1.8.
In the steps S120 and S130, firstly, molten steel is poured into a tundish from a ladle, the pouring temperature of the tundish is 1550-1575 ℃, then molten steel is poured into a molten pool of a double-roller thin-strip continuous casting machine through the tundish and the transition ladle in sequence, the molten steel is rapidly solidified through a pair of crystallization rollers (with the diameter of R=800 mm) rotating in opposite directions, then the molten steel is cast into a strip, the casting speed v=60-90 m/min of the strip steel is required to be controlled, the liquid level h=210-230 mm of the molten steel in the molten pool, the thickness delta=1.2-2.4 mm and the width k d -1240 mm of the strip steel are controlled. Wherein the casting speed of the strip steel in casting and rolling is adjusted according to v=97-35×Si%.
In the embodiment of the invention, the pouring box pouring temperature is set to 1520-1550 ℃, because the excessively high pouring temperature leads to increased energy consumption and maintenance cost, and the excessively low pouring temperature is not beneficial to continuous stable pouring and even can cause intermittent pouring; the casting speed of the strip steel is set to be v=60-85 m/min, and the casting speed of the strip steel is controlled according to v=60+10/Si%, because the viscosity of molten steel becomes smaller due to the increase of silicon content, thereby being beneficial to the speed-up casting; however, the increase of the silicon content causes insufficient heat conduction capability, which is unfavorable for rapid continuous casting.
In an embodiment of the invention, hot rolling: naturally cooling the cast strip after being taken out of the roll, horizontally entering a four-roll hot rolling mill through a pinch roll to carry out continuous online hot rolling, cooling and coiling a hot rolled plate into a coil through a water cooling system, and automatically shearing according to the coil setting within the range of 20-30 tons; the reduction of the hot rolling is controlled to be 12-18%, which is beneficial to obtaining better hot rolled plate quality; the hot rolling temperature is 980-1020 ℃, the final rolling temperature is 930-980 ℃, and the coiling temperature is 680-720 ℃; is set according to the requirement of being favorable for obtaining the favorable texture of the high-magnetic-induction non-oriented silicon steel.
Acid continuous rolling: after pickling, the hot rolled coil is cold rolled to a finished product thickness of 0.50mm, and the total reduction rate is controlled to be 58-80%, which is determined by the thickness of the raw material and the thickness of the finished product.
And (3) annealing and coating a finished product: and (3) annealing the finished product in an N 2+H2 mixed atmosphere, wherein the soaking temperature is 890-930 ℃, the soaking heat preservation time is 100-130 s, and the hydrogen volume ratio in the N 2+H2 mixed gas is controlled to be 50-80%.
In the finish annealing, the soaking temperature is set according to the formula T (C) =580+256× (si+mn), the soaking time is adjusted according to the formula T (S) =30+0.5× (c+s+n) +35× (Al/27+ti/48), and the hydrogen volume ratio in the N 2+H2 mixture is adjusted according to the formula f (H 2) =32+51×si%.
In the embodiment of the invention, the soaking temperature is set according to the formula T (DEG C) =580+256× (Si+Mn), because the total (Si+Mn) can keep the alpha+gamma two-phase region of the strip steel relatively stable, and the annealing in the alpha+gamma two-phase region is avoided, so that the grain refinement is caused, and the magnetic performance of the finished product is influenced. The soaking time is adjusted by the formula t (S) =30+0.5× (c+s+n) +35× (Al/27+ti/48), because an increase in the total amount of (c+s+n) and (Al/27+ti/48) may cause deterioration of magnetic properties, and thus an increase in the soaking time is required to improve magnetic properties. The hydrogen volume ratio in the N 2+H2 mixture was adjusted according to the formula f (H 2) =32+51×si%, because an increase in Si% requires more hydrogen to improve magnetic properties and improve surface quality.
The magnetic properties of the high-magnetic-induction non-oriented silicon steel obtained by the method are as follows: p 1.5/50 is 4.5-6.0W/kg, and magnetic induction B 5000 is 1.74-1.82T.
In order to further explain the technical process of the production method of the high-magnetic-induction unoriented silicon steel based on thin strip casting, the production method of the high-magnetic-induction unoriented silicon steel based on thin strip casting in the embodiment of the invention comprises the following technical principle: pouring molten steel into a tundish from a ladle after smelting and checking that the components are qualified, and detecting the temperature of the tundish in real time. During casting, molten steel is poured into the transition ladle from the tundish, and flows vertically downwards from the nozzle into a molten pool surrounded by the two counter-rotating casting rolls and the side sealing plates. The cooling water is introduced into the casting rolls, so that the molten steel is quenched and solidified, and a solidified layer is formed around the casting rolls and subjected to relative rolling by the casting rolls, thereby forming a strip cast. The thickness of the strip steel is only 1-3mm because of the small roll gap. After the strip steel is rolled out, the strip steel enters a hot rolling mill through a pinch roll, is cooled through a water cooling device after final rolling, enters a coiling machine through the pinch roll and a steering roll, is sheared through an automatic flying shear after the coiling weight requirement is met, and then the subsequent strip steel automatically enters the next coiling machine.
In the embodiments of the present invention, the high magnetic induction non-oriented silicon steel is produced according to the following steps:
(1) Smelting: smelting according to a clean steel mode, wherein the molten steel comprises the following elements in percentage by weight: c: less than or equal to 0.0025 percent, si:0.3 to 1.0 percent, mn:0.3 to 1.0 percent, P: less than or equal to 0.05 percent, S: less than or equal to 0.0040 percent, al: less than or equal to 0.0040 percent, N: less than or equal to 0.0020 percent, ti: less than or equal to 0.0040 percent, and the balance of Fe and unavoidable impurities;
(2) Casting and rolling: firstly, pouring molten steel into a tundish from a ladle, pouring the molten steel into a molten pool of a double-roller thin-strip continuous casting machine at 1550-1575 ℃ through the tundish and the transition ladle in sequence, rapidly solidifying the molten steel through a pair of counter-rotating crystallization rollers (diameter R=800 mm), casting and rolling the molten steel into a strip, wherein the casting speed v=60-90 m/min of the strip steel is required to be controlled, the liquid level h=210-230 mm of the molten steel in the molten pool, the thickness delta=1.2-2.4 mm of the strip steel is required to be controlled, and the width k d =1220-1240 mm of the strip steel is required to be controlled;
(3) And (3) hot rolling: naturally cooling the cast strip after being taken out of the roll, horizontally entering a four-roll hot rolling mill through a pinch roll to carry out continuous online hot rolling, cooling and coiling a hot rolled plate into a coil through a water cooling system, and automatically shearing according to the coil setting within the range of 20-30 tons; controlling the rolling reduction of 12-18%, the hot rolling start temperature of 980-1020 ℃, the final rolling temperature of 930-980 ℃ and the coiling temperature of 680-720 ℃;
(4) Acid continuous rolling: after pickling, cold rolling the hot rolled coil to a finished product thickness of 0.50mm, and controlling the total reduction ratio to be 58-80%;
(5) And (3) annealing and coating a finished product: and (3) annealing the finished product in an N 2+H2 mixed atmosphere, wherein the soaking temperature is 890-930 ℃, the soaking heat preservation time is 100-130 s, and the hydrogen volume ratio in the N 2+H2 mixed gas is controlled to be 50-80%.
According to the above method for producing a thin strip, the present invention is further illustrated according to the examples of the following tables. Among these, the following is a list of the components, processes and test properties of each of the examples and comparative examples of the present invention.
TABLE 1 list of ingredients for each example and comparative example of the present invention
Description: the values in Table 1 show that C+S+N is 80ppm or less and Al/27+Ti/48 is 1.8 or less, which do not satisfy the requirements of the examples of the present invention, and thus are all comparative examples equivalent to the main alloying element (Si+Mn) thereof.
TABLE 2 list of the main process parameters (1) for the examples and comparative examples of the invention
Description: 1) The molten steel solidification starting temperature calculation formula: tliquid=1537- (88 [ C ] +8[ Si ] +5[ Mn ] +30[ P ] +25[ S ] +5[ Cu ] +4[ Ni ] +2[ Mo ] +2[V ] +1.5[ Cr ]; 2) degree of superheat=tundish casting temperature-molten steel solidification starting temperature.
Table 2 shows a list of the main process parameters (2) for the examples and comparative examples of the invention
TABLE 3 Performance test results list for various examples and comparative examples of the present invention
As can be seen from table 3, it can be seen from table 3 that the magnetic properties of the examples are better than those of the corresponding comparative examples, i.e., the core loss is low and the magnetic induction is high.
From the simulation results of the Y2-132M-4 motor software, the motor efficiency of the embodiment is 0.7-0.11% higher than that of the corresponding comparative example, and the starting torque multiple of the embodiment is 0.03-0.06 higher than that of the corresponding comparative example.
According to the production method of the high magnetic induction non-oriented silicon steel based on strip casting and rolling provided by the invention, the total amount of Si+Mn is controlled, components of C, S, N, al, ti and other residual elements are reduced, and the strip steel is subjected to cold rolling heat treatment, acid continuous rolling, annealing and coating treatment by adopting a double-roller strip casting technology, so that the magnetic induction non-oriented silicon steel with excellent magnetic performance is obtained. By adopting the production method, the addition of alloy elements is less, which is beneficial to reducing the cost; the process flow is short, which is beneficial to energy conservation and consumption reduction; the finished product has high magnetic induction, which is beneficial to improving the efficiency and the starting torque of the motor; thereby solving the problems of complex production process, large rolling difficulty, high cost and the like in the prior preparation of the magnetic induction unoriented silicon steel strip.
The production method of the high magnetic induction non-oriented silicon steel based on thin strip casting according to the present invention is described above by way of example with reference to the accompanying drawings. It will be appreciated by those skilled in the art that various modifications may be made to the method of producing high magnetic induction unoriented silicon steel based on thin strip casting as set forth in the present invention described above without departing from the context of the present invention. Accordingly, the scope of the invention should be determined from the following claims.

Claims (4)

1. The production method of the high-magnetic-induction unoriented silicon steel based on thin strip casting rolling is characterized by comprising the following steps of:
Putting raw materials into a smelting furnace to smelt into molten steel, wherein the raw materials comprise the following components in percentage by mass: less than or equal to 0.0025% of C, 0.3-1.0% of Si, 0.3-1.0% of Mn, less than or equal to 0.05% of P, less than or equal to 0.0040% of S, less than or equal to 0.0040% of Al, less than or equal to 0.0020% of N, less than or equal to 0.0040% of Ti, and the balance of Fe element and unavoidable impurities;
Pouring molten steel into a tundish from a ladle, wherein the pouring temperature of the tundish is 1550-1575 ℃;
Pouring the molten steel into a molten pool of a double-roller thin strip continuous casting machine from the tundish and the transition ladle in sequence, solidifying the molten steel through a pair of counter-rotating crystallization rollers, and casting and rolling the solidified molten steel into strip steel;
Naturally cooling the strip steel after being discharged from a roll, horizontally entering a four-roll hot rolling mill through a pinch roll to carry out continuous online hot rolling, cooling and coiling the strip steel into a coil through a water cooling system, and carrying out acid continuous rolling, annealing and coating treatment to form magnetic induction non-oriented silicon steel;
in the process of solidifying and casting the molten steel into strip steel,
The diameter of the counter-rotating crystallization roller is 800mm, the speed of casting and rolling the molten steel into strip steel is v=60-90 m/min, the liquid level height h of the molten steel in the molten pool is 210-230 mm, the thickness delta of the strip steel is 1.2-2.4 mm, and the width k d of the strip steel is 1220-1240 mm;
The speed of casting and rolling the molten steel into the strip steel adopts the following formula:
v=97-35×Si%
Wherein Si% represents the Si content in the components of the raw material;
in annealing the strip steel after the acid continuous rolling treatment, the soaking temperature is set by adopting the following formula: t (°c) =580+256× (si+mn);
wherein Si+Mn represents the total amount of Si and Mn in the components of the raw material, and the total amount of Si and Mn in the components of the raw material is: si+Mn is more than or equal to 1.24% and less than or equal to 1.34%;
Continuously and online hot-rolling the hot-rolled coil in a four-roller hot rolling mill horizontally through a pinch roller, wherein the hot-rolling reduction is controlled to be 12-18%, the hot-rolling start temperature is 980-1020 ℃, the hot-rolling finish temperature is 930-980 ℃ and the coiling temperature is 680-720 ℃ in the process of cooling, coiling and coiling the hot-rolled coil through a water cooling system;
In the process of annealing and coating the strip steel subjected to acid continuous rolling treatment, finished product annealing is carried out in an N 2+H2 mixed atmosphere, the soaking temperature is 890-930 ℃, the soaking heat preservation time is 100-130 s, and the hydrogen volume ratio in the N 2+H2 mixed gas is controlled to be 50-80%;
in the annealing of the strip steel after the acid continuous rolling treatment, the soaking and heat preserving time is adjusted by adopting the following formula: t (S) =30+0.5× (c+s+n) +35× (Al/27+ti/48);
wherein c+s+n represents the total amount of C, S, N of the ingredients of the raw material, and C, S, N of the ingredients of the raw material is: C+S+N is less than or equal to 80ppm;
Al/27+Ti/48 represents the amount of residual elements in the composition of the raw material: al/27+Ti/48 is less than or equal to 1.8 ppm.
2. The method for producing high magnetic induction unoriented silicon steel based on thin strip casting according to claim 1, characterized in that the raw material is smelted in a clean steel mode.
3. The method for producing a high magnetic induction non-oriented silicon steel based on thin strip casting as claimed in claim 1, wherein, in the acid continuous rolling treatment after the strip is coiled,
And (3) after the strip steel is coiled, carrying out acid washing treatment, and then carrying out cold rolling treatment, wherein the thickness of the strip steel is 0.50mm, and the total rolling reduction is 58-80%.
4. The method for producing high magnetic induction unoriented silicon steel based on thin strip casting as claimed in claim 1, wherein in annealing the strip steel after acid continuous rolling treatment, the volume ratio of hydrogen in the N 2+H2 mixed gas is adjusted by adopting the following formula: f (H 2) =32+51×si%;
Wherein Si% represents the Si content in the components of the raw material.
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