CN111733362A - Silicon steel plate easy to pickle and production method thereof - Google Patents
Silicon steel plate easy to pickle and production method thereof Download PDFInfo
- Publication number
- CN111733362A CN111733362A CN202010602167.0A CN202010602167A CN111733362A CN 111733362 A CN111733362 A CN 111733362A CN 202010602167 A CN202010602167 A CN 202010602167A CN 111733362 A CN111733362 A CN 111733362A
- Authority
- CN
- China
- Prior art keywords
- silicon steel
- equal
- rolling
- less
- controlled
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
-
- 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%
-
- 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
-
- 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
Abstract
The invention discloses an easily pickled silicon steel plate and a production method thereof, belonging to the technical field of metallurgy. The invention relates to an easy-pickling silicon steel plate, which comprises the following components in percentage by weight: c is less than or equal to 0.005%, Si: 2.0% -3.2%, Mn: 0.1% -0.35%, Als: 0.5 to 1.0 percent of the total weight of the alloy, less than or equal to 0.005 percent of S, less than or equal to 0.04 percent of P, less than or equal to 0.005 percent of N, less than or equal to 0.005 percent of Ti, and the balance of Fe and inevitable impurities, wherein the content of Mn and S meets the condition that Mn/S is more than or equal to 65, and the preparation process flow comprises the following steps: the method comprises the steps of molten steel smelting, continuous casting, hot rolling, laminar cooling, coiling, cold rolling, continuous annealing and finishing, wherein the time for external refining in the molten steel smelting is controlled to be 37-40 min, and the drawing speed in the continuous casting is controlled to be 1.1-1.3 m/min. The invention aims to solve the problem of large thickness of the iron scale on the surface of the silicon steel in the prior art, and the silicon steel plate with thin iron scale and easy pickling is produced by combining reasonable steel-making, hot rolling and cold rolling processes through proper elemental composition design of Si, Mn, Al and the like.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to an easily pickled silicon steel plate and a production method thereof.
Background
Silicon steel is an important electromagnetic material of motor products, and in recent years, along with the development of the field of motors for household appliances and new energy products, the requirements on the performance of the motors are higher and higher. The motor is mature in the field of new energy automobiles, so that the problems caused by air pollution are effectively reduced, and the traffic pressure is relieved; meanwhile, with the further improvement of the quality of life of human beings, household appliances must be more energy-saving, environment-friendly, healthy and comfortable. Therefore, the motor must be more efficient, and the requirements for silicon steel products are mainly reflected in lower iron loss, higher magnetic induction intensity, reasonable coating effect, excellent stacking coefficient and the like. The process of the silicon steel which is not pickled seriously affects the product performance after cold rolling, finally causes the performance indexes of the motor to be reduced, and seriously affects the healthy development of the whole industry, so the invention of the silicon steel product which is easy to pickle cannot be waited.
At present, the industry generally considers that the underpickling is mainly caused by thicker iron scale, and the main component of the iron scale is generally Fe at the outermost layer2O3Middle layer Fe3O4And innermost FeO, wherein Fe3O4Most dense, Fe2O3Secondly, FeO is the most loose; FeO is most susceptible to reductive decomposition by acid, Fe3O4Second, Fe2O3Most difficult to be reduced and decomposed by acid. Generally, the thinner the thickness of the iron scale, the higher the FeO proportion in the iron scale structure, and the more beneficial to the improvement of the pickling efficiency and the pickling surface quality. Different production processes have different oxide layer thicknesses, and the iron oxide scales on the surface are difficult to treat due to the application of partial new technologies such as rapid temperature rise, high-temperature short-time heat preservation and the like at present. When the surface of the strip steel has residuesWhen the iron scale is rolled into a matrix in a cold rolling process, the iron scale is not beneficial to product coating after high-temperature annealing, the stacking coefficient is reduced, even the electromagnetic performance of a silicon steel product is reduced, and the motor performance is seriously influenced.
The current method for controlling the iron oxide loss thickness mainly focuses on hot rolling and acid pickling processes, and the hot rolling process mainly controls the heating temperature and time of a plate blank, rough rolling dephosphorization, finish rolling dephosphorization, cooling and other process parameters; the pickling process mainly comprises the steps of prolonging the pickling time, increasing the acid liquor concentration, increasing the shot blasting process and the like.
Through search, a large number of patents have been published on steel plates for making chain pieces, such as chinese patent application No.: 2012101721253, the name of invention creation is: the application discloses a preparation method of an easily pickled steel plate, which comprises the following steps: smelting molten steel and continuously casting into a plate blank; descaling by using high-pressure water, carrying out rough rolling on the descaled plate blank, then carrying out finish rolling, cooling to 500-550 ℃ after finish rolling, and obtaining the hot-rolled easy-pickling steel grade with the FeO content of more than 25% at a cooling rate of 5-10 ℃/min after coiling; and (3) after finish rolling, cooling to 650-700 ℃, coiling, wherein the cooling rate after coiling is 1-5 ℃/min, and the obtained cold-rolled easy-acid-pickling steel grade with uniform structure and iron scale FeO content lower than 10%.
Also as in chinese patent application No.: 2012104351012, the name of invention creation is: the application discloses an easy-pickling steel and a production method thereof, and the easy-pickling steel comprises the following chemical components in percentage by weight: c: 0.068-0.097%, Si: less than or equal to 0.03 percent, Mn: 0.27-0.60%, P: less than or equal to 0.015 percent, S: less than or equal to 0.010 percent, Als: 0.028-0.050%, N: less than or equal to 0.005 percent; the production steps are as follows: desulfurizing molten iron; smelting and continuously casting into a blank; heating a casting blank; rough rolling; fine rolling; laminar cooling; coiling; and (5) standby. In the scheme, because the iron oxide scale on the surface of the steel plate is thin and the FeO content in the iron scale is higher, the excessive thickness of the iron scale at the edge part and the Fe content are avoided2O3Generating to obtain an iron scale structure easy to be pickled; due to the adoption of the method of low-temperature short-time heating and low-temperature rolling, the method avoidsThe defects of large energy consumption, serious oxidation burning loss, low yield, serious roller abrasion and high oxidation defect rate caused by traditional high-temperature long-time heating and rolling are overcome, and the convexity of the control plate is less than or equal to 40 mu m, so that the uniformity of the scale on the plate surface is favorably improved.
The two schemes both give out the adjustment parameters of the related hot rolling process, but mainly relate to that the steel grade is plain carbon steel, and the guidance significance to high-quality silicon steel products is not great.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to solve the problems that the thickness of iron scale on the surface of silicon steel is large and the pickling is easy to occur in the prior art, and provides an easily pickled silicon steel plate and a production method thereof.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to an easy-pickling silicon steel plate, which comprises the following components in percentage by weight: c is less than or equal to 0.005%, Si: 2.0% -3.2%, Mn: 0.1% -0.35%, Als: 0.5 to 1.0 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.04 percent of P, less than or equal to 0.005 percent of N, less than or equal to 0.005 percent of Ti, and the balance of Fe and inevitable impurities, wherein the content of Mn and S satisfies that the content of Mn/S is more than or equal to 65.
The invention provides an easy-pickling silicon steel plate, which comprises the following components:
c: c increases the iron loss of the silicon steel product, so the content of C is controlled to be below 0.005 percent and below 0.003 percent as much as possible, and the magnetic performance of the silicon steel product is further optimized.
Si: si is the most important alloy element influencing the magnetic performance of the silicon steel, the iron loss can be reduced by the existence of the Si, but the magnetic induction can be reduced, the brittleness and the hardness of the silicon steel finished product can be increased, and the cold rolling processability is poor, so the Si content is controlled within the range of 2.0-3.2 percent.
Mn: mn element can inhibit hot brittleness in the heating process, reduce iron loss, form MnS and reduce S dissolved in steel, the aim can be achieved when the Mn content is more than 0.1%, and the economy is reduced due to excessively high Mn content, so that the Mn content is controlled to be 0.1-0.25%, and because the content of silicon is higher and belongs to high-quality silicon steel, Mn/S is controlled to be more than or equal to 65, and the iron loss of the silicon steel can be well reduced.
S: the increase of the S element obviously increases the iron loss, and easily influences the hot brittleness performance of the silicon steel, so that the S content is controlled to be less than or equal to 0.005 percent to meet the requirement.
P: in silicon steel, P element has the function of grain boundary segregation, so that embrittlement easily occurs and the bending frequency of a product is seriously deteriorated, so that the content of P is not easily too high and needs to be controlled below 0.04%.
And Als: al is also one of the most important alloy elements for the magnetic performance of silicon steel, and the influence degree of the Al element on the brittleness of the steel is smaller than that of Si. In addition, the existence of Al can improve the components in the silicon steel which are beneficial to the magnetic induction, but in consideration of the processing problem, the content of Als is controlled to be 0.5-1.0%.
N: since the N element increases the iron loss of silicon steel as the S element, the N content should be controlled to 0.005% or less.
Ti: from the viewpoint of steel-making cost and workability, the Ti content in the silicon steel should be controlled to 0.005% or less.
The invention relates to a preparation method of an easily pickled silicon steel plate, which comprises the following preparation process flows: the method comprises the steps of molten steel smelting, continuous casting, hot rolling, laminar cooling, coiling, cold rolling, continuous annealing and finishing, wherein the time for external refining in the molten steel smelting is controlled to be 37-40 min, and the drawing speed in the continuous casting is controlled to be 1.1-1.3 m/min.
As a further improvement of the invention, the molten steel with the chemical components is continuously cast into a continuous casting billet with the thickness of 50 mm-90 mm, and electromagnetic stirring is used in the continuous casting process.
As a further improvement of the invention, the continuous casting billet is directly fed into a heating furnace without being cooled, the temperature of the heating furnace is controlled to be 1050-1200 ℃, and the total time of heating and heat preservation in the heating furnace is less than 3 h.
As a further improvement of the invention, the temperature of rough rolling and final rolling in the hot rolling procedure is controlled to be 950-980 ℃, the total pressure reduction of rough rolling is more than or equal to 80%, high-pressure dephosphorization is more than or equal to 3 times, and the water pressure of dephosphorization is more than or equal to 20 MPa.
As a further improvement of the invention, the start rolling temperature of finish rolling is controlled to be 930-980 ℃, the finish rolling temperature of finish rolling is controlled to be 860-920 ℃, the total rolling reduction of finish rolling is more than or equal to 90%, and the convexity of the silicon steel strip is less than or equal to 40 μm after finish rolling.
As a further improvement of the invention, the laminar cooling speed is more than or equal to 5 ℃/S, and the final temperature of the silicon steel strip is controlled to be 520-600 ℃.
As a further improvement of the invention, the coiling temperature is controlled at 520-600 ℃, and the silicon steel plate strip which is easy to be pickled and has the thickness of the iron scale less than or equal to 10 mu m is obtained by naturally cooling to the normal temperature.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the invention relates to an easy-pickling silicon steel plate, which comprises the following components in percentage by weight: : c is less than or equal to 0.005%, Si: 2.0% -3.2%, Mn: 0.1% -0.35%, Als: 0.5 to 1.0 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.04 percent of P, less than or equal to 0.005 percent of N, less than or equal to 0.005 percent of Ti, and the balance of Fe and inevitable impurities, wherein the content of Mn and S meets the requirement that Mn/S is more than or equal to 65; the silicon content of the easy-pickling silicon steel plate is high, the proper contents of Si, Mn, Al and other elements are added, and the contents of Mn and S are designed to meet the condition that Mn/S is more than or equal to 65, so that the easy-pickling silicon steel hot-rolled plate strip with the thickness of the iron scale less than or equal to 10 mu m can be obtained in the subsequent hot rolling process.
(2) According to the preparation method of the easy-pickling silicon steel plate, the time of external refining in the molten steel smelting process is controlled to be 37-40 min, the pulling speed in the continuous casting process is controlled to be 1.1-1.3 m/min, the time of external refining is reduced to 37-40 min from the original 42-47 min, and meanwhile, the pulling speed of continuous casting is improved to be 1.1-1.3 m/min from the original 0.9-1.0 m/min, so that the production speed of a casting blank is improved, the overall production rhythm is accelerated, and preparation is made for shortening the heating and heat preservation time in a heating furnace in the subsequent rolling process.
(3) According to the preparation method of the easy-pickling silicon steel plate, the continuous casting blank is directly fed into the heating furnace without being cooled, the temperature of the heating furnace is controlled to be 1050-1200 ℃, and the total heating and heat preservation time in the heating furnace is less than 3 hours. At present, the time of a conventional continuous casting billet in a heating furnace is 3-4 h, the total heating and heat preservation time of the continuous casting billet in a small heating furnace is less than 3h, the heating and heat preservation time of the continuous casting billet in the heating furnace is shortened, the surface oxidation degree of the continuous casting billet can be effectively reduced, the thickness of oxide scales on the surface of the continuous casting billet is further reduced, and energy and cost can be saved.
(4) According to the preparation method of the silicon steel plate easy to acid wash, the rough rolling and final rolling temperature in the hot rolling procedure is controlled to be 950-980 ℃, and as the Si content of the silicon steel strip is required to be 2.0%, secondary oxidation behaviors on the surface of the silicon steel strip can be effectively relieved in the rough rolling and finish rolling processes along with the increase of the Si content, but when the temperature of the rough rolling and the finish rolling is higher than 1000 ℃, the relieving effect is gradually weakened. Experimental research shows that when the rough rolling temperature exceeds 980 ℃, the surface oxidation degree of the silicon steel strip is increased, the inner layer of the silicon steel strip is oxidized to form ferrous silicate, and the ferrous silicate cannot be removed by a mechanical means on the outer surface, so that the rough rolling finishing temperature is controlled to be 950-980 ℃, more favorable tissue structures can be obtained in the rough rolling process, and the strong inheritance exists among the working procedures, namely the favorable tissue structures formed by rough rolling can be inherited to finish rolling. Meanwhile, the temperature of 700-900 ℃ is a sensitive area of the oxidation behavior of the steel, so that the thickness of the oxide layer on the surface of the silicon steel strip can be effectively reduced by avoiding the temperature area. Because the rough rolling final rolling temperature is controlled by the rolling speed, the lower the rolling speed is, the lower the rough rolling control temperature is, and the heating and heat preservation time in the heating furnace can be properly shortened and matched with each other to form a smooth production line.
(5) According to the preparation method of the easy-pickling silicon steel plate, the coiling temperature is controlled to be 520-600 ℃, the easy-pickling silicon steel plate is naturally cooled to the normal temperature, the easy-pickling silicon steel plate strip with the thickness of the iron scale being less than or equal to 10 microns is obtained, the oxidation stage is avoided by adopting low-temperature coiling, the oxidation behavior in the coiling and cooling process of the steel strip can be effectively reduced, and the thickness of the oxide layer on the surface of the silicon steel plate strip is reduced. Meanwhile, the finish rolling temperature in the finish rolling process is generally required to be more than 860 ℃, and the silicon steel strip is rapidly cooled to below 600 ℃ from a high temperature of more than 860 ℃, so that the favorable organization structure in the silicon steel strip can be protected to be fully inherited, and the quality of subsequent silicon steel products is improved.
Drawings
FIG. 1 is a graph showing the thickness of an oxide layer on the surface of a hot-rolled strip steel in example 1;
FIG. 2 is the surface quality of the acid-washed hot rolled strip steel in example 1;
FIG. 3 is a graph showing the thickness of an oxide layer on the surface of a hot-rolled strip steel in example 2;
FIG. 4 is the surface quality of the hot rolled strip steel after acid pickling in example 2;
FIG. 5 is a graph showing the thickness of an oxide layer on the surface of a hot-rolled strip steel in example 3;
FIG. 6 shows the surface quality of the hot rolled strip steel after acid pickling in example 3;
FIG. 7 shows the thickness of the oxide layer on the surface of the strip steel in comparative example 1;
FIG. 8 shows the surface quality of steel strip in comparative example 1 after pickling.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
The easy-pickling silicon steel plate comprises the following components in percentage by weight: c: 0.005%, Si: 2.0%, Mn: 0.35%, Als: 0.5%, S: 0.005%, P: 0.04%, N: 0.005%, Ti: 0.005 percent and the balance of Fe and inevitable impurities, wherein the content of Mn and S satisfies that Mn/S is more than or equal to 65. Because the silicon content of the easy-pickling silicon steel plate is high, the silicon content is properly added, the content of Si, Mn, Al and other elements is designed, and the content of Mn and S meets the requirement that Mn/S is more than or equal to 65, the easy-pickling silicon steel hot-rolled plate strip with the thickness of the iron scale less than or equal to 10 mu m can be obtained in the subsequent hot rolling process.
The preparation method of the silicon steel plate easy to pickle of the embodiment comprises the following preparation process flows: the method comprises the steps of molten steel smelting → continuous casting → hot rolling → laminar cooling → coiling → cold rolling → continuous annealing → finishing, wherein the time for external refining in the molten steel smelting is controlled to be 37-40 min, the pulling speed is controlled to be 1.1-1.3 m/min in the continuous casting, the time for external refining is reduced to 37-40 min from 42-47 min, and the pulling speed for continuous casting is increased to 1.1-1.3 m/min from 0.9-1.0 m/min, so that the output speed of a casting blank is increased, the overall production rhythm is accelerated, and preparation is made for shortening the heating and heat preservation time in a heating furnace in the subsequent rolling process. Specifically, in this example, the time for external refining in the molten steel smelting process was controlled at 37min, and the casting speed in the continuous casting process was controlled at 1.3 m/min.
In the continuous casting process in the embodiment, the molten steel with the chemical components is continuously cast into a continuous casting billet with the thickness of 50-90 mm, and electromagnetic stirring is used in the continuous casting process. Specifically, the thickness of the continuous cast slab in this embodiment is 50 mm.
In the embodiment, the continuous casting billets are directly fed into the heating furnace without being cooled, the temperature of the heating furnace is controlled to be 1050-1200 ℃, and the total heating and heat preservation time in the heating furnace is less than 3 h. At present, the time of the conventional continuous casting billet in the heating furnace is 3h-4h, and the total heating and heat preservation duration of the continuous casting billet in the small heating furnace is less than 3h in the embodiment, so that the heating and heat preservation time of the continuous casting billet in the heating furnace is reduced, the surface oxidation degree of the continuous casting billet can be effectively reduced, the thickness of the surface oxide scales of the continuous casting billet is further reduced, and the energy saving and cost reduction effects are realized. Specifically, in the embodiment, the continuous casting slab is directly fed into the heating furnace without being cooled, the temperature of the heating furnace is 1050 ℃, and the total heating and heat preservation time in the heating furnace is 170 min.
In the hot rolling procedure in the embodiment, the rough rolling final rolling temperature is controlled to be 950-980 ℃, the rough rolling total reduction is more than or equal to 80%, the high-pressure dephosphorization is more than or equal to 3 times, and the dephosphorization water pressure is more than or equal to 20 MPa. Since the Si content of the silicon steel strip in this embodiment is required to be 2.0%, with the increase of the Si content, the secondary oxidation behavior of the surface of the silicon steel strip can be effectively alleviated in both the rough rolling and the finish rolling processes, but when the temperature of the rough rolling and the finish rolling is more than 1000 ℃, the alleviating effect is gradually weakened. Experimental research shows that when the rough rolling temperature exceeds 980 ℃, the surface oxidation degree of the silicon steel strip is increased, the inner layer of the silicon steel strip is oxidized to form ferrous silicate, and the ferrous silicate cannot be removed by a mechanical means on the outer surface, so that the rough rolling finishing temperature is controlled to be 950-980 ℃, more favorable tissue structures can be obtained in the rough rolling process, and the strong inheritance exists among the working procedures, namely the favorable tissue structures formed by rough rolling can be inherited to finish rolling. Meanwhile, the temperature of 700-900 ℃ is a sensitive area of the oxidation behavior of the steel, so that the thickness of the oxide layer on the surface of the silicon steel strip can be effectively reduced by avoiding the temperature area. Because the rough rolling final rolling temperature is controlled by the rolling speed, the lower the rolling speed is, the lower the rough rolling control temperature is, and the heating and heat preservation time in the heating furnace can be properly shortened and matched with each other to form a smooth production line. In the embodiment, the start rolling temperature of the finish rolling is controlled to be 930-980 ℃, the finish rolling temperature of the finish rolling is controlled to be 860-920 ℃, the total rolling reduction of the finish rolling is more than or equal to 90%, and the convexity of the silicon steel plate strip is less than or equal to 40 mu m after the finish rolling. The finish rolling temperature is higher than 860 ℃, the oxidation degree of the surface of the silicon steel strip can be effectively reduced, the sensitive area of the iron and steel oxidation behavior at 700-900 ℃ is avoided as much as possible, and the thickness of the oxidation layer on the surface of the silicon steel strip can also be effectively reduced. Specifically, in this embodiment, the rough rolling finishing temperature is controlled to be 980 ℃, the total reduction of rough rolling is 80%, phosphorus is removed for 4 times under high pressure, the phosphorus removal water pressure is 25MPa, the finish rolling start temperature is 950 ℃, the finish rolling temperature is 920 ℃, the total reduction of finish rolling is 90%, and the convexity of the silicon steel strip of the hot rolled finished product is 40 μm.
In the embodiment, the laminar cooling speed is more than or equal to 5 ℃/S, and the final temperature of the silicon steel strip is controlled to be 520-600 ℃. In the embodiment, the coiling temperature is controlled at 520-600 ℃, and the silicon steel plate strip which is easy to acid wash and has the thickness of the iron scale less than or equal to 10 mu m is obtained after the silicon steel plate strip is naturally cooled to the normal temperature. The purpose of general high-temperature coiling is to improve the magnetic induction of silicon steel, but in the embodiment, the content of Si in the steel is 2.0%, and the cold rolling process needs normalizing treatment, so that the coiling temperature can be not required, the requirement can be met by adopting low-temperature coiling, and the oxidation stage is avoided by the low-temperature coiling, so that the oxidation behavior in the coiling and cooling process of the steel strip can be effectively reduced, and the thickness of an oxide layer on the surface of the silicon steel strip is reduced. Meanwhile, the finish rolling temperature in the finish rolling process is generally required to be more than 860 ℃, and the silicon steel strip is rapidly cooled to below 600 ℃ from a high temperature of more than 860 ℃, so that the favorable organization structure in the silicon steel strip can be protected to be fully inherited, and the quality of subsequent silicon steel products is improved. Specifically, in the embodiment, the laminar cooling speed is 5 ℃/S, the coiling temperature is 600 ℃, the silicon steel strip with the average thickness of the scale of 4.64 μm is obtained after natural cooling to the normal temperature, as shown in fig. 1, the silicon steel strip is placed in acid liquor with the concentration of 140 g/L-200 g/L, the pickling speed is 28m/min, after the pickling is finished, the surface of the silicon steel strip is relatively white, as shown in fig. 2, the pickling effect is good.
Example 2
The easy-pickling silicon steel plate of the embodiment is basically the same as that of embodiment 1, except that the easy-pickling silicon steel plate of the embodiment comprises the following components in percentage by weight: c: 0.003%, Si: 2.3%, Mn: 0.20%, Als: 0.60%, S: 0.003%, P: 0.03%, N: 0.004%, Ti: 0.003% and the balance of Fe and inevitable impurities.
The preparation method of the silicon steel plate easy to pickle of the embodiment comprises the following production steps: pure molten steel smelted according to the chemical components is continuously cast into a casting blank with the thickness of 60mm by a casting machine, wherein the time for external refining in the molten steel smelting process is controlled to be 40min, and the drawing speed in the continuous casting process is controlled to be 1.3 m/min. In the embodiment, a casting blank is directly hot-charged into a furnace, the temperature in a heating furnace is 1140 ℃, the heat preservation time is 150min, the rough rolling final rolling temperature is controlled at 950 ℃, the rough rolling total reduction is 80%, the high-pressure dephosphorization is performed for 3 times, the dephosphorization water pressure is 30MPa, the finish rolling opening temperature is 930 ℃, the finish rolling temperature is 860 ℃, the finish rolling total reduction is 90%, the convexity of a silicon steel strip of a hot-rolled finished product is 35 μm, the laminar cooling speed is 10 ℃/S, the coiling temperature is controlled at 520 ℃, and after natural cooling to normal temperature, a silicon steel strip with the average thickness of iron scales of 5.82 μm is obtained, as shown in fig. 3, the silicon steel strip is placed in acid liquid with the concentration of 140 g/L-200 g/L, the pickling speed is 35m/min, and after the pickling is finished, the surface of the silicon steel strip is white, as shown in fig..
Example 3
The easy-pickling silicon steel plate of the embodiment is basically the same as that of embodiment 1, except that the easy-pickling silicon steel plate of the embodiment comprises the following components in percentage by weight: c: 0.002%, Si: 3.5%, Mn: 0.10%, Als: 0.80%, S: 0.001%, P: 0.01%, N: 0.002%, Ti: 0.004%, and the balance of Fe and inevitable impurities.
The preparation method of the silicon steel plate easy to pickle of the embodiment comprises the following production steps: the pure molten steel is smelted according to the chemical components, a casting blank with the thickness of 90mm is continuously cast by a casting machine, the molten steel is directly hot-charged into a furnace, the heating temperature is 1200 ℃, the heat preservation time is 160min, the rough rolling final rolling temperature is 960 ℃, the reduction is 85%, the high-pressure phosphorus removal is 3 times, the phosphorus removal water pressure is 25MPa, the finish rolling starting temperature is 950 ℃, the finish rolling final rolling temperature is 890 ℃, the finish rolling total reduction is 95%, the convexity of the hot-rolled finished silicon steel strip is 33 mu m, the laminar cooling speed is 12 ℃/S, the coiling temperature is 580 ℃, and after natural cooling to the normal temperature, the silicon steel strip with the mean value of the thickness of the iron scale of 3.64 mu m is obtained, as shown in figure 5, the silicon steel strip is placed in acid liquor with the concentration of 140 g/L-200 g/L, the pickling speed is 30m/min, and after the pickling, the surface of the silicon steel strip is.
Comparative example 1
The silicon steel plate comprises the following components in percentage by weight: c: 0.002%, Si: 2.4%, Mn: 0.20%, Als: 0.60%, S: 0.004, P: 0.018, N: 0.0030, Ti: 0.0028, and the balance of Fe and inevitable impurities.
The preparation method of the silicon steel plate of the comparative example comprises the following production steps: smelting pure molten steel according to the chemical components, continuously casting a casting blank with the thickness of 50mm by a casting machine, directly hot-charging the casting blank into a furnace, heating the casting blank at 1180 ℃, keeping the temperature for 200min, controlling the rough rolling final rolling temperature at 1000 ℃, the reduction at 80%, carrying out high-pressure dephosphorization for 3 times, carrying out dephosphorization water pressure at 30MPa, the finish rolling starting temperature at 980 ℃, the finish rolling final rolling temperature at 880 ℃, the finish rolling total reduction at 90%, controlling the convexity of the hot-rolled finished silicon strip at 40 mu m, carrying out laminar cooling at the speed of 5 ℃/S, controlling the coiling temperature at 650 ℃, naturally cooling to normal temperature to obtain the silicon strip with the average thickness of the iron scale of 19.56 mu m, as shown in fig. 7, the silicon steel strip is placed in acid solution with the concentration of 140 g/L-200 g/L, the pickling speed is 25m/min, and after the pickling is finished, the surface of the silicon steel strip has an obvious under-pickling phenomenon, as shown in figure 8, the pickling effect is poor.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (8)
1. An easy pickling silicon steel plate is characterized in that: comprises the following components in percentage by weight: c is less than or equal to 0.005%, Si: 2.0% -3.2%, Mn: 0.1% -0.35%, Als: 0.5 to 1.0 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.04 percent of P, less than or equal to 0.005 percent of N, less than or equal to 0.005 percent of Ti, and the balance of Fe and inevitable impurities, wherein the content of Mn and S satisfies that the content of Mn/S is more than or equal to 65.
2. A preparation method of a silicon steel plate easy to pickle is characterized by comprising the following steps: the preparation process flow is as follows: the method comprises the steps of molten steel smelting, continuous casting, hot rolling, laminar cooling, coiling, cold rolling, continuous annealing and finishing, wherein the time for external refining in the molten steel smelting is controlled to be 37-40 min, and the drawing speed in the continuous casting is controlled to be 1.1-1.3 m/min.
3. The method for preparing easy-pickling silicon steel plates according to claim 2, characterized by comprising the following steps: the molten steel with the chemical components is continuously cast into a continuous casting billet with the thickness of 50 mm-90 mm, and electromagnetic stirring is used in the continuous casting process.
4. The method for preparing easy-pickling silicon steel plates according to claim 3, characterized by comprising the following steps: the continuous casting billet is directly put into a heating furnace without being cooled, the temperature of the heating furnace is controlled to be 1050-1200 ℃, and the total time of heating and heat preservation in the heating furnace is less than 3 h.
5. The method for preparing easy-pickling silicon steel plates according to claim 4, characterized by comprising the following steps: in the hot rolling procedure, the rough rolling final rolling temperature is controlled to be 950-980 ℃, the rough rolling total reduction is more than or equal to 80%, the high-pressure dephosphorization is more than or equal to 3 times, and the dephosphorization water pressure is more than or equal to 20 MPa.
6. The method for preparing easy-pickling silicon steel plates according to claim 5, characterized by comprising the following steps: the start rolling temperature of finish rolling is controlled to be 930-980 ℃, the finish rolling temperature of finish rolling is controlled to be 860-920 ℃, the total rolling reduction of finish rolling is more than or equal to 90%, and the convexity of the silicon steel plate strip is less than or equal to 40 μm after finish rolling.
7. The method for preparing easy-pickling silicon steel plates according to claim 6, characterized by comprising the following steps: the laminar cooling speed is more than or equal to 5 ℃/S, and the final temperature of the silicon steel plate strip is controlled to be 520-600 ℃.
8. The method for preparing easy-pickling silicon steel plates according to claim 7, characterized by comprising the following steps: and the coiling temperature is controlled at 520-600 ℃, and the silicon steel plate strip which is easy to be pickled and has the thickness of the iron scale less than or equal to 10 mu m is obtained after the silicon steel plate strip is naturally cooled to the normal temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010602167.0A CN111733362B (en) | 2020-06-29 | 2020-06-29 | Silicon steel plate easy to pickle and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010602167.0A CN111733362B (en) | 2020-06-29 | 2020-06-29 | Silicon steel plate easy to pickle and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111733362A true CN111733362A (en) | 2020-10-02 |
| CN111733362B CN111733362B (en) | 2021-12-14 |
Family
ID=72651497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010602167.0A Active CN111733362B (en) | 2020-06-29 | 2020-06-29 | Silicon steel plate easy to pickle and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111733362B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877963A (en) * | 2021-09-28 | 2022-01-04 | 日照钢铁控股集团有限公司 | Control method for pressing in iron scale on surface of hot-rolled silicon-controlled strip steel |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010050A (en) * | 1975-09-08 | 1977-03-01 | Allegheny Ludlum Industries, Inc. | Processing for aluminum nitride inhibited oriented silicon steel |
| CN1274393A (en) * | 1998-05-18 | 2000-11-22 | 川崎制铁株式会社 | Electrical sheet of excellent magnetic characteristics and method of mfg. same |
| CN102330021A (en) * | 2011-09-16 | 2012-01-25 | 江油市丰威特种带钢有限责任公司 | Full production process of low-temperature oriented silicon steel |
| CN104313467A (en) * | 2014-09-23 | 2015-01-28 | 北京首钢股份有限公司 | Non-oriented electrical steel smelting method |
| CN107723591A (en) * | 2017-09-28 | 2018-02-23 | 马钢(集团)控股有限公司 | A kind of new-energy automobile motor cold rolling non-oriented electrical steel and its production method |
-
2020
- 2020-06-29 CN CN202010602167.0A patent/CN111733362B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4010050A (en) * | 1975-09-08 | 1977-03-01 | Allegheny Ludlum Industries, Inc. | Processing for aluminum nitride inhibited oriented silicon steel |
| CN1274393A (en) * | 1998-05-18 | 2000-11-22 | 川崎制铁株式会社 | Electrical sheet of excellent magnetic characteristics and method of mfg. same |
| CN102330021A (en) * | 2011-09-16 | 2012-01-25 | 江油市丰威特种带钢有限责任公司 | Full production process of low-temperature oriented silicon steel |
| CN104313467A (en) * | 2014-09-23 | 2015-01-28 | 北京首钢股份有限公司 | Non-oriented electrical steel smelting method |
| CN107723591A (en) * | 2017-09-28 | 2018-02-23 | 马钢(集团)控股有限公司 | A kind of new-energy automobile motor cold rolling non-oriented electrical steel and its production method |
Non-Patent Citations (2)
| Title |
|---|
| 卢凤喜等: "《国外冷轧硅钢生产技术》", 31 March 2013, 冶金工业出版社 * |
| 徐鹤贤等: "《冷轧窄带钢生产》", 30 August 1992, 东北工学院出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877963A (en) * | 2021-09-28 | 2022-01-04 | 日照钢铁控股集团有限公司 | Control method for pressing in iron scale on surface of hot-rolled silicon-controlled strip steel |
| CN113877963B (en) * | 2021-09-28 | 2024-02-13 | 日照钢铁控股集团有限公司 | Control method for pressing oxide scale on surface of hot rolled silicon controlled steel strip |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111733362B (en) | 2021-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101914725B (en) | Low-carbon ultra-deep punching cold-rolling steel sheet and production method thereof | |
| CN100463979C (en) | Manufacturing method of cold rolling electric steel special for compressor | |
| CN102925817B (en) | Cold-rolled steel sheet with yield strength of 980 MPa grade and manufacturing method thereof | |
| CN110465546B (en) | Method for solving peeling and falling of oxide scales welded by acid washing plate for compressor | |
| CN103114257B (en) | Acid-washing-free high-strength crossbeam steel with stable oxide layer and preparation method of steel | |
| CN107502819B (en) | A kind of 600MPa grades of 0.6mm or less thin gauge cold-rolled biphase steel and preparation method thereof | |
| CN109136444A (en) | Quickly, the new energy car battery shell steel and production method of punch process is thinned | |
| CN109097687B (en) | Preparation method of non-oriented silicon steel for direct-drive wind driven generator | |
| CN110284070A (en) | A kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method | |
| CN107475625B (en) | A kind of the electrogalvanizing cold-rolled steel sheet and production method of yield strength >=350MPa | |
| CN110273108A (en) | A kind of deep-draw grade electrogalvanizing hot rolling acid-cleaning steel plate and its production method | |
| CN109822070B (en) | Non-oriented electrical steel for electric driving of thin slab full-endless rolling and preparation method thereof | |
| CN108396243A (en) | A kind of bottle cap hard tinning substrate and its production method | |
| CN110714165B (en) | Cold-rolled sheet for 320 MPa-level household appliance panel and production method thereof | |
| CN113751679B (en) | Manufacturing method of cobalt-free maraging steel cold-rolled thin strip | |
| CN111575592A (en) | Low-alloy high-strength steel with yield strength of 460MPa and production method thereof | |
| CN107699797A (en) | 390MPa levels continuous annealing cold rolled automobile structural steel and iron and its production method | |
| CN105256225A (en) | Cold-rolled steel plate for elevator and preparation method for cold-rolled steel plate | |
| CN112795731A (en) | Cold-rolled steel plate for lampshade and production method thereof | |
| CN110904392A (en) | Ultra-low carbon anti-pressure thin-specification cold-rolled sheet for battery shell and production method thereof | |
| CN111733362B (en) | Silicon steel plate easy to pickle and production method thereof | |
| CN106048140A (en) | Production method of non-oriented electrical steel 50w800 with blueing coating | |
| CN106086354A (en) | A kind of production method of the coating non-oriented electrical steel 50W600 that turns blue | |
| CN109182907B (en) | Method for producing semi-process non-oriented electrical steel by endless rolling | |
| CN115216684B (en) | Production method of low-magnetic austenitic stainless steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |