CN113198866B - Thin-gauge middle-high-grade non-oriented silicon steel acid rolling production process - Google Patents
Thin-gauge middle-high-grade non-oriented silicon steel acid rolling production process Download PDFInfo
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- CN113198866B CN113198866B CN202110495952.5A CN202110495952A CN113198866B CN 113198866 B CN113198866 B CN 113198866B CN 202110495952 A CN202110495952 A CN 202110495952A CN 113198866 B CN113198866 B CN 113198866B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/021—Rolls for sheets or strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
- B21B45/0245—Lubricating devices
- B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
- B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
Abstract
A thin-gauge medium-high grade non-oriented silicon steel acid rolling production process belongs to the technical field of non-oriented silicon steel cold rolling forming, and comprises the steps of preheating a welding seam before welding and heating the welding seam twice after welding, rolling by a five-rack six-roller cold continuous rolling unit, wherein the reduction rates are respectively 35% -45%,30% -36%,25% -30%,1% -10%, and the unit tensions among a first cold rolling mill, a second cold rolling mill, a third cold rolling mill, a fourth cold rolling mill and a fourth cold rolling mill are respectively 120-130KN/mm 2 、130‑140KN/mm 2 、150‑160KN/mm 2 And 160-180KN/mm 2 The cold continuous rolling process has the beneficial effects that the cold continuous rolling process is improved and optimized, so that the rolling efficiency of the high-grade non-oriented silicon steel strip in the thin specification is improved, the qualification rate of the same plate difference is improved, and the strip breakage rate and the rolling breakage rate of rolling are reduced.
Description
Technical Field
The invention relates to the technical field of thin-specification medium-high-grade non-oriented silicon steel cold rolling forming, in particular to a thin-specification medium-high-grade non-oriented silicon steel acid rolling production process.
Background
The non-oriented silicon steel is widely applied to the stator and the rotor of the motor and has extremely high requirements on the tolerance precision and the uniformity of the longitudinal thickness and the transverse thickness. The thin medium-high grade non-oriented silicon steel refers to the grade of non-oriented silicon steel with the thickness less than or equal to 0.35mm and the Si content of 1.5-2.0%, and is mainly applied to high-end motor products. Because the Si content is high and the reduction rate is high, the cold rolling of the grade of non-oriented silicon steel is generally produced on a six-roller single-stand reversible rolling mill after push-pull type pickling, the time for pickling a roll of the medium-high grade non-oriented silicon steel is 35-40 minutes, the time for rolling a roll of the medium-high grade non-oriented silicon steel with the thickness of 0.35mm by using a single stand is 50-55 minutes, and the time for rolling a hard roll from a hot roll to a cold roll is 85-95 minutes; the yield is low, and the trimming yield is about 94.5; the thickness tolerance precision is low, the longitudinal thickness tolerance is +/-10 mu m, the qualified rate of the transverse same-plate difference which is less than or equal to 7 mu m is 50 percent, and the qualified rate of the transverse same-plate difference which is less than or equal to 10 mu m is 75 percent, so that the requirement of a high-end user cannot be met.
Disclosure of Invention
In order to solve the technical problems, the invention provides a thin-gauge medium-high-grade non-oriented silicon steel acid rolling production process, which reduces the strip breakage rate, improves the rolling efficiency and improves the qualification rate of the transverse same-plate difference by improving and adjusting rolling equipment and a rolling process.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the thin-specification medium-high grade non-oriented silicon steel acid rolling production process comprises the following steps of sequentially carrying out uncoiling, straightening, welding, pulling and straightening, acid washing, edge cutting, continuous rolling and coiling on the thin-specification medium-high grade non-oriented silicon steel, wherein the thickness range of the thin-specification medium-high grade non-oriented silicon steel is 0.3-0.35 mm, and the silicon content range is 1.5% -2.0%, and the production process comprises the following steps of:
1) Preheating the welding seam before head and tail welding of a non-oriented silicon steel strip with the thickness of 2.3-2.5 mm, after welding, primarily post-heating the welding seam area, and secondarily post-heating the welding seam area by using auxiliary heating equipment after primary post-heating treatment, wherein the temperature of secondary post-heating is 500-600 ℃, and the heating time is 30-40 s;
2) In the continuous rolling process, a five-stand six-roller cold continuous rolling unit is adopted, wherein the working rollers on the first, second and third cold rolling mills all adopt chamfer rollers, the axial movement amount of the middle roller in the five-stand six-roller cold continuous rolling unit is 0, the reduction ratios of the first, second, third, fourth and fifth cold rolling mills are respectively 35-45%, 30-36%, 25-30% and 1-10%, and the unit tension between the first and second cold rolling mills is 120-130N/mm 2 The unit tension between the second and third cold rolling mills is 130-140N/mm 2 The unit tension between the third and fourth cold rolling mills is 150-160N/mm 2 The unit tension between the fourth and fifth cold rolling mills is 160-180N/mm 2 。
And (3) welding the non-oriented silicon steel coil end to end by using a laser welding machine, wherein the welding speed is 3.6-4.2m/min, the welding power is 9.6-10.8kW, the preheating power is 15-22.5kW, and the heating power after the initial welding is 22.5-30kW.
The chamfer height of the working rolls on the first, second and third cold rolling mills is 0.6-0.8mm, and the chamfer length is 300-375mm.
The chamfer height of the middle roller of the five-frame six-roller cold continuous rolling unit is 0.2-0.5 mm, and the chamfer length is 50-100 mm.
The roughness of the working rolls of the first cold rolling mill and the second cold rolling mill is set to be 0.8-1.5 mu m.
And in the continuous rolling process, emulsion injection is adopted for lubrication and cooling, the concentration of the emulsion in the first, second, third and fourth cold rolling mills is set to be 2.0-2.5%, and the concentration of the emulsion in the fifth cold rolling mill is set to be 0.3-1.0%.
After the non-oriented silicon steel is continuously rolled by the five-frame six-roller cold continuous rolling unit, the qualification rate of the transverse same-plate difference of less than or equal to 7 microns is 83-87%, and the qualification rate of the transverse same-plate difference of less than or equal to 10 microns is 96-98%.
The tension-straightening process is characterized in that a two-bending one-straightening type tension-straightening machine is used, the tension-straightening machine comprises a bending roller set I, a bending roller set II and a straightening roller set which are sequentially arranged along the straightening direction of a non-oriented silicon steel strip, the roll gap range of the bending roller set I is 20-25mm, the roll gap range of the bending roller set II is 15-22mm, the roll gap range of the straightening roller set is 10-15mm, and when the welding line of the non-oriented silicon steel strip passes through the tension-straightening machine, the tension-straightening machine adopts a speed reduction tension-straightening mode.
The pickling tanks used in the pickling process comprise 3 pickling tanks, the concentration of acid liquor in the 3 pickling tanks is respectively set to be 60-80g/l, 100-130g/l and 160-180g/l along the pickling direction of the non-oriented silicon steel strip, the temperature of the acid liquor in the pickling tanks is 75-85 ℃, the pickling speed is 200-230m/min, and the flow rate of the acid liquor is 110-150m 3 /h。
The edge trimming process is characterized in that a circle shear is used for cutting the edge defects of the non-oriented silicon steel strip, the side gap of the shear edge of the circle shear is set to be 0.15-0.25mm, the overlapping amount is set to be 0.3-0.4mm, and the edge trimming yield is 96.5% -97%.
The invention has the beneficial effects that:
1. according to the invention, the area to be welded is preheated before welding, and after the welding is finished, the welding seam area is subjected to primary post-heating and then subjected to secondary post-heating by using the auxiliary heating equipment, so that the metallographic structure and performance of the welding seam can be improved, the residual stress of the welding seam is eliminated, and the strip breakage rate of the welding seam is reduced.
2. According to the invention, the five-rack six-roller cold continuous rolling unit is adopted for rolling, so that compared with single-rack multi-pass cold rolling, the rolling time of each coil of strip steel is greatly shortened, and the production efficiency is improved; the edge part thinning of the strip steel can be effectively controlled by arranging the chamfers at the end parts of the working rolls on the first cold rolling mill, the second cold rolling mill and the third cold rolling mill of the five-stand six-roll cold continuous rolling mill unit, so that the transverse same-plate difference of the non-oriented silicon steel strip is reduced; by setting the axial movement amount of the intermediate rolls to be 0, even if the distance between the edge of the strip steel and the edge of the overlapped area of the roll bodies of the two opposite intermediate rolls is 0, the harmful contact part of the working roll and the supporting roll is completely eliminated, and the deflection of the working roll caused by rolling force is reduced, thereby reducing the thinning amount of the edge of the strip steel and further reducing the transverse same-plate difference of the non-oriented silicon steel strip.
3. According to the invention, the reduction rate of each cold rolling mill of the five-stand six-roller cold continuous rolling unit and the unit tension between the cold rolling mills are set and distributed, along the rolling direction of the strip steel, the reduction rate of the cold rolling mill is gradually reduced, the unit tension is gradually increased, and the rolling rotting rate of the high-grade non-oriented silicon steel strip in the thin specification is reduced.
4. According to the invention, the injection concentration of the emulsion in the fifth cold rolling mill is greater than that of the emulsion in the first, second, third and fourth cold rolling mills, so that the thermal expansion degree of the working roll can be effectively controlled, and the flatness of the plate shape is better; in the pickling process, 3 pickling tanks with gradually increased acid liquor concentration are adopted, so that oxide skins and rusty materials on the surface of the steel strip can be effectively removed; by setting the side clearance and the overlapping amount range of the shearing edge of the circle shear, the defects of the edge of the steel strip after pickling can be effectively removed, the rolling mill in the later period is ensured to roll smoothly, and the same plate difference after rolling is further reduced.
In conclusion, the cold continuous rolling process is improved and optimized, so that the rolling efficiency of the high-grade and medium-grade non-oriented silicon steel strip in thin specification is improved, the qualification rate of the same-plate difference is improved, and the strip breakage rate and the rolling breakage rate of rolling are reduced.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a flow chart of the production process of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The specific implementation scheme of the invention is as follows: as shown in figure 1, the invention provides a thin-specification medium-high grade non-oriented silicon steel acid rolling production process, wherein the thickness range of the thin-specification medium-high grade non-oriented silicon steel is 0.3-0.35 mm, the silicon content range is 1.5% -2.0%, the non-oriented silicon steel is sequentially subjected to the following steps of uncoiling, straightening, welding, straightening, acid cleaning, trimming, continuous rolling and coiling, wherein:
1) Welding: the method comprises the steps of welding a hot-rolled non-oriented silicon steel strip with the thickness of 2.3-2.5 mm end to end by using a laser welding machine, preheating a base metal of a region to be welded before welding, wherein the preheating power is 15-22.5kW, then welding is carried out, the welding speed is 3.6-4.2m/min, the welding power is 9.6-10.8kW, carrying out primary post-heating on a welding seam region after welding is finished, the heating power is 22.5-30kW after the primary post-heating, carrying out secondary post-heating on the welding seam region by using auxiliary heating equipment after the primary post-heating treatment, the temperature of the secondary post-heating is 500-600 ℃, and the heating time is 30-40 s, so that the metallographic structure and the performance of the welding seam are improved, the residual stress of the welding seam is eliminated, and the strip breakage rate of the welding seam is reduced.
2) And (3) withdrawal straightening: the tension-straightening operation is carried out by using a two-bending one-straightening type tension-straightening machine, the tension-straightening machine comprises a bending roller set I, a bending roller set II and a straightening roller set which are sequentially arranged along the straightening direction of the non-oriented silicon steel strip, the roll gap range of the bending roller set I is 20-25mm, the roll gap range of the bending roller set II is 15-22mm, the roll gap range of the straightening roller set is 10-15mm, the elongation rate range is 1.2% -1.5%, and when the welding seam of the non-oriented silicon steel strip passes through the tension-straightening machine, the tension-straightening machine adopts a speed reduction tension-straightening mode, so that the condition that the strip is broken due to the fact that the tension-straightening speed at the welding seam is too high is avoided.
3) Acid washing: the acid washing tank used in the acid washing process comprises 3 acid washing tanks, the concentration of acid liquor in the 3 acid washing tanks is respectively set to be 60-80g/l, 100-130g/l and 160-180g/l along the acid washing direction of the non-oriented silicon steel strip, the temperature of the acid liquor in the acid washing tanks is 75-85 ℃, the acid washing speed is 200-230m/min, and the flow rate of the acid liquor is 110-150m 3 And h, the concentration of the acid liquor in the 3 pickling tanks is gradually increased, so that oxide skins and rusty materials on the surface of the steel strip can be effectively removed, and the pickling efficiency is improved.
4) Trimming: the edge defects of the non-oriented silicon steel strip are cut off by using the disc shear in the edge cutting process, the side gap of the shear blade of the disc shear is set to be 0.15-0.25mm, the overlapping amount is set to be 0.3-0.4mm, the edge defects of the acid-washed steel strip can be effectively cut off, the edge cutting yield is 96.5% -97%, the smooth rolling of a rolling mill in the later period is ensured, and the same plate difference after rolling is further reduced.
5) Continuous rolling: in the continuous rolling process, a five-stand six-roller cold continuous rolling unit is adopted, wherein the working rollers on the first, second and third cold rolling mills all adopt chamfer rollers, the chamfer height of the working rollers on the first, second and third cold rolling mills is 0.6-0.8mm, the chamfer length is 300-375mm, and the working rollers on the fourth and fifth cold rolling mills are flat rollers, because the five-stand six-roller cold continuous rolling mill only has the roll shifting function of a middle roller and does not have the roll shifting function of the working rollers, the edge thinning is not favorably controlled, and the edge thinning can be effectively controlled by arranging chamfers at the end parts of the working rollers on the first, second and third cold rolling mills of the five-stand six-roller cold continuous rolling unit, and the chamfer height of the working rollers of the first cold rolling mill and the second cold rolling mill is greater than the chamfer height of the working roller of the third cold rolling mill, so that the transverse same-plate strip steel difference of a non-oriented strip steel is reduced on the premise of avoiding strip breakage of the rolling mill; the roughness of the working rolls of the first cold rolling mill and the second cold rolling mill is set to be 0.8-1.5 mu m, the roughness of the working rolls of the third cold rolling mill, the fourth cold rolling mill and the fifth cold rolling mill is set to be 0.4-0.6 mu m, and the risk of slipping of the strip steel in the early stage of rolling is reduced; middle roller axial direction in five-frame six-roller cold continuous rolling unitThe moving amount is 0, so that the distance between the edge of the strip steel and the edge of the overlapped area of the roller bodies of two opposite intermediate rollers is 0, the harmful contact part of the working roller and the supporting roller is completely eliminated, the deflection of the working roller caused by rolling force is reduced, the thinning amount of the edge of the strip steel is reduced, the transverse same-plate difference of the non-oriented silicon steel strip is further reduced, the chamfer height of the intermediate rollers is 0.2-0.5 mm, the chamfer length is 50-100 mm, the chamfer height is reduced, and the roll shifting mark caused by the roll shifting of the intermediate rollers can be reduced; the rolling reduction rates of the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill and the fifth cold rolling mill are respectively 35-45%, 30-36%, 25-30% and 1-10%, and the unit tension between the first cold rolling mill and the second cold rolling mill is 120-130N/mm 2 The unit tension between the second and third cold rolling mills is 130-140N/mm 2 The unit tension between the third and fourth cold rolling mills is 150-160N/mm 2 The unit tension between the fourth and fifth cold rolling mills is 160-180N/mm 2 Along the rolling direction of the strip steel, the reduction rate of the cold rolling mill is gradually reduced, the unit tension is gradually increased, the rolling force can be reduced, and the rolling rotting rate of the high-grade non-oriented silicon steel strip in the thin specification is reduced.
The process of the tandem rolling adopts emulsion injection for lubrication and cooling, the concentration of the emulsion in the first, second, third and fourth cold rolling mills is set to be 2.0-2.5%, the concentration of the emulsion in the fifth cold rolling mill is set to be 0.3-1.0%, the concentration of the emulsion in the fifth cold rolling mill is less than that of the emulsion in the first, second, third and fourth cold rolling mills, the thermal expansion degree of the working roll can be effectively controlled, and the flatness of the plate shape is better.
6) Coiling: the rolled steel strip is coiled at a predetermined speed by a coiler.
After being rolled by a five-rack six-roller cold continuous rolling unit and the process, the time from hot rolling to hard rolling is about 7 minutes, the production efficiency is greatly improved, the qualified rate of the transverse same-plate difference of less than or equal to 7 mu m is 83-87 percent, and the qualified rate of the transverse same-plate difference of less than or equal to 10 mu m is 96-98 percent, so that the requirements of high-end users can be met.
The following examples are specifically described by taking the rolling process of non-oriented silicon steel strips with different thicknesses as an example.
Example 1
Taking the rolling for producing the non-oriented silicon steel with the thickness of 0.3mm and the silicon content of 1.5-2.0 percent as an example, the rolling process is described in detail as follows:
1) Uncoiling and straightening: uncoiling a coiled non-oriented silicon steel strip with the thickness of 2.3mm by using an uncoiler, and straightening the non-oriented silicon steel strip by using a straightener;
2) Welding: the straightened hot-rolled non-oriented silicon steel strip is welded end to end by using a laser welding machine, a base metal of a region to be welded is preheated before welding, the preheating power is 15kW, then welding is carried out, the welding speed is 3.6m/min, the welding power is 9.6kW, the welding seam region is subjected to primary post-heating after the welding is finished, the primary post-heating power is 22.5kW, secondary post-heating is carried out on the welding seam region by using auxiliary heating equipment after the primary post-heating treatment, the heating temperature of the secondary post-heating is 500-600 ℃, and the heating time is 30-40 s, the metallographic structure and the performance of the welding seam are improved, the residual stress of the welding seam is eliminated, and the strip breakage rate of the welding seam is reduced.
2) Pulling and straightening: the method is characterized in that a two-bending one-straightening type withdrawal and straightening machine is used for withdrawal and straightening operation, the roll gap value of a bending roll set I in the withdrawal and straightening machine is 20mm, the roll gap value of a bending roll set II is 15mm, the roll gap value of a straightening roll set is 10mm, and the withdrawal and straightening elongation rate is 1.3%.
3) Acid washing: the acid washing tanks used in the acid washing process comprise 3 acid washing tanks, the concentration of acid liquor in the 3 acid washing tanks is respectively set to be 60g/l, 100g/l and 160g/l along the acid washing direction of the non-oriented silicon steel strip, the temperature of the acid liquor in the acid washing tanks is 75 ℃, the acid washing speed is 200m/min, and the flow rate of the acid liquor is 110m 3 And h, the concentration of the acid liquor in the 3 pickling tanks is gradually increased, so that oxide skins and rusty materials on the surface of the steel strip can be effectively removed, and the pickling efficiency is improved.
4) Trimming: the edge defects of the non-oriented silicon steel strip are cut off by using the disc shear in the edge cutting process, the side gap of the shear blade of the disc shear is set to be 0.15mm, the overlapping amount is set to be 0.3mm, the edge defects of the acid-washed steel strip can be effectively cut off, the smooth rolling of a rolling mill in the later period is ensured, and the same plate difference after the rolling is further reduced.
5) Continuous rolling: in the continuous rolling process, the reduction ratios of the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill and the fifth cold rolling mill are respectively 45 percent, 36 percent, 27 percent and 8 percent, and the unit tension between the first cold rolling mill and the second cold rolling mill is 120N/mm 2 The unit tension between the second and third cold rolling mills is 130N/mm 2 The unit tension between the third and fourth cold rolling mills is 150N/mm 2 The unit tension between the fourth and fifth cold rolling mills is 160N/mm 2 Along the rolling direction of the strip steel, the reduction rate of a cold rolling mill is gradually reduced, the unit tension is gradually increased, and the rolling rotting rate of the non-oriented silicon steel strip is 0.5%.
The process of the tandem rolling adopts emulsion injection for lubrication and cooling, the concentration of the emulsion in the first, second, third and fourth cold rolling mills is set to be 2.0%, the concentration of the emulsion in the fifth cold rolling mill is set to be 0.3%, the concentration of the emulsion in the fifth cold rolling mill is less than that of the emulsion in the first, second, third and fourth cold rolling mills, the thermal expansion degree of the working roll can be effectively controlled, and the flatness of the plate shape is better.
6) Coiling: the rolled steel strip was coiled at a set speed using a coiler.
By adopting the process, the time for uncoiling to pickling is 12 minutes for medium and high grade non-oriented silicon steel with the thickness of 2.3mm, the time for rolling a roll of the medium and high grade non-oriented silicon steel with the thickness of 0.3mm is 8 minutes, and the time for rolling from hot rolling to hard rolling is 20 minutes, so that the production efficiency is greatly improved, and the yield of edge cutting reaches 96.5-97%.
Example 2
Taking the rolling for producing the non-oriented silicon steel with the thickness of 0.33mm and the silicon content of 1.5-2.0% as an example, the rolling process is described in detail as follows:
1) Uncoiling and straightening: uncoiling a coiled non-oriented silicon steel strip with the thickness of 2.3mm by using an uncoiler, and straightening the non-oriented silicon steel strip by using a straightener;
2) Welding: the straightened hot-rolled non-oriented silicon steel strip is welded end to end by using a laser welding machine, a base metal of a region to be welded is preheated before welding, the preheating power is 18kW, then welding is carried out, the welding speed is 3.8m/min, the welding power is 10.2kW, after welding is finished, primary post-heating is carried out on a welding seam region, the primary post-heating power is 25kW, after primary post-heating treatment, secondary post-heating is carried out on the welding seam region by using auxiliary heating equipment, the heating temperature of the secondary post-heating is 500-600 ℃, the heating time is 30-40 s, the metallographic structure and the performance of the welding seam are improved, the residual stress of the welding seam is eliminated, and the strip breakage rate of the welding seam is reduced.
2) Pulling and straightening: the method comprises the following steps of performing withdrawal and straightening operation by using a two-bending one-straightening type withdrawal and straightening machine, wherein the roll gap value of a bending roll group I in the withdrawal and straightening machine is 22mm, the roll gap value of a bending roll group II is 18mm, the roll gap value of a straightening roll group is 12mm, and the withdrawal and straightening elongation is 1.3%.
3) Acid washing: the acid washing tanks used in the acid washing process comprise 3 acid washing tanks, the concentration of acid liquor in the 3 acid washing tanks is respectively set to be 70g/l, 120g/l and 170g/l along the acid washing direction of the non-oriented silicon steel strip, the temperature of the acid liquor in the acid washing tanks is 80 ℃, the acid washing speed is 220m/min, and the flow rate of the acid liquor is 130 m/min 3 And h, the concentration of the acid liquor in the 3 pickling tanks is gradually increased, so that the oxide skin and rusty materials on the surface of the steel strip can be effectively removed.
4) Trimming: the edge defects of the non-oriented silicon steel strip are cut off by using the disc shear in the edge cutting process, the side gap of the shear blade of the disc shear is set to be 0.2mm, the overlapping amount is set to be 0.35mm, the edge defects of the acid-washed steel strip can be effectively cut off, the smooth rolling of a rolling mill in the later period is ensured, and the same plate difference after the rolling is further reduced.
5) Continuous rolling: in the continuous rolling process, the reduction ratios of the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill and the fifth cold rolling mill are respectively 41 percent, 42 percent, 36 percent, 30 percent and 6 percent, and the unit tension between the first cold rolling mill and the second cold rolling mill is 125N/mm 2 The unit tension between the second and third cold rolling mills is 135N/mm 2 The unit tension between the third and fourth cold rolling mills is 155N/mm 2 Unit sheet between fourth and fifth cold rolling millsForce is 170N/mm 2 Along the rolling direction of the strip steel, the reduction rate of a cold rolling mill is gradually reduced, the unit tension is gradually increased, and the rolling breakage rate of the non-oriented silicon steel strip is 0.5%.
The emulsion is sprayed for lubrication and cooling in the continuous rolling process, the concentration of the emulsion in the first, second, third and fourth cold rolling mills is set to be 2.3 percent, the concentration of the emulsion in the fifth cold rolling mill is set to be 0.5 percent, and the concentration of the emulsion in the fifth cold rolling mill is less than that of the emulsion in the first, second, third and fourth cold rolling mills, so that the thermal expansion degree of the working roll can be effectively controlled before the strip steel is discharged from the rolling mill, and the flatness of the strip shape is better.
6) Coiling: the rolled steel strip was coiled at a set speed using a coiler.
By adopting the process, 11.5 minutes is needed from uncoiling to acid cleaning of the medium and high grade non-oriented silicon steel with the thickness of 2.3mm, 9 minutes is needed from rolling a coil of the medium and high grade non-oriented silicon steel with the thickness of 0.33mm, and 20.5 minutes is consumed from hot coiling to hard rolling, so that the production efficiency is greatly improved, and the yield of the edge cutting reaches 96.5-97%.
Example 3
Taking the rolling of non-oriented silicon steel with the thickness of 0.35mm and the silicon content of 1.5-2.0% as an example, the rolling process is described in detail as follows:
1) Uncoiling and straightening: uncoiling a coiled non-oriented silicon steel strip with the thickness of 2.3mm by using an uncoiler, and straightening the non-oriented silicon steel strip by using a straightener;
2) Welding: the straightened hot-rolled non-oriented silicon steel strip is welded end to end by using a laser welding machine, a base metal of a region to be welded is preheated before welding, the preheating power is 22.5kW, then welding is carried out, the welding speed is 4.2m/min, the welding power is 10.8KW, the welding seam region is subjected to primary post-heating after the welding is finished, the primary post-heating power is 30kW, secondary post-heating is carried out on the welding seam region by using auxiliary heating equipment after the primary post-heating treatment, the heating temperature of the secondary post-heating is 500-600 ℃, the heating time is 30-40 s, the metallographic structure and the performance of the welding seam are improved, the residual stress of the welding seam is eliminated, and the strip breakage rate of the welding seam is reduced.
2) Pulling and straightening: and performing withdrawal and straightening operation by using a two-bending one-straightening type withdrawal and straightening machine, wherein the roll gap value of a bending roll set I in the withdrawal and straightening machine is 25mm, the roll gap value of a bending roll set II is 22mm, the roll gap value of a straightening roll set is 15mm, and the withdrawal and straightening elongation is 1.3%. And when the non-oriented silicon steel strip welding line passes through the tension leveler, the tension leveler adopts a speed reduction tension leveler mode, so that the condition that the strip is broken due to the fact that the tension leveler is too fast at the welding line is avoided.
3) Acid washing: the pickling tanks used in the pickling process comprise 3 pickling tanks, the concentration of acid liquor in the 3 pickling tanks is respectively set to be 80g/l, 130g/l and 180g/l along the pickling direction of the non-oriented silicon steel strip, the temperature of the acid liquor in the pickling tanks is 85 ℃, the pickling speed is 230m/min, and the flow rate of the acid liquor is 150m 3 And h, the concentration of the acid liquor in the 3 pickling tanks is gradually increased, so that the oxide skin and rusty materials on the surface of the steel strip can be effectively removed.
4) Trimming: the edge defects of the non-oriented silicon steel strip are cut off by using the disc shear in the edge cutting process, the side gap of the shear blade of the disc shear is set to be 0.25mm, the overlapping amount is set to be 0.4mm, the edge defects of the acid-washed steel strip can be effectively cut off, the smooth rolling of a rolling mill in the later period is ensured, and the same plate difference after the rolling is further reduced.
5) Continuous rolling: in the continuous rolling process, the reduction ratios of the first cold rolling mill, the second cold rolling mill, the third cold rolling mill, the fourth cold rolling mill and the fifth cold rolling mill are respectively 42 percent, 44 percent, 32 percent, 25 percent and 8 percent, and the unit tension between the first cold rolling mill and the second cold rolling mill is 130N/mm 2 The unit tension between the second and third cold rolling mills is 140N/mm 2 The unit tension between the third and fourth cold rolling mills is 160N/mm 2 The unit tension between the fourth and fifth cold rolling mills is 180N/mm 2 Along the rolling direction of the strip steel, the reduction rate of a cold rolling mill is gradually reduced, the unit tension is gradually increased, and the rolling rotting rate of the non-oriented silicon steel strip is 0.5%.
The emulsion is sprayed for lubrication and cooling in the continuous rolling process, the concentration of the emulsion in the first, second, third and fourth cold rolling mills is set to be 2.5%, the concentration of the emulsion in the fifth cold rolling mill is set to be 1.0%, and the concentration of the emulsion in the fifth cold rolling mill is less than that of the emulsion in the first, second, third and fourth cold rolling mills, so that the thermal expansion degree of the working roll can be effectively controlled before the strip steel is discharged from the rolling mill, and the flatness of the strip shape is better.
6) Coiling: the rolled steel strip was coiled at a set speed using a coiler.
By adopting the process, 11.3 minutes is consumed from uncoiling to pickling for medium and high grade non-oriented silicon steel with the thickness of 2.3mm, 8 minutes is consumed for rolling a roll of medium and high grade non-oriented silicon steel with the thickness of 0.35mm, 19.3 minutes is consumed from hot rolling to hard rolling, the production efficiency is greatly improved, and the yield of the edge cutting reaches 96.5-97%.
Example 4
In a five-stand six-roller cold continuous rolling mill used in the continuous rolling process, the chamfer heights of the working rollers of the first and second cold rolling mills are 0.7mm, the chamfer length is 320mm, the chamfer height of the working roller of the third cold rolling mill is 0.6mm and the chamfer length is 300mm, the chamfer heights of the working rollers of the first and second cold rolling mills are greater than the chamfer height of the working roller of the third cold rolling mill, and on the premise of avoiding strip breakage of the rolling mill, the edge thinning of the strip steel can be effectively controlled, so that the transverse same-plate difference of the non-oriented silicon steel strip is reduced, and after the strip steel passes through the structure of the working rollers of the continuous rolling mill and is rolled according to the process parameters of the embodiment 3, the average same-plate difference of the obtained rolled strip steel is 5 micrometers, the qualified rate of the transverse same-plate difference of less than or equal to 7 micrometers is 83-87%, and the qualified rate of the transverse same-plate difference of less than or equal to 10 micrometers is 96-98%.
Comparative example 1
Different from the embodiment 4, the chamfer height of the working rolls of the first and second cold rolling mills is 0.5mm, the chamfer length is 275mm, the chamfer height of the working roll of the third cold rolling mill is 0.3mm, and the chamfer length is 275mm, when the steel strip passes through the structure of the working roll of the continuous rolling mill described in the comparative example and is rolled under the process parameters of the embodiment 3, the average same plate difference of the obtained rolled steel strip is 8 μm, which is larger than the average same plate difference in the embodiment 4, the qualification rate of the transverse same plate difference less than or equal to 7 μm is 50%, the qualification rate of the transverse same plate difference less than or equal to 10 μm is 80%, and the strip shape quality of the rolled steel strip is reduced.
Comparative example 2
Different from the embodiment 4, the working rolls of the first, second and third cold rolling mills adopt flat rolls, and after rolling is carried out under the process parameters of the embodiment 3, the average same-plate difference of the obtained rolled steel strip is 12 microns, which is larger than that of the embodiment 4, the yield of the transverse same-plate difference is less than or equal to 7 microns is 30%, the yield of the transverse same-plate difference is less than or equal to 10 microns is 50%, and the strip shape quality of the rolled steel strip is reduced.
Comparative example 3
In contrast to example 3, the unit tension between the first and second cold rolling mills was 140N/mm2, the unit tension between the second and third cold rolling mills was 160N/mm2, and the unit tension between the third and fourth cold rolling mills was 200N/mm during the tandem rolling 2 The unit tension between the fourth and fifth cold rolling mills is 200N/mm 2 Along the rolling direction of the strip steel, the reduction rate of the cold rolling mill is gradually reduced, the unit tension is gradually increased, and the rolling rotting rate of the non-oriented silicon steel strip is 10 percent and is higher than that of the steel strip in the embodiment 3.
Comparative example 4
In contrast to example 3, the unit tension between the first and second cold rolling mills during continuous rolling was 80N/mm 2 The unit tension between the second and third cold rolling mills is 90N/mm 2 The unit tension between the third and fourth cold rolling mills is 100N/mm 2 The unit tension between the fourth and fifth cold rolling mills is 120N/mm 2 In the strip rolling direction, the reduction rate of the cold rolling mill is gradually reduced, the unit tension is gradually increased, and the rolling breakage rate of the non-oriented silicon steel strip is 50% and is higher than that of the steel strip in the embodiment 3.
Comparative example 5
Taking the rolling for producing the non-oriented silicon steel with the thickness of 0.35mm and the silicon content of 1.5-2.0 percent as an example, the process method for rolling by using the single stand is described in detail as follows:
the difference from example 3 is:
1) Welding: after the two coils of non-oriented silicon steel strips are welded end to end, secondary heating treatment is not carried out on a welding line area, the residual stress of the welding line is not eliminated, and the strip breakage accident is easy to happen.
2) Acid washing: the acid washing adopts push-pull type acid washing, the acid washing speed is 20-50m/min, and the speed is low. After the production is finished, the steel plate needs to be transported to a single-stand rolling mill for cold rolling, and the production period is longer.
3) Continuous rolling: reversible single-stand five-pass cold rolling is adopted, the adopted working rolls are flat rolls, the reduction ratios of the first pass, the second pass, the third pass, the fourth pass and the fifth pass are respectively 40 percent, 43 percent, 32 percent, 23 percent and 15 percent, and the unit tension ranges of the inlet side and the outlet side of the first pass, the second pass, the third pass, the fourth pass and the fifth pass are respectively 50-60N/mm 2 And 140-160N/mm 2 、80-100N/mm 2 And 170-190N/mm 2 、100-140N/mm 2 And 190-210N/mm 2 、140-160N/mm 2 And 210-230N/mm 2 、160-180N/mm 2 And 230-240N/mm 2 。
After the rolling process, the time for pickling a roll of 0.35mm thick medium-high grade non-oriented silicon steel is 35-40 minutes, the time for rolling a roll of 0.35mm thick medium-high grade non-oriented silicon steel by a single frame is 50-55 minutes, the time for rolling hard rolls from a hot roll to a cold roll is 85-95 minutes, the yield is low, the trimming yield is about 94.5%, the yield of the transverse equal plate difference of less than or equal to 7 mu m is 50%, and the yield of the transverse equal plate difference of less than or equal to 10 mu m is 75%, so that the requirements of high-end users cannot be met.
In conclusion, the cold continuous rolling process is improved and optimized, so that the rolling efficiency of the high-grade non-oriented silicon steel strip in the thin specification is improved, the qualification rate of the same plate difference is improved, and the strip breakage rate and the rolling breakage rate of rolling are reduced.
While the foregoing is directed to the principles of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (7)
1. A thin medium and high grade non-oriented silicon steel acid rolling production process is characterized in that the non-oriented silicon steel is sequentially subjected to the following steps of uncoiling, straightening, welding, pulling and straightening, acid washing, trimming, continuous rolling and coiling, wherein the thickness range of the thin medium and high grade non-oriented silicon steel is 0.3 to 0.35mm, and the silicon content range of the thin medium and high grade non-oriented silicon steel is 1.5 to 2.0 percent, and the thin medium and high grade non-oriented silicon steel acid rolling production process comprises the following steps of:
1) Preheating a welding seam before head and tail welding of a non-oriented silicon steel strip with the thickness of 2.3 to 2.5mm, after welding, heating a welding seam area for the first time, and after heating treatment for the first time, heating the welding seam area for the second time by using auxiliary heating equipment, wherein the temperature of the secondary post-heating is 500 to 600 ℃, and the heating time is 30 to 40s; welding the non-oriented silicon steel coil end to end by using a laser welding machine, wherein the welding speed is 3.6-4.2m/min, the welding power is 9.6-10.8KW, the preheating power is 15-22.5kW, and the heating power after the initial welding is 22.5-30kW;
2) In the continuous rolling process, a five-stand six-roller cold continuous rolling unit is adopted, wherein the working rollers on the first, second and third cold rolling mills all adopt chamfer rollers, the axial movement amount of the intermediate roller in the five-stand six-roller cold continuous rolling unit is 0, the reduction ratios of the first, second, third, fourth and fifth cold rolling mills are respectively 35-45%, 30-36%, 25-30% and 1-10%, and the unit tension between the first and second cold rolling mills is 120-130KN/mm 2 The unit tension between the second and third cold rolling mills is 130-140KN/mm 2 The unit tension between the third and fourth cold rolling mills is 150-160KN/mm 2 The unit tension between the fourth and fifth cold rolling mills is 160-180KN/mm 2 (ii) a The chamfering height of the working rolls on the first, second and third cold rolling mills is 0.6-0.8mm, and the chamfering length is 300-375mm;
after the non-oriented silicon steel is continuously rolled by the five-frame six-roller cold continuous rolling unit, the qualification rate of the transverse same-plate difference of less than or equal to 7 mu m is 83-87%, and the qualification rate of the transverse same-plate difference of less than or equal to 10 mu m is 96-98%.
2. The thin-gauge medium-high grade non-oriented silicon steel acid rolling production process as claimed in claim 1, wherein the chamfer angle height of the intermediate roll of the five-stand six-roll cold continuous rolling unit is 0.2 to 0.5mm, and the chamfer angle length is 50 to 100mm.
3. The thin-gauge high-grade non-oriented silicon steel acid rolling production process as claimed in claim 1, wherein the roughness of the working rolls of the first and second cold rolling mills is set to be 0.8 to 1.5 μm.
4. The thin-gauge medium-high grade non-oriented silicon steel acid rolling production process as claimed in claim 1, wherein an emulsion spray is used for lubrication and cooling in the continuous rolling process, the concentration of the emulsion in the first, second, third and fourth cold rolling mills is set to be 2.0% -2.5%, and the concentration of the emulsion in the fifth cold rolling mill is set to be 0.3% -1.0%.
5. The thin-gauge medium-high grade non-oriented silicon steel acid rolling production process as claimed in claim 1, wherein a two-bending one-straightening type tension leveler is used in the tension leveler, the tension leveler comprises a bending roller set I, a bending roller set II and a straightening roller set which are sequentially arranged along the straightening direction of the non-oriented silicon steel strip, the roll gap range of the bending roller set I is 20-25mm, the roll gap range of the bending roller set II is 15-22mm, the roll gap range of the straightening roller set is 10-15mm, and when the welding seam of the non-oriented silicon steel strip passes through the tension leveler, the tension leveler adopts a speed reduction and meshing reduction tension leveler mode.
6. The thin-gauge high-grade non-oriented silicon steel pickling and rolling production process as claimed in claim 1, wherein the number of pickling tanks used in the pickling process is 3, and along the pickling direction of the non-oriented silicon steel strip, the concentrations of acid liquor in the 3 pickling tanks are respectively set to be 60-80g/l, 100-130g/l and 160-180g/l, the temperature of the acid liquor in the pickling tanks is 75-85 ℃, the pickling speed is 200-230m/min, and the flow rate of the acid liquor is 110-150m 3 /h。
7. The thin-gauge medium-high-grade non-oriented silicon steel acid rolling production process as claimed in claim 1, wherein a circle shear is used in the edge cutting process to cut off edge defects of the non-oriented silicon steel strip, a shear edge side gap of the circle shear is set to be 0.15-0.25mm, an overlapping amount is set to be 0.3-0.4mm, and an edge cutting yield is 96.5% -97%.
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| CN114160577B (en) * | 2021-11-18 | 2023-06-23 | 山西太钢不锈钢股份有限公司 | Cold rolling method for improving thickness precision of ultrathin high-grade non-oriented silicon steel |
| CN114833195A (en) * | 2022-03-28 | 2022-08-02 | 武汉钢铁有限公司 | Cold rolling method for producing high-grade non-oriented silicon steel based on UCMW cold continuous rolling mill |
| CN114733912B (en) * | 2022-05-13 | 2023-10-27 | 张家港扬子江冷轧板有限公司 | Cold rolling method of non-oriented silicon steel and non-oriented silicon steel |
| CN115055918B (en) * | 2022-06-17 | 2023-09-19 | 首钢智新迁安电磁材料有限公司 | Continuous rolling method of non-oriented silicon steel |
| CN115740049B (en) * | 2022-11-17 | 2023-09-15 | 首钢智新迁安电磁材料有限公司 | Silicon steel cold continuous rolling lubrication system and method |
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