CN109622619B - Method for producing high-grade non-oriented electrical steel by cold continuous rolling and product thereof - Google Patents
Method for producing high-grade non-oriented electrical steel by cold continuous rolling and product thereof Download PDFInfo
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- CN109622619B CN109622619B CN201811614347.XA CN201811614347A CN109622619B CN 109622619 B CN109622619 B CN 109622619B CN 201811614347 A CN201811614347 A CN 201811614347A CN 109622619 B CN109622619 B CN 109622619B
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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
- B21B1/40—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 foils which present special problems, e.g. because of thinness
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
Abstract
The invention discloses a method for producing high-grade non-oriented electrical steel by cold continuous rolling and a product thereof, wherein the method comprises the steps of heating strip steel to 80-100 ℃ before a cold rolling inlet, heating the strip steel again to 100-120 ℃ at the cold rolling inlet, and cold rolling equipment adopts an eighteen-roller six-rack cold continuous rolling unit for cold rolling. The production efficiency is high, the strip steel raw material is brittle at room temperature and has edge cracks, so that the strip steel is easy to break in a region with larger tension during cold rolling, the strip steel is heated before the cold rolling to reduce the brittleness, the strip breakage probability of the strip steel at the cold rolling inlet section is reduced, the outlet speed of the strip steel at the outlet end of an eighteen-roller six-rack cold continuous rolling unit can reach 800m/mi1n at most, and the thickness of the obtained product can be below 0.27 mm.
Description
Technical Field
The invention belongs to the technical field of cold continuous rolling of non-oriented electrical steel, and particularly relates to a method for producing high-grade non-oriented electrical steel with the thickness of less than or equal to 0.27mm by cold continuous rolling.
Background
At present, the main processes of cold rolling of the non-oriented electrical steel comprise a normalized pickling process, a cold rolling process, a decarburization annealing process, a trimming and coiling process and a packaging and subpackaging process, wherein the cold rolling process is mainly used for determining the thickness of the electrical steel, the thin high-grade non-oriented electrical steel is widely applied to manufacturing of large motors, reactors, magnetic amplifiers, small power transformers, compressor motors, automobile motors and the like, the annual output of the domestic cold rolling high-grade non-oriented electrical steel can only meet the apparent demand of about 15%, and a large number of energy-saving and efficient products need to be imported. Because the high-grade non-oriented electrical steel has high silicon content (2.8-3.5 percent), the deformation resistance is large and the strip steel edge cracks during cold rolling, and meanwhile, the thickness of the strip steel needs to be reduced to reduce the high-frequency iron loss, the prior art can only stably produce the high-grade non-oriented electrical steel with the thickness of more than 0.27mm, and a stable production method for thin products with the thickness of 0.25mm and 0.2mm, which are urgently needed in the market, does not exist. Although the existing twenty-roller reversible single-stand rolling mill can realize the production of thin-gauge high-grade non-oriented electrical steel, the defects of low production efficiency and low yield caused by frequent roller change and more plate shape defects cannot be overcome. If a UCMW six-roller continuous rolling mill is adopted for production, the problem of strip breakage is caused by edge crack caused by overlarge rolling force due to the large diameter of a working roller of the mill, and the machine type cannot realize high-speed stable production of thin-specification (less than 0.27mm) high-grade non-oriented electrical steel.
Disclosure of Invention
In order to solve the technical problems, one of the objectives of the present invention is to provide a method for producing high-grade non-oriented electrical steel by cold continuous rolling, wherein the thickness of the finished product is less than or equal to 0.27mm, and the production efficiency of the method is high.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for producing high-grade non-oriented electrical steel by cold continuous rolling adopts an eighteen-roller six-rack cold continuous rolling mill group to cold-roll strip steel, wherein the strip steel is heated to 80-100 ℃ before a cold-rolling inlet, and the strip steel is heated again to 100-120 ℃ at a cold-rolling inlet section.
The beneficial effects of the above technical scheme are that: the production efficiency is high, the strip steel raw material is brittle at room temperature and has edge cracks, so that the strip steel is easy to break in a region with larger tension during cold rolling, the strip steel is heated before the cold rolling to reduce the brittleness, the strip breakage probability of the strip steel at the cold rolling inlet section is reduced, and the outlet speed of the strip steel at the outlet end of an eighteen-roller six-rack cold continuous rolling unit can reach 800m/min at most.
According to the technical scheme, the electromagnetic induction heating devices are adopted to heat the strip steel in the front and the inlet sections of the cold rolling inlet.
The beneficial effects of the above technical scheme are that: the heating is convenient, the heating efficiency is high, the occupied area is small, the temperature control precision is high, and the pollution to the strip steel is avoided.
The diameter of the working roll of the eighteen-roll six-stand cold continuous rolling unit in the technical scheme is 140-170 mm.
The beneficial effects of the above technical scheme are that: the structure is simple.
In the technical scheme, each group of vertically opposite two working rolls in the first frame and the second frame in the eighteen-roller six-frame cold continuous rolling unit are antisymmetric single-taper rolls.
The beneficial effects of the above technical scheme are that: is convenient for effectively controlling the thinning of the edge of the strip steel.
The taper of the single-taper roller in the technical scheme is 1/200-1/600.
The beneficial effects of the above technical scheme are that: the structure is simple, and the reduction control of the edge of the strip steel can be more effectively carried out.
In the technical scheme, the surface roughness Ra of the working rolls on the first frame to the fourth frame in the eighteen-roller six-frame cold continuous rolling unit is 0.8-1.0 mu m, and the surface roughness Ra of the working rolls on the fifth frame to the sixth frame is 0.4-0.5 mu m.
The beneficial effects of the above technical scheme are that: the surface of the cold continuous rolled strip steel is smoother.
In the technical scheme, the working roll is made of D2 material, and the hardness of the working roll is HRC 60-62.
The beneficial effects of the above technical scheme are that: it has better wear resistance and moderate toughness.
In the technical scheme, the eighteen-roller six-stand cold continuous rolling unit adopts emulsion to perform process lubrication and cooling in the rolling process, so that the temperature of the strip steel at the outlet of the first stand to the fifth stand is 150-; the temperature of the strip steel at the outlet of the sixth stand is 80-150 ℃.
The beneficial effects of the above technical scheme are that: the temperature of the strip steel is controllable, and the post annealing is convenient.
In the technical scheme, the rolling reduction of the first frame in the eighteen-roller six-frame cold continuous rolling unit is 35-37.5%, the rolling reduction of the second frame is 32-34.5%, the rolling reduction of the third frame is 30-33.5%, the rolling reduction of the fourth frame is 28-33%, the rolling reduction of the fifth frame is 27-31%, and the rolling reduction of the sixth frame is 16-28%.
The beneficial effects of the above technical scheme are that: the thickness of the strip steel is gradually reduced, so that the strip steel is thinned without influencing the integrity of the strip steel.
The second purpose of the present invention is to provide an electrical steel made by the above method for producing high grade non-oriented electrical steel by cold continuous rolling, the thickness of which can be less than 0.27 mm.
Detailed Description
Example 1:
the method for producing the high-grade non-oriented electrical steel by cold continuous rolling comprises the following steps of cold rolling a hot rolled coil with the silicon content of 3.1 percent and the thickness of 2.0mm to produce the high-grade non-oriented electrical steel with the finished product thickness of 0.2mm and the width of 1220mm, wherein the cold continuous rolling process comprises the following steps:
in the entrance section, the hot-rolled coil subjected to normalized pickling is uncoiled by a double uncoiler in turn to be alternatively uncoiled to be strip steel and welded by a laser welder (for welding the strip tail and the strip head of the previous strip steel and the next strip steel into a whole), and the temperature of the strip steel is increased to 80-100 ℃ from room temperature by an electromagnetic induction strip steel heating device before the entrance of cold continuous rolling equipment, preferably 85-95 ℃; the strip steel passes through the inlet loop and then passes through the electromagnetic induction heating device, the temperature of the strip steel is increased to 120 ℃ for 100-;
in the mill section, the diameter of the working roll of the eighteen-roll six-stand cold continuous rolling mill set is 140-170mm, preferably 160mm, the length of the roll body is preferably 1450mm, and the material is D2 material with the hardness of HRC60-62, wherein the surface roughness Ra of the working roll of the first stand to the fourth stand in the eighteen-roll six-stand cold continuous rolling mill set is 0.8-1.0 μm, the surface roughness Ra of the working roll of the fifth stand to the sixth stand is 0.4-0.5 μm, preferably, the surface roughness Ra of the working roll of the first stand to the sixth stand is 1.0 μm, 0.98 μm, 0.95 μm, 0.9 μm, 0.5 μm and 0.4 μm respectively; the continuous cold rolling method is adopted by an eighteen-roller six-rack continuous cold rolling unit for cold continuous rolling, the reduction rate of a first rack in the eighteen-roller six-rack continuous cold rolling unit is 35-37.5%, the reduction rate of a second rack is 32-34.5%, the reduction rate of a third rack is 30-33.5%, the reduction rate of a fourth rack is 28-33%, the reduction rate of a fifth rack is 27-31%, the reduction rate of a sixth rack is 16-28%, preferably, the reduction rates of the first rack to the sixth rack are respectively 36%, 33.5%, 32.5%, 31.8%, 29.7% and 26.8%, so that the total reduction rate is 90%;
the flow rates of the emulsion of the first to fourth stands are respectively controlled at 4000-; the outlets of the first rack to the sixth rack are all provided with a plate temperature meter to measure the temperature of the strip steel, so that the flow of the emulsion is accurately controlled, and the temperature of the strip steel at the outlets of the first rack to the fifth rack is 150-; the temperature of the strip steel at the outlet of the sixth rack is 80-150 ℃, preferably, the temperature of the strip steel at the outlet of the first rack to the outlet of the sixth rack is respectively controlled at 153 ℃, 204 ℃, 233 ℃, 230 ℃, 203 ℃ and 105 ℃;
the edge thinning control of the strip steel is carried out in the rolling process, the tapers of the working rolls of the first frame and the second frame are 1/200 (the taper length is 200mm) and 1/400 (the taper length is 250mm), and the sectional cooling of the emulsion of the sixth frame automatically controls the thermal convexity of the working rolls; and coiling the cold continuous rolled strip steel at an outlet section of the sixth stand.
The plate shape value of the 0.2mm high-grade non-oriented electrical steel after cold rolling according to the process is controlled within 8I, the same plate difference is within 5.0 mu m, no strip breakage accident and no plate shape quality defect occur in the production process, and the product quality is good.
Example 2:
the difference from the example 1 is that the cold continuous rolling is carried out by adopting a one-time cold rolling method, the reduction ratios of the first sixth stand are respectively 37.5%, 34.5%, 33.5%, 32.8%, 30.8% and 27.8%, and the total reduction ratio is 90.9%; the strip steel temperatures at the outlets of the first frame and the sixth frame are respectively 154 ℃, 206 ℃, 235 ℃, 205 ℃ and 105 ℃; the plate shape value of the 0.2mm high-grade non-oriented electrical steel after cold rolling according to the process is controlled within 8I, the same plate difference is within 5.0 mu m, no strip breakage accident and no plate shape quality defect occur in the production process, and the product quality is good.
The arrangement sequence of the first frame to the sixth frame in the eighteen-roller six-frame cold continuous rolling unit is consistent with the traveling direction of the strip steel.
The edge thinning control in the rolling process is realized by configuring a convexity detector at the inlet of an eighteen-roller six-stand cold continuous rolling unit, configuring a side descending instrument at the outlet of the eighteen-roller six-stand cold continuous rolling unit, and configuring a plate type instrument at the outlet of a first stand to a sixth stand so as to match the thermal convexity control of a tapered working roller of the first stand and a tapered working roller of the second stand and the thermal convexity control of the working roller of the sixth stand, thereby realizing the feedforward and feedback control of the strip steel edge descending.
The novel eighteen-roller six-continuous rolling is adopted to carry out the cold continuous rolling production of the high-grade non-oriented electrical steel with the finished product thickness of less than or equal to 0.27mm, because the eighteen-roller rolling mill can realize continuous rolling, compared with a twenty-roller reversible single frame, the rollers are not required to be frequently changed, the diameter of the working roller of the eighteen-roller rolling mill is 140-170mm, and compared with the diameter of the working roller of the twenty-roller rolling mill of 60-85mm, the large roller diameter of the eighteen-roller rolling mill has better control on the strip shape quality in the cold rolling process. For the rolling schedule that the thickness of the high-grade non-oriented electrical steel hot rolling raw material is rolled from 2.2mm to 0.2mm and the reduction rate is as high as 90.9 percent, the diameter of the working roll of the conventional six-roll continuous rolling mill is 320mm, the reliable and stable production is difficult due to the limitation of the contact stress between the rolls and the risk that the strip steel edge part is broken after the upper working roll and the lower working roll are contacted, and the problem can be effectively solved by the small roll diameter of an eighteen-roll rolling mill. In addition, the working rolls on the first frame and the second frame of the eighteen-roller six-frame cold continuous rolling unit have antisymmetric single-taper roll shapes, and are matched with the online reasonably-configured detectors and the thermal crown control of the working rolls, so that the defect that the strip steel is shifted due to the tapered working rolls to control the strip steel edge drop compared with a UCMW six-roller rolling mill is overcome.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art should be able to cover the method scheme and the equivalent variations of the concept of the present invention within the scope of the method disclosed in the present invention.
Claims (4)
1. A method for producing high-grade non-oriented electrical steel by cold continuous rolling is characterized in that a cold continuous rolling unit with eighteen rollers and six racks is adopted to cold-roll strip steel, wherein the strip steel is heated to 80-100 ℃ before a cold-rolling inlet, and the strip steel is heated again to 100-120 ℃ at a cold-rolling inlet section; the diameter of the working roll of the eighteen-roll six-stand cold continuous rolling unit is 140-170 mm; each group of two vertically opposite working rolls in the first frame and the second frame in the eighteen-roller six-frame cold continuous rolling unit are antisymmetric single-taper rolls; the taper of the single-taper roller is 1/200-1/600; the surface roughness Ra of the working rolls on the first frame to the fourth frame in the eighteen-roller six-frame cold continuous rolling unit is 0.8-1.0 mu m, and the surface roughness Ra of the working rolls on the fifth frame to the sixth frame is 0.4-0.5 mu m; the eighteen-roller six-rack cold continuous rolling unit adopts emulsion to perform process lubrication and cooling in the rolling process, so that the temperature of the strip steel at the outlet of the first rack to the fifth rack is 150-; the temperature of the strip steel at the outlet of the sixth rack is 80-150 ℃; in the eighteen-roller six-rack cold continuous rolling unit, the reduction rate of a first rack is 35-37.5%, the reduction rate of a second rack is 32-34.5%, the reduction rate of a third rack is 30-33.5%, the reduction rate of a fourth rack is 28-33%, the reduction rate of a fifth rack is 27-31%, and the reduction rate of a sixth rack is 16-28%.
2. The method of claim 1, wherein the strip steel is heated by electromagnetic induction heating means before and during the cold rolling entry.
3. The method for producing high grade nonoriented electrical steel by cold continuous rolling as claimed in claim 1 wherein said work rolls are D2 material with hardness HRC 60-62.
4. An electrical steel produced by the method for producing a high grade nonoriented electrical steel by cold continuous rolling according to any one of claims 1 to 3.
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| CN201811614347.XA CN109622619B (en) | 2018-12-27 | 2018-12-27 | Method for producing high-grade non-oriented electrical steel by cold continuous rolling and product thereof |
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| CN201811614347.XA CN109622619B (en) | 2018-12-27 | 2018-12-27 | Method for producing high-grade non-oriented electrical steel by cold continuous rolling and product thereof |
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| CN109622619B true CN109622619B (en) | 2020-07-07 |
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| CN113000606B (en) * | 2021-02-23 | 2022-05-24 | 马鞍山钢铁股份有限公司 | Method for stably producing high-grade non-oriented electrical steel in batches |
| CN113198866B (en) * | 2021-05-07 | 2023-03-17 | 新余钢铁股份有限公司 | Thin-gauge middle-high-grade non-oriented silicon steel acid rolling production process |
| CN116060454B (en) * | 2023-03-23 | 2023-06-30 | 首钢智新迁安电磁材料有限公司 | Cold continuous rolling temperature control method for electrical steel |
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| JPH1046248A (en) * | 1996-07-25 | 1998-02-17 | Nippon Steel Corp | Production of nonoriented magnetic steel sheet high in magnetic flux density and low in core loss |
| CN101745794A (en) * | 2008-12-15 | 2010-06-23 | 鞍钢股份有限公司 | Preparation technology of non-oriented high grade silicon steel |
| CN102476131A (en) * | 2010-11-26 | 2012-05-30 | 宝山钢铁股份有限公司 | Cold rolling method for preventing high-silicon strip steel from being broken |
| CN102886382A (en) * | 2012-10-15 | 2013-01-23 | 中国重型机械研究院股份公司 | Eighteen-roller rolling mill structure |
| CN103394527A (en) * | 2013-08-02 | 2013-11-20 | 河北省首钢迁安钢铁有限责任公司 | Method for improving yield of rolled high-silicon non-oriented electrical steel |
| CN103464469A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Edge drop control method of cold-rolled non-oriented silicon steel |
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- 2018-12-27 CN CN201811614347.XA patent/CN109622619B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1046248A (en) * | 1996-07-25 | 1998-02-17 | Nippon Steel Corp | Production of nonoriented magnetic steel sheet high in magnetic flux density and low in core loss |
| CN101745794A (en) * | 2008-12-15 | 2010-06-23 | 鞍钢股份有限公司 | Preparation technology of non-oriented high grade silicon steel |
| CN102476131A (en) * | 2010-11-26 | 2012-05-30 | 宝山钢铁股份有限公司 | Cold rolling method for preventing high-silicon strip steel from being broken |
| CN102886382A (en) * | 2012-10-15 | 2013-01-23 | 中国重型机械研究院股份公司 | Eighteen-roller rolling mill structure |
| CN103394527A (en) * | 2013-08-02 | 2013-11-20 | 河北省首钢迁安钢铁有限责任公司 | Method for improving yield of rolled high-silicon non-oriented electrical steel |
| CN103464469A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Edge drop control method of cold-rolled non-oriented silicon steel |
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