CN113751517B - Control method for improving cold rolling strip breakage of high-grade non-oriented silicon steel - Google Patents
Control method for improving cold rolling strip breakage of high-grade non-oriented silicon steel Download PDFInfo
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- CN113751517B CN113751517B CN202111069865.XA CN202111069865A CN113751517B CN 113751517 B CN113751517 B CN 113751517B CN 202111069865 A CN202111069865 A CN 202111069865A CN 113751517 B CN113751517 B CN 113751517B
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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
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
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Abstract
The invention relates to a non-oriented silicon steel technologyThe technical field especially relates to a control method for improving cold rolling strip breakage of high-grade non-oriented silicon steel. The weight percentages are as follows: [ Si+Al ]]More than or equal to 4.0 percent; the Mn and S contents satisfy the following: s is less than or equal to 0.0015, [ Mn ]]/[S]200 to 400 percent; 1) During the hot rolling, a heat preservation cover is used, the edge is put into heating during hot rolling, and the coiling temperature in the head and tail 100 meters is increased by 15-30 ℃; 2) A heating device is added before edge cutting of the edge is carried out on the disc shear of the normalizing unit, a burr polishing device is added after cutting, and gas open fire heating is adopted to ensure that the temperature of the steel plate is above the ductile-brittle transition temperature; 3) The clearance of the disc shear meets the relation: d, d s ＝(0.15～0.45)d 0 ds, clearance of disc shears, mum; d, d 0 Normalizing the plate thickness to be mm; 4) The normalizing adopts rapid heating, the heating speed of the preheating section of the steel belt is controlled to be 320-380 ℃/min, and the unit speed is controlled to be 20-30 m/min; 5) After the normalizing process, the grain ratio of the edge smaller than 20 μm is controlled within 5%. Effectively reduces the occurrence of cold rolling broken belts, improves the yield by more than 1.30 percent, and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of non-oriented silicon steel, in particular to a control method for improving cold rolling strip breakage of high-grade non-oriented silicon steel.
Background
The high-grade non-oriented silicon steel product is widely applied to manufacturing of high-precision and sharp motors and instrument and meter iron cores, and is an important metal functional soft magnetic material.
As the silicon content increases, the brittleness becomes larger, the breakage rate increases, and particularly, in the cold rolling process of high-grade products with the (silicon+aluminum) content exceeding 4.0%, the brittleness of the material itself and the problem of edge defects of the strip steel cause frequent breakage of the strip in the cold rolling process. Although water bath heating is conventionally carried out before the cold rolling of the high-silicon product, and ageing rolling is matched, so that the strip steel is rolled at a strip temperature, mixed crystals often appear due to uneven structure of the edge of a hot rolled plate, or the shearing blade gap of a circle shear is excessively adjusted during normalizing, so that the shearing component force of an upper blade on the outer side of the edge of the high-grade silicon strip steel is increased, the edge of the strip steel is excessively bent and deformed, and the broken strip of the shearing edge part which does not reach the yield limit generates stress concentration at the edge of the circle shear, so that the broken strip is finally caused to have microcracks and pits. The existence of microcracks, pits and hardening layers in the fracture zone is easy to generate stress concentration in the rolling process, so that the fracture zone becomes a new cracking source, the fracture is expanded transversely along the strip steel under the action of tension to generate brittle fracture, frequent repeated fracture can cause the surface temperature of the strip steel to be reduced (plus the influence of ambient temperature is more obvious in winter), the brittleness is increased, the production is sometimes forced to be suspended, the reheating is carried out, the yield is reduced, the cost is increased, and the working strength is increased.
CN201010562032.2 discloses a cold rolling method for preventing strip breakage of high silicon strip steel, mainly aiming at silicon steel with silicon content greater than 2.3%, adopting a mode of controlling strip steel front-back tension, each pass reduction rate and emulsion flow to reduce strip breakage from head to tail; however, it has little effect on silicon steel with silicon content greater than 3.0%. CN201610487428.2 discloses a processing method for inhibiting edge cracking during rolling of brittle materials, which aims at connecting two sides of a material with a certain strength and a shaping material with the brittle edge cracked during rolling, and strengthening the processing capacity of the edge to obtain an alloy sheet with good surface and no edge cracking. This technology is advanced but difficult to implement in mass production. CN201410644651.4 discloses a method for controlling cold rolling edge cracking after normalizing high magnetic induction oriented silicon steel, mainly controlling normalized spray nozzles to realize cross cooling, and cooling the edge of strip steel within 30mm without spraying water.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a control method for improving cold rolling strip breakage of high-grade non-oriented silicon steel. Effectively reduces the occurrence of cold rolling broken belts, improves the yield by more than 1.30 percent, and reduces the production cost.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the control method for improving the cold rolling strip breakage of the high-grade non-oriented silicon steel is suitable for the production process of the high-grade cold rolling non-oriented silicon steel which needs normalizing treatment;
the cold-rolled non-oriented silicon steel comprises the following components in percentage by weight: [ Si+Al ] is not less than 4.0%; the Mn and S contents satisfy the following: s is less than or equal to 0.0015,
[Mn]/[S]:200～400；
the method specifically comprises the following steps:
1) A, a heat preservation cover is used in the hot rolling process, B, edge heating is carried out in the hot rolling process, C, the coiling temperature in the head and tail 100 meters is increased by 15-30 ℃;
2) A heating device is added before edge shearing of the edge is carried out on the disc shear of the normalizing unit, a burr polishing device is added after shearing, and gas open fire heating is adopted, so that the temperature of the steel plate is ensured to be above the ductile-brittle transition temperature, namely, the fracture appearance is characterized in that more than 50% of the fracture appearance is ductile;
3) The clearance of the disc shear meets the relation:
d s ＝(0.15～0.45)d 0
wherein:
ds is the clearance of the disc shear, mum;
d 0 the thickness of the plate is normalized, and the thickness is mm;
4) The normalizing adopts rapid heating, the heating section comprises a preheating section and a soaking section, the heating speed of the preheating section of the steel belt is controlled to be 320-380 ℃/min, and the unit speed is controlled to be 20-30 m/min;
5) After the normalizing process, the grain ratio of the edge smaller than 20 μm is controlled within 5%.
The lap joint amount of the disc shear in the step 3) is 300-400 mm.
The temperature of the soaking section in the step 4) is 930-980 ℃.
Compared with the prior art, the method has the beneficial effects that:
the invention is suitable for the production of cold-rolled non-oriented silicon steel products with the (Si+Al) content of more than 4.0 percent, and the cold-rolled non-oriented silicon steel products are put into edge heating during hot rolling, and the curling temperature compensation is carried out within 100 meters from the head to the tail, so that the mixed crystals at the edge are reduced, and the aim of uniform structure is achieved. The heating device is added before the disc shear of the normalizing unit, and meanwhile, the gap between the disc shear and the strip steel is adjusted, so that the extrusion and bending force is improved, the vertical shearing force is improved, a proper cutting layer is obtained, the purpose of eliminating or reducing microcracks is achieved, and the edge shearing quality is improved. And a small amount of generated crack sources are ensured to be induced under the premise of plastic deformation, if the crack is expanded, the front edge area of the crack can generate obvious plastic deformation, so that the effective surface energy is increased, and the crack expansion is stopped, thereby reducing the occurrence of cold rolling broken strips and ensuring the stable and smooth cold rolling process.
The invention effectively reduces the occurrence of cold rolling broken belts, improves the yield by more than 1.30 percent and reduces the production cost.
Detailed Description
The following detailed description of the invention is further illustrative, but is not intended to limit the scope of the invention:
a control method for improving cold rolling strip breakage of high-grade non-oriented silicon steel specifically comprises the following steps:
1. the Mn and S weight percentage contents in the component design satisfy the following conditions: s is less than or equal to 0.0015, [ Mn ]/[ S ]:200-400, the edge segregation of the S element is reduced, and edge crack is effectively improved.
2. The edge is put into heating during hot rolling, and the coiling temperature is increased by 15-30 ℃ in 100 m at the head and tail.
3. The heating device added before the standardized trimming is put into use when cold-rolled non-oriented silicon steel with the weight percentage content of (Si+Al) being more than 4.0 percent is produced, and the heating device is heated by adopting gas open fire, so that the temperature of the steel plate is ensured to be above the ductile-brittle transition temperature, namely, more than 50 percent of the fracture morphology is characterized by ductile fracture.
4. The clearance of the disc shear meets the relation:
d s ＝(0.15～0.45)d 0
ds, clearance of disc shears, mum;
d0, normalizing the plate thickness, and mm.
The overlap joint amount of the disc shear meets 300-400 mm.
5. The rapid heating is adopted for normalization, the heating speed of a preheating section of the steel belt is controlled to be 320-380 ℃/min, the unit speed is controlled to be 20-30 m/min, the temperature of a soaking section is 930-980 ℃, mixed crystals are reduced, and the grain ratio of the edge part smaller than 20 mu m is controlled to be within 5%.
According to the invention, a heat preservation cover is used in the hot rolling process and temperature compensation is carried out on the head and the tail, a heating device is added before edge shearing is carried out on the disc shear of the normalizing unit, a burr polishing device is added after shearing, the temperature of a steel plate is ensured to be above the brittle transition temperature during edge shearing, so that the toughness fracture occurs during edge shearing of strip steel, meanwhile, the gap of the shearing edge of the disc shear is adjusted, and the tiny cracks or micro crack sources formed after edge shearing are reduced, so that the occurrence of cold rolling broken strip is reduced.
The invention is suitable for the production of cold-rolled non-oriented silicon steel products with the weight percentage content of (Si+Al) being more than 4.0 percent, and the purpose of uniform structure is achieved by putting the cold-rolled non-oriented silicon steel products into edge heating during hot rolling and performing crimping temperature compensation within 100 meters from the head to the tail and reducing edge mixed crystals.
Since the side portion of the hot rolled silicon steel sheet having a mixed crystal structure is subjected to cold rolling deformation, the yield strength of coarse grains is low, yielding will be generated first, dislocation in the grains will start to slip, and fine grains having a high yield strength have not yet started to slip. The resulting dyssynchrony in coarse and fine grain deformation induces additional stress and stress concentration between grains, whereby the coarse grains develop cracks in advance. The heating device is added before the disc shear of the normalizing unit, and meanwhile, the gap between the disc shear and the strip steel is adjusted, so that the extrusion and bending force is improved, the vertical shearing force is improved, a proper cutting layer is obtained, the purpose of eliminating or reducing microcracks is achieved, and the edge shearing quality is improved.
And a small amount of generated crack sources are ensured to be induced under the premise of plastic deformation, if the crack is expanded, the front edge area of the crack can generate obvious plastic deformation, so that the effective surface energy is increased, and the crack expansion is stopped, thereby reducing the occurrence of cold rolling broken strips and ensuring the stable and smooth cold rolling process.
[ example ]
The main components of the examples are shown in Table 1, and the balance is iron and unavoidable impurity elements.
Table 1 Main chemical Components (wt%) of examples
| Composition of the components | C | Si | Mn | P | S | Als | N |
| Example 1 | 0.0022 | 3.25 | 0.30 | 0.010 | 0.0015 | 0.83 | 0.0019 |
| Example 2 | 0.0021 | 2.98 | 0.28 | 0.011 | 0.0008 | 1.06 | 0.0021 |
| Example 3 | 0.0024 | 3.15 | 0.32 | 0.009 | 0.0010 | 0.95 | 0.0022 |
The main control techniques of the respective examples are shown in table 2.
TABLE 2 Main control technique
The effect of the implementation is shown in Table 3.
TABLE 3 effect of implementation
| Yield improvement% | |
| Example 1 | 1.31 |
| Implementation of the embodimentsExample 2 | 1.52 |
| Example 3 | 1.60 |
The invention effectively reduces the occurrence of cold rolling broken belts, improves the yield by more than 1.30 percent and reduces the production cost.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (1)
1. The control method for improving the cold rolling strip breakage of the high-grade non-oriented silicon steel is characterized by being suitable for the production process of the high-grade cold rolling non-oriented silicon steel which needs normalizing treatment;
the cold-rolled non-oriented silicon steel comprises the following components in percentage by weight: [ Si+Al ] is not less than 4.0%; the Mn and S contents satisfy the following: s is less than or equal to 0.0015,
[Mn]/[S]:200～400；
the method specifically comprises the following steps:
1) A, a heat preservation cover is used in the hot rolling process, B, edge heating is carried out in the hot rolling process, C, the coiling temperature in the head and tail 100 meters is increased by 15-30 ℃;
2) A heating device is added before edge shearing of the edge is carried out on the disc shear of the normalizing unit, a burr polishing device is added after shearing, and gas open fire heating is adopted, so that the temperature of the steel plate is ensured to be above the ductile-brittle transition temperature, namely, the fracture appearance is characterized in that more than 50% of the fracture appearance is ductile;
3) The clearance of the disc shear meets the relation:
d s ＝(0.15～0.45)d 0
wherein:
ds is the clearance of the disc shear, mum;
d 0 the thickness of the plate is normalized, and the thickness is mm;
the lap joint amount of the disc shear is 300-400 mm;
4) The normalizing adopts rapid heating, the heating section comprises a preheating section and a soaking section, the heating speed of the preheating section of the steel belt is controlled to be 320-380 ℃/min, and the unit speed is controlled to be 20-30 m/min;
5) After the normalizing process, the grain ratio of the edge smaller than 20 μm is controlled within 5%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0576903A (en) * | 1991-09-19 | 1993-03-30 | Kawasaki Steel Corp | Method for preventing edge crack in cold rolling of silicon steel sheet |
| CN102367547B (en) * | 2011-10-31 | 2013-03-13 | 山西太钢不锈钢股份有限公司 | Manufacture method of high-silicon aluminum content non-oriented silicon steel strip |
| CN107626745A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | It is a kind of to be used to control the method that strip edge splits |
| CN107626971B (en) * | 2016-07-18 | 2020-02-18 | 鞍钢股份有限公司 | Method for reducing edge shearing amount of strip steel |
| CN108655173B (en) * | 2018-05-11 | 2019-10-29 | 鞍钢股份有限公司 | A kind of non-oriented high grade silicon steel milling method |
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