CN112122345B - Rolling method of special steel type mixed casting blank - Google Patents
Rolling method of special steel type mixed casting blank Download PDFInfo
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- CN112122345B CN112122345B CN202010900772.6A CN202010900772A CN112122345B CN 112122345 B CN112122345 B CN 112122345B CN 202010900772 A CN202010900772 A CN 202010900772A CN 112122345 B CN112122345 B CN 112122345B
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- 238000000034 method Methods 0.000 title claims abstract description 107
- 238000005096 rolling process Methods 0.000 title claims abstract description 90
- 238000005266 casting Methods 0.000 title claims abstract description 86
- 239000002436 steel type Substances 0.000 title claims abstract description 80
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 122
- 239000010959 steel Substances 0.000 claims abstract description 122
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 78
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000010703 silicon Substances 0.000 claims abstract description 77
- 238000005097 cold rolling Methods 0.000 claims description 56
- 239000002253 acid Substances 0.000 claims description 39
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 20
- 238000005554 pickling Methods 0.000 claims description 19
- 238000004140 cleaning Methods 0.000 claims description 17
- 238000005406 washing Methods 0.000 claims description 17
- 238000005098 hot rolling Methods 0.000 claims description 10
- 230000002441 reversible effect Effects 0.000 claims description 7
- 238000009966 trimming Methods 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 description 15
- 239000000956 alloy Substances 0.000 description 15
- 238000005336 cracking Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000009749 continuous casting Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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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
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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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Abstract
The invention discloses a rolling method of a different steel type mixed casting blank, which is suitable for rolling the mixed casting blank of a first steel type and a second steel type with different steel type components, and comprises the following steps: determining the interval content of silicon elements of the first steel grade and the second steel grade; and determining the rolling process that the mixed casting blanks of the first steel type and the second steel type enter working rolls with different roll shifting amounts according to the determined interval content of the silicon element of the first steel type and the second steel type. The mixed casting billet is rolled by adopting the rolling method of the mixed casting billet of the different steel type, so that the problem of strip breakage in the rolling process can be avoided.
Description
Technical Field
The invention belongs to the technical field of rolling, and particularly relates to a rolling method of a dissimilar steel type mixed casting blank.
Background
The continuous casting machine realizes continuous casting of different steel types when casting steel types with different chemical compositions, can effectively reduce the production waiting time, increase the casting time of the continuous casting machine, improve the operation capacity of the continuous casting machine, and can meet the production of small-batch variety steel at low cost.
The non-oriented silicon steel with different grades has different silicon element contents, when two furnaces of steel with different silicon element contents are continuously cast, a mixed casting blank can appear, and when the mixed casting blank is rolled, the rolling process of the non-oriented silicon steel with lower silicon content is adopted at present, but the strip breakage problem often appears in the rolling process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a rolling method of a mixed blank of different steel types, which aims to solve the problem of strip breakage in the rolling process in the prior art.
The invention realizes the purpose through the following technical scheme:
a rolling method of a mixed casting blank of different steel types is suitable for rolling the mixed casting blank of a first steel type and a second steel type which have different steel types and compositions, and comprises the following steps,
determining the interval content of silicon elements of the first steel grade and the second steel grade;
according to the determined interval content of the silicon element of the first steel grade and the second steel grade, determining that the mixed casting blank of the first steel grade and the second steel grade enters a rolling process with different roll shifting amounts of working rolls;
further, the air conditioner is provided with a fan,
when the content of Si element intervals of the first steel grade and the second steel grade is less than or equal to 1.2 percent, the rolling process is a first process, and the roll shifting amount of a working roll of the first process is controlled to be-95-70 mm;
when the silicon element content of the first steel grade and the second steel grade is more than or equal to 1.2% and less than or equal to 1.8%, if the rolling process is the first process, the roll shifting amount of a working roll of the first process is controlled to be-95-70 mm; if the rolling process is a second process, controlling the roll shifting amount of a working roll of the second process to be-60-40 mm;
when the silicon element content ranges of the first steel grade and the second steel grade are both more than or equal to 1.8% and less than or equal to 3.0%, the rolling process is a second process, and the roll shifting amount of a working roll of the second process is controlled to be-30 to-10 mm;
when the silicon element interval content of the first steel grade and the second steel grade is 3.0% < Si < 3.6%, the rolling process is a third process, and the roll shifting amount of a working roll of the third process is controlled to be +30 to +60 mm.
Further, the air conditioner is provided with a fan,
the first process is that the mixed casting blank is hot-rolled to obtain a hot-rolled coil, the hot-rolled coil is pulled and straightened to obtain a flat coil, and the flat coil is sequentially subjected to acid pickling and continuous cold rolling to obtain a cold-hard coil;
the second process is that the mixed casting blank is hot-rolled to obtain a hot-rolled coil, the hot-rolled coil is sequentially subjected to normalized acid cleaning and straightening to obtain a flat coil, and the flat coil is sequentially subjected to acid cleaning and continuous cold rolling to obtain a cold-hard coil;
and the third process is that the mixed casting blank is subjected to hot rolling to obtain a hot rolled coil, the hot rolled coil is subjected to trimming and normalized acid washing to obtain an acid washing coil, and the acid washing coil is subjected to reversible cold rolling to obtain a cold hard coil.
Further, when the silicon element interval contents of the first steel grade and the second steel grade are both equal to or less than 1.2 percent, the straightening elongation of the first process is 1.5-2.8 percent, the temperature of the first process before continuous cold rolling after the first process is subjected to flattening and pickling is controlled to be 15-35 ℃, and the thickness of the cold-hard coil of the first process is 0.347-0.65 mm.
Further, when the silicon element content interval of the first steel grade and the second steel grade is more than or equal to 1.2 percent and less than or equal to 1.8 percent, the rolling process is a first process or a second process,
the withdrawal and straightening elongation of the first process is 1.5-2.8%, the temperature of the flat coil of the first process before cold rolling after acid washing is controlled to be 15-35 ℃, and the thickness of the cold-hard coil of the first process is 0.347-0.65 mm;
the withdrawal and straightening elongation of the second process is 0.8-1.1%, the temperature of the flat coil of the second process after acid cleaning and before cold rolling is controlled to be 15-35 ℃, and the thickness of the cold-hard coil of the second process is 0.347-0.65 mm;
further, when the silicon element content of the first steel type and the second steel type is more than or equal to 1.8% and less than or equal to 3.0%, the withdrawal and straightening elongation of the second process is 0, the temperature of the flat coil after acid cleaning and before continuous cold rolling is controlled to be 50-100 ℃, and the thickness of the cold-hard coil of the second process is 0.347-0.65 mm.
Further, when the silicon element interval content of the first steel grade and the second steel grade is 3.0% < Si < 3.6%, the temperature of the acid-washed coil of the third process before cold rolling is controlled to be 50-100 ℃, and the thickness of the cold-hard coil of the third process is 0.347-0.497 mm.
Further, the first steel grade and the second steel grade are non-oriented silicon steel.
The beneficial effects of the invention at least comprise:
the invention discloses a rolling method of a different steel type mixed casting blank, which is characterized in that according to the content range of silicon element intervals of a first steel type and a second steel type, the mixed casting blank enters a rolling process with different roll shifting amounts of working rolls, the rolling process of the mixed casting blank is stable, and the problem of strip breakage caused by rolling by using a rolling process of non-oriented silicon steel with lower silicon element content is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a process step diagram of a rolling method of a dissimilar steel type mixed casting billet according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a rolling method of a mixed casting blank of different steel types, which is suitable for rolling the mixed casting blanks of a first steel type and a second steel type with different steel types and components, and comprises the following steps,
and S1, determining the silicon element interval content of the first steel grade and the second steel grade.
The first steel and the second steel are non-oriented silicon steel, and the silicon content in the non-oriented silicon steel can greatly influence the brittleness of hot coils, flat coils and acid-washed coils in the rolling process and the magnetic induction and iron loss performance of end products, so the interval content of silicon elements is used as the basis for determining the rolling process of the first steel and the second steel.
And S2, determining that the mixed casting blanks of the first steel type and the second steel type enter the rolling process with different roll shifting amounts of working rolls according to the determined silicon element interval content of the first steel type and the second steel type.
For the mixed casting blank of the non-oriented silicon steel, the roller shifting amount is reduced as much as possible, the edge stress of the strip steel can be reduced, the edge of the strip steel is prevented from cracking, and the cracking is prevented from developing into strip breakage. And the edge drop is increased due to the excessively small roll shifting amount, so that the transverse thickness difference is influenced, and therefore, a balance point is searched between the broken belt and the transverse thickness difference due to the roll shifting amount of the mixed casting blank with different silicon element interval contents.
Five conditions of the rolling process of the mixed casting blank entering different roll shifting amounts of the working rolls according to the silicon element interval content of the first steel grade and the second steel grade are described in detail below.
In the first case: when the silicon element interval contents of the first steel grade and the second steel grade are both less than or equal to 1.2 percent of Si, the rolling process is a first process, the first process is a mixed casting blank hot rolling process to obtain a hot rolled coil, the hot rolled coil is pulled and straightened to obtain a flat coil, and the flat coil is sequentially subjected to acid cleaning and continuous cold rolling to obtain a cold and hard coil.
The roll shifting amount of the continuous cold rolling working roll is controlled to be-95 to-70 mm; the withdrawal and straightening elongation is 1.5-2.8%, the temperature of the flat coil after acid cleaning and before cold rolling is controlled to be 15-35 ℃, and the thickness of the cold-hard coil is 0.347-0.65 mm;
for the non-oriented silicon steel with two grades and Si less than or equal to 1.2 percent, the roll shifting amount of the mixed casting billet in the continuous cold rolling procedure is controlled to be-95 to-70 mm, so as to prevent the strip breakage problem in the rolling process. For non-oriented silicon steel mixed casting blanks, the roll shifting amount is reduced as much as possible, the edge stress of strip steel can be reduced, the edge of the strip steel is prevented from cracking, the cracking is prevented from being developed into strip breakage, the rolling process is ensured to be smooth, the pulling and straightening elongation is controlled to be 1.5-2.8%, the problem that the strip steel is easy to brittle fracture in the rolling process is solved because the silicon content of the non-oriented silicon steel is high, and therefore the pulling and straightening elongation cannot be too high.
In this case, the mixed cast slab is judged to be of a grade having a low silicon content, for example, if the silicon content of the first steel grade is less than that of the second steel grade, the mixed cast slab is judged to be of the first steel grade; and if the silicon content of the first steel grade is greater than that of the second steel grade, judging the mixed casting blank as the second steel grade.
In the second case: when the silicon element interval content of the first steel type and the second steel type is more than or equal to 1.2% and less than or equal to 1.8%, if the rolling process is the first process, the first process is mixed casting blank hot rolling to obtain a hot rolled coil, the hot rolled coil is pulled and straightened to obtain a flat coil, and the flat coil is sequentially subjected to acid pickling and continuous cold rolling to obtain a chilled coil.
The roll shifting amount of the continuous cold rolling working roll is controlled to be-95-70 mm, the withdrawal and straightening elongation rate is controlled to be 1.5-2.8%, the temperature of the flat coil after acid cleaning and before cold rolling is controlled to be 15-35 ℃, and the thickness of the cold-hard coil is 0.347-0.65 mm.
For non-oriented silicon steel with Si being more than or equal to 1.2% and less than or equal to 1.8%, the roll shifting amount of a mixed casting blank in the continuous cold rolling process is controlled to be-95-70 mm, so that the dimensional precision of the product is improved. For non-oriented silicon steel-concrete casting blanks, the roll shifting amount is reduced as much as possible, the edge stress of strip steel can be reduced, the edge of the strip steel is prevented from cracking, the cracking is prevented from being developed into strip breakage, and the smooth rolling process is ensured. The strip steel can be trimmed or not after acid cleaning before cold rolling, and the trimming can ensure the size precision of the cold hard coil but can improve the production cost. The straightening elongation is controlled to be 1.5-2.8% because the non-oriented silicon steel has high silicon content and low-temperature brittleness, so that the steel strip is easy to brittle fracture in the rolling process, and the straightening elongation cannot be too high.
In this case, the mixed cast slab was judged to be of a grade having a low silicon content. For example, if the silicon content of the first steel grade is less than that of the second steel grade, the mixed cast billet is judged to be the first steel grade; if the silicon content of the first steel grade is larger than that of the second steel grade, judging the mixed casting blank as the second steel grade, and mainly ensuring that a cold-hard coil obtained after rolling the mixed casting blank meets the performance requirement of a judged brand; if the mixed casting blank in the process is judged to be of a grade with higher silicon content, the requirements of magnetic induction and iron loss of the grade with higher silicon content cannot be met due to insufficient silicon content of the mixed casting blank.
In the third case: when the silicon element interval content of the first steel type and the second steel type is more than or equal to 1.2% and less than or equal to 1.8%, if the rolling process is the second process, the second process is mixed casting blank hot rolling to obtain a hot rolled coil, the hot rolled coil is sequentially subjected to normalized acid washing and pulling straightening to obtain a flat coil, and the flat coil is sequentially subjected to acid washing and continuous cold rolling to obtain a chilled coil.
The roll shifting amount of the continuous cold rolling working roll is controlled to be-60-40 mm, the withdrawal and straightening elongation is 0.8-1.1%, the temperature of the flat coil after acid cleaning and before cold rolling is controlled to be 15-35 ℃, and the thickness of the cold-hard coil is 0.347-0.65 mm.
For the non-oriented silicon steel treated by the normalized pickling process within the range of more than or equal to 1.2% and less than or equal to 1.8%, the roll shifting amount of the mixed casting blank in the continuous cold rolling process is controlled to be-60-40 mm, so that the problem of strip breakage in the rolling process is solved. For non-oriented silicon steel mixed casting blanks, the roll shifting amount is reduced as much as possible, the edge stress of strip steel can be reduced, the edge of the strip steel is prevented from cracking, the cracking is prevented from being developed into strip breakage, the rolling process is ensured to be smooth, the straightening elongation is controlled to be 0.8-1.1%, the problem that the strip steel is easy to brittle fracture in the rolling process due to high silicon content and low-temperature brittleness is solved, and therefore the straightening elongation cannot be too high.
In this case, the mixed cast slab is judged to be of a grade having a low silicon content, for example, if the silicon content of the first steel grade is less than that of the second steel grade, the mixed cast slab is judged to be of the first steel grade; if the silicon content of the first steel grade is larger than that of the second steel grade, judging the mixed casting blank as the second steel grade, and mainly ensuring that a cold-hard coil obtained after rolling the mixed casting blank meets the performance requirement of a judged brand; if the mixed casting blank in the process is judged to be of a grade with higher silicon content, the requirements of magnetic induction and iron loss of the grade with higher silicon content cannot be met due to insufficient silicon content of the mixed casting blank.
In a fourth case: when the silicon element interval content of the first steel type and the second steel type is more than or equal to 1.8% and less than or equal to 3.0%, the rolling process is a second process, the second process is a mixed casting blank hot rolling process to obtain a hot rolled coil, the hot rolled coil is sequentially subjected to normalized acid washing and straightening to obtain a flat coil, and the flat coil is sequentially subjected to acid washing and continuous cold rolling to obtain a chilled coil.
The roll shifting amount of the continuous cold rolling working roll is controlled to be-30 to-10 mm, the straightening elongation is 0, the temperature of the flat coil after acid washing and before continuous cold rolling is controlled to be 50 to 100 ℃, and the thickness of the cold-hard coil is 0.347 to 0.65 mm.
For non-oriented silicon steel with Si being more than or equal to 1.8% and less than or equal to 3.0%, the content of silicon is higher than that of the silicon in the first three cases, so that the problem of strip breakage is more likely to occur, and the roll shifting amount of the mixed casting blank in the continuous cold rolling process is controlled to be-30 to-10 mm, so that the problem of strip breakage in the rolling process is prevented. For non-oriented silicon steel-concrete casting blanks, the roll shifting amount is reduced as much as possible, the edge stress of strip steel can be reduced, the edge of the strip steel is prevented from cracking, the cracking is prevented from being developed into strip breakage, and the smooth rolling process is ensured. The tension-leveling elongation is controlled to be 0 because the non-oriented silicon steel has high silicon content and low-temperature brittleness, so that the steel strip is easy to brittle fracture in the tension-leveling process, and the tension-leveling elongation cannot be applied; before acid pickling and cold rolling, the temperature of the strip steel is controlled to be 50-100 ℃, because the temperature of 50-100 ℃ is the low-temperature brittle transition temperature of silicon steel, the strip breakage problem can be prevented by rolling in the temperature range.
In this case, after the mixed casting billet is rolled, the properties of the mixed casting billet, such as iron loss, magnetic induction and the like, are detected, and the properties of the mixed casting billet are judged.
In the fifth case: when the silicon element interval content of the first steel type and the second steel type is 3.0% < Si < 3.6%, the rolling process is a third process, the third process is that the mixed casting blank is subjected to hot rolling to obtain a hot rolled coil, the hot rolled coil is subjected to trimming and normalizing acid cleaning to obtain an acid cleaning coil, and the acid cleaning coil is subjected to reversible cold rolling to obtain a cold-hard coil.
The roll shifting amount of the cold rolling working roll is controlled to be +30 to +60mm, the cold rolling process adopts a twenty-roll reversible rolling mill for rolling, the temperature of the acid-washed roll before cold rolling is controlled to be 50 to 100 ℃, and the thickness of the cold-hard roll is 0.347 to 0.497 mm.
The twenty high mill is selected in this case because it is a reversible mill, and is more suitable for rolling non-oriented silicon steel having a high silicon content and a thin target thickness than a continuous cold rolling mill train. This is because the crystal grains in the steel strip become large after the normalized pickling treatment, the brittleness thereof also increases remarkably, and when the continuous cold rolling process is performed, the roll diameter is large, the rolling force is large, and the starting sheet cannot be lifted and stably rolled due to embrittlement, so that the problem of breakage is likely to occur.
Since the silicon content in the non-oriented silicon steel in this case is very high and the target thickness of the cold-hardened coil is very thin, the roll shifting amount in the twenty-high rolling mill is the largest among the five cases to prevent the occurrence of strip breakage, since the large edge rolling is realized to ensure the stability of cold rolling corresponding to the larger roll shifting amount set in the cold rolling.
And rolling the mixed casting blank of the first steel type and the second steel type by adopting the five conditions, wherein the alloy compensation difference value obtained by rolling meets the standard requirement.
The rolling method of the mixed casting billet of different steel types disclosed by the invention is further explained by combining specific examples.
Before describing specific embodiments, the alloy compensation deviation is explained, the alloy compensation deviation is 2 um/target thickness of the cold-hard coil, and the alloy compensation difference of the cold-hard coil rolled by the mixed casting blank of the first steel type and the second steel type is required to be smaller than the alloy compensation deviation, so that the problem that the thickness difference exceeds the standard is avoided.
Example 1
The silicon content of the first steel grade is 0.4% and the silicon content of the second steel grade is 0.8%, the silicon content of the first steel grade and the second steel grade falling within the range of the first case.
Judging a mixed casting blank of a first steel type and a second steel type as a first steel type, wherein the rolling process of the mixed casting blank is a first process, the first process is a mixed casting blank hot rolling process to obtain a hot rolled coil, the hot rolled coil is pulled and straightened to obtain a flat coil, the flat coil is sequentially subjected to acid cleaning and continuous cold rolling to obtain a chilled coil, and the roll shifting amount of a continuous cold rolling working roll is controlled to be-90 mm; the withdrawal and straightening elongation rate is 2.7 percent, the temperature of the strip steel is controlled to be 20 ℃ after pickling and before cold rolling, and the thickness of the cold hard coil is 0.498 mm;
it is worth noting that the mixed casting blanks of the first steel grade and the second steel grade are smooth in the rolling process and have no strip breakage, the alloy compensation difference of a cold-hard coil rolled by the mixed casting blanks is 0.35 percent, and the alloy compensation deviation is not more than 2 mu m/498 mu m-0.4 percent
Example 2
The silicon content of the first steel grade was 1.3%, the silicon content of the second steel grade was 1.8%, and the silicon content of the first steel grade and the second steel grade fell within the range of the second case.
Judging a mixed casting blank of a first steel type and a second steel type as a first steel type, and rolling by adopting a first process, wherein the first process is to obtain a hot rolled coil by hot rolling the mixed casting blank, the hot rolled coil is subjected to straightening to obtain a flat coil, the flat coil is sequentially subjected to acid cleaning and continuous cold rolling to obtain a chilled coil, the roll shifting amount of a continuous cold rolling working roll is controlled to be-55 mm, the straightening elongation is 1.6%, the temperature of the flat coil after acid cleaning and before cold rolling is controlled to be 30 ℃, and the thickness of the chilled coil is 0.498 mm;
it is noted that the mixed casting blanks of the first steel grade and the second steel grade are smooth in the rolling process, the strip breakage does not occur, and the difference of the alloy compensation of the thickness gauge of a cold-hardened coil obtained by rolling the mixed casting blanks is 0.3% and does not exceed the alloy compensation deviation of 2 mu m/498 mu m which is 0.4%.
Example 3
The silicon content of the first steel grade was 1.3%, the silicon content of the second steel grade was 1.8%, and the silicon content of the first steel grade and the second steel grade fell within the range of the third case.
Judging a mixed casting blank of a first steel type and a second steel type as the first steel type, rolling the mixed casting blank by adopting a second process, wherein the second process is that the mixed casting blank is hot-rolled to obtain a hot-rolled coil, the hot-rolled coil is sequentially subjected to normalized pickling and straightening to obtain a flat coil, the flat coil is sequentially subjected to pickling and continuous cold rolling to obtain a cold-hard coil, the roll shifting amount of a continuous cold-rolling working roll is controlled to be-40 mm, the straightening elongation is 0.85%, the temperature of a strip steel of the flat coil before cold rolling after pickling is controlled to be 20 ℃, and the thickness of the cold-hard coil is 0.498 mm;
it is noted that the mixed casting blanks of the first steel grade and the second steel grade are smooth in the rolling process, the strip breakage is avoided, and the alloy compensation difference of the cold-hardened coils produced by the rolling of the mixed casting blanks is 0.3% and is not more than 0.4% of the alloy compensation deviation 2 mu m/498 mu m.
Example 4
The silicon content of the first steel grade was 2.1%, the silicon content of the second steel grade was 2.8%, and the silicon content of the first steel grade and the second steel grade fell within the range of the fourth case.
Judging a mixed casting blank of a first steel type and a second steel type as the first steel type, rolling the mixed casting blank by adopting a second process, wherein the second process is that the mixed casting blank is hot-rolled to obtain a hot-rolled coil, the hot-rolled coil is sequentially subjected to normalized pickling and straightening to obtain a flat coil, the flat coil is sequentially subjected to pickling and continuous cold rolling to obtain a chilled coil, the roll shifting amount of a continuous cold-rolled working roll is controlled to be-10 mm, the straightening elongation is 0, the temperature of the flat coil after pickling and before cold rolling is controlled to be 70 ℃, and the thickness of the chilled coil is 0.35 mm;
it is noted that the mixed casting billets of the first steel grade and the second steel grade are smooth in the rolling process, no strip breakage occurs, and the thickness gauge alloy compensation difference of cold-hardened coils obtained by rolling the mixed casting billets is 0.5% and does not exceed the alloy compensation deviation of 2 mu m/350 mu m which is 0.57%.
Example 5
The silicon content of the first steel grade was 3.2%, the silicon content of the second steel grade was 3.5%, and the silicon content of the first steel grade and the second steel grade fell within the range of the third case.
Judging the mixed casting blank of the first steel type and the second steel type as the first steel type, rolling the mixed casting blank by adopting a third process, wherein the third process is that the mixed casting blank is subjected to hot rolling to obtain a hot rolled coil, the hot rolled coil is subjected to trimming and normalized acid washing to obtain an acid washing coil, the acid washing coil is subjected to reversible cold rolling to obtain a chilled coil, the roll shifting amount of a reversible cold rolling working roll is controlled to be 30mm, the temperature of the acid washing coil before cold rolling is controlled to be 90 ℃, and the thickness of the chilled coil is 0.347 mm;
it is noted that the mixed casting billets of the first steel grade and the second steel grade are smooth in the rolling process, no strip breakage occurs, and the thickness gauge alloy compensation difference of cold-hardened coils obtained by rolling the mixed casting billets is 0.4% and does not exceed the alloy compensation deviation of 2 mu m/350 mu m which is 0.57%.
The above-mentioned embodiments are only for convenience of description, and are not intended to limit the present invention in any way, and it will be understood by those skilled in the art that the technical features of the present invention can be changed or modified by the equivalent embodiments without departing from the scope of the present invention.
Claims (9)
1. A rolling method of a different steel type mixed casting blank is suitable for rolling a mixed casting blank of a first steel type and a second steel type which have different steel type components, and is characterized by comprising the following steps:
determining the interval content of silicon elements of the first steel grade and the second steel grade;
and determining the rolling process that the mixed casting blanks of the first steel type and the second steel type enter working rolls with different roll shifting amounts according to the determined interval content of the silicon element of the first steel type and the second steel type.
2. The rolling method of a dissimilar steel type mixed cast slab according to claim 1,
when the content of Si element intervals of the first steel grade and the second steel grade is less than or equal to 1.2 percent, the rolling process is a first process, and the roll shifting amount of a working roll of the first process is-95-70 mm;
when the silicon element content of the first steel grade and the second steel grade is more than or equal to 1.2% and less than or equal to 1.8%, the rolling process is a first process or a second process, the roll shifting amount of a working roll of the first process is controlled to be-95 to-70 mm, and the roll shifting amount of the working roll of the second process is controlled to be-60 to-40 mm;
when the silicon element content ranges of the first steel grade and the second steel grade are both more than or equal to 1.8% and less than or equal to 3.0%, the rolling process is a second process, and the roll shifting amount of a working roll of the second process is controlled to be-30 to-10 mm;
when the silicon element interval content of the first steel grade and the second steel grade is 3.0% < Si < 3.6%, the rolling process is a third process, and the roll shifting amount of a working roll of the third process is controlled to be +30 to +60 mm.
3. The rolling method of the dissimilar steel type mixed cast slab as claimed in claim 2,
the first process is that the mixed casting blank is hot-rolled to obtain a hot-rolled coil, the hot-rolled coil is pulled and straightened to obtain a flat coil, and the flat coil is sequentially subjected to acid pickling and continuous cold rolling to obtain a cold-hard coil;
the second process is that the mixed casting blank is hot-rolled to obtain a hot-rolled coil, the hot-rolled coil is sequentially subjected to normalized acid cleaning and straightening to obtain a flat coil, and the flat coil is sequentially subjected to acid cleaning and continuous cold rolling to obtain a cold-hard coil;
and the third process is that the mixed casting blank is subjected to hot rolling to obtain a hot rolled coil, the hot rolled coil is subjected to trimming and normalized acid washing to obtain an acid washing coil, and the acid washing coil is subjected to reversible cold rolling to obtain a cold hard coil.
4. The rolling method of the dissimilar steel type mixed cast slab as claimed in claim 3,
when the silicon element content of the first steel type and the second steel type is less than or equal to 1.2 percent, the withdrawal and straightening elongation of the first process is controlled to be 1.5-2.8 percent, the temperature of the first process before continuous cold rolling after the first process is subjected to flattening and pickling is controlled to be 15-35 ℃, and the thickness of the cold-hard coil of the first process is 0.347-0.65 mm.
5. The rolling method of the dissimilar steel type mixed cast slab as claimed in claim 3,
when the silicon element content of the first steel type and the second steel type is more than or equal to 1.2% and less than or equal to 1.8%, the straightening elongation of the first process is 1.5-2.8%, the temperature of the flattened coil of the first process before cold rolling after pickling is controlled to be 15-35 ℃, and the thickness of the chilled coil of the first process is 0.347-0.65 mm.
6. The rolling method of the dissimilar steel type mixed cast slab as claimed in claim 3,
when the silicon element interval content of the first steel grade and the second steel grade is more than or equal to 1.2% and less than or equal to 1.8%, the stretch-draw-straightening elongation of the second process is controlled to be 0.8-1.1%, the temperature of a flat coil of the second process after acid pickling and before cold rolling is controlled to be 15-35 ℃, and the thickness of a cold-hard coil of the second process is 0.347-0.65 mm.
7. The rolling method of the dissimilar steel type mixed cast slab as claimed in claim 3,
when the silicon element interval contents of the first steel grade and the second steel grade are both more than or equal to 1.8% and less than or equal to 3.0%, the stretch-straightening elongation of the second process is 0, the temperature of the flat coil after acid washing and before continuous cold rolling is controlled to be 50-100 ℃, and the thickness of the cold-hard coil of the second process is 0.347-0.65 mm.
8. The rolling method of the dissimilar steel type mixed cast slab as claimed in claim 3,
when the silicon element interval contents of the first steel grade and the second steel grade are both 3.0% < Si < 3.6%, the temperature of the pickling coil of the third process is controlled to be 50-100 ℃ after normalized pickling and before cold rolling, and the thickness of the cold-hard coil of the third process is 0.347-0.497 mm.
9. The method for rolling the dissimilar steel mixed cast billet according to claim 1, wherein the first steel grade and the second steel grade are non-oriented silicon steel.
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