CN117947249A - Process for relieving brittle failure of low-temperature high-magnetic-induction oriented silicon steel strip - Google Patents
Process for relieving brittle failure of low-temperature high-magnetic-induction oriented silicon steel strip Download PDFInfo
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- CN117947249A CN117947249A CN202410350985.4A CN202410350985A CN117947249A CN 117947249 A CN117947249 A CN 117947249A CN 202410350985 A CN202410350985 A CN 202410350985A CN 117947249 A CN117947249 A CN 117947249A
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- oriented silicon
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- silicon steel
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 65
- 239000010959 steel Substances 0.000 claims abstract description 65
- 238000001816 cooling Methods 0.000 claims abstract description 58
- 238000005096 rolling process Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000006698 induction Effects 0.000 claims description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000000443 aerosol Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000002791 soaking Methods 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 abstract 2
- 229910018503 SF6 Inorganic materials 0.000 abstract 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 abstract 1
- 229960000909 sulfur hexafluoride Drugs 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 11
- 238000005336 cracking Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
The invention belongs to the technical field of oriented silicon steel manufacturing, and particularly relates to a process for slowing down brittle fracture of a low-temperature high-magnetic-induction oriented silicon steel strip, which is characterized in that the brittle fracture phenomenon of the steel strip is obviously reduced and the situation of cracks is greatly improved by adjusting the tension and the rolling rate of a normalizing process and a rolling process comprising NOF (non-thermal-insulation), RTF (thermal-insulation-thermal-insulation) heating, SF (sulfur hexafluoride) soaking and cooling.
Description
Technical Field
The invention relates to the technical field of oriented silicon steel manufacturing, in particular to a process for slowing down brittle failure of a low-temperature high-magnetic induction oriented silicon steel strip.
Background
When high-temperature high-magnetic induction oriented silicon steel is produced in a normalizing way, hot rolled steel strips are generally used as raw materials for normalizing, NOF (non-oxidation heating furnace), RTF (radiant tube heating furnace) heating, SF (soaking furnace) soaking and cooling production processes are used, and due to the fact that the silicon content is high, the problems of brittle fracture, cracking and the like of the steel strips are extremely high probability due to the fact that the normal production processes are adopted, the situation is particularly serious in winter, head-tail wrapping breakage and two-pass start-up breakage easily occur during rolling by a rolling mill, and the yield is seriously reduced; the traditional silicon steel mill adopts a method of induction heating before rolling to relieve shearing stress, so that the operation cost is high, the problem cannot be fundamentally solved, the stability is poor, the rolling efficiency is directly affected, and the brittle fracture is often accompanied with the condition of damaging a rolling mill roller system, so that the production cost is greatly increased.
Disclosure of Invention
In order to solve the problems in the prior art, the main purpose of the invention is to provide a process for slowing down brittle failure of a low-temperature high-magnetic-induction oriented silicon steel strip.
In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided:
A process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strips comprises the following steps:
S1, hot-rolled steel strips enter NOF, the NOF adopts a rapid heating mode, the steel strips are heated to 590-610 ℃ within 20S, and then the steel strips are heated to 980-1020 ℃ within 10S;
s2, feeding the steel belt into an RTF, preserving heat at 1085-1090 ℃ for 60-65S, and then cooling the steel belt to 930 ℃ by adopting a slow cooling mode by the RTF;
s3, feeding SF into the steel belt, and preserving heat for 55-65S at 895-905 ℃;
s4, after the SF of the steel belt is discharged, rapidly cooling the steel belt to 550 ℃ in an aerosol cooling mode, and then cooling to below 80 ℃ through air cooling or water cooling.
As a preferable scheme of the process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strip, the invention comprises the following steps: the process also comprises a step S5, wherein the steel strip cooled to the temperature below 80 ℃ is rolled, the tension is 16 tons during rolling, the rolling first pass reduction rate is 35%, and the rolling second pass reduction rate is 34%.
As a preferable scheme of the process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strip, the invention comprises the following steps: in the step S2, the cooling rate is 15-20 ℃/S.
As a preferable scheme of the process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strip, the invention comprises the following steps: in the step S3, the nitrogen amount is controlled, and the furnace pressure is ensured to be more than or equal to 35Pa.
As a preferable scheme of the process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strip, the invention comprises the following steps: in the step S4, the cooling rate of the aerosol cooling is 13-17 ℃/S.
In order to solve the above technical problems, according to another aspect of the present invention, the following technical solutions are provided:
the low-temperature high-magnetic-induction oriented silicon steel is prepared by adopting the process for relieving brittle failure of the low-temperature high-magnetic-induction oriented silicon steel strip.
As a preferable scheme of the low-temperature high-magnetic induction oriented silicon steel, the invention comprises the following steps: the tensile strength of the high-temperature high-magnetic induction oriented silicon steel is more than or equal to 650MPa, and the elongation is more than or equal to 60%.
The beneficial effects of the invention are as follows:
the invention provides a process for slowing down brittle failure of a low-temperature high-magnetic-induction oriented silicon steel strip, which is characterized in that the brittle failure phenomenon of the steel strip is obviously reduced and the situation of cracks is greatly improved by adjusting the tension and the rolling rate of a normalizing process and a rolling process comprising NOF (non-aqueous aluminum) and RTF (thermal transfer coating) heating, SF soaking and cooling.
Detailed Description
The following description will be made clearly and fully with reference to the technical solutions in the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
According to one aspect of the invention, the invention provides the following technical scheme:
A process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strips comprises the following steps:
S1, hot-rolled steel strips enter NOF, the NOF adopts a rapid heating mode, the steel strips are heated to 590-610 ℃ within 20S to prevent the steel strips from oxidization, and then the steel strips are heated to 980-1020 ℃ within 10S to enable the steel strips to rapidly reach the process temperature;
S2, feeding the steel strip into RTF, preserving heat at 1085-1090 ℃ for 60-65S, normalizing at low temperature, enabling grains to uniformly grow, reducing the grain size difference between the surface layer and the central part, and cooling the steel strip to 930 ℃ by adopting a slow cooling mode by the RTF;
s3, feeding SF into the steel belt, and preserving heat for 55-65S at 895-905 ℃;
s4, after the SF of the steel belt is discharged, rapidly cooling the steel belt to 550 ℃ in an aerosol cooling mode, and then cooling to below 80 ℃ through air cooling or water cooling.
Preferably, the process further comprises a step S5, wherein the steel strip cooled to the temperature below 80 ℃ is rolled, the tension is 16 tons during rolling, the rolling first pass reduction rate is 35%, and the rolling second pass reduction rate is 34%.
Preferably, in the step S2, the cooling rate is 15-20 ℃/S.
Preferably, in the step S3, the nitrogen amount is controlled to ensure that the furnace pressure is more than or equal to 35Pa.
Preferably, in the step S4, the cooling rate of the aerosol cooling is 13-17 ℃/S.
According to another aspect of the invention, the invention provides the following technical scheme:
the low-temperature high-magnetic-induction oriented silicon steel is prepared by adopting the process for relieving brittle failure of the low-temperature high-magnetic-induction oriented silicon steel strip.
As a preferable scheme of the low-temperature high-magnetic induction oriented silicon steel, the invention comprises the following steps: the tensile strength of the high-temperature high-magnetic induction oriented silicon steel is more than or equal to 650MPa, and the elongation is more than or equal to 60%.
The technical scheme of the invention is further described below by combining specific embodiments.
Example 1
A process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strips comprises the following steps:
S1, hot-rolled steel strips enter NOF, the NOF adopts a rapid heating mode, the steel strips are heated to 600 ℃ for 20S, and then the steel strips are heated to 1000 ℃ for 10S;
s2, feeding the steel belt into an RTF (temperature-maintaining device), maintaining the temperature at 1090 ℃ for 60 seconds, and cooling the steel belt to 930 ℃ by adopting a slow cooling mode by the RTF, wherein the cooling rate is 15 ℃/S;
S3, feeding SF into the steel belt, preserving heat at 900 ℃ for 60S, controlling the nitrogen amount, and ensuring that the furnace pressure is more than or equal to 35Pa.
S4, after the SF of the steel belt is discharged, rapidly cooling the steel belt to 550 ℃ in an aerosol cooling mode, wherein the cooling rate of the aerosol cooling is 15 ℃/S; cooling to below 80 deg.c through air cooling or water cooling;
s5, rolling the steel strip cooled to the temperature below 80 ℃, wherein the tension is 16 tons during rolling, the rolling first pass reduction rate is 35%, and the rolling second pass reduction rate is 34%.
The low-temperature high-magnetic induction oriented silicon steel prepared by the embodiment has obviously improved tensile strength, the tensile strength is 700MPa, and the elongation is 74%.
Example 2
A process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strips comprises the following steps:
s1, hot-rolled steel strips enter NOF, the NOF adopts a rapid heating mode, the steel strips are heated to 590 ℃ for 20S, and then the steel strips are heated to 980 ℃ for 10S, so that the steel strips can rapidly reach the process temperature;
s2, feeding the steel belt into an RTF (temperature-maintaining device), maintaining the temperature at 1085 ℃ for 65S, and cooling the steel belt to 930 ℃ by adopting a slow cooling mode by the RTF at a cooling rate of 20 ℃/S;
s3, feeding SF into the steel belt, preserving heat at 895 ℃ for 65S, controlling the nitrogen amount, and ensuring that the furnace pressure is more than or equal to 35Pa.
S4, after the SF of the steel belt is discharged, rapidly cooling the steel belt to 550 ℃ in an aerosol cooling mode, wherein the cooling rate of the aerosol cooling is 17 ℃/S; cooling to below 80 deg.c through air cooling or water cooling;
s5, rolling the steel strip cooled to the temperature below 80 ℃, wherein the tension is 16 tons during rolling, the rolling first pass reduction rate is 35%, and the rolling second pass reduction rate is 34%.
The low-temperature high-magnetic induction oriented silicon steel prepared by the embodiment has obviously improved tensile strength, the tensile strength is 668MPa, and the elongation is 68%.
Example 3
A process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strips comprises the following steps:
S1, hot-rolled steel strips enter NOF, the NOF adopts a rapid heating mode, the steel strips are heated to 610 ℃ for 20S to prevent the steel strips from oxidizing, and then the steel strips are heated to 1020 ℃ for 10S to enable the steel strips to rapidly reach the process temperature;
S2, the steel strip enters RTF, heat preservation is carried out for 60S at 1090 ℃, the temperature is normalized at the position, the purpose is that crystal grains can uniformly grow, the size difference of crystal grains at the surface layer and the center part is reduced, then the RTF adopts a slow cooling mode to cool the steel strip to 930 ℃, and the cooling rate is 18 ℃/S;
S3, feeding SF into the steel belt, preserving heat for 55S at 905 ℃, controlling the nitrogen amount, and ensuring that the furnace pressure is more than or equal to 35Pa.
S4, after the SF of the steel belt is discharged, rapidly cooling the steel belt to 550 ℃ in an aerosol cooling mode, wherein the cooling rate of the aerosol cooling is 13 ℃/S; cooling to below 80 deg.c through air cooling or water cooling;
s5, rolling the steel strip cooled to the temperature below 80 ℃, wherein the tension is 16 tons during rolling, the rolling first pass reduction rate is 35%, and the rolling second pass reduction rate is 34%.
The low-temperature high-magnetic induction oriented silicon steel prepared by the embodiment has obviously improved tensile strength, the tensile strength is 653MPa, and the elongation is 62%.
Comparative example 1
The difference from example 1 is that the steel strip is heated to 1000 c for 60S in step S1.
The tensile strength of the low-temperature high-magnetic induction oriented silicon steel prepared in the comparative example is 523MPa, and the elongation is 37%.
Comparative example 2
The difference from example 1 is that in step S2, the temperature is kept at 1100℃for 60S, after which the RTF is cooled to 920℃at a cooling rate of 25℃per second.
The tensile strength of the low-temperature high-magnetic induction oriented silicon steel prepared in the comparative example is 560MPa, and the elongation is 49%.
Comparative example 3
The difference from example 1 is that the temperature was kept at 850℃for 60S in step S3.
The tensile strength of the low-temperature high-magnetic induction oriented silicon steel prepared in the comparative example is 584MPa, and the elongation is 51%.
Comparative example 4
The difference from example 1 is that the tension at the time of rolling in step S5 is 18 tons.
The tensile strength of the low-temperature high-magnetic induction oriented silicon steel prepared in the comparative example is 540MPa, and the elongation is 42%.
Comparative example 5
The difference from example 1 is that the first pass reduction of rolling is 32% and the second pass reduction is 29%.
The tensile strength of the low-temperature high-magnetic induction oriented silicon steel prepared in the comparative example is 551MPa, and the elongation is 46%.
As can be seen from the embodiment and the comparative example, the tensile strength of the low-temperature high-magnetic induction oriented silicon steel treated by the process is more than or equal to 650MPa, and the elongation is more than or equal to 60 percent by adjusting the tension and the rolling rate of the normalizing process and the rolling process comprising NOF, RTF heating, SF soaking and cooling, so that the brittle failure phenomenon of the steel strip is obviously reduced and the cracking condition is greatly improved.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the content of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. A process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strip is characterized by comprising the following steps:
S1, hot-rolled steel strips enter NOF, the NOF adopts a rapid heating mode, the steel strips are heated to 590-610 ℃ within 20S, and then the steel strips are heated to 980-1020 ℃ within 10S;
s2, feeding the steel belt into an RTF, preserving heat at 1085-1090 ℃ for 60-65S, and then cooling the steel belt to 930 ℃ by adopting a slow cooling mode by the RTF;
s3, feeding SF into the steel belt, and preserving heat for 55-65S at 895-905 ℃;
s4, after the SF of the steel belt is discharged, rapidly cooling the steel belt to 550 ℃ in an aerosol cooling mode, and then cooling to below 80 ℃ through air cooling or water cooling.
2. The process for reducing brittle failure of low-temperature high-magnetic induction oriented silicon steel strip according to claim 1, further comprising step S5, wherein the steel strip cooled to 80 ℃ or lower is rolled under a tension of 16 tons, wherein the rolling has a first pass reduction of 35% and a second pass reduction of 34%.
3. The process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strip according to claim 1, wherein in the step S2, the cooling rate is 15-20 ℃/S.
4. The process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strip according to claim 1, wherein in the step S3, the nitrogen amount is controlled to ensure that the furnace pressure is more than or equal to 35Pa.
5. The process for slowing down brittle failure of low-temperature high-magnetic induction oriented silicon steel strip according to claim 1, wherein in the step S4, the cooling rate of the aerosol cooling is 13-17 ℃/S.
6. The low-temperature high-magnetic-induction oriented silicon steel is characterized by being prepared by adopting the process for slowing down brittle fracture of the low-temperature high-magnetic-induction oriented silicon steel strip according to any one of claims 1-5.
7. The low-temperature high-magnetic induction oriented silicon steel according to claim 6, wherein the tensile strength of the high-magnetic induction oriented silicon steel is more than or equal to 650MPa, and the elongation is more than or equal to 60%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111286593A (en) * | 2020-02-17 | 2020-06-16 | 本钢板材股份有限公司 | Method for producing high-magnetic-induction non-oriented silicon steel 50BW800G through non-normalized heat treatment |
| JP2020190017A (en) * | 2019-05-23 | 2020-11-26 | Ｊｆｅスチール株式会社 | Dew point control method for reduction atmospheric furnace, reduction atmospheric furnace, method for producing cold rolled steel sheet, and method for producing hot dip galvanized steel sheet |
| CN113502433A (en) * | 2021-04-19 | 2021-10-15 | 本钢板材股份有限公司 | Thin non-oriented silicon steel 35BW440 and production method thereof |
| CN114277317A (en) * | 2021-12-10 | 2022-04-05 | 本钢板材股份有限公司 | Production method of non-oriented silicon steel for agricultural electric machine |
| CN115433869A (en) * | 2022-09-23 | 2022-12-06 | 无锡普天铁心股份有限公司 | Method for improving wide-direction magnetic uniformity of low-temperature high-magnetic-induction oriented silicon steel plate |
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- 2024-03-26 CN CN202410350985.4A patent/CN117947249A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020190017A (en) * | 2019-05-23 | 2020-11-26 | Ｊｆｅスチール株式会社 | Dew point control method for reduction atmospheric furnace, reduction atmospheric furnace, method for producing cold rolled steel sheet, and method for producing hot dip galvanized steel sheet |
| CN111286593A (en) * | 2020-02-17 | 2020-06-16 | 本钢板材股份有限公司 | Method for producing high-magnetic-induction non-oriented silicon steel 50BW800G through non-normalized heat treatment |
| CN113502433A (en) * | 2021-04-19 | 2021-10-15 | 本钢板材股份有限公司 | Thin non-oriented silicon steel 35BW440 and production method thereof |
| CN114277317A (en) * | 2021-12-10 | 2022-04-05 | 本钢板材股份有限公司 | Production method of non-oriented silicon steel for agricultural electric machine |
| CN115433869A (en) * | 2022-09-23 | 2022-12-06 | 无锡普天铁心股份有限公司 | Method for improving wide-direction magnetic uniformity of low-temperature high-magnetic-induction oriented silicon steel plate |
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