CN113832403A - Cover annealing method for low-carbon door plate steel - Google Patents
Cover annealing method for low-carbon door plate steel Download PDFInfo
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- CN113832403A CN113832403A CN202111125067.4A CN202111125067A CN113832403A CN 113832403 A CN113832403 A CN 113832403A CN 202111125067 A CN202111125067 A CN 202111125067A CN 113832403 A CN113832403 A CN 113832403A
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- annealing
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 46
- 239000010959 steel Substances 0.000 title claims abstract description 46
- 238000000137 annealing Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 238000004321 preservation Methods 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 239000000839 emulsion Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a cover annealing method of low-carbon door plate steel, which is implemented according to the following steps: the thickness of the hot rolled coil raw material of 0.7mm low-carbon door plate steel SPCC-MBG is increased from 2.5mm to 2.75mm, and the reduction rate is increased from 72% to 74.55%; the plate type and the target plate type of the door plate steel in the rolling process are controlled to be optimized, and the coiling tension stress is controlled within 30 Mpa; heating the cover type annealing process of the door plate steel at a heating interval of 0-430 ℃ at a heating speed of 84-92 ℃/h, preserving heat at 430 ℃ for 2 hours, heating at 430-710 ℃ at a low heating speed of 41-51 ℃/h, setting the annealing heat preservation temperature to 710 ℃, preserving heat for 8 hours, setting the cooling time of a heating cover with a heating cover to 3 hours, setting the temperature when the heating cover is taken off to 580-600 ℃, and continuing cooling the heating cover with the heating cover when the temperature is higher than 600 ℃; taking off the heating hood, cooling in air for 19 hr, cooling to below 100 deg.c and discharging.
Description
Technical Field
The invention relates to a cover annealing method of low-carbon door plate steel.
Background
The annealing process is a common process method for removing stress and improving the structure form of a cold-rolled product. The door plate steel has higher quality requirements on processing deformation due to the application, so the production difficulty is higher, and an effective annealing process and a method are required to be formed in order to ensure the excellence of indexes such as the surface, the mechanical property and the like of a product. The cover annealing process is a continuous annealing process, and has higher annealing temperature stability and better mechanical property. The user can use the product more stably after processing deformation.
The low-carbon door plate steel annealing process is realized by researching heating temperature, heating speed, heat preservation temperature, heat preservation time, protective atmosphere, heat preservation platform and the like. The reasonability and the superiority of various indexes such as the surface quality, the plate shape, the mechanical property and the like of the low-carbon door plate steel are ensured. The surface quality requirement of the steel of the variety SPCC-M and the like is higher than that of the common SPCC steel, so that the surface defects such as adhesion and the like are easily caused in the production process to degrade the product, and the heating temperature of an annealing furnace is required to be 730 ℃, which is 50 ℃ higher than that of the common SPCC steel, so that the adhesion is easily caused in the heating process. Therefore, the process needs to be improved, the energy consumption is reduced, and the quality is improved. However, the mechanical property of the door sheet steel is poor due to too low temperature, the elongation is low, and the door sheet steel is not favorable for processing, stamping and deforming. Meanwhile, in order to shorten the production and manufacturing period, a degreasing process is not generally adopted, emulsion is remained on the surface of the steel coil after acid continuous rolling, and if special treatment is not performed, a serious black and grey phenomenon is generated in the following procedures, so that the surface quality of the product is seriously influenced.
Disclosure of Invention
The invention aims to provide a cover annealing method for low-carbon door plate steel, which is simple and convenient, is easy to master, can be conveniently operated by a producer and has higher safety.
The purpose of the invention is realized as follows:
a cover annealing method of low-carbon door plate steel is implemented according to the following steps:
1) the low-carbon door plate steel comprises the following chemical components in percentage by mass: the special tapping mark AP1451C1 is adopted, and the content of C is 0.03-0.06%; the Si content is 0.01% -0.04%; the Mn content is 0.15% -0.22%; the content of AL is 0.03-0.05%, P is less than 0.015%, S is less than 0.005%; the thickness of the raw material of the hot-rolled coil of the 0.7mm low-carbon door plate steel SPCC-MBG is increased, the raw material coil with large thickness is increased from 2.5mm to 2.75mm, and the reduction rate is increased from 72% to 74.55%; the plate type and the target plate type of the door plate steel in the rolling process are optimized, the coiling tension stress is controlled within 30Mpa, and sufficient gaps are ensured among steel coil layers, so that the residual emulsion is volatilized and overflows during annealing;
2) the cover type annealing process of the door plate steel is improved, heating is carried out at a heating speed of 84-92 ℃/h in a heating interval of 0-430 ℃, heat preservation is carried out for 2 hours at 430 ℃, emulsion residues on the surface of a rolled steel coil are ensured to be fully volatilized, hydrogen flowing blowing is adopted during heat preservation, heating is carried out at a low heating speed of 41-51 ℃/h at 430-710 ℃, the annealing heat preservation temperature is set to 710 ℃, heat preservation is carried out for 8 hours, the cooling time of a heating cover is set to 3 hours, the temperature when the heating cover is removed is 580-600 ℃, and cooling with the cover is continued when the temperature is higher than 600 ℃; taking off the heating hood, cooling in air for 19 hr, cooling to below 100 deg.c and discharging.
The SPCC-MBG door plate steel produced by the process has no bonding defect, the surface of the steel coil is clean, the gas consumption of the annealing furnace is very low, and the SPCC-MBG door plate steel has mechanical property indexes such as yield strength, tensile strength and elongation percentage which meet the requirements of national product standards.
The temperature of the annealing furnace is reduced from 730 ℃ to 710 ℃, the cooling time with the heating cover is reduced from 5 hours to within 3 hours, the temperature of the heating cover is controlled below 600 ℃, and the cooling speed is controlled below 40 ℃/h. The purposes of reducing the annealing temperature and shortening the cooling time are achieved. Meanwhile, the surface quality is improved, and the mechanical property is stable and qualified.
The surface reflectivity of the low-carbon door plate steel produced by the process is detected to be more than 70%. The mechanical property is stable, the elongation is 44-51.5%, and the plasticity index is very good.
The method is mainly used for the annealing production process of the low-carbon door plate steel, and can greatly improve the production efficiency and the product quality of the low-carbon door plate steel. The process technology adopted by the invention can be popularized to domestic same type cold rolling workshops adopting cover type annealing process. Meanwhile, the technology can also be popularized and applied to the production and application of other products of the same type.
Detailed Description
A cover annealing method of low-carbon door plate steel is implemented according to the following steps:
1. the low-carbon door plate steel comprises the following chemical components in percentage by mass: the special tapping mark AP1451C1 is adopted, and the content of C is 0.03-0.06%; the Si content is 0.01% -0.04%; the Mn content is 0.15% -0.22%; the content of AL is 0.03-0.05%, P is less than 0.015%, S is less than 0.005%; the thickness of the raw material of the hot-rolled coil of the 0.7mm low-carbon door plate steel SPCC-MBG is increased, the raw material coil with large thickness is increased from 2.5mm to 2.75mm, and the reduction rate is increased from 72% to 74.55%; the plate type and the target plate type of the door plate steel in the rolling process are optimized, the coiling tension stress is controlled within 30Mpa, and sufficient gaps are ensured among steel coil layers, so that the residual emulsion is volatilized and overflows during annealing; 2. the cover type annealing process of the door plate steel is improved, a heating speed of 86 ℃/h is adopted in a heating interval of 0-430 ℃, heat preservation is carried out for 2 hours at 430 ℃, heating is carried out at 43 ℃/h at 430-710 ℃, the annealing heat preservation temperature is set to 710 ℃, heat preservation is carried out for 8 hours, the cooling time with a heating cover is set to 3 hours, the temperature of the heating cover is removed, the cooling cover is used for air cooling and water cooling for 19 hours after the heating cover is removed, and the door plate steel is taken out of the furnace after being cooled to below 95 ℃. The SPCC-MBG door plate steel produced by the process has any bonding defect every month, the gas consumption of the annealing furnace is very low, and the mechanical property indexes of the SPCC-MBG door plate steel, such as yield strength, tensile strength and elongation, meet the product standard requirements.
Claims (1)
1. The annealing method for annealing the low-carbon door plate steel by the cover annealing is characterized by comprising the following steps of:
1) the low-carbon door plate steel comprises the following chemical components in percentage by mass: the special tapping mark AP1451C1 is adopted, and the content of C is 0.03-0.06%; the Si content is 0.01% -0.04%; the Mn content is 0.15% -0.22%; the content of AL is 0.03-0.05%, P is less than 0.015%, S is less than 0.005%; the thickness of the raw material of the hot-rolled coil of the 0.7mm low-carbon door plate steel SPCC-MBG is increased, the raw material coil with large thickness is increased from 2.5mm to 2.75mm, and the reduction rate is increased from 72% to 74.55%; the plate type and the target plate type of the door plate steel in the rolling process are optimized, the coiling tension stress is controlled within 30Mpa, and sufficient gaps are ensured among steel coil layers, so that the residual emulsion is volatilized and overflows during annealing;
2) the cover type annealing process of the door plate steel is improved, heating is carried out at a heating speed of 84-92 ℃/h in a heating interval of 0-430 ℃, heat preservation is carried out for 2 hours at 430 ℃, emulsion residues on the surface of a rolled steel coil are ensured to be fully volatilized, hydrogen flowing blowing is adopted during heat preservation, heating is carried out at a low heating speed of 41-51 ℃/h at 430-710 ℃, the annealing heat preservation temperature is set to 710 ℃, heat preservation is carried out for 8 hours, the cooling time of a heating cover is set to 3 hours, the temperature when the heating cover is removed is 580-600 ℃, and cooling with the cover is continued when the temperature is higher than 600 ℃; taking off the heating hood, cooling in air for 19 hr, cooling to below 100 deg.c and discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111125067.4A CN113832403A (en) | 2021-09-25 | 2021-09-25 | Cover annealing method for low-carbon door plate steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111125067.4A CN113832403A (en) | 2021-09-25 | 2021-09-25 | Cover annealing method for low-carbon door plate steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113832403A true CN113832403A (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111125067.4A Pending CN113832403A (en) | 2021-09-25 | 2021-09-25 | Cover annealing method for low-carbon door plate steel |
Country Status (1)
| Country | Link |
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| CN (1) | CN113832403A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114561520A (en) * | 2022-03-04 | 2022-05-31 | 新疆八一钢铁股份有限公司 | Hydrogen-rich cyclic annealing process for cold-rolled oil drum plate |
| CN114959195A (en) * | 2022-05-07 | 2022-08-30 | 广西柳州钢铁集团有限公司 | Stainless steel hood type annealing method |
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|---|---|---|---|---|
| CN101135025A (en) * | 2006-08-31 | 2008-03-05 | 宝山钢铁股份有限公司 | Production of cold rolling high-strength ultra-deep-drawing steel plate by bell-type furnace and method for manufacturing same |
| KR100812051B1 (en) * | 2006-11-08 | 2008-03-10 | 현대하이스코 주식회사 | Heat treating method for high-tensile steel sheet for car use in the batch annealing furnace |
| CN103990649A (en) * | 2014-06-05 | 2014-08-20 | 济钢集团有限公司 | Method for producing cold-rolled strip for fire distinguisher |
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| CN111218617A (en) * | 2020-02-24 | 2020-06-02 | 包头钢铁（集团）有限责任公司 | Cold-rolled low-carbon steel strip SPCC with low yield strength and no yield platform and production method thereof |
-
2021
- 2021-09-25 CN CN202111125067.4A patent/CN113832403A/en active Pending
Patent Citations (5)
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| CN101135025A (en) * | 2006-08-31 | 2008-03-05 | 宝山钢铁股份有限公司 | Production of cold rolling high-strength ultra-deep-drawing steel plate by bell-type furnace and method for manufacturing same |
| KR100812051B1 (en) * | 2006-11-08 | 2008-03-10 | 현대하이스코 주식회사 | Heat treating method for high-tensile steel sheet for car use in the batch annealing furnace |
| CN103990649A (en) * | 2014-06-05 | 2014-08-20 | 济钢集团有限公司 | Method for producing cold-rolled strip for fire distinguisher |
| CN105112776A (en) * | 2015-08-25 | 2015-12-02 | 上海梅山钢铁股份有限公司 | Phosphorus-containing low-carbon cold-rolled hard tin-plated steel plate and production method thereof |
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Non-Patent Citations (2)
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| 张景进等: "《板带冷轧生产》", 30 April 2006, 冶金工业出版社 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114561520A (en) * | 2022-03-04 | 2022-05-31 | 新疆八一钢铁股份有限公司 | Hydrogen-rich cyclic annealing process for cold-rolled oil drum plate |
| CN114959195A (en) * | 2022-05-07 | 2022-08-30 | 广西柳州钢铁集团有限公司 | Stainless steel hood type annealing method |
| CN114959195B (en) * | 2022-05-07 | 2023-11-24 | 广西柳州钢铁集团有限公司 | Stainless steel hood type annealing method |
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Application publication date: 20211224 |