CN114045380A - Control method for annealing stamp of 400 series stainless steel bell-type furnace - Google Patents
Control method for annealing stamp of 400 series stainless steel bell-type furnace Download PDFInfo
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- CN114045380A CN114045380A CN202111320979.7A CN202111320979A CN114045380A CN 114045380 A CN114045380 A CN 114045380A CN 202111320979 A CN202111320979 A CN 202111320979A CN 114045380 A CN114045380 A CN 114045380A
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- Prior art keywords
- annealing
- furnace
- stainless steel
- hydrogen
- frequency
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000137 annealing Methods 0.000 title claims abstract description 18
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 16
- 239000010935 stainless steel Substances 0.000 title claims abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 27
- 239000001257 hydrogen Substances 0.000 claims abstract description 27
- 238000004321 preservation Methods 0.000 claims abstract description 12
- 238000010926 purge Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract description 12
- 238000006731 degradation reaction Methods 0.000 abstract description 12
- 230000007547 defect Effects 0.000 abstract description 4
- 238000010079 rubber tapping Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000005097 cold rolling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/663—Bell-type furnaces
- C21D9/667—Multi-station furnaces
- C21D9/67—Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
A control method for annealing prints of a 400-series stainless steel bell-type furnace belongs to the technical field of heat treatment, solves the technical problem that the annealing prints of the 400-series stainless steel after annealing in the bell-type furnace are difficult to eliminate, and controls the fan frequency, hydrogen flow and tapping temperature of a furnace platform, and comprises the following steps: 1) controlling the frequency of a furnace platform fan: the frequency of a furnace platform fan is set to be 65Hz in the processes of heating and cooling; the frequency of a furnace platform fan is kept at 48Hz in the heat preservation process; 2) controlling the hydrogen flow: hydrogen purging is carried out for 2h when the temperature rise is started, and the hydrogen flow is 10m 3/h; hydrogen is not introduced in the heat preservation process; hydrogen purging is carried out for 1h before the heat preservation is finished, and the hydrogen flow is 15m 3/h; 3) and the discharging temperature of the bell-type furnace is controlled below 245 ℃. The method reduces the degradation rate of the 400 series stainless steel annealed imprint defect to be within 0.5 percent, effectively reduces degradation loss and improves the quality of products.
Description
Technical Field
The invention belongs to the technical field of heat treatment, and particularly relates to a control method of a 400-series stainless steel cover type furnace annealing stamp.
Background
Since 400-series ferritic stainless steel is inexpensive and has superior stress corrosion resistance to chloride, caustic alkali and the like as compared with austenitic stainless steel, it is widely used in the industries of light industrial utensils, kitchen equipment, transportation, food processing, textile industry and the like.
In order to improve cold rolling processing performance and crystal grain structure, a hot rolled coil needs to be processed in a cold rolling factory after being annealed by a bell type furnace, but after 400-series ferritic stainless steel is annealed by the bell type furnace, the edge part and the middle part of a strip steel have color difference and bluish surface, the color difference is difficult to eliminate even after pickling and rolling, the cold rolling degradation amount is obviously increased, the annealing printing degradation ratio is up to 3.95% at the highest, the contract can not be honored, the product degradation loss is caused, and the normal production operation is seriously influenced.
Disclosure of Invention
In order to overcome the defects in the prior art and solve the technical problem that the annealing mark of 400 series stainless steel after being annealed by a bell-type furnace is difficult to eliminate, the invention provides a control method of the annealing mark of the 400 series stainless steel bell-type furnace, which reduces degradation loss and improves the customer satisfaction.
Compared with the prior art, the invention is realized by the following technical scheme.
A control method for annealing prints of a 400-series stainless steel bell-type furnace controls the fan frequency, hydrogen flow and tapping temperature of a furnace platform, and comprises the following steps:
1) controlling the frequency of a furnace platform fan: the frequency of a furnace platform fan is set to be 65Hz in the processes of heating and cooling; the frequency of a furnace platform fan is kept at 48Hz in the heat preservation process;
2) controlling the hydrogen flow: hydrogen purging was carried out for 2 hours at the start of temperature rise, with a hydrogen flow of 10m3H; hydrogen is not introduced in the heat preservation process; hydrogen purging is carried out for 1h before the heat preservation is finished, and the hydrogen flow is 15m3/h；
3) And the discharging temperature of the bell-type furnace is controlled below 245 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the control method for the annealing stamp of the 400-series stainless steel hood-type furnace has obvious practical use effect, the defect degradation rate of the 400-series stainless steel annealing stamp is reduced to be within 0.5% from 3.95% before implementation, the degradation loss is effectively reduced, and the product quality is improved. The annual production 400 series stainless steel annealed coils are calculated to be 84.7 ten thousand tons, the degradation loss per ton steel is 600 yuan, and the annual degradation loss can be reduced by =84.7 ten thousand tons (3.95% -0.5%) 600 yuan/ton =1753.29 ten thousand yuan, so that the contract is guaranteed to be honored on time, and the customer satisfaction is improved.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the examples follow conventional experimental conditions. In addition, it will be apparent to those skilled in the art that various modifications or improvements can be made to the material components and amounts in these embodiments without departing from the spirit and scope of the invention as defined in the appended claims.
In order to test the influence of different process parameters and equipment parameters in the annealing process of the bell-type furnace on the uniformity of the temperature field of the steel coil and determine the optimal parameters, the following technical scheme is adopted in the embodiment:
1. selecting a test steel coil to be opened and horizontally rewound, and respectively inserting steel plates into the inner ring, the middle ring and the outer ring of the steel coil during the rewinding to form gaps for accommodating thermocouples so as to accurately monitor the temperatures of the steel coil at different positions;
2. loading the test steel coil into a furnace and inserting a thermocouple, circularly performing the process of loading one coil → inserting the thermocouple on the coil → loading another coil till 4 black skin coils are loaded into the furnace and inserted with the thermocouple, and performing the process according to a normal annealing process after adding an inner cover;
3. for factors affecting the annealing temperature uniformity of the bell type furnace: hydrogen flow, furnace platform fan frequency, furnace outlet temperature and the like, and performing single-factor change comparison tests of different factors;
4. finally, the optimal process and equipment parameters are determined, the control method for solving the annealing mark is determined, and the summary is as follows:
1) controlling the frequency of a furnace platform fan: the frequency of a furnace platform fan is set to be 65Hz in the processes of heating and cooling; the frequency of a furnace platform fan is kept at 48Hz in the heat preservation process;
2) controlling the hydrogen flow: hydrogen purging was carried out for 2 hours at the start of temperature rise, with a hydrogen flow of 10m3H; hydrogen is not introduced in the heat preservation process; hydrogen purging is carried out for 1h before the heat preservation is finished, and the hydrogen flow is 15m3/h；
3) And the discharging temperature of the bell-type furnace is controlled below 245 ℃.
By controlling the parameters of the embodiment, the edge and the middle surface of the strip steel have no color difference, no bluing and smooth surface, and the degradation rate of the 400 series stainless steel annealing mark defects is reduced to be within 0.5 percent from 3.95 percent before implementation, thereby effectively reducing the degradation loss and improving the product quality.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (1)
1. A control method for annealing prints of a 400-series stainless steel bell-type furnace is characterized by comprising the following steps:
1) controlling the frequency of a furnace platform fan: the frequency of a furnace platform fan is set to be 65Hz in the processes of heating and cooling; the frequency of a furnace platform fan is kept at 48Hz in the heat preservation process;
2) controlling the hydrogen flow: hydrogen purging was carried out for 2 hours at the start of temperature rise, with a hydrogen flow of 10m3H; hydrogen is not introduced in the heat preservation process; hydrogen purging is carried out for 1h before the heat preservation is finished, and the hydrogen flow is 15m3/h；
3) And the discharging temperature of the bell-type furnace is controlled below 245 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111320979.7A CN114045380A (en) | 2021-11-09 | 2021-11-09 | Control method for annealing stamp of 400 series stainless steel bell-type furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111320979.7A CN114045380A (en) | 2021-11-09 | 2021-11-09 | Control method for annealing stamp of 400 series stainless steel bell-type furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114045380A true CN114045380A (en) | 2022-02-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111320979.7A Pending CN114045380A (en) | 2021-11-09 | 2021-11-09 | Control method for annealing stamp of 400 series stainless steel bell-type furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114045380A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114921621A (en) * | 2022-06-14 | 2022-08-19 | 山西太钢不锈钢股份有限公司 | Setting method of furnace platform motor of all-hydrogen bell-type furnace |
| CN114959194A (en) * | 2022-05-07 | 2022-08-30 | 宁波宝新不锈钢有限公司 | Cover type annealing process for hot-rolled ferritic stainless steel |
| CN115584384A (en) * | 2022-10-19 | 2023-01-10 | 攀钢集团攀枝花钢钒有限公司 | Method and system for processing high-temperature test incompatibility of bell-type furnace |
Citations (7)
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|---|---|---|---|---|
| RU2293772C1 (en) * | 2005-07-04 | 2007-02-20 | Открытое акционерное общество "Магнитогорский металлургический комбинат" | Coil annealing method in hood furnace |
| CN101812584A (en) * | 2010-05-06 | 2010-08-25 | 山西太钢不锈钢股份有限公司 | Method for blowing hydrogen in cover annealing |
| RU2010132824A (en) * | 2010-08-04 | 2012-02-10 | Открытое акционерное общество "Северсталь" (ОАО "Северсталь") (RU) | METHOD OF ANNEALING IN A COOKING FURNACE |
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-
2021
- 2021-11-09 CN CN202111320979.7A patent/CN114045380A/en active Pending
Patent Citations (7)
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| RU2010132824A (en) * | 2010-08-04 | 2012-02-10 | Открытое акционерное общество "Северсталь" (ОАО "Северсталь") (RU) | METHOD OF ANNEALING IN A COOKING FURNACE |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114959194A (en) * | 2022-05-07 | 2022-08-30 | 宁波宝新不锈钢有限公司 | Cover type annealing process for hot-rolled ferritic stainless steel |
| CN114921621A (en) * | 2022-06-14 | 2022-08-19 | 山西太钢不锈钢股份有限公司 | Setting method of furnace platform motor of all-hydrogen bell-type furnace |
| CN114921621B (en) * | 2022-06-14 | 2023-09-05 | 山西太钢不锈钢股份有限公司 | Setting method of all-hydrogen bell-type furnace hearth motor |
| CN115584384A (en) * | 2022-10-19 | 2023-01-10 | 攀钢集团攀枝花钢钒有限公司 | Method and system for processing high-temperature test incompatibility of bell-type furnace |
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Application publication date: 20220215 |