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 PDF

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Publication number
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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CN
China
Prior art keywords
annealing
furnace
stainless steel
hydrogen
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111320979.7A
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Chinese (zh)
Inventor
赵新刚
成磊
谢璐
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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Application filed by Shanxi Taigang Stainless Steel Co Ltd filed Critical Shanxi Taigang Stainless Steel Co Ltd
Priority to CN202111320979.7A priority Critical patent/CN114045380A/en
Publication of CN114045380A publication Critical patent/CN114045380A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76Adjusting the composition of the atmosphere
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D11/00Process control or regulation for heat treatments
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54Furnaces for treating strips or wire
    • C21D9/663Bell-type furnaces
    • C21D9/667Multi-station furnaces
    • C21D9/67Multi-station furnaces adapted for treating the charge in vacuum or special atmosphere

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  • 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

Control method for annealing stamp of 400 series stainless steel bell-type furnace
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 ℃.
CN202111320979.7A 2021-11-09 2021-11-09 Control method for annealing stamp of 400 series stainless steel bell-type furnace Pending CN114045380A (en)

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

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Cited By (3)

* Cited by examiner, † Cited by third party
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

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RU2293772C1 (en) * 2005-07-04 2007-02-20 Открытое акционерное общество "Магнитогорский металлургический комбинат" Coil annealing method in hood furnace
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CN103276191A (en) * 2013-06-06 2013-09-04 攀钢集团攀枝花钢钒有限公司 Purge method for annealing of low-carbon cold-roll steel sheets
CN107828959A (en) * 2017-11-20 2018-03-23 山西太钢不锈钢股份有限公司 Reduce the bell furnace method for blowing hydrogen of high-grade hot rolling yoke steel surface aberration
CN113430339A (en) * 2021-06-04 2021-09-24 唐山钢铁集团有限责任公司 Control method of protective atmosphere of bell-type annealing furnace

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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
CN102994708A (en) * 2012-10-16 2013-03-27 天津市亿博制钢有限公司 Cover-type furnace annealing process
CN103276191A (en) * 2013-06-06 2013-09-04 攀钢集团攀枝花钢钒有限公司 Purge method for annealing of low-carbon cold-roll steel sheets
CN107828959A (en) * 2017-11-20 2018-03-23 山西太钢不锈钢股份有限公司 Reduce the bell furnace method for blowing hydrogen of high-grade hot rolling yoke steel surface aberration
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Cited By (4)

* Cited by examiner, † Cited by third party
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