CN111659741B - Method for controlling point rust on surface of strip steel in cold rolling continuous annealing path - Google Patents
Method for controlling point rust on surface of strip steel in cold rolling continuous annealing path Download PDFInfo
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- CN111659741B CN111659741B CN202010470116.7A CN202010470116A CN111659741B CN 111659741 B CN111659741 B CN 111659741B CN 202010470116 A CN202010470116 A CN 202010470116A CN 111659741 B CN111659741 B CN 111659741B
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- continuous annealing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
- 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
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a method for controlling point rust on the surface of strip steel in a cold rolling continuous annealing path, which comprises the following steps: (1) controlling the process of the cleaning section of the continuous annealing unit; (2) controlling the process of the annealing section of the continuous annealing unit; (3) controlling the polishing section process of the continuous annealing unit; (4) controlling an oiling section of the continuous annealing unit; (5) controlling the product in the middle of the continuous annealing line; the invention focuses on controlling the point rust defect on the surface of the strip steel of the cold rolling continuous annealing path through continuous annealing process adjustment and product warehouse area management, and finally reduces the defective rate caused by the point rust.
Description
Technical Field
The invention relates to the technical field of cold-rolled strip steel, in particular to a method for controlling point rust on the surface of the cold-rolled continuous annealing path strip steel.
Background
With the improvement of the requirements of users on the surface quality of the cold-rolled strip steel, the control of the surface defects of the cold-rolled strip steel is more and more concerned, and the control level becomes one of the key factors for supplying the cold-rolled strip steel to high-end users. The cold-rolled continuous annealing path steel plate is easy to have the defect of point rust on the surface in the production and storage processes, and because the unqualified products of the point rust not only cause a large amount of loss every year, but also cause adverse effects on subsequent use and influence the trust of customers to manufacturers.
The cold rolling and continuous rolling path point rust has many influence factors, such as internal and external factors including relative humidity and temperature of atmosphere, atmosphere components around metal, surface chemical components, physical states and medium components of a steel plate and the like. The defects have different shapes, cause and solution methods, and are a complex comprehensive problem.
Disclosure of Invention
The invention provides a method for controlling the surface spot rust of a cold-rolled continuous annealing path strip steel, which emphasizes on controlling the surface spot rust defect of the cold-rolled continuous annealing path strip steel through continuous annealing process adjustment and product warehouse area management, and finally reduces the defective rate caused by the spot rust.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for controlling the point rust on the surface of the strip steel of a cold rolling continuous annealing path comprises the following control processes:
(1) and (3) controlling the process of the cleaning section of the continuous annealing unit: the conductivity of the hot water rinsing tank is controlled to be below 20us/cm, the water temperature is controlled to be 50-70 ℃, the squeezing roller pressure is controlled to be 4-6 bar, and the temperature of an outlet drying box is controlled to be 140-160 ℃;
(2) the process control of the annealing section of the continuous annealing unit comprises the following steps: the temperature of the final cooling water quenching tank is controlled below 60 ℃, the conductivity is controlled below 20us/cm, and the pressure of the squeezing roller is controlled at 4-6 bar;
(3) the continuous annealing unit polishing section process control: controlling the air pressure of an outlet blowing air beam to be 4-6 MPa, controlling the concentration of the finishing liquid to be 3-5% and controlling the flow of the finishing liquid to be 3-5L/min;
(4) continuous annealing unit oil coating section control: in the production of intermediate products of continuous annealing unit, the light oiling is controlled to be 300-500 mg/m2A/side;
(5) and continuously annealing, and controlling the product in the middle of the line: the storage period of the intermediate product after continuous withdrawal is controlled within 5 days.
In the process of controlling the process of the finishing section of the continuous annealing unit, the air pressure of the blowing air beam at the outlet is controlled to be 5MPa, the concentration of finishing liquid is controlled to be 4%, and the flow of the finishing liquid is controlled to be 4L/min.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention focuses on controlling the technological parameters of a cleaning section, an annealing section, a finishing section, an oiling section and the like of the cold-rolled strip steel in the continuous annealing unit, strengthens the management in a product storage area, realizes the control of the spot rust defect on the surface of the cold-rolled continuous annealing path strip steel, and reduces the defective rate caused by the spot rust.
2) After the method is adopted, the defective rate caused by rust is reduced from 0.5% to 0.1%.
Detailed Description
A method for controlling the point rust on the surface of the strip steel of a cold rolling continuous annealing path comprises the following control processes:
(1) and (3) controlling the process of the cleaning section of the continuous annealing unit: the conductivity of the hot water rinsing tank is controlled to be below 20us/cm, the water temperature is controlled to be 50-70 ℃, the squeezing roller pressure is controlled to be 4-6 bar, and the temperature of an outlet drying box is controlled to be 140-160 ℃; the purpose is to prevent Na element residue in the cleaning section from forming a rust source on the surface of the steel plate.
(2) The process control of the annealing section of the continuous annealing unit comprises the following steps: the temperature of the final cooling water quenching tank is controlled below 60 ℃, the conductivity is controlled below 20us/cm, and the pressure of the squeezing roller is controlled at 4-6 bar; the purpose is to prevent the Ca element in the water quenching tank from remaining on the surface of the steel plate to form a rust source.
(3) The continuous annealing unit polishing section process control: controlling the air pressure of an outlet blowing air beam to be 4-6 MPa, controlling the concentration of the finishing liquid to be 3-5% and controlling the flow of the finishing liquid to be 3-5L/min; the purpose is to prevent the finishing liquid from remaining on the surface of the steel plate to form a rust source. Further, in the process of controlling the finishing section process of the continuous annealing unit, the air pressure of the outlet blowing air beam is controlled to be 5MPa, the concentration of finishing liquid is controlled to be 4%, and the flow of the finishing liquid is controlled to be 4L/min.
(4) Continuous annealing unit oil coating section control: in the production of intermediate products of continuous annealing unit, the light oiling is controlled to be 300-500 mg/m2A/side;
(5) and continuously annealing, and controlling the product in the middle of the line: the storage period of the product in the middle after continuous annealing is controlled within 5 days, so as to prevent the surface from being rusted due to the overdue storage of the material.
The spot rust problem of the surface of the cold-rolled steel plate in the atmospheric environment is an electrochemical corrosion process, according to the basic principle of corrosion electrochemistry, the corrosion resistance of the surface of the cold-rolled steel plate is related to the state and the potential of a surface oxide, and the more complete the oxide film is, the smaller the potential difference between the oxide and a base material is, the less rust is generated. Therefore, the residual elements on the surface of the cold-rolled steel strip are controlled, and the entry of damp air is prevented, so that the occurrence of the corrosion problem can be effectively reduced. The invention aims at the implementation process control of the cold rolling continuous annealing path strip steel, and can effectively reduce the defective rate caused by the surface spot rust defect.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
| Examples | 1 | 2 | 3 | 4 | 5 | 6 |
| Conductivity of rinsing bath, us/cm | 7 | 10 | 8 | 12 | 6 | 9 |
| Water temperature of the rinsing bath | 60 | 60 | 60 | 62 | 65 | 58 |
| Pressure of drying roller in rinsing tank, bar | 5 | 5 | 5 | 4.8 | 5.2 | 5.5 |
| Temperature of the outlet drying box,. deg.C | 152 | 150 | 151 | 146 | 156 | 148 |
| Final cold water quench tank temperature, ° c | 53 | 52 | 54 | 56 | 58 | 55 |
| Conductivity us/cm of final cooling water quenching tank | 10 | 10 | 8 | 15 | 12 | 6 |
| Bar pressure of squeezing roller of final cold water quenching tank | 5 | 5 | 5 | 4.9 | 5.5 | 5.2 |
| The air pressure of the blowing wind beam at the outlet of the finishing section is MPa | 5 | 5 | 5 | 4.8 | 5.3 | 5.5 |
| Polishing concentration,% of | 4 | 4 | 4 | 4.2 | 4.5 | 3.8 |
| Flow rate of polishing solution, L/min | 4 | 4 | 4 | 4.3 | 3.6 | 4.6 |
| Coating oil amount of mg/m2Surface of | 400 | 400 | 400 | 416 | 408 | 396 |
| Stock period, days | 4 | 4 | 3 | 2 | 3 | 1 |
| Pitting of rust | Is free of | Is free of | Is free of | Is free of | Is free of | Is free of |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. A method for controlling the point rust on the surface of the strip steel of a cold rolling continuous annealing path is characterized by comprising the following control processes:
(1) and (3) controlling the process of the cleaning section of the continuous annealing unit: the conductivity of the hot water rinsing tank is controlled to be below 20us/cm, the water temperature is controlled to be 50-70 ℃, the squeezing roller pressure is controlled to be 4-6 bar, and the temperature of an outlet drying box is controlled to be 140-160 ℃;
(2) the process control of the annealing section of the continuous annealing unit comprises the following steps: the temperature of the final cooling water quenching tank is controlled below 60 ℃, the conductivity is controlled below 20us/cm, and the pressure of the squeezing roller is controlled at 4-6 bar;
(3) the continuous annealing unit polishing section process control: controlling the air pressure of an outlet blowing air beam to be 4-6 MPa, controlling the concentration of the finishing liquid to be 3-5% and controlling the flow of the finishing liquid to be 3-5L/min;
(4) continuous annealing unit oil coating section control: when the continuous annealing unit produces an intermediate product, the light oiling is controlled to be 300-500 mg/m2A/side;
(5) continuous annealing and off-line intermediate product control: the storage period of the intermediate product after continuous withdrawal is controlled within 5 days.
2. The method for controlling the point rust on the surface of the strip steel in the cold rolling continuous annealing path according to claim 1, wherein in the process control of the finishing section of the continuous annealing unit, the wind pressure of an outlet blowing wind beam is controlled to be 5MPa, the concentration of finishing liquid is controlled to be 4%, and the flow of the finishing liquid is controlled to be 4L/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010470116.7A CN111659741B (en) | 2020-05-28 | 2020-05-28 | Method for controlling point rust on surface of strip steel in cold rolling continuous annealing path |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010470116.7A CN111659741B (en) | 2020-05-28 | 2020-05-28 | Method for controlling point rust on surface of strip steel in cold rolling continuous annealing path |
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| Publication Number | Publication Date |
|---|---|
| CN111659741A CN111659741A (en) | 2020-09-15 |
| CN111659741B true CN111659741B (en) | 2022-03-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000061566A (en) * | 1998-08-25 | 2000-02-29 | Honda Motor Co Ltd | Scrap chute in press die |
| CN201613261U (en) * | 2009-09-21 | 2010-10-27 | 上海西重所重型机械成套有限公司 | Tempering liquid treatment device of two-stand temper mill |
| CN110016630A (en) * | 2019-04-30 | 2019-07-16 | 首钢京唐钢铁联合有限责任公司 | A kind of cleaning method and device |
| CN110624957A (en) * | 2019-09-30 | 2019-12-31 | 江苏九天光电科技有限公司 | Method for controlling process lubrication system of wet temper mill set by taking roughness as target |
| CN111187890A (en) * | 2020-02-28 | 2020-05-22 | 鞍钢股份有限公司 | Method for eliminating rust of phosphorus-containing high-strength steel |
-
2020
- 2020-05-28 CN CN202010470116.7A patent/CN111659741B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000061566A (en) * | 1998-08-25 | 2000-02-29 | Honda Motor Co Ltd | Scrap chute in press die |
| CN201613261U (en) * | 2009-09-21 | 2010-10-27 | 上海西重所重型机械成套有限公司 | Tempering liquid treatment device of two-stand temper mill |
| CN110016630A (en) * | 2019-04-30 | 2019-07-16 | 首钢京唐钢铁联合有限责任公司 | A kind of cleaning method and device |
| CN110624957A (en) * | 2019-09-30 | 2019-12-31 | 江苏九天光电科技有限公司 | Method for controlling process lubrication system of wet temper mill set by taking roughness as target |
| CN111187890A (en) * | 2020-02-28 | 2020-05-22 | 鞍钢股份有限公司 | Method for eliminating rust of phosphorus-containing high-strength steel |
Non-Patent Citations (2)
| Title |
|---|
| 冷轧板黄斑缺陷的工艺研究;关淑巧 等;《第七届（2009）中国钢铁年会论文集》;20091111;第3-104～3-109页 * |
| 连续退火带钢的工艺优化及产品质量分析连续;许晓江 等;《2006年全国轧钢生产技术会议文集》;20070429;第375-377、391页 * |
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