CN112239841B - Control method for edge pocking mark defects of continuous hot-dip galvanized strip steel - Google Patents
Control method for edge pocking mark defects of continuous hot-dip galvanized strip steel Download PDFInfo
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- 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
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- 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
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- 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
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
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Abstract
The invention discloses a method for controlling pockmark defects at the edge of continuous hot-dip galvanized strip steel, and belongs to the technical field of galvanized plate processing. The method comprises the following steps: the method comprises the following steps: hot alkali immersion cleaning; step two: alkali scrubbing; step three: electrolytic cleaning; step four: hot water scrubbing; step five: annealing, wherein the dew point of the annealing furnace is accurately controlled by adopting a closed loop humidification system, an oxygen content analyzer is installed at the pipeline of a circulating fan at the cooling section of the annealing furnace, and the oxygen content of flowing gas at the cooling circulating fan is detected in real time; the invention controls the cleaning and annealing processes, realizes effective control and prevention of pockmark defects on the surface of a continuous hot-dip galvanized product through optimized matching of continuous hot-dip galvanizing cleaning and annealing processes and equipment and through controlling the atmosphere of a galvanizing annealing furnace, the hydrogen content of the annealing furnace and the cooling temperature of the annealing furnace, realizes effective control of the pockmark defects on the edge of the strip steel, reduces the internal yield loss of the product and improves the product quality.
Description
Technical Field
The invention relates to the technical field of galvanized sheet processing, in particular to a control method for edge pocking mark defects of continuous hot-dip galvanized strip steel.
Background
With the continuous improvement of the quality and the coating process of user products such as household appliances, automobiles and the like, the tolerance of the galvanized product to surface defects is further improved. In order to fully meet the requirements of users, the problems of feedback of galvanized products at downstream users are collected and summarized, wherein fine point defects existing on the galvanized surface influence the overall improvement of the surface quality of finished parts to a certain extent, and end users complain about the defects. Further analysis of the fine point defects on the surface of the galvanized product mainly results in 3 types: edge pockmark defects, pit defects and plating missing defects. The defects of the plating leakage and the pits are eliminated by the improvement of the galvanizing cleaning section and the process of the tower top roller respectively, but the defect of the pockmark is not effectively solved due to the special cause of the pockmark. The order exchange of galvanized automobile outer plate products is severely restricted, and the customer satisfaction degree is influenced. In order to ensure effective cashing of galvanized automobile outer plate products, further reduce internal quality loss, further analyze the cause of side pockmark defects and establish a practical and effective control method.
Disclosure of Invention
1. Technical problems to be solved by the invention
Aiming at the defects and shortcomings in the prior art, the invention provides a control method of the edge pockmark defect of continuous hot-dip galvanized strip steel, which controls the processes of cleaning, annealing and the like, realizes effective control and prevention of the surface pockmark defect of the continuous hot-dip galvanized product through the optimized matching of continuous hot-dip galvanizing cleaning, annealing process and equipment, and through the control of the atmosphere of a galvanizing annealing furnace, the hydrogen content of the annealing furnace and the cooling temperature of the annealing furnace, realizes the effective control of the edge pockmark defect of the strip steel, reduces the internal alteration loss of the product, improves the product quality, reduces the complaint of shrinkage cavity of downstream users, particularly automobile outer panel users after coating, and further improves the image and brand added value of the product.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a control method of edge pockmark defects of continuous hot-dip galvanized strip steel, which comprises the following steps:
the method comprises the following steps: hot alkali immersion cleaning;
step two: alkali scrubbing;
step three: electrolytic cleaning, alkali scrubbing and electrolytic scrubbing circulating tank liquor replacement are automatically controlled by programs so as to realize timed and quantitative replacement of tank liquor and ensure the activity of free alkali in the tank liquor;
step four: hot water scrubbing;
step five: annealing, wherein the hydrogen content of the cooling section of the annealing furnace is not less than 3%, the furnace hearth protection gas of the annealing furnace is diffused and replaced through a furnace zone diffusion valve, the dew point of the annealing furnace is accurately controlled by adopting a closed loop humidification system, an oxygen content analyzer is installed at the pipeline of a circulating fan of the cooling section of the annealing furnace, and the oxygen content of the flowing gas at the circulating fan of the cooling section is detected in real time;
step six: hot dip coating;
step seven: cooling after plating;
step eight: finishing;
step nine: trimming;
step ten: oiling;
step eleven: and (4) coiling.
Further, an upper limit value Vmax of the operation speed of the production line strip steel is given according to the design capacity of the production line, wherein the upper limit value Vmax is set according to the maximum design operation speed of the cleaning section strip steel, the relation is that Vmax =0.8V, and V represents the maximum design operation speed of the cleaning section cleaning strip steel.
Further, the pressing engagement amount of the brush roller is controlled to be 2mm, the length of the bristles is not less than 25mm, and the hot alkali concentration is not less than 2%.
Further, the fifth step: the diffusion valve is a proportional control regulating valve, the opening degree of the diffusion valve is not less than 5%, the gas diffusion displacement is not less than 600 cubic meters per hour, the dew point T1 at the top of the heating section of the annealing furnace is 5-10 ℃ lower than the dew point T2 at the bottom, and the dew point T3 at the cooling section of the annealing furnace is 10-20 ℃ lower than the dew point T1 at the heating section.
Further, the fifth step: the oxygen content analyzer detects the oxygen content of flowing gas at the cooling circulating fan in real time and controls the oxygen content to be less than 20ppm.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention controls the cleaning and annealing processes, realizes the effective control and prevention of pocking mark defects on the surface of continuous hot-dip galvanized products through the optimized matching of continuous hot-dip galvanizing cleaning and annealing processes and equipment and through the control of the atmosphere of the galvanizing annealing furnace, the hydrogen content of the annealing furnace and the cooling temperature of the annealing furnace, realizes the effective control of the pocking mark defects on the edges of strip steel, reduces the change loss in the products, improves the product quality, reduces the complaint of shrinkage holes after coating by downstream users, particularly automobile outer panel users, and further improves the product image and brand additional value.
Drawings
FIG. 1 is a schematic view of the bath displacement control of the present invention;
FIG. 2 is a schematic view of a sampling hole for detecting the dew point of an annealing furnace according to the present invention;
FIG. 3 is a schematic diagram of the oxygen content detection control according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples:
example 1
As can be seen from fig. 1 to 3, the method for controlling the edge pockmark defect of the continuous hot-dip galvanized steel strip of the embodiment includes the following steps:
the method comprises the following steps: hot alkali immersion cleaning, namely, the strip steel in a hot alkali immersion cleaning circulating tank is subjected to alkali liquor immersion action to ensure that residual oil stains on the surface of the strip steel are subjected to chemical reaction with free alkali, and the strip steel is regularly and quantitatively replaced by tank liquor to achieve the aim of pre-cleaning the strip steel;
step two: alkali scrubbing, wherein the replacement of the tank liquor of an alkali scrubbing circulating tank is automatically controlled by a program, so that the tank liquor can be replaced regularly and quantitatively, and oil stains on the surface of the strip steel are removed by the friction of a constant-speed brush roll and the strip steel;
step three: electrolytic cleaning, alkali scrubbing and electrolytic scrubbing are carried out to circulate tank liquor replacement, and program automatic control is adopted to realize timing and quantitative replacement of the tank liquor so as to ensure the activity of free alkali in the tank liquor;
step four: hot water scrubbing, wherein a program transverse temperature automatic control system and a tank liquor manual replacement system are adopted in a hot water scrubbing tank, and real-time stable control of residual components on the surface of the strip steel can be realized through a conductivity closed-loop control system;
step five: annealing, wherein the hydrogen content of a cooling section of an annealing furnace is not less than 3%, the protective gas of a hearth of the annealing furnace is diffused and replaced through a furnace area diffusing valve, the diffusing valve is a proportional control regulating valve, the opening degree of the diffusing valve is not less than 5%, the gas diffusing and replacing quantity is not less than 600 cubic meters per hour, as shown in figure 2-3, four dew point detection sampling holes are respectively arranged at the top and the bottom of a heating section of the annealing furnace and parallel to the axial lead of a roller of the furnace, the detection sampling holes are arranged at equal intervals of 4m, the dew point T1 at the top of the heating section of the annealing furnace is 5-10 ℃ lower than the dew point T2 at the bottom, the dew point T3 at the cooling section of the annealing furnace is 10-20 ℃ lower than the dew point T1 of the heating section, the dew point of the annealing furnace is accurately controlled by adopting a closed loop humidification system, the air inlet of a circulating fan pipeline of the cooling section of the annealing furnace is provided with oxygen content analyzer detection points O2ppm1 and O2ppm1, the pipeline of the cooling section of the annealing furnace is provided with an oxygen content analyzer, and the flowing gas at the cooling section of the cooling fan is detected in real time, and the oxygen content is controlled to be less than 20ppm;
step six: hot dip coating, namely continuously running strip steel enters constant-temperature molten zinc liquid and a zinc coating with a certain thickness is given to the surface of the strip steel through the blowing action of an air knife;
step seven: cooling after plating, adopting a variable-frequency and constant-speed motor to drive, and blowing air to the surface of the strip steel to achieve the purpose of cooling the strip steel;
step eight: finishing, namely dividing an upper supporting roller, a lower supporting roller and an upper working roller and a lower working roller in a four-roller mode, wherein the upper supporting roller and the lower supporting roller are both provided with a transmission motor, and the working rollers are directly contacted with the strip steel and are copied to the surface of the strip steel with certain roughness;
step nine: trimming, namely, the gap and the meshing amount of the shearing edge can be accurately adjusted, and the fixed-length width of the strip steel can be accurately controlled;
step ten: oiling, namely coating oil product particles on the surface of the strip steel through electrostatic adsorption to achieve the purpose of rust prevention of the product;
step eleven: and (4) coiling, wherein a constant tension coiling mode is adopted, and different coiling lengths can be set according to the requirements of the weight of the strip steel.
The maximum operation speed of a cleaning section of a continuous hot galvanizing production line is generally designed according to the important basis that the reflectivity of the cleaned strip steel is more than or equal to 90 percent, the circulation flow rate of a degreasing solution and the volume of a circulation groove body are designed, the upper limit value Vmax of the operation speed of the strip steel of the production line is given according to the design capacity of the production line, the upper limit value Vmax is set according to the maximum designed operation speed of the strip steel of the cleaning section, the relation is Vmax =0.8V, and V represents the maximum designed operation speed of the cleaned strip steel of the cleaning section.
As shown in figure 1, the pressed engagement amount of the brush roller is controlled to be 2mm, the length of the brush bristles is not less than 25mm, the concentration of thermokalite is not less than 2%, the replacement of the tank liquor in the circulation tank for alkali scrubbing and electrolysis scrubbing is automatically controlled by a program, the circulation tank is started to discharge once per hour, the discharge time is 15 seconds each time, the discharge amount is about 0.5m3, and the discharge port is positioned at the position of 40mm of the bottom surface of the tank body.
The invention controls the cleaning and annealing processes, realizes effective control and prevention of pockmark defects on the surface of a continuous hot-dip galvanized product through optimized matching of continuous hot-dip galvanizing cleaning, annealing process and equipment and through controlling the atmosphere of a galvanizing annealing furnace, the hydrogen content of the annealing furnace and the cooling temperature of the annealing furnace, realizes effective control of pockmark defects on the edge of strip steel, reduces the internal yield loss of the product, improves the product quality, reduces the complaint of shrinkage cavity after coating by downstream users, particularly automobile outer panel users, and further improves the image and brand additional value of the product.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, without departing from the spirit of the present invention, a person of ordinary skill in the art should understand that the present invention shall not be limited to the embodiments and the similar structural modes without creative design.
Claims (3)
1. A control method for edge pockmark defects of continuous hot-dip galvanized strip steel is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: hot alkali immersion cleaning;
step two: alkali scrubbing;
step three: electrolytic cleaning, alkali scrubbing and electrolytic scrubbing are carried out to circulate tank liquor replacement, and program automatic control is adopted to realize timing and quantitative replacement of the tank liquor so as to ensure the activity of free alkali in the tank liquor;
step four: hot water scrubbing;
step five: annealing, wherein the hydrogen content of the cooling section of the annealing furnace is not lower than 3%, the protective gas of the hearth of the annealing furnace is diffused and replaced through a furnace area diffusion valve, the dew point of the annealing furnace is accurately controlled by adopting a closed loop humidification system, an oxygen content analyzer is installed at the pipeline of a circulating fan of the cooling section of the annealing furnace, and the oxygen content of the flowing gas at the cooling circulating fan is detected in real time;
the diffusion valve is a proportional control regulating valve, the opening degree of the diffusion valve is not less than 5%, the gas diffusion displacement is not less than 600 cubic meters per hour, the dew point T1 at the top of the heating section of the annealing furnace is 5-10 ℃ lower than the dew point T2 at the bottom, and the dew point T3 at the cooling section of the annealing furnace is 10-20 ℃ lower than the dew point T1 at the heating section;
the oxygen content analyzer detects the oxygen content of flowing gas at the cooling circulating fan in real time and controls the oxygen content to be less than 20ppm;
step six: hot dip coating;
step seven: cooling after plating;
step eight: finishing;
step nine: trimming;
step ten: oiling;
step eleven: and (4) coiling.
2. The method for controlling the edge pockmark defects of the continuous hot-dip galvanized steel strip as claimed in claim 1, wherein the method comprises the following steps: and giving an upper limit value Vmax of the operation speed of the strip steel of the production line according to the design capability of the production line, wherein the upper limit value Vmax is set according to the maximum design operation speed of the strip steel of the cleaning section, the relation is that Vmax =0.8V, and V represents the maximum design operation speed of the cleaning section cleaning strip steel.
3. The method for controlling the edge pockmark defects of the continuous hot-dip galvanized steel strip as claimed in claim 1, wherein the method comprises the following steps: the pressing engagement amount of the brush roll is controlled to be 2mm, the length of the bristles is not less than 25mm, and the concentration of thermokalite is not less than 2%.
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| CN202011201186.9A CN112239841B (en) | 2020-11-02 | 2020-11-02 | Control method for edge pocking mark defects of continuous hot-dip galvanized strip steel |
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| CN101078096A (en) * | 2006-05-25 | 2007-11-28 | 福建方明钢铁有限公司 | Strip steel continuous zinc heat coating process |
| CN204058600U (en) * | 2014-06-25 | 2014-12-31 | 山东舜鑫达新型建材有限公司 | A kind of strip cleaning easy to use, drying treatment system |
| CN105385815A (en) * | 2015-11-26 | 2016-03-09 | 佛山市高明区杨和金属材料专业镇技术创新中心 | Production process for hot-dip galvanized steel plate |
| CN107488782B (en) * | 2016-06-13 | 2019-02-05 | 上海梅山钢铁股份有限公司 | A kind of hot galvanizing Horizental annealer furnace rolls face foreign matter sweep-out method |
| CN111058067A (en) * | 2018-10-16 | 2020-04-24 | 天津市大港镀锌厂 | Zinc-nickel alloy electroplating process for metal surface |
| CN110423971B (en) * | 2019-08-14 | 2021-11-09 | 马鞍山钢铁股份有限公司 | Hot-dip galvanized steel plate with excellent welding performance and corrosion resistance and preparation method thereof |
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