A continuous hot base pickling process for cold rolled galvanized patterned sheet

Abstract

The present application relates to the production process of hot base cold forming coil in the cold state rolling galvanized pattern plate technical field, specifically discloses a kind of production method of continuous hot base pickling cold rolling galvanized pattern plate, and the steel billet raw material of choice rolling product is welded, scale breaking, pickling, rinsing to produce strip steel;Rolling: strip steel is rolled to produce pattern strip steel by flat liquid parameter setting, roll design and pattern bean design;Washing: through the surface iron powder of pattern strip steel in the rolling process is cleaned by washing;Galvanizing: pattern strip steel is controlled zinc layer thickness by zinc pot galvanizing process;Straightening: straightening machine corrects the shape of rolling pattern strip steel;Passivation: passivation film is applied to the surface of zinc-plated pattern strip steel by roller coating passivation machine;Cutting: pattern plate is produced by cutting pattern strip steel;The present application realizes the method that hot rolling flat coil is stably rolled to pattern plate in cold state and then directly galvanized pattern plate by optimizing pickling and cold rolling production process, which can improve the production efficiency of galvanized pattern plate and reduce production cost.

Description

Technical Field

[0001] This invention relates to the technical field of hot-based cold-formed coil rolling process for producing galvanized patterned steel sheets in a cold state, specifically to a method for producing continuously hot-based pickling and cold-rolled galvanized patterned steel sheets. Background Technology

[0002] Galvanized checkered plates are widely used due to their anti-slip and corrosion-resistant properties: (1) for passageways and work platforms in factories, warehouses, docks and other places; (2) as anti-slip steps in public and private buildings; (3) as entry steps for vehicles such as trucks and tractors, providing a safe experience for getting on and off vehicles; (4) roofs and walls: used as roof or exterior wall materials in buildings, which are both beautiful and durable.

[0003] With the development of steel rolling technology, hot-rolled patterned steel plates are being rolled thinner and thinner, which has boosted market demand for thinner galvanized patterned steel plates. At the same time, the market's increasing requirements for product quality, safety, and aesthetics have also promoted the expansion of the applications of galvanized patterned steel plates.

[0004] Conventional galvanizing mainly involves surface treatment, heating, and galvanizing of cold-rolled patterned steel sheets, which is a complex and costly process.

[0005] Currently, there are two production methods for continuously galvanized patterned steel plates: ① Using cold-rolled patterned steel plates as raw materials for galvanizing. This method is complex and costly. For example, patent application number 201910862359.2 discloses a method for producing continuously hot-dip galvanized patterned steel plates, which uses cold-rolled patterned steel plates as raw materials and produces galvanized patterned steel plates through four steps: alkaline washing and degreasing, annealing and reduction, surface galvanizing, and surface environmentally friendly fingerprint-resistant coating. ② Using hot-rolled patterned steel plates for pickling and then galvanizing. This method is limited by the production capacity of hot-rolled patterned steel plates. For example, patent application number 202410131761.4 discloses a method for producing hot-based continuously pickled galvanized patterned steel plates, which uses a continuous pickling and galvanizing unit and mainly consists of continuous pickling and continuous galvanizing of hot-rolled patterned steel plates.

[0006] Therefore, it is necessary to design a production method for continuous hot-based pickling cold-rolled galvanized patterned steel sheets to solve the problems of complex production process, low production capacity and efficiency, and high production cost of the aforementioned continuous galvanized patterned steel sheet production. Summary of the Invention

[0007] To address the problems existing in the prior art, the purpose of this invention is to provide a production method for producing patternless galvanized steel plates based on hot-base raw materials from continuous casting and rolling through a combined pickling, rolling, and galvanizing unit.

[0008] The technical solution adopted by this invention to solve its technical problem is: a method for producing continuously hot-washed cold-rolled galvanized patterned steel sheet, comprising the following steps:

[0009] S1. Select rolled steel billet raw materials and perform welding, descaling, pickling, and rinsing to produce strip steel;

[0010] S2. Rolling: Patterned strip steel is produced by rolling through leveling fluid parameter settings, roll design, and pattern bead design.

[0011] S3. Water washing: Washing removes iron powder from the surface of the patterned strip steel during the rolling process.

[0012] S4. Galvanizing: The zinc layer thickness of the patterned strip steel is controlled through a zinc pot galvanizing process.

[0013] S5. Straightening: Straightening machine straightens the shape of rolled patterned strip steel plate;

[0014] S6. Passivation: A passivation film is applied to the surface of roll-coated galvanized patterned strip steel using a roll coating passivation machine.

[0015] S7. Shearing: Cutting patterned strip steel to produce patterned plates.

[0016] Specifically, the steel billet raw material in step S1 is ESP rolled high temperature boron-added or ferritic rolled product, with a raw material thickness accuracy of ±0.04mm, yield strength ≤260MPa, cross-sectional high point ≤10μm, and raw material thickness is 1.09 times the target thickness for producing patterned plates.

[0017] Specifically, the welding in step S1 is performed using a laser welding machine. After the strip is uncoiled, it is straightened and sheared at both ends, and then fed into the laser welding machine through the wire clamping rollers for head and tail welding.

[0018] The strip steel enters the scaling machine through the inlet looper. The scaling machine adopts a one-bending-one-straightening mode, with the bending rollers having an overlap of 40-55mm and the straightening rollers having an overlap of 40-50mm. The scaling machine has an elongation of 0.4-0.6%.

[0019] Specifically, the pickling in step S1 adopts a three-stage continuous hydrochloric acid shallow tank pickling. The residual acid on the surface of the strip is squeezed off by the squeeze roller between each pickling tank. The acid temperature is 75-80℃, the concentration of pickling tank #1 is 70-90g / L, the concentration of pickling tank #2 is 120-140g / L, and the concentration of pickling tank #3 is 160-180g / L. The acid concentration of each pickling tank is automatically controlled by continuous discharge and replenishment. Waste acid is discharged by detecting the conductivity of pickling tank #1. The conductivity concentration control range is 220-280ms / cm.

[0020] The rinsing process employs a 6-stage rinsing method. In the rinsing tank, the upper and lower surfaces of the strip are cleaned with demineralized water by high-pressure rinsing spray beams. Between each rinsing stage, squeeze rollers remove residual rinsing water from the strip surface. The rinsing water temperature is controlled at 45-55℃. The final rinsing tank is heated by steam, and its conductivity is controlled to be ≤100µs / cm. Rinsing water is added continuously to dilute the solution, with replenishment occurring at 8-10 ml intervals. 3 / h, the final rinsing tank automatically flows to the next level according to the liquid level, each level of rinsing tank automatically flows to the next level of rinsing tank, and the first level rinsing tank automatically discharges waste.

[0021] Specifically, the rolling operation steps in step S2 are as follows:

[0022] S21. Rolling mode: Patterned strip steel is rolled using a leveling mill. The rolling mode is wet leveling mode, with a rolling force of 6000-10000KN, tension of 80-100KN, and bending roll of 100-300KN, achieving a rolling bead ratio of 6%-10%.

[0023] S22. Leveling fluid parameters: The leveling fluid is a lubricating leveling fluid with a concentration of 1-4%, which reduces the rolling force by 2000-3000KN.

[0024] S23. Roll Design: The rolls have a roll crown of +0.02-0.05mm, a support roll crown of +0.05-0.1mm, a support roll chamfer angle of 8-15°, and a chamfer centerline of ±600mm. The rolls are made of Cr5 high-carbon high-chromium alloy material with a hardness of 92-95HRB and a single rolling stroke of 80-100km.

[0025] S24. Patterned bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm. After rolling to the specified kilometer, the patterned roller is removed from the line for grinding. Rolling continues until the patterned bean width is ≤5.5mm. The roller is then removed from the line and the bean is re-engraved. The rolling mileage for a single engraving is 300-400km.

[0026] Specifically, the water washing in step S3 adopts a high-pressure spray desalination method on the upper surface. The surface outlet pressure of the high-pressure pump is ≥5 Bar, which washes away the iron powder on the surface of the patterned strip steel during the rolling process. The water washing outlet has two pairs of squeeze rollers and a compressed air blowing device to remove residual moisture on the surface.

[0027] Specifically, the galvanizing process in step S4 involves the following steps:

[0028] S31. Heating: The heating furnace adopts a vertical induction heating furnace. The direction of the patterned strip steel is changed by the top roller. The top temperature is controlled at 510-530℃. The heating furnace contains a protective gas containing H2 to reduce the oxides on the surface of the patterned strip steel.

[0029] S32. Zinc pot temperature control: The temperature of the zinc pot for the patterned strip steel is controlled at 470±20℃, and the temperature of the zinc pot is controlled at 465±5℃.

[0030] S33. Aluminum content control: Iron atoms on the surface of the patterned strip steel enter the zinc pot, forming Fe2Al5 scum, which floats to the surface of the zinc pot, with an Al content of 0.22-0.25%.

[0031] S34. Calculation of air knife distance: Due to the protrusion of the patterned plate bead, the distance between the air knife and the patterned strip steel has changed. In order to ensure full specification coverage, the distance between the air knife and the patterned strip steel in the patterned plate production mode is compensated. The compensation amount is 10% of the target thickness of the patterned plate, that is: distance between air knife and patterned strip steel = distance in conventional production mode + h × 10%, where h is the target thickness of the patterned plate.

[0032] S35. Air Knife Pressure Adjustment: The patterned strip has a 10% higher bead height ratio. Compared with flat galvanized products, the distance between the air knife and the strip needs to be increased. In order to control the zinc layer to meet the target requirements, the air knife pressure needs to be increased. This is adjusted by the zinc layer thickness gauge and the closed-loop control of the air knife to control the zinc layer to meet the target requirements.

[0033] Specifically, in step S5, the tension leveler is operated with an elongation of 0.4% to correct the shape of the rolled plate, and the stagger of the bending roll and the straightening roll is set to 20-35mm and 30-35mm, respectively.

[0034] Specifically, in step S6, the speed ratio of the coating roller to the unit of the roller coating passivation machine is 1:1, the pressure of the coating roller of the galvanized patterned plate is 100-130 kg, and the temperature of the dryer is controlled at 180-220℃.

[0035] Specifically, the shearing in step S7 is a correction to the calculated cutting length of the cold-rolled patterned sheet at the exit, and 10% of the thickness of the patterned strip is included as the bean height in the calculation as an influencing factor.

[0036] Patterned steel plates are produced through continuous pickling, rolling, and galvanizing processes using a production line. The main product is thin patterned steel plates with a thickness of ≤1.5mm, and the production speed is 100m-200m / min.

[0037] The present invention has the following beneficial effects:

[0038] The production method of continuous hot-based pickling and cold-rolled galvanized patterned steel sheet designed in this invention is based on hot-rolled flat coils. By optimizing the pickling and cold rolling production processes, it realizes the method of directly galvanizing patterned steel sheets after the hot-rolled flat coils are stably rolled into patterned steel sheets in a cold state. This method can improve the production efficiency of galvanized patterned steel sheets and reduce production costs. Attached Figure Description

[0039] Figure 1This is a flowchart of the production method for continuous hot-based pickling cold-rolled galvanized patterned steel sheets. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, a method for producing a continuous hot-dip pickled cold-rolled galvanized patterned steel sheet includes the following steps:

[0042] 1. Select rolled steel billet raw materials and weld, descal, pickle, and rinse to produce strip steel.

[0043] 2. Rolling: The strip steel is rolled to produce patterned strip steel by setting the leveling fluid parameters, designing the rolls, and designing the pattern beads.

[0044] 3. Water washing: Wash away the iron powder on the surface of the patterned strip steel during the rolling process by water washing.

[0045] 4. Galvanizing: The zinc layer thickness of the patterned strip steel is controlled through a zinc pot galvanizing process.

[0046] 5. Straightening: Straightening machine straightens the shape of rolled patterned strip steel plate.

[0047] 6. Passivation: A passivation film is applied to the surface of the galvanized patterned strip steel using a roller coating passivation machine.

[0048] 7. Shearing: Cutting patterned strip steel to produce patterned plates.

[0049] Example 1:

[0050] A method for producing continuously hot-washed cold-rolled galvanized patterned steel sheet includes the following steps:

[0051] 1. Raw materials: The steel billet raw materials are ESP rolled high temperature boron-added or ferritic rolled products. The thickness accuracy of the raw materials is ±0.04mm, the yield strength is 260MPa, the cross-sectional height is 10μm, and the thickness of the raw materials is 1.09 times the target thickness of the patterned plate.

[0052] 2. Welding: Welding is carried out using a laser welding machine. After the strip is uncoiled, it is straightened and sheared at both ends, and then fed into the laser welding machine through the clamping rollers for head and tail welding. This achieves the purpose of continuous production, with fast welding speed and good weld quality.

[0053] 3. Scaling: The strip steel enters the scaling machine through the inlet looper. The scaling machine adopts a one-bending-one-straightening mode, with a bending roller overlap of 40mm and a straightening roller overlap of 40mm. The scaling machine has an elongation of 0.4%.

[0054] 4. Pickling: Pickling adopts a three-stage continuous shallow hydrochloric acid pickling process. The residual acid on the surface of the strip is squeezed off by squeeze rollers between each pickling tank. The acid temperature is 75℃. The concentration of pickling tank #1 is 70g / L, pickling tank #2 is 120g / L, and pickling tank #3 is 160g / L. The acid concentration of each pickling tank is automatically controlled by continuous discharge and replenishment. Waste acid is discharged by detecting the conductivity of pickling tank #1. The conductivity concentration control range is 220ms / cm.

[0055] 5. Rinsing: Rinsing employs a 6-stage rinsing process. In the rinsing tank, the upper and lower surfaces of the strip are cleaned with demineralized water by high-pressure rinsing spray beams. Between each rinsing stage, squeeze rollers remove residual rinsing water from the strip surface. The rinsing water temperature is controlled at 45℃. The final rinsing tank is heated by steam. The conductivity of the final rinsing tank is controlled to ≤100µs / cm, and diluted by continuously adding rinsing water at 8m intervals. 3 / h, the final rinsing tank automatically flows to the next level according to the liquid level, each level of rinsing tank automatically flows to the next level of rinsing tank, and the first level rinsing tank automatically discharges waste.

[0056] 6. The specific rolling operation steps are as follows:

[0057] (1) Rolling mode: Patterned strip steel is rolled using a leveling mill. The rolling mode is wet leveling mode, with a rolling force of 6000KN, tension of 80KN, and bending roll of 100KN, achieving a rolling height ratio of 6%.

[0058] (2) Leveling fluid parameters: The leveling fluid is a lubricating leveling fluid with a concentration of 1%, which reduces the rolling force by 2000KN;

[0059] (3) Roll design: The roll adopts a roll crown of +0.02mm, a support roll crown of +0.05mm, a support roll chamfer angle of 8°, and a chamfer position center line of ±600mm. At the same time, the roll is made of Cr5 high carbon high chromium alloy material with a hardness of 92HRB and a single rolling stroke of 80Km.

[0060] (4) Patterned bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm. After rolling to the specified kilometer, the patterned roller is removed from the line for grinding. Rolling continues until the patterned bean width is ≤5.5mm. The roller is removed from the line and the bean is re-engraved. The rolling mileage of a single engraving roller is 300km.

[0061] 7. Water washing: The water washing adopts the high-pressure spray desalination method on the upper surface. The surface outlet pressure of the high-pressure pump is ≥5 Bar, which washes away the iron powder on the surface of the patterned strip steel during the rolling process. The water washing outlet has two pairs of squeeze rollers and a compressed air blowing device to remove residual moisture on the surface.

[0062] 8. The specific steps for galvanizing are as follows:

[0063] (1) Heating: The heating furnace adopts a vertical electric induction heating furnace. The direction of the patterned strip steel is changed by the furnace top roller. The furnace top temperature is controlled at 510℃. The heating furnace contains H2 protective gas to reduce the oxides on the surface of the patterned strip steel.

[0064] (2) Zinc pot temperature control: The temperature of the zinc pot for patterned strip steel is controlled at 450℃, and the temperature of the zinc pot is controlled at 460℃.

[0065] (3) Aluminum content control: Iron atoms on the surface of the patterned strip steel enter the zinc pot and form Fe2Al5 scum, which floats to the surface of the zinc pot, with an Al content of 0.22%.

[0066] (4) Calculation of air knife distance: Due to the protrusion of the patterned plate, the distance between the air knife and the patterned strip steel has changed. In order to ensure full specification coverage, the distance between the air knife and the patterned strip steel in the patterned plate production mode is compensated. The compensation amount is 10% of the target thickness of the patterned plate, that is: distance between air knife and patterned strip steel = distance in conventional production mode + h × 10%, where h is the target thickness of the patterned plate.

[0067] (5) Air knife pressure adjustment: The height ratio of patterned plate is 10%. Compared with flat galvanized products, the distance between the air knife and the strip steel needs to be increased. In order to control the zinc layer to meet the order requirements, the distance between the air knife and the patterned strip steel is increased, and the air knife pressure needs to be increased. The adjustment is made by the zinc layer thickness gauge and the air knife closed-loop control to control the zinc layer to meet the order requirements.

[0068] 9. Stretch straightening: The stretch straightening machine is used with an elongation of 0.4% to straighten the shape of the rolled plate. The overlap between the bending roll and the straightening roll is set to 20mm and 30mm, respectively.

[0069] 10. Passivation: The speed ratio of the coating roller to the unit speed of the roller passivation machine is 1:1. In order to reduce the impact of the height of the patterned plate on the wear of the coating roller, the pressure of the coating roller is reduced. The pressure of the coating roller for galvanized patterned plates is 100kg, and the temperature of the dryer is controlled at 180℃.

[0070] 11. Shearing: Correction of the cut length calculation for cold-rolled patterned steel strip. Considering the influence of bead height on the calculation of strip length, inaccurate cutting may occur. Therefore, 10% of the patterned strip thickness is included as an influencing factor in the calculation to ensure accurate strip length calculation and prevent cutting errors.

[0071] 12. Production capacity: Patterned steel plates are produced through continuous pickling, rolling and galvanizing processes using a unit. The main product is thin patterned steel plates with a thickness of ≤1.5mm, and the production speed is 100m / min.

[0072] The continuous pickling and rolling galvanizing unit directly rolls patterned steel sheets before galvanizing, achieving cold continuous pickling, rolling, and galvanizing of hot-rolled coils ≤1.5mm thick. This breaks through the size limits of galvanized patterned steel sheets and fills a market gap. The annual production capacity of cold-rolled patterned steel sheets ≤1.5mm thick reaches 50,000 tons, with sheet shape and surface quality meeting standard requirements. Based on a profit of 500 yuan / ton, this translates to an annual profit of 50,000 tons * 500 yuan / ton = 25 million yuan.

[0073] Example 2:

[0074] A method for producing continuously hot-washed cold-rolled galvanized patterned steel sheet includes the following steps:

[0075] 1. Raw materials: The steel billet raw materials are ESP rolled high temperature boron-added or ferritic rolled products. The thickness accuracy of the raw materials is ±0.04mm, the yield strength is 260MPa, the cross-sectional height is 10μm, and the thickness of the raw materials is 1.09 times the target thickness of the patterned plate.

[0076] 2. Welding: Welding is carried out using a laser welding machine. After the strip is uncoiled, it is straightened and sheared at both ends, and then fed into the laser welding machine through the clamping rollers for head and tail welding. This achieves the purpose of continuous production, with fast welding speed and good weld quality.

[0077] 3. Scaling: The strip steel enters the scaling machine through the inlet looper. The scaling machine adopts a one-bending-one-straightening mode, with a bending roller stagger of 450mm and a straightening roller stagger of 45mm. The scaling machine has an elongation of 0.5%.

[0078] 4. Pickling: Pickling adopts a three-stage continuous shallow hydrochloric acid pickling process. The residual acid on the surface of the strip is squeezed off by squeeze rollers between each pickling tank. The acid temperature is 77℃. The concentration of pickling tank #1 is 80g / L, pickling tank #2 is 130g / L, and pickling tank #3 is 170g / L. The acid concentration of each pickling tank is automatically controlled by continuous discharge and replenishment. Waste acid is discharged by detecting the conductivity of pickling tank #1. The conductivity concentration control range is 250ms / cm.

[0079] 5. Rinsing: Rinsing employs a 6-stage rinsing process. In the rinsing tank, the upper and lower surfaces of the strip are cleaned with demineralized water by high-pressure rinsing spray beams. Between each rinsing stage, squeeze rollers remove residual rinsing water from the strip surface. The rinsing water temperature is controlled at 50℃. The final rinsing tank is heated by steam. The conductivity of the final rinsing tank is controlled to ≤100µs / cm, and diluted by continuously adding rinsing water at 9m intervals. 3 / h, the final rinsing tank automatically flows to the next level according to the liquid level, each level of rinsing tank automatically flows to the next level of rinsing tank, and the first level rinsing tank automatically discharges waste.

[0080] 6. The specific rolling operation steps are as follows:

[0081] (1) Rolling mode: Patterned strip steel is rolled using a leveling mill. The rolling mode is wet leveling mode, with a rolling force of 8000KN, tension of 90KN, and bending roll of 200KN, achieving a rolling height ratio of 8%.

[0082] (2) Leveling fluid parameters: The leveling fluid is a lubricating leveling fluid with a concentration of 3%, which reduces the rolling force by 2500KN;

[0083] (3) Roll design: The roll adopts a roll crown of +0.04mm, a support roll crown of +0.08mm, a support roll chamfer angle of 11°, and a chamfer position center line of ±600mm. At the same time, the roll is made of Cr5 high carbon high chromium alloy material with a hardness of 94HRB and a single rolling stroke of 90Km.

[0084] (4) Patterned bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm. After rolling to the specified kilometer, the patterned roller is removed from the line for grinding. Rolling continues until the patterned bean width is ≤5.5mm. The roller is removed from the line and the bean is re-engraved. The rolling mileage of a single engraving roller is 350km.

[0085] 7. Water washing: The water washing adopts the high-pressure spray desalination method on the upper surface. The surface outlet pressure of the high-pressure pump is ≥5 Bar, which washes away the iron powder on the surface of the patterned strip steel during the rolling process. The water washing outlet has two pairs of squeeze rollers and a compressed air blowing device to remove residual moisture on the surface.

[0086] 8. The specific steps for galvanizing are as follows:

[0087] (1) Heating: The heating furnace adopts a vertical electric induction heating furnace. The direction of the patterned strip steel is changed by the furnace top roller. The furnace top temperature is controlled at 520℃. The heating furnace contains H2 protective gas to reduce the oxides on the surface of the patterned strip steel.

[0088] (2) Zinc pot temperature control: The temperature of the zinc pot for patterned strip steel is controlled at 470℃, and the temperature of the zinc pot is controlled at 450℃.

[0089] (3) Aluminum content control: Iron atoms on the surface of the patterned strip steel enter the zinc pot and form Fe2Al5 scum, which floats to the surface of the zinc pot, with an Al content of 0.24%.

[0090] (4) Calculation of air knife distance: Due to the protrusion of the patterned plate, the distance between the air knife and the patterned strip steel has changed. In order to ensure full specification coverage, the distance between the air knife and the patterned strip steel in the patterned plate production mode is compensated. The compensation amount is 10% of the target thickness of the patterned plate, that is: distance between air knife and patterned strip steel = distance in conventional production mode + h × 10%, where h is the target thickness of the patterned plate.

[0091] (5) Air knife pressure adjustment: The height ratio of patterned plate is 10%. Compared with flat galvanized products, the distance between the air knife and the strip steel needs to be increased. In order to control the zinc layer to meet the order requirements, the distance between the air knife and the patterned strip steel is increased, and the air knife pressure needs to be increased. The adjustment is made by the zinc layer thickness gauge and the air knife closed-loop control to control the zinc layer to meet the order requirements.

[0092] 9. Stretch straightening: The stretch straightening machine is used with an elongation of 0.4% to straighten the shape of the rolled plate. The crossover of the bending roll and the straightening roll is set to 30mm and 33mm, respectively.

[0093] 10. Passivation: The speed ratio of the coating roller to the unit speed of the roller passivation machine is 1:1. In order to reduce the impact of the height of the patterned plate on the wear of the coating roller, the pressure of the coating roller is reduced. The pressure of the coating roller for galvanized patterned plates is 120 kg, and the temperature of the dryer is controlled at 200℃.

[0094] 11. Shearing: Correction of the cut length calculation for cold-rolled patterned steel strip. Considering the influence of bead height on the calculation of strip length, inaccurate cutting may occur. Therefore, 10% of the patterned strip thickness is included as an influencing factor in the calculation to ensure accurate strip length calculation and prevent cutting errors.

[0095] 12. Production capacity: Patterned steel plates are produced through continuous pickling, rolling and galvanizing processes using a unit. The main product is thin patterned steel plates with a thickness of ≤1.5mm, and the production speed is 150m / min.

[0096] The continuous pickling and rolling galvanizing unit directly rolls patterned steel sheets before galvanizing, achieving cold continuous pickling, rolling, and galvanizing of hot-rolled coils ≤1.5mm thick. This breaks through the size limits of galvanized patterned steel sheets and fills a market gap. The annual production capacity of cold-rolled patterned steel sheets ≤1.5mm thick reaches 60,000 tons, with sheet shape and surface quality meeting standard requirements. Based on a profit of 500 yuan / ton, this translates to an annual profit of 60,000 tons * 500 yuan / ton = 30 million yuan.

[0097] Example 3:

[0098] A method for producing continuously hot-washed cold-rolled galvanized patterned steel sheet includes the following steps:

[0099] 1. Raw materials: The steel billet raw materials are ESP rolled high temperature boron-added or ferritic rolled products. The thickness accuracy of the raw materials is ±0.04mm, the yield strength is 260MPa, the cross-sectional height is 10μm, and the thickness of the raw materials is 1.09 times the target thickness of the patterned plate.

[0100] 2. Welding: Welding is carried out using a laser welding machine. After the strip is uncoiled, it is straightened and sheared at both ends, and then fed into the laser welding machine through the clamping rollers for head and tail welding. This achieves the purpose of continuous production, with fast welding speed and good weld quality.

[0101] 3. Scaling: The strip steel enters the scaling machine through the inlet looper. The scaling machine adopts a one-bending-one-straightening mode, with a bending roller stagger of 55mm and a straightening roller stagger of 50mm. The scaling machine elongation is 0.6%.

[0102] 4. Pickling: Pickling adopts a three-stage continuous shallow hydrochloric acid pickling process. The residual acid on the surface of the strip is squeezed off by squeeze rollers between each pickling tank. The acid temperature is 80℃. The concentration of pickling tank #1 is 90g / L, pickling tank #2 is 140g / L, and pickling tank #3 is 180g / L. The acid concentration of each pickling tank is automatically controlled by continuous discharge and replenishment. Waste acid is discharged by detecting the conductivity of pickling tank #1. The conductivity concentration control range is 280ms / cm.

[0103] 5. Rinsing: Rinsing employs a 6-stage rinsing process. In the rinsing tank, the upper and lower surfaces of the strip are cleaned with demineralized water by high-pressure rinsing spray beams. Between each rinsing stage, squeeze rollers remove residual rinsing water from the strip surface. The rinsing water temperature is controlled at 55℃. The final rinsing tank is heated by steam. The conductivity of the final rinsing tank is controlled to ≤100µs / cm, and diluted by continuously adding rinsing water at 10m³ / min. 3 / h, the final rinsing tank automatically flows to the next level according to the liquid level, each level of rinsing tank automatically flows to the next level of rinsing tank, and the first level rinsing tank automatically discharges waste.

[0104] 6. The specific rolling operation steps are as follows:

[0105] (1) Rolling mode: Patterned strip steel is rolled using a leveling mill. The rolling mode is wet leveling mode, with a rolling force of 10000KN, tension of 100KN, and bending roll of 300KN, achieving a rolling height ratio of 10%.

[0106] (2) Leveling fluid parameters: The leveling fluid is a lubricating leveling fluid with a concentration of 4%, which reduces the rolling force by 3000KN;

[0107] (3) Roll design: The roll adopts a roll crown of +0.05mm, a support roll crown of +0.1mm, a support roll chamfer angle of 15°, and a chamfer position center line of ±600mm. At the same time, the roll is made of Cr5 high carbon high chromium alloy material with a hardness of 95HRB and a single rolling stroke of 100Km.

[0108] (4) Patterned bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm. After rolling to the specified kilometer, the patterned roller is removed from the line for grinding. Rolling continues until the patterned bean width is ≤5.5mm. The roller is removed from the line and the bean is re-engraved. The rolling mileage of a single engraving roller is 400km.

[0109] 7. Water washing: The water washing adopts the high-pressure spray desalination method on the upper surface. The surface outlet pressure of the high-pressure pump is ≥5 Bar, which washes away the iron powder on the surface of the patterned strip steel during the rolling process. The water washing outlet has two pairs of squeeze rollers and a compressed air blowing device to remove residual moisture on the surface.

[0110] 8. The specific steps for galvanizing are as follows:

[0111] (1) Heating: The heating furnace adopts a vertical electric induction heating furnace. The direction of the patterned strip steel is changed by the top roller of the furnace. The temperature of the top of the furnace is controlled at 530℃. The heating furnace contains H2 protective gas to reduce the oxides on the surface of the patterned strip steel.

[0112] (2) Zinc pot temperature control: The temperature of the zinc pot for the patterned strip steel is controlled at 490℃, and the temperature of the zinc pot is controlled at 470℃.

[0113] (3) Aluminum content control: Iron atoms on the surface of the patterned strip steel enter the zinc pot and form Fe2Al5 scum, which floats to the surface of the zinc pot, with an Al content of 0.25%.

[0114] (4) Calculation of air knife distance: Due to the protrusion of the patterned plate, the distance between the air knife and the patterned strip steel has changed. In order to ensure full specification coverage, the distance between the air knife and the patterned strip steel in the patterned plate production mode is compensated. The compensation amount is 10% of the target thickness of the patterned plate, that is: distance between air knife and patterned strip steel = distance in conventional production mode + h × 10%, where h is the target thickness of the patterned plate.

[0115] (5) Air knife pressure adjustment: The height ratio of patterned plate is 10%. Compared with flat galvanized products, the distance between the air knife and the strip steel needs to be increased. In order to control the zinc layer to meet the order requirements, the distance between the air knife and the patterned strip steel is increased, and the air knife pressure needs to be increased. The adjustment is made by the zinc layer thickness gauge and the air knife closed-loop control to control the zinc layer to meet the order requirements.

[0116] 9. Stretch straightening: The stretch straightening machine is used with an elongation of 0.4% to straighten the shape of the rolled plate. The overlap between the bending roll and the straightening roll is set to 35mm and 35mm respectively.

[0117] 10. Passivation: The speed ratio of the coating roller to the unit speed of the roller passivation machine is 1:1. In order to reduce the impact of the height of the patterned plate on the wear of the coating roller, the pressure of the coating roller is reduced. The pressure of the coating roller for galvanized patterned plates is 130 kg, and the temperature of the dryer is controlled at 220℃.

[0118] 11. Shearing: Correction of the cut length calculation for cold-rolled patterned steel strip. Considering the influence of bead height on the calculation of strip length, inaccurate cutting may occur. Therefore, 10% of the patterned strip thickness is included as an influencing factor in the calculation to ensure accurate strip length calculation and prevent cutting errors.

[0119] 12. Production capacity: Patterned steel plates are produced through continuous pickling, rolling and galvanizing processes using a unit. The main product is thin patterned steel plates with a thickness of ≤1.5mm, and the production speed is 200m / min.

[0120] The continuous pickling and rolling galvanizing unit directly rolls patterned steel sheets before galvanizing, achieving cold continuous pickling, rolling, and galvanizing of hot-rolled coils ≤1.5mm thick. This breaks through the size limits of galvanized patterned steel sheets and fills a market gap. The annual production capacity of cold-rolled patterned steel sheets ≤1.5mm thick reaches 70,000 tons, with sheet shape and surface quality meeting standard requirements. Based on a profit of 500 yuan / ton, this translates to an annual profit of 70,000 tons * 500 yuan / ton = 35 million yuan.

[0121] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0122] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A method for producing continuously hot-washed cold-rolled galvanized patterned steel sheet, characterized in that, Includes the following steps: S1. Select rolled steel billet raw materials for welding, descaling, pickling, and rinsing to produce strip steel; the steel billet raw materials are ESP rolled high temperature boron-added or ferritic rolled products, with a raw material thickness accuracy of ±0.04mm, yield strength ≤260MPa, cross-sectional high point ≤10μm, and raw material thickness is 1.09 times the target thickness for producing patterned plates; pickling adopts 3-stage continuous hydrochloric acid shallow tank pickling, and the residual acid on the surface of the strip steel is squeezed off by squeeze rollers between each pickling tank, the acid temperature is 75-80℃, the concentration of pickling tank #1 is 70-90g / L, the concentration of pickling tank #2 is 120-140g / L, and the concentration of pickling tank #3 is 160-180g / L. The acid concentration of each pickling tank is automatically controlled by continuous discharge and replenishment, and waste acid is discharged by detecting the conductivity of pickling tank #1, with the conductivity concentration control range of 220-280ms / cm; S2. Rolling: Patterned strip steel is produced by rolling through leveling fluid parameter settings, roll design, and pattern bead design; the specific rolling operation steps are as follows: S21. Rolling mode: Patterned strip steel is rolled using a leveling mill. The rolling mode is wet leveling, with a rolling force of 6000-10000KN, tension of 80-100KN, and bending roll of 100-300KN, achieving a rolling bead ratio of 6%-10%. S22. Leveling fluid parameters: The leveling fluid is a lubricating leveling fluid with a concentration of 1-4%, which reduces the rolling force by 2000-3000KN. S23. Roll Design: The rolls have a roll crown of +0.02-0.05mm, a support roll crown of +0.05-0.1mm, a support roll chamfer angle of 8-15°, and a chamfer centerline of ±600mm. The rolls are made of Cr5 high-carbon high-chromium alloy material with a hardness of 92-95HRB and a single rolling stroke of 80-100km. S24. Patterned bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm. After rolling to the specified kilometer, the patterned roller is removed from the line for grinding. Rolling continues until the patterned bean width is ≤5.5mm. The roller is then removed from the line and the bean is re-engraved. The rolling mileage for a single engraving is 300-400km. S3. Water washing: Washing removes iron powder from the surface of the patterned strip steel during the rolling process. S4. Galvanizing: The zinc layer thickness of the patterned strip steel is controlled through a zinc pot galvanizing process. S5. Straightening: Straightening machine straightens the shape of rolled patterned strip steel plate; S6. Passivation: A passivation film is applied to the surface of roll-coated galvanized patterned strip steel using a roll coating passivation machine. S7. Shearing: Cutting patterned strip steel to produce patterned plates.

2. The production method of continuous hot-based pickling cold-rolled galvanized patterned steel sheet according to claim 1, characterized in that, The welding in step S1 is performed using a laser welding machine. After the strip is uncoiled, it is straightened and sheared at the head and tail, and then fed into the laser welding machine through the wire clamping rollers for head and tail welding. The strip steel enters the scaling machine through the inlet looper. The scaling machine adopts a one-bending-one-straightening mode, with the bending rollers having an overlap of 40-55mm and the straightening rollers having an overlap of 40-50mm. The scaling machine has an elongation of 0.4-0.6%.

3. The production method of continuously hot-washed cold-rolled galvanized patterned steel sheet according to claim 1, characterized in that, The rinsing in step S1 employs a 6-stage rinsing process. In the rinsing tank, the upper and lower surfaces of the strip are cleaned with demineralized water by high-pressure rinsing spray beams. Residual rinsing water is squeezed off the strip surface between each rinsing stage using squeeze rollers. The rinsing water temperature is controlled at 45-55℃. The final rinsing tank is heated by steam, and its conductivity is controlled to be ≤100µs / cm. Rinsing water is added continuously to dilute the solution, with replenishment occurring at 8-10 ml intervals. 3 / h, the final rinsing tank automatically flows to the next level according to the liquid level, each level of rinsing tank automatically flows to the next level of rinsing tank, and the first level rinsing tank automatically discharges waste.

4. The production method of continuous hot-based pickling cold-rolled galvanized patterned steel sheet according to claim 1, characterized in that, The water washing in step S3 adopts the high-pressure spray desalination method on the upper surface. The surface outlet pressure of the high-pressure pump is ≥5 Bar, which washes away the iron powder on the surface of the patterned strip steel during the rolling process. The water washing outlet has two pairs of squeeze rollers and a compressed air blowing device to remove residual moisture on the surface.

5. The method for producing continuously hot-washed cold-rolled galvanized patterned steel sheet according to claim 1, characterized in that, The specific steps for galvanizing in step S4 are as follows: S41. Heating: The heating furnace adopts a vertical induction heating furnace. The direction of the patterned strip steel is changed by the top roller. The top temperature is controlled at 510-530℃. The heating furnace contains a protective gas containing H2 to reduce the oxides on the surface of the patterned strip steel. S42. Zinc pot temperature control: The temperature of the patterned strip steel entering the zinc pot is controlled at 470±20℃, and the temperature of the zinc pot is controlled at 465±5℃. S43. Aluminum content control: Iron atoms on the surface of the patterned strip steel enter the zinc pot, forming Fe2Al5 dross, which floats to the surface of the zinc pot, with an Al content of 0.22-0.25%. S44. Calculation of air knife distance: Due to the protrusion of the patterned plate bead, the distance between the air knife and the patterned strip steel has changed. In order to ensure full specification coverage, the distance between the air knife and the patterned strip steel in the patterned plate production mode is compensated. The compensation amount is 10% of the target thickness of the patterned plate. S45. Air knife pressure adjustment: The height ratio of patterned strip is 6%-10%. Compared with flat galvanized products, the distance between the air knife and the strip needs to be increased. In order to control the zinc layer to meet the target requirements, the air knife pressure needs to be increased. This is adjusted by the zinc layer thickness gauge and the closed-loop control of the air knife to control the zinc layer to meet the target requirements.

6. The method for producing continuously hot-washed cold-rolled galvanized patterned steel sheet according to claim 1, characterized in that, In step S5, the tension leveler is operated with an elongation of 0.4% to correct the shape of the rolled plate. The overlap between the bending roll and the straightening roll is set to 20-35mm and 30-35mm, respectively.

7. The production method of continuously hot-washed cold-rolled galvanized patterned steel sheet according to claim 1, characterized in that, In step S6, the speed ratio of the coating roller to the unit speed of the roller coating passivation machine is 1:1, the pressure of the coating roller for galvanized patterned plates is 100-130 kg, and the temperature of the dryer is controlled at 180-220℃.

8. The production method of continuously hot-washed cold-rolled galvanized patterned steel sheet according to claim 1, characterized in that, The patterned plate produced in step S7 is produced by a continuous pickling, rolling and galvanizing process by a unit, producing thin patterned plates with a thickness of ≤1.5mm at a production speed of 100m-200m / min.

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