Production method of continuous hot-based pickling cold-rolled galvanized checkered plate

Abstract

The invention relates to the technical field of a production process for rolling a galvanized checkered plate by a hot-based cold-formed coil in a cold state, and particularly discloses a production method for a continuous hot-based pickling cold-rolled galvanized checkered plate, which comprises the following steps of: selecting a rolled product billet raw material for welding, descaling, pickling and rinsing to produce strip steel; rolling: rolling the strip steel through leveling liquid parameter setting, roller design and pattern bean design to produce pattern strip steel; washing: washing iron powder on the surface of the patterned strip steel in the rolling process; zinc plating: controlling the thickness of a zinc layer of the patterned strip steel through a zinc pot zinc plating process; straightening: straightening the shape of the rolled pattern strip steel by a straightening machine; passivating: coating a passivating film on the surface of the rolled galvanized pattern strip steel by using a roller coating passivating machine; shearing: slitting the checkered strip steel to produce a checkered plate; by optimizing the pickling and cold rolling production process, the method for directly plating the checkered plate after the hot-rolled flat coil is stably rolled into the checkered plate in the cold state is achieved, the production efficiency of the galvanized checkered plate can be improved, and the production cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of production technology of rolling galvanized checkered plates from hot-base cold-formed coils in a cold state, and in particular to a production method of continuous hot-base pickling cold-rolled galvanized checkered plates. Background Art

[0002] Galvanized checkered plate is widely used due to its anti-slip and corrosion-resistant properties: (1) used for passages and work platforms in factories, warehouses, docks and other places; (2) used as anti-slip steps for stairs in public and private buildings; (3) used as entrance pedals for vehicles such as trucks and tractors to provide a safe boarding and alighting experience. (4) Roofs and walls: used as roof or exterior wall materials in buildings, it is both beautiful and durable.

[0003] With the development of steel rolling technology, hot-rolled checkered plate products are becoming thinner and thinner, which has promoted the market demand for thin-gauge galvanized checkered plates. At the same time, the market's increasing requirements for product quality, safety and aesthetics have also promoted the expansion of the use of galvanized checkered plates.

[0004] Conventional galvanizing is mainly done by cold-rolling the patterned plate for surface treatment, heating, and galvanizing. The production process is complicated and the cost is high.

[0005] At present, there are two production methods for continuous galvanized checkered plates: ① Using cold-rolled checkered plates as raw materials for galvanizing production. This method has complex processes and high production costs. For example, a method for producing continuous hot-dip galvanized checkered plates disclosed in patent application number 201910862359.2 adopts this method. This method uses cold-rolled checkered plates as raw materials, and produces galvanized checkered plates through four steps of alkaline degreasing, annealing reduction, surface galvanizing, and surface environmentally friendly fingerprint-resistant coating. ② The hot-rolled checkered plates are pickled and then galvanized. This method is limited to the production capacity of hot-rolled checkered plates. For example, a method for producing hot-based continuous pickling galvanized checkered plates disclosed in patent application number 202410131761.4 adopts this method, and uses a continuous pickling and galvanizing unit for production, which is mainly divided into continuous pickling and continuous galvanizing of hot-rolled checkered plates.

[0006] Therefore, it is necessary to design a production method for continuous hot-base pickled cold-rolled galvanized checkered plate to solve the problems of complex production process, low production capacity and efficiency, and high production cost of the above-mentioned continuous galvanized checkered plate. Summary of the invention

[0007] In view of the problems existing in the prior art, the object of the present invention is to provide a production method for producing patternless galvanized patterned plates based on continuous casting and rolling of hot-based raw materials through a pickling, rolling and galvanizing combined unit.

[0008] The technical solution adopted by the present invention to solve the technical problem is: a method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate, comprising the following steps:

[0009] S1. Select the raw material of rolled steel billet for welding, descaling, pickling and rinsing to produce strip steel;

[0010] S2, rolling: the strip steel is rolled to produce patterned strip steel through the setting of leveling liquid parameters, roller design and pattern bean design;

[0011] S3, water washing: washing away the iron powder on the surface of the patterned strip steel during the rolling process;

[0012] S4, galvanizing: The patterned strip steel is galvanized by the zinc pot process to control the thickness of the zinc layer;

[0013] S5, tensioning and straightening: the tensioning and straightening machine corrects the shape of the rolled patterned strip steel;

[0014] S6, passivation: the roller coating passivation machine applies the passivation film on the surface of the roller-pressed galvanized patterned steel strip;

[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 or ferrite rolled product, the raw material thickness accuracy is ±0.04mm, the yield strength is ≤260MPa, the cross-section high point is ≤10μm, and the raw material thickness is 1.09 times the target thickness of the patterned plate.

[0017] Specifically, the welding in step S1 adopts a laser welder, and the strip steel is straightened and sheared at the head and tail after uncoiling, and enters the laser welder through the pinch roller for head and tail welding;

[0018] The strip steel enters the descaling machine through the entrance loop. The descaling machine adopts a one-bending and one-straightening mode. The staggered degree of the bending rollers is 40-55mm, the staggered degree of the straightening rollers is 40-50mm, and the elongation of the descaling machine is 0.4-0.6%.

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

[0020] The rinsing adopts 6-stage rinsing. The upper and lower surfaces of the strip in the rinsing tank are sprayed with desalted water by high-pressure rinsing spray beams to clean the acid on the surface of the strip. The residual rinsing water on the surface of the strip is squeezed out by a squeeze roller between each level of rinsing tank; the rinsing water temperature is controlled at 45-55℃, the final rinsing tank is heated by steam, and the conductivity of the final rinsing tank is controlled to be ≤100us / cm. Rinsing water is added from time to time for dilution, and the water replenishment is based on 8-10m 3 / h, the last stage rinsing tank automatically flows to the previous stage according to the liquid level, each level of rinsing tank automatically flows to the previous stage, and the first stage rinsing tank automatically discharges waste.

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

[0022] S21. Rolling mode: The patterned strip is rolled by a flattening mill, the rolling mode adopts a wet flattening mode, the rolling force is 6000-10000KN, the tension is 80-100KN, the bending roll is 100-300KN, and the rolling bean height ratio is 6%-10%;

[0023] S22, leveling fluid parameters: the leveling fluid uses lubricating leveling fluid, the leveling fluid concentration is 1-4%, and the rolling force is reduced by 2000-3000KN;

[0024] S23, Roller design: Roller crown +0.02-0.05mm, support roller crown +0.05-0.1mm, support roller chamfer angle 8-15°, chamfer position center line ±600mm, roll is made of Cr5 high carbon high chromium alloy, hardness 92-95HRB, single rolling stroke reaches 80-100Km;

[0025] S24, pattern bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm, rolling to the kilometer number, pattern roller offline grinding, continue rolling, until the pattern bean width ≤5.5mm, roller offline re-engraving beans, a single roller engraving rolling mileage of 300-400Km.

[0026] Specifically, the water washing in step S3 adopts the method of high-pressure spraying desalted water on the surface of the line, and the surface outlet pressure of the high-pressure pump is ≥5Bar to clean the iron powder on the surface of the patterned strip steel during the rolling process. There are 2 pairs of squeeze rollers and compressed air blowing devices at the water washing outlet to remove residual moisture on the surface.

[0027] Specifically, the specific operation steps of galvanizing in step S4 are as follows:

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

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

[0030] S33, aluminum content control: iron atoms on the surface of the patterned strip enter the zinc pot, forming Fe2Al5 slag, 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 protruding height 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: the distance between the air knife and the patterned strip steel = the distance in the conventional production mode + h × 10%, where h is the target thickness of the patterned plate;

[0032] S35. Adjustment of air knife pressure: The height ratio of patterned plate is 10%. Compared with flat galvanized products, the distance between the air knife and the strip steel should be larger. In order to control the zinc layer to meet the target requirements, the distance between the air knife and the patterned strip steel becomes larger, and the air knife pressure needs to be increased. The zinc layer thickness gauge and the air knife closed-loop control are used to adjust the pressure to control the zinc layer to meet the target requirements.

[0033] Specifically, the tension leveler in step S5 is put into use with an elongation of 0.4% to correct the rolled plate shape, and the staggered degrees of the bending rolls and the straightening rolls are set to 20-35 mm and 30-35 mm.

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

[0035] Specifically, the shearing in step S7 is a correction for calculating the slitting length at the outlet of the cold-rolled patterned plate, and 10% of the thickness of the patterned strip is included as an influencing factor in the calculation;

[0036] The production of patterned plates is carried out through continuous pickling, rolling and galvanizing processes of the unit. It mainly produces thin-gauge patterned plates with a thickness of ≤1.5mm and a production speed of 100m-200m / min.

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

[0038] The production method of continuous hot-base pickled cold-rolled galvanized checkered plate designed by the present invention is based on the hot-rolled flat coil. By optimizing the pickling and cold rolling production processes, the hot-rolled flat coil is stably rolled into a checkered plate in a cold state and then directly galvanized into a checkered plate, which can improve the production efficiency of the galvanized checkered plate and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1It is a flow chart of the production method of continuous hot-base pickled cold-rolled galvanized checkered plate. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, a method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate comprises the following steps:

[0042] 1. Select rolled steel billet raw materials for welding, descaling, pickling and rinsing to produce strip steel.

[0043] 2. Rolling: The strip is rolled to produce patterned strip through setting the leveling liquid parameters, roller design and pattern bean design.

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

[0045] 4. Galvanizing: The patterned strip steel is galvanized in a zinc pot to control the thickness of the zinc layer.

[0046] 5. Tension straightening: The tension straightening machine corrects the shape of the rolled patterned strip steel plate.

[0047] 6. Passivation: The roller passivation machine applies a passivation film on the surface of the roller-pressed galvanized patterned strip steel.

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

[0049] Embodiment 1:

[0050] A method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate comprises the following steps:

[0051] 1. Raw materials: The raw materials of the steel billets are ESP rolled high temperature boron or ferrite rolled products, the raw material thickness accuracy is ±0.04mm, the yield strength is 260MPa, the section high point is 10μm, and the raw material thickness is 1.09 times the target thickness of the patterned plate.

[0052] 2. Welding: Laser welding machine is used for welding. After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the laser welding machine through the clamping roller for head and tail welding, so as to achieve the purpose of continuous production, with fast welding speed and good weld quality.

[0053] 3. Scale breaking: The strip steel enters the scale breaking machine through the entrance loop. The scale breaking machine adopts a one-bending and one-straightening mode. The staggered degree of the bending rollers is 40mm, the staggered degree of the straightening rollers is 40mm, and the elongation of the scale breaking machine is 0.4%.

[0054] 4. Pickling: Pickling adopts 3-stage continuous hydrochloric acid shallow tank pickling. The residual acid on the surface of the strip is squeezed out by a squeeze roller between each pickling tank. The acid temperature is 75°C, the concentration of the 1# pickling tank is 70g / L, the concentration of the 2# pickling tank is 120g / L, and the concentration of the 3# pickling tank is 160g / L. The pickling tanks at each level are connected in series and replenished with automatic acid concentration control. The waste acid is discharged by detecting the conductivity of the 1# pickling tank. The conductivity concentration control range is 220ms / cm.

[0055] 5. Rinsing: 6-stage rinsing is adopted. The upper and lower surfaces of the strip in the rinsing tank are sprayed with desalted water by high-pressure rinsing spray beams to clean the acid on the surface of the strip. The residual rinsing water on the surface of the strip is squeezed out by a squeeze roller between each level of rinsing tank; the rinsing water temperature is controlled at 45°C, the final rinsing tank is heated by steam, and the conductivity of the final rinsing tank is controlled to be ≤100us / cm. Rinsing water is added from time to time for dilution, and the water replenishment is based on 8m 3 / h, the last stage rinsing tank automatically flows to the previous stage according to the liquid level, each level of rinsing tank automatically flows to the previous stage, and the first stage rinsing tank automatically discharges waste.

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

[0057] (1) Rolling mode: The patterned strip is rolled using a flat-pass mill, the rolling mode uses a wet flat-pass mode, the rolling force is 6000KN, the tension is 80KN, the bending roll is 100KN, and the rolling bean height ratio is 6%;

[0058] (2) Leveling fluid parameters: The leveling fluid uses lubricating leveling fluid, the leveling fluid concentration is 1%, and the rolling force is reduced by 2000KN;

[0059] (3) Roller design: The roller crown is +0.02mm, the support roller crown is +0.05mm, the support roller chamfer angle is 8°, and the chamfer position center line is ±600mm. The roller is made of Cr5 high-carbon high-chromium alloy with a hardness of 92HRB. The single rolling stroke reaches 80km.

[0060] (4) Pattern bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm, rolling to the kilometer number, the pattern roller is ground off the line, and rolling continues until the pattern bean width ≤5.5mm, the roller is off the line and the bean is re-engraved, and the rolling mileage of a single engraved roller is 300km.

[0061] 7. Water washing: The water washing adopts the method of high-pressure spraying desalted water on the surface of the line. The surface outlet pressure of the high-pressure pump is ≥5Bar. The iron powder on the surface of the patterned strip steel during the rolling process is cleaned. There are 2 pairs of squeeze rollers and compressed air blowing devices at the water washing outlet to remove residual moisture on the surface.

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

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

[0064] (2) Zinc pot temperature control: For patterned strip, the zinc pot temperature is controlled at 450°C, and the zinc pot temperature is controlled at 460°C;

[0065] (3) Aluminum content control: Iron atoms on the surface of the patterned strip enter the zinc pot, forming Fe2Al5 slag, 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 pattern plate bean height, the distance between the air knife and the pattern strip steel has changed. In order to ensure full specification coverage, the distance between the air knife and the pattern strip steel in the pattern plate production mode is compensated. The compensation amount is 10% of the target thickness of the pattern plate, that is: the distance between the air knife and the pattern strip steel = the distance in the conventional production mode + h × 10%, where h is the target thickness of the pattern plate;

[0067] (5) Adjustment of air knife pressure: 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 becomes larger, and the air knife pressure needs to be increased. The zinc layer thickness gauge and the air knife closed-loop control are used to adjust the pressure to control the zinc layer to meet the order requirements.

[0068] 9. Tension leveling: The tension leveling machine is put into use with an elongation of 0.4% to correct the shape of the rolled plate. The staggered degree of the bending roll and the straightening roll is set to 20mm and 30mm.

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

[0070] 11. Shearing: The cold-rolled patterned plate export calculation slitting length correction, taking into account the influence of bean height on the strip length calculation, may cause inaccurate slitting. 10% of the patterned strip thickness will be included as the bean height in the calculation as an influencing factor to make the strip length calculation accurate and prevent slitting errors.

[0071] 12. Production capacity: The production of patterned plates is carried out through continuous pickling, rolling and galvanizing processes of the unit. It mainly produces thin-gauge patterned plates with a thickness of ≤1.5mm and a production speed of 100m / min.

[0072] The continuous pickling and galvanizing unit is used to directly roll the checkered plate and then galvanize it, realizing the cold continuous pickling and rolling galvanizing of ≤1.5mm hot-rolled coils, breaking the specification limit of galvanized checkered plates and filling the market gap. The annual output of ≤1.5mm cold-rolled checkered plates is 50,000 tons, and the plate shape and surface quality meet the standard requirements. According to the benefit calculation of 500 yuan / t, the annual benefit can be 50,000 tons*500 yuan / t=25 million yuan.

[0073] Embodiment 2:

[0074] A method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate comprises the following steps:

[0075] 1. Raw materials: The raw materials of the steel billets are ESP rolled high temperature boron or ferrite rolled products, the raw material thickness accuracy is ±0.04mm, the yield strength is 260MPa, the section high point is 10μm, and the raw material thickness is 1.09 times the target thickness of the patterned plate.

[0076] 2. Welding: Laser welding machine is used for welding. After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the laser welding machine through the clamping roller for head and tail welding, so as to achieve the purpose of continuous production, with fast welding speed and good weld quality.

[0077] 3. Scale breaking: The strip steel enters the scale breaking machine through the entrance loop. The scale breaking machine adopts a one-bending and one-straightening mode. The staggered degree of the bending rollers is 450mm, the staggered degree of the straightening rollers is 45mm, and the elongation of the scale breaking machine is 0.5%.

[0078] 4. Pickling: Pickling adopts 3-stage continuous hydrochloric acid shallow tank pickling. The residual acid on the surface of the strip is squeezed out by a squeeze roller between each pickling tank. The acid temperature is 77°C, the concentration of the 1# pickling tank is 80g / L, the concentration of the 2# pickling tank is 130g / L, and the concentration of the 3# pickling tank is 170g / L. The pickling tanks at each level are connected in series and replenished with automatic acid concentration control. The waste acid is discharged by detecting the conductivity of the 1# pickling tank. The conductivity concentration control range is 250ms / cm.

[0079] 5. Rinsing: 6-stage rinsing is adopted. The upper and lower surfaces of the strip in the rinsing tank are sprayed with desalted water by high-pressure rinsing spray beams to clean the acid on the surface of the strip. The residual rinsing water on the surface of the strip is squeezed out by a squeeze roller between each level of rinsing tank; the rinsing water temperature is controlled at 50°C, the final rinsing tank is heated by steam, and the conductivity of the final rinsing tank is controlled to be ≤100us / cm. Rinsing water is added from time to time for dilution, and the water replenishment is based on 9m 3 / h, the last stage rinsing tank automatically flows to the previous stage according to the liquid level, each level of rinsing tank automatically flows to the previous stage, and the first stage rinsing tank automatically discharges waste.

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

[0081] (1) Rolling mode: The patterned strip is rolled using a flat mill, the rolling mode uses a wet flattening mode, the rolling force is 8000KN, the tension is 90KN, the bending roll is 200KN, and the rolling bean height ratio is 8%;

[0082] (2) Leveling fluid parameters: The leveling fluid uses lubricating leveling fluid, the leveling fluid concentration is 3%, and the rolling force is reduced by 2500KN;

[0083] (3) Roller design: The roller crown is +0.04mm, the support roller crown is +0.08mm, the support roller chamfer angle is 11°, and the chamfer position center line is ±600mm. The roller is made of Cr5 high-carbon high-chromium alloy with a hardness of 94HRB. The single rolling stroke reaches 90km.

[0084] (4) Pattern bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm, rolling to the kilometer number, the pattern roller is ground off the line, and rolling continues until the pattern bean width ≤5.5mm, the roller is off the line and the bean is re-engraved, and the rolling mileage of a single engraved roller is 350km.

[0085] 7. Water washing: The water washing adopts the method of high-pressure spraying desalted water on the surface of the line. The surface outlet pressure of the high-pressure pump is ≥5Bar. The iron powder on the surface of the patterned strip steel during the rolling process is cleaned. There are 2 pairs of squeeze rollers and compressed air blowing devices at the water washing outlet to remove residual moisture on the surface.

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

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

[0088] (2) Zinc pot temperature control: For patterned strip, the zinc pot temperature is controlled at 470°C, and the zinc pot temperature is controlled at 450°C;

[0089] (3) Aluminum content control: Iron atoms on the surface of the patterned strip enter the zinc pot, forming Fe2Al5 slag, 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 pattern plate bean height, the distance between the air knife and the pattern strip steel has changed. In order to ensure full specification coverage, the distance between the air knife and the pattern strip steel in the pattern plate production mode is compensated. The compensation amount is 10% of the target thickness of the pattern plate, that is: the distance between the air knife and the pattern strip steel = the distance in the conventional production mode + h × 10%, where h is the target thickness of the pattern plate;

[0091] (5) Adjustment of air knife pressure: 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 becomes larger, and the air knife pressure needs to be increased. The zinc layer thickness gauge and the air knife closed-loop control are used to adjust the pressure to control the zinc layer to meet the order requirements.

[0092] 9. Tension leveling: The tension leveling machine is put into use with an elongation of 0.4% to correct the shape of the rolled plate. The staggered degree of the bending roll and the straightening roll is set to 30mm and 33mm.

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

[0094] 11. Shearing: The cold-rolled patterned plate export calculation slitting length correction, taking into account the influence of bean height on the strip length calculation, may cause inaccurate slitting. 10% of the patterned strip thickness will be included as the bean height in the calculation as an influencing factor to make the strip length calculation accurate and prevent slitting errors.

[0095] 12. Production capacity: The production of patterned plates is carried out through continuous pickling, rolling and galvanizing processes of the unit. It mainly produces thin-gauge patterned plates with a thickness of ≤1.5mm and a production speed of 150m / min.

[0096] The continuous pickling and galvanizing unit is used to directly roll the checkered plate and then galvanize it, realizing the cold continuous pickling and rolling galvanizing of ≤1.5mm hot-rolled coils, breaking the specification limit of galvanized checkered plates and filling the market gap. The annual output of ≤1.5mm cold-rolled checkered plates is 60,000 tons, and the plate shape and surface quality meet the standard requirements. According to the benefit calculation of 500 yuan / t, the annual benefit can be 60,000 tons*500 yuan / t=30 million yuan.

[0097] Embodiment 3:

[0098] A method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate comprises the following steps:

[0099] 1. Raw materials: The raw materials of the steel billets are ESP rolled high temperature boron or ferrite rolled products, the raw material thickness accuracy is ±0.04mm, the yield strength is 260MPa, the section high point is 10μm, and the raw material thickness is 1.09 times the target thickness of the patterned plate.

[0100] 2. Welding: Laser welding machine is used for welding. After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the laser welding machine through the clamping roller for head and tail welding, so as to achieve the purpose of continuous production, with fast welding speed and good weld quality.

[0101] 3. Scale breaking: The strip steel enters the scale breaking machine through the entrance loop. The scale breaking machine adopts a one-bending and one-straightening mode. The staggered degree of the bending rollers is 55mm, the staggered degree of the straightening rollers is 50mm, and the elongation of the scale breaking machine is 0.6%.

[0102] 4. Pickling: Pickling adopts 3-stage continuous hydrochloric acid shallow tank pickling. The residual acid on the surface of the strip is squeezed out by a squeeze roller between each pickling tank. The acid temperature is 80℃, the concentration of the 1# pickling tank is 90g / L, the concentration of the 2# pickling tank is 140g / L, and the concentration of the 3# pickling tank is 180g / L. The pickling tanks at each level are connected in series and replenished with automatic acid concentration control. The waste acid is discharged by detecting the conductivity of the 1# pickling tank. The conductivity concentration control range is 280ms / cm.

[0103] 5. Rinsing: 6-stage rinsing is adopted. The upper and lower surfaces of the strip in the rinsing tank are sprayed with desalted water by high-pressure rinsing spray beams to clean the acid on the surface of the strip. The residual rinsing water on the surface of the strip is squeezed out by a squeeze roller between each level of rinsing tank; the rinsing water temperature is controlled at 55°C, the final rinsing tank is heated by steam, and the conductivity of the final rinsing tank is controlled to be ≤100us / cm. Rinsing water is added from time to time for dilution, and the water replenishment is based on 10m 3 / h, the last stage rinsing tank automatically flows to the previous stage according to the liquid level, each level of rinsing tank automatically flows to the previous stage, and the first stage rinsing tank automatically discharges waste.

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

[0105] (1) Rolling mode: The patterned strip is rolled using a flat-pass mill, the rolling mode uses a wet flat-pass mode, the rolling force is 10000KN, the tension is 100KN, the bending roll is 300KN, and the rolling bean height ratio is 10%;

[0106] (2) Leveling fluid parameters: The leveling fluid uses lubricating leveling fluid, the leveling fluid concentration is 4%, and the rolling force is reduced by 3000KN;

[0107] (3) Roller design: The roller crown is +0.05mm, the support roller crown is +0.1mm, the support roller chamfer angle is 15°, and the chamfer position center line is ±600mm. The roller is made of Cr5 high-carbon high-chromium alloy with a hardness of 95HRB. The single rolling stroke reaches 100km.

[0108] (4) Pattern bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm, rolling to the kilometer number, the pattern roller is ground off the line, and rolling continues until the pattern bean width ≤5.5mm, the roller is off the line and the bean is re-engraved, and the rolling mileage of a single engraved roller is 400km.

[0109] 7. Water washing: The water washing adopts the method of high-pressure spraying desalted water on the surface of the line. The surface outlet pressure of the high-pressure pump is ≥5Bar. The iron powder on the surface of the patterned strip steel during the rolling process is cleaned. There are 2 pairs of squeeze rollers and compressed air blowing devices at the water washing outlet to remove residual moisture on the surface.

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

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

[0112] (2) Zinc pot temperature control: For patterned strip, the zinc pot temperature is controlled at 490°C, and the zinc pot temperature is controlled at 470°C;

[0113] (3) Aluminum content control: Iron atoms on the surface of the patterned strip enter the zinc pot, forming Fe2Al5 slag, 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 pattern plate bean height, the distance between the air knife and the pattern strip steel has changed. In order to ensure full specification coverage, the distance between the air knife and the pattern strip steel in the pattern plate production mode is compensated. The compensation amount is 10% of the target thickness of the pattern plate, that is: the distance between the air knife and the pattern strip steel = the distance in the conventional production mode + h × 10%, where h is the target thickness of the pattern plate;

[0115] (5) Adjustment of air knife pressure: 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 becomes larger, and the air knife pressure needs to be increased. The zinc layer thickness gauge and the air knife closed-loop control are used to adjust the pressure to control the zinc layer to meet the order requirements.

[0116] 9. Tension leveling: The tension leveling machine is put into use with an elongation of 0.4% to correct the shape of the rolled plate. The staggered degree of the bending roll and the straightening roll is set to 35mm and 35mm.

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

[0118] 11. Shearing: The cold-rolled patterned plate export calculation slitting length correction, taking into account the influence of bean height on the strip length calculation, may cause inaccurate slitting. 10% of the patterned strip thickness will be included as the bean height in the calculation as an influencing factor to make the strip length calculation accurate and prevent slitting errors.

[0119] 12. Production capacity: The production of patterned plates is carried out through continuous pickling, rolling and galvanizing processes of the unit. It mainly produces thin-gauge patterned plates with a thickness of ≤1.5mm and a production speed of 200m / min.

[0120] The continuous pickling and galvanizing unit is used to directly roll the checkered plate and then galvanize it, realizing the cold continuous pickling and rolling galvanizing of ≤1.5mm hot-rolled coils, breaking the specification limit of galvanized checkered plates and filling the market gap. The annual output of ≤1.5mm cold-rolled checkered plates is 70,000 tons, and the plate shape and surface quality meet the standard requirements. According to the benefit calculation of 500 yuan / t, the annual benefit can be 70,000 tons*500 yuan / t=35 million yuan.

[0121] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0122] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate, characterized in that: The following steps are involved: S1. Select the raw material of rolled steel billet for welding, descaling, pickling and rinsing to produce strip steel; S2, rolling: the strip steel is rolled to produce patterned strip steel through the setting of leveling liquid parameters, roller design and pattern bean design; S3, water washing: washing away the iron powder on the surface of the patterned strip steel during the rolling process; S4, galvanizing: The patterned strip steel is galvanized by the zinc pot process to control the thickness of the zinc layer; S5, tensioning and straightening: the tensioning and straightening machine corrects the shape of the rolled patterned strip steel; S6, passivation: the roller coating passivation machine applies the passivation film on the surface of the roller-pressed galvanized patterned steel strip; S7, Shearing: Cutting patterned strip steel to produce patterned plates.

2. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The steel billet raw material in step S1 is ESP rolled high temperature boron or ferrite rolled product, the raw material thickness accuracy is ±0.04mm, the yield strength is ≤260MPa, the cross section high point is ≤10μm, and the raw material thickness is 1.09 times the target thickness of the patterned plate.

3. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The welding in step S1 is carried out by a laser welder. After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the laser welder through the pinch rollers for head and tail welding. The strip steel enters the descaling machine through the entrance loop. The descaling machine adopts a one-bending and one-straightening mode. The staggered degree of the bending rollers is 40-55mm, the staggered degree of the straightening rollers is 40-50mm, and the elongation of the descaling machine is 0.4-0.6%.

4. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The pickling in step S1 adopts 3-stage continuous hydrochloric acid shallow tank pickling, and the residual acid on the surface of the strip is squeezed out by a squeeze roller between each pickling tank, the acid temperature is 75-80°C, the concentration of the 1# pickling tank is 70-90g / L, the concentration of the 2# pickling tank is 120-140g / L, and the concentration of the 3# pickling tank is 160-180g / L. The pickling tanks at each level are automatically controlled by continuous replenishment, and the waste acid is discharged by detecting the conductivity of the 1# pickling tank, and the conductivity concentration control range is 220-280ms / cm; The rinsing adopts 6-stage rinsing. The upper and lower surfaces of the strip in the rinsing tank are sprayed with desalted water by high-pressure rinsing spray beams to clean the acid on the surface of the strip. The residual rinsing water on the surface of the strip is squeezed out by a squeeze roller between each level of rinsing tank; the rinsing water temperature is controlled at 45-55℃, the final rinsing tank is heated by steam, and the conductivity of the final rinsing tank is controlled to be ≤100us / cm. Rinsing water is added from time to time for dilution, and the water replenishment is based on 8-10m 3 / h, the last stage rinsing tank automatically flows to the previous stage according to the liquid level, each level of rinsing tank automatically flows to the previous stage, and the first stage rinsing tank automatically discharges waste.

5. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The specific operation steps of rolling in step S2 are as follows: S21. Rolling mode: The patterned strip is rolled by a flattening mill, the rolling mode adopts a wet flattening mode, the rolling force is 6000-10000KN, the tension is 80-100KN, the bending roll is 100-300KN, and the rolling bean height ratio is 6%-10%; S22, leveling fluid parameters: the leveling fluid uses lubricating leveling fluid, the leveling fluid concentration is 1-4%, and the rolling force is reduced by 2000-3000KN; S23, Roller design: Roller crown +0.02-0.05mm, support roller crown +0.05-0.1mm, support roller chamfer angle 8-15°, chamfer position center line ±600mm, roll is made of Cr5 high carbon high chromium alloy, hardness 92-95HRB, single rolling stroke reaches 80-100Km; S24, pattern bean design: bean width 7.84mm, bean length 38mm, bean depth 2.7mm, rolling to the kilometer number, pattern roller offline grinding, continue rolling, until the pattern bean width ≤5.5mm, roller offline re-engraving beans, a single roller engraving rolling mileage of 300-400Km.

6. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The water washing in step S3 adopts the method of high-pressure spraying desalting water on the surface of the line, and the surface outlet pressure of the high-pressure pump is ≥5Bar to clean the iron powder on the surface of the patterned strip steel during the rolling process. There are 2 pairs of squeeze rollers and compressed air blowing devices at the water washing outlet to remove residual moisture on the surface.

7. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The specific operation steps of galvanizing in step S4 are as follows: S31, Heating: The heating furnace adopts a vertical electric induction heating furnace, and the direction of the patterned strip is changed by the furnace top roller. The furnace top temperature is controlled at 510-530℃. The heating furnace contains H2 protective gas to reduce the oxide on the surface of the patterned strip; S32. Zinc pot temperature control: For patterned strip, the zinc pot temperature is controlled at 470±20℃, and the zinc pot temperature is controlled at 465±5℃; S33, aluminum content control: iron atoms on the surface of the patterned strip enter the zinc pot, forming Fe2Al5 slag, which floats to the surface of the zinc pot, with an Al content of 0.22-0.25%; S34. Calculation of air knife distance: Due to the protruding height 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: the distance between the air knife and the patterned strip steel = the distance in the conventional production mode + h × 10%, where h is the target thickness of the patterned plate; S35. Adjustment of air knife pressure: The height ratio of patterned plate is 10%. Compared with flat galvanized products, the distance between the air knife and the strip steel should be larger. In order to control the zinc layer to meet the target requirements, the distance between the air knife and the patterned strip steel becomes larger, and the air knife pressure needs to be increased. The zinc layer thickness gauge and the air knife closed-loop control are used to adjust the pressure to control the zinc layer to meet the target requirements.

8. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The tension leveler in step S5 is put into use with an elongation of 0.4% to correct the rolled plate shape, and the staggered degrees of the bending rolls and the straightening rolls are set to 20-35 mm and 30-35 mm.

9. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The coating roller of the roller coating passivation machine in step S6 is 1:1 with the speed of the unit, the pressure of the coating roller of the galvanized patterned plate is 100-130kg, and the temperature of the drying machine is controlled at 180-220℃.

10. The method for producing a continuous hot-base pickled cold-rolled galvanized checkered plate according to claim 1, characterized in that: The shearing in step S7 is a correction for calculating the slitting length at the outlet of the cold-rolled patterned plate, and 10% of the thickness of the patterned strip is included as an influencing factor in the calculation; The production of patterned plates is carried out through continuous pickling, rolling and galvanizing processes of the unit. It mainly produces thin-gauge patterned plates with a thickness of ≤1.5mm and a production speed of 100m-200m / min.

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