A process for producing a pattern plate for a continuous wet-type skin-pass line

Abstract

The present application relates to the technical field of ESP hot-rolled coil in cold state using continuous wet smooth line to produce patterned plate, and particularly discloses a process method for producing patterned plate by using continuous wet smooth line, and an ESP hot-rolled patterned coil: the ESP production line produces patterned coil through three rough rolling mills, an induction heating furnace, high-pressure descaling, five finishing mills, a laminar cooling section and a coiler; the continuous wet smooth line produces patterned plate: the patterned coil is subjected to smooth rolling to produce patterned plate; the ESP hot-rolled patterned coil process is rolled into patterned plate with a thickness of less than or equal to 1.0 mm through an uncoiler, a straightening machine, a slitting shear, a laser welding machine, a 1# stretch leveler, a wet smooth rolling mill, a dryer, a 2# stretch leveler, a flying shear and a coiler; the present application uses the continuous wet smooth line to roll patterned plate by using the ESP hot-rolled coil, realizes cold continuous rolling of 1.0 mm patterned plate, breaks through the lower limit of the hot-rolled patterned plate specification, fills the market gap and improves the product competitiveness.

Description

Technical Field

[0001] This invention relates to the technical field of producing patterned plates from ESP hot-rolled coils in a cold state using a continuous wet leveling line, specifically to a process method for producing patterned plates using a continuous wet leveling line. Background Technology

[0002] The ESP hot-rolled coil technology was developed based on Demark's ISP technology. Its production line uses a parallel-plate straight-arc crystallizer in the continuous casting machine. The billet is guided by a casting-rolling structure, and after being pressed down by a liquid core, the billet directly enters the primary rolling mill to be rolled into medium-thick plates. After shearing, the plates are ready for sale. The remaining billets are induction heated and then rolled into thin strip steel in a five-stand finishing mill. After cooling, they are coiled into coils. The ESP production line has a compact layout, does not use long heating furnaces or Cremona furnaces, and is only 190m long.

[0003] Key technical features of the ESP hot-rolled coil process:

[0004] 1. Higher casting speed. Higher casting speeds can be achieved through unconventional techniques such as optimizing casting machine configuration and increasing the flexibility of thickness and casting speed variations. Mathematical simulations based on computer-optimized fluid dynamics calculations and (physical) water model tests show that the current casting speed of 5-6 m / min can still be significantly increased.

[0005] 2. Stable process control during the casting period. Significant improvements have been made in the stable control of billet forming and slab solidification, and the protective slag required for different steel grades has been optimized. By controlling friction and the angle arrangement of the crystallizer, stable control at high casting speeds has now been achieved.

[0006] 3. Extensive application of automation technology. Improvements in technical process control, sensor technology, data management, and processes are key to success. In thickness control, temperature control, strip shape control, and flatness control, the central network enhances the flexibility and standardization of the process model. For example, the "microstructure target cooling" package can control the metallurgical parameters of the strip steel. On the ESP line, automation permeates the entire process from casting to cooling.

[0007] Patterned steel sheets are favored by the market for their unique textures and diverse applications. In practical applications, they offer functional advantages such as anti-slip and wear resistance. With the development of market demand, customers are increasingly demanding 1.0mm thin patterned steel sheets. ESP hot rolling can only continuously and stably roll 1.4mm patterned steel sheets and 1.0mm smooth hot-rolled coils. It is difficult to achieve batch and stable production of 1.0mm hot-rolled patterned steel sheets, and there is still a gap in the market for 1.0mm patterned steel sheets. In order to capture the market and improve the company's efficiency, there is an urgent need for a wet leveling line process technology that can continuously and stably produce 1.0mm patterned steel sheets to solve the problem of the existing gap in 1.0mm patterned steel sheet production. Summary of the Invention

[0008] To address the problems existing in the prior art, the purpose of this invention is to provide a process method for producing patterned plates using a continuous wet leveling line.

[0009] The technical solution adopted by this invention to solve its technical problem is: a process method for producing patterned plates in a continuous wet leveling line, comprising the following steps:

[0010] S1, ESP hot-rolled patterned coil: The ESP production line produces patterned coils through three roughing mills, induction heating furnace, high-pressure descaling, five finishing mills, laminar flow cooling section and coiler.

[0011] S2. Continuous wet leveling line for producing patterned plates: Patterned coils are leveled and rolled to produce patterned plates.

[0012] S3 and ESP hot-rolled patterned coils are produced by rolling through an uncoiler, straightener, slitting shear, laser welding machine, #1 tension leveler, wet leveler, dryer, #2 tension leveler, flying shear, and coiler into thin-gauge patterned sheets with a thickness of ≤1.0mm.

[0013] Preferably, the ESP hot-rolled patterned coil in step S1 uses low-temperature ferritic rolling raw material with a yield strength ≤290MPa and a local high point of ≤10μm in the cross section. The ESP production line heats the coil in a converter and casts it in a continuous casting machine before it enters the three roughing mills.

[0014] Preferably, the five-stage finishing mill in step S1 controls the rolling of the strip surface pattern.

[0015] Preferably, the specific steps for producing patterned plates using the continuous wet leveling line in step S2 are as follows:

[0016] After double uncoiling, S21 and ESP hot-rolled patterned coils are straightened at the head and tail and then fed into a laser welding machine via a shared pinch roller for head and tail welding. The strip steel is buffered through the inlet looper to achieve continuous production of steel coils.

[0017] S22. The strip steel is straightened and stretched by the No. 1 tension leveler to improve the plate shape, and then rolled into patterned plate by the wet leveler.

[0018] S23. After exiting the leveling machine, the water stains on the surface of the strip are blown away by the compressed air blowing beam and then the strip enters the dryer for drying.

[0019] S24. After drying, the strip enters the No. 2 straightening machine to further improve the strip shape after rolling. It is then buffered by the exit looper before being slit and coiled.

[0020] Preferably, the elongation of the No. 1 tension leveler is 0.4±0.1%, the bending roller box stagger is 40±5mm, and the straightening roller box stagger is 30±5mm; the elongation of the No. 2 tension leveler is 0.2±0.1%, the bending roller box stagger is 30±5mm, and the straightening roller box stagger is 20±5mm.

[0021] Preferably, the leveling machine is a four-roll wet leveling machine with a production speed of 60-200 m / min. The leveling machine uses a mixture of leveling solution and demineralized water to prepare a mixed solution with a conductivity of 1200±300 μm / cm. The concentration of the original leveling solution is 4%±1%, the conductivity of the demineralized water is <20 μm / cm, and the spray flow rate of the mixed solution is 1.0±0.2 m. 3 / h, the leveling machine adopts rolling force mode, and the front and rear tension control range is 70KN-110KN.

[0022] Preferably, the working roller design of the leveling machine is as follows: the support roller is made of Cr3, the working roller is made of cast iron, the upper working roller has a bean width of 5.5mm / bean length of 28mm / bean depth of 1.8mm, and the lower working roller is a smooth roller.

[0023] Preferably, the leveling mill rolls are designed with the following characteristics: the working rolls have a roll crown of +0.07-0.10mm, and the support rolls have a crown of +0.05-0.08mm.

[0024] Preferably, the ESP hot-rolled patterned coil is a patterned plate product with a rolling height of 6%-12%.

[0025] The present invention has the following beneficial effects:

[0026] The present invention discloses a process method for producing patterned plates using a continuous wet leveling line. This method utilizes ESP hot-rolled coils to roll patterned plates, achieving continuous cold rolling of 1.0mm patterned plates. This breaks through the lower limit of hot-rolled patterned plate specifications, fills a market gap, and enhances product competitiveness.

[0027] The process method for producing patterned plates using a continuous wet leveling line designed in this invention achieves a monthly output of 0.3 million tons of patterned plates with a specification of ≤1.0mm, and the plate shape, bead height ratio, and surface quality of the patterned plates meet the standard requirements. Attached Figure Description

[0028] Figure 1 This is a production process flow chart for ESP hot-rolled patterned coils.

[0029] Figure 2 This is a production process flow chart for patterned steel plates produced on a continuous wet leveling line.

[0030] Figure 3 This is a table showing the operating data of Example 1 of the process method for producing patterned plates using a continuous wet leveling line. Detailed Implementation

[0031] 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.

[0032] like Figures 1-2 As shown, a process for producing patterned steel plates using a continuous wet leveling line includes the following steps:

[0033] 1. ESP Hot-Rolled Patterned Coil: ESP hot-rolled patterned coil is made from low-temperature ferritic rolled raw material with a yield strength ≤290MPa and a local high point of ≤10μm in the cross section.

[0034] like Figure 1 As shown, the ESP production line involves converter heating and continuous casting before entering the three roughing mills. The ESP production line then produces patterned coils via three roughing mills, an induction heating furnace, high-pressure descaling, a five-stage finishing mill, a laminar flow cooling section, and a coiler. Patterned strip rolling is primarily achieved using pattern rolls on the finishing F5 mill, enabling batch and stable rolling of hot-rolled patterned coils ≥1.2mm. However, 1.0mm hot-rolled patterned coils cannot be continuously and stably produced due to issues such as pattern roll breakage and high rolling load.

[0035] 2. Continuous wet leveling line for producing patterned plates: Patterned coils are leveled and rolled to produce patterned plates; a continuous wet leveling line is used to level and roll ESP hot-rolled coils to produce patterned plates. By selecting a certain type of leveling fluid and adjusting the process parameters, the rolling load of the leveling machine is reduced, the wear of the leveling machine work rolls is reduced, and the production line speed is increased, thereby achieving the purpose of increasing production and reducing speed.

[0036] 3. For example Figure 2 As shown, the ESP hot-rolled patterned coil process involves uncoiling, straightening, slitting, laser welding, No. 1 tension leveling machine, wet leveling machine, dryer, No. 2 tension leveling machine, flying shear, and coiler to produce thin-gauge patterned sheets with a thickness of ≤1.0mm.

[0037] The specific steps for producing patterned steel sheets using a continuous wet leveling line are as follows:

[0038] (1) After double uncoiling, the ESP hot-rolled patterned coil is straightened at the head and tail and then enters the laser welding machine through a shared pinch roller for head and tail welding. The strip steel is buffered through the inlet looper to achieve the purpose of continuous production of steel coils.

[0039] (2) The strip steel is straightened and stretched by the No. 1 straightening machine to improve the plate shape, and then rolled into patterned plate by the wet leveling machine. The elongation of the No. 1 straightening machine is 0.4±0.1%, the bending roll box crossover is 40±5mm, and the straightening roll box crossover is 30±5mm.

[0040] (3) After exiting the leveling machine, the water stains on the surface of the strip are blown away by the compressed air blowing beam and then the strip enters the dryer for drying.

[0041] (4) After drying, the strip enters the No. 2 straightening machine to further improve the strip shape after rolling. It is buffered by the exit looper, and then slit and rolled. The elongation of the No. 2 straightening machine is 0.2±0.1%, the bending roll box crossover is 30±5mm, and the straightening roll box crossover is 20±5mm.

[0042] (5) The leveling machine is a four-roll wet leveling machine with a production speed of 60-200 m / min. The leveling machine uses a mixture of leveling liquid and demineralized water to prepare a mixed liquid with a conductivity of 1200±300 μm / cm. The original concentration of the leveling liquid is 4%±1%, the conductivity of the demineralized water is <20 μm / cm, and the spray flow rate of the mixed liquid is 1.0±0.2 m. 3 / h, the leveling machine adopts rolling force mode, and the front and rear tension control range is 70KN / 110KN.

[0043] The working roller design of the leveling machine: the support roller is made of Cr3, the working roller is made of cast iron, the upper working roller has a bean width of 5.5mm / bean length of 28mm / bean depth of 1.8mm, and the lower working roller is a smooth roller.

[0044] Leveling mill roll design: The working roll has a roll crown of +0.07-0.10mm, and the support roll has a crown of +0.05-0.08mm.

[0045] (6) ESP hot-rolled patterned coils are rolled into patterned plate products with a high bead ratio of 6%-12%, and the plate shape and performance of the patterned plate can meet the standards.

[0046] Example 1:

[0047] like Figure 3As shown, taking the actual production operation data of patterned steel plate in early September 2024 as an example, the ESP hot-rolled patterned steel plate material is Q235B, with specifications of 1.05*1250mm; the upper roll width of the leveling mill work roll is 5.5mm / roll length is 28mm / roll depth is 1.8mm, the conductivity of the leveling solution mixture is 1300μm / cm (original solution concentration is about 3.5%), and the spray flow rate of the mixture is 1.08m³ / cm². 3 / h, leveling mill rolling force 6500±500KN, leveling mill front and rear tension setting 90KN / 105KN, leveling mill rolling speed 80-100m / min; No.1 tension leveler elongation 0.4%, No.2 tension leveler 0.2%, dryer drying temperature ≥90℃, patterned plate shape is good, bean height ratio 8.4%-9.6% meets the requirements.

[0048] By using a continuous wet leveling line to roll ESP hot-rolled coils into patterned plates, a preliminary monthly production capacity of 3,000 tons of patterned plates with a specification of ≤1.0mm has been achieved. The plate shape, bead height ratio, and surface quality of the patterned plates meet the standard requirements. Based on a profit calculation of 400 yuan / ton, the annual profit can be: 3,000 tons * 12 months * 400 yuan / ton = 14.4 million yuan.

[0049] 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.

[0050] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A process for producing patterned steel plates using a continuous wet leveling line, characterized in that, Includes the following steps: S1, ESP hot-rolled patterned coil: The ESP production line produces patterned coils through three roughing mills, induction heating furnace, high-pressure descaling, five finishing mills, laminar flow cooling section and coiler. S2. Continuous wet leveling line for producing patterned plates: Patterned coils are rolled into thin-gauge patterned plates with a thickness of ≤1.0mm by an uncoiler, straightener, slitting shear, laser welding machine, No. 1 tension leveler, wet leveler, dryer, No. 2 tension leveler, flying shear, and coiler. The specific steps for producing patterned steel sheets using a continuous wet leveling line are as follows: After double uncoiling, S21 and ESP hot-rolled patterned coils are straightened at the head and tail and then fed into a laser welding machine via a shared pinch roller for head and tail welding. The strip steel is buffered through the inlet looper to achieve continuous production of steel coils. S22. The strip steel is straightened and stretched using a No. 1 tension leveler to improve its shape. The No. 1 tension leveler has an elongation of 0.4±0.1%, a bending roll box misalignment of 40±5mm, and a straightening roll box misalignment of 30±5mm. It then undergoes patterned plate rolling using a wet leveling mill. The wet leveling mill is a four-roll wet leveling mill with a production speed of 60-200m / min. The wet leveling mill uses a mixture of leveling solution and demineralized water to prepare a solution with a conductivity of 1200±300μm / cm. The original concentration of the leveling solution is 4%±1%, and the conductivity of the demineralized water is <20μm / cm. The spray flow rate of the mixed solution is 1.0±0.2m. 3 / h, the wet leveling machine adopts the rolling force mode, and the front and rear tension control range is 70KN-110KN; S23. After exiting the wet leveling machine, the water stains on the surface of the strip are blown away by the compressed air blowing beam and then the strip enters the dryer for drying. S24. After drying, the strip enters the No. 2 straightening machine to further improve the strip shape after rolling. The No. 2 straightening machine has an elongation of 0.2±0.1%, a bending roll box misalignment of 30±5mm, and a straightening roll box misalignment of 20±5mm. After being buffered by the exit looper, it is then slit and coiled.

2. The process method for producing patterned plates using a continuous wet leveling line according to claim 1, characterized in that, The ESP hot-rolled patterned coil in step S1 uses low-temperature ferritic rolling raw material with a yield strength ≤290MPa and a local high point of ≤10μm in the cross section. The ESP production line heats the coil in a converter and casts it in a continuous casting machine before it enters the three roughing mills.

3. The process method for producing patterned plates on a continuous wet leveling line according to claim 1, characterized in that, In step S1, the five-stage finishing mill controls the rolling of the strip surface pattern.

4. The process method for producing patterned plates on a continuous wet leveling line according to claim 1, characterized in that, The roll design of the wet leveling machine is as follows: the support roll is made of Cr3, the working roll is made of cast iron, the upper working roll has a roll mark width of 5.5mm, a roll length of 28mm, and a roll depth of 1.8mm, and the lower working roll is a smooth roll.

5. The process method for producing patterned plates on a continuous wet leveling line according to claim 1, characterized in that, The wet leveling machine roll design: the working roll has a roll crown of +0.07-0.10mm, and the support roll has a crown of +0.05-0.08mm.

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