Production process method of continuous pickling cold-rolled checkered plate
Through the production process method of continuous pickling and cold-rolled patterned plates, the problem of mass production of hot-rolled patterned plates in the prior art is solved, and efficient and low-cost ultra-thin patterned plates are achieved to meet the needs of industrial mass production.
Patent Information
- Application Number
- CN202510212902.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2025-04-22
AI Technical Summary
The prior art is difficult to achieve mass production of hot-rolled patterned plates with ≤1.0mm, and the production process of cold-rolled patterned plates is complex and has high cost, making it difficult to meet the needs of industrial mass production.
The production process method of continuous pickling-washed cold-rolled patterned plates is adopted, including steelmaking continuous casting, strip rolling and cold-rolled rolling pattern. By optimizing the parameters and production processes of cold rolling equipment, the hot-rolled flat coils are continuously and stably rolled into patterned plates in a cold state.
Mass production of ≤1.0mm patterned plates is achieved, with simple production process, improving the production efficiency of ultra-thin specification patterned plates, reducing production costs, and ensuring product qualification rate and surface quality.
Smart Images
Figure HDA0005286506420000011
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of steel rolling, in particular to a production process for a continuous pickling cold-rolled patterned plate. Background Art
[0002] At present, the market demand for thin-gauge and thin-checkered plates is getting higher and higher, and hot-rolled checkered plate products are getting thinner and thinner. With the development of steel rolling technology, conventional hot rolling can roll 1.4mm checkered plates.
[0003] In order to further reduce the thickness of the patterned plate, ESP technology has emerged. The production plan of ESP hot-rolled patterned coil generally includes steelmaking → continuous casting → rough rolling → finishing rolling (patterned roller) → layer cooling → coiling. ESP hot-rolled patterned coil is a process of rolling with patterned rollers on the last rolling mill of finishing rolling. Generally, five continuous rolling is used to roll the strip steel. The total reduction of the stand reaches 80%-90%, which can achieve rolling of 1.0mm hot-rolled patterned coils. However, due to the limitation of the patterned roller rolling range, the output is greatly limited. This technology is difficult to achieve batch production of 1.0mm hot-rolled patterned plates, and patterned plates <1.0mm are still in the blank of the market. In addition, the pickled patterned plates used in the market are mainly used after pickling of hot-rolled patterned plates. Not only is the market of ≤1.0mm blank, but the pickled patterned plates using hot-rolled raw materials are inefficient and costly, and it is difficult to meet the needs of industrial mass production.
[0004] The cold-rolled patterned plate production process also has disadvantages when producing patterned plates with a thickness of ≤1.0mm. The cold-rolled patterned plate mainly uses annealed cold-rolled base material to roll the patterned plate. The main production process is cold-rolled base material → pickling → cold continuous rolling (rolling thin strip steel) → annealing → stripping → rolling pattern → coiling. The cold-rolled patterned plate production process must first roll thin strip steel and then anneal and other processes before pattern rolling. The production process is more complicated than hot rolling, and the production cost is higher. It is also difficult to meet the needs of industrial mass production of patterned plates with a thickness of ≤1.0mm. Summary of the invention
[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a production process method for a continuous pickling cold-rolled patterned plate. The method can improve the production efficiency of ultra-thin patterned plates, the product production process is simple, and the production cost is reduced while ensuring the product qualification rate, and the batch production of patterned plates ≤1.0mm can be realized.
[0006] In order to achieve the above object, the present invention discloses a production process of a continuous pickling cold-rolled patterned plate, comprising the following steps:
[0007] S1, pouring the molten steel obtained by continuous casting and base material steelmaking into a crystallizer for drawing to obtain a steel billet;
[0008] S2, strip steel rolling, steel billet rolling to obtain strip steel;
[0009] S3, cold rolling pattern, the obtained strip steel is pickled, and then the pattern is rolled on the strip steel by cold rolling, and then the rolled pattern plate is coiled by a coiler to obtain a patterned plate.
[0010] Preferably, in step S1, the raw materials of the base material include the following components in percentage by mass: C: ≤0.05%, Si: 0.038% to 0.055%, Mn: 0.06% to 0.2%, P≤0.025%, S≤0.006%, and the remainder is Fe and impurities.
[0011] Preferably, in step S1, the base material is made of high temperature B-added or ferrite rolled raw material.
[0012] Preferably, step S2 includes rough rolling, finishing rolling and coiling processes; wherein, the rough rolling and finishing rolling temperatures are controlled at 1040-1100°C, and the target thickness of the rough rolling slab is 8-18mm; the finishing rolling adopts 5-stand rolling, and F1-F5 are all smooth rollers; the reduction rates of F1-F5 are 50-60%, 30-40%, 30-40%, 20-30%, and 18-25%, respectively; the finishing rolling start temperature is controlled at 980-1060°C as a whole, and the finishing rolling temperature is 850-895°C; the coiling temperature of laminar cooling coiling is 630-670°C.
[0013] Preferably, the thickness of the steel strip obtained in step S2 is 1.05 to 1.09 times the target thickness of the patterned plate.
[0014] Preferably, step S3 comprises the following steps:
[0015] 1) After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the welding machine through the pinch roller for head and tail welding to achieve the purpose of continuous production;
[0016] 2) After the strip passes through the entrance looper and descaling machine, it enters the pickling tank to remove the surface oxide scale, and is rinsed in the rinsing tank to remove the residual chloride ions on the surface;
[0017] 3) After rinsing, the strip is dried and enters the rolling mill for patterned plate rolling;
[0018] 4) After rolling, it enters the straightening machine to further improve the shape of the strip after rolling, passes through the outlet loop, and then is oiled and coiled to obtain the patterned plate.
[0019] Preferably, in step 2), the elongation of the phosphorus breaking machine is 0.4% to 0.5%, the bending stagger is 40-50 mm, and the straightening stagger is 40 to 50 mm.
[0020] Preferably, in step 2), the pickling speed is 100-200 m / min, shallow turbulent 5-stage pickling is adopted, the acid temperature is 70-85°C, the acid concentration of the 1# acid tank is 30-80 g / L, the acid concentration of the 2# acid tank is 70-100 g / L, the acid concentration of the 3# acid tank is 90-120 g / L, the acid concentration of the 4# acid tank is 100-140 g / L, and the acid concentration of the 5# acid tank is 150-180 g / L.
[0021] Preferably, in step 2), 6-stage rinsing is used, and the conductivity of rinsing water in the final rinsing tank is 50-120 μ / cm.
[0022] Preferably, in step 3), the rolling process parameters are as follows: the flattening machine adopts wet flattening mode, the flattening liquid increases lubricant, reduces rolling force, concentration is 2-5%, rolling force is 5000-9000 KN, tension is 70-120 KN, bending roll is 100-300 KN, and a rolling bean height ratio of 6% to 15% can be achieved.
[0023] Preferably, the pattern beans used in step 3) are designed as follows: bean width 7.84mm, bean length 38mm, bean depth 2.5mm; after rolling to the kilometer number, the pattern roller is ground offline, and rolling is continued until the pattern bean width is ≤5.5mm, and the roller is re-engraved offline, and a single bean engraving can achieve a rolling mileage of 500km.
[0024] Preferably, the rolling rollers used in step 3) are cast iron rolling rollers, with a roller convexity of +0.07 to 0.15 mm and a support roller convexity of +0.05 to 0.1 mm.
[0025] Preferably, in step 4), the tension leveler is put into use with an elongation of 0.4% to correct the shape of the rolled plate, and the staggered degrees of the bending rolls and the straightening rolls are set to 20-35 mm and 30-35 mm.
[0026] Preferably, the obtained patterned plate has a thickness of 0.7 to 1 mm and a yield strength of 350 to 380 MPa.
[0027] Preferably, the width of the obtained patterned plate is 1250 mm or 1500 mm, the bean height ratio is 8% to 10%, the bean width is 5.5 to 7.84 mm, and the bean length is 26 to 38 mm.
[0028] Compared with the prior art, the advantages and positive effects of the present invention are: providing a production process method for continuous pickling cold-rolled checkered plates. Based on the hot-rolled flat coil, the method optimizes the cold rolling equipment parameters and production process to realize the continuous and stable rolling of the hot-rolled flat coil into a checkered plate in a cold state, and can realize the mass production of checkered plates ≤1.0mm. The production process of the method is simple, and it can improve the production efficiency of ultra-thin checkered plates, ensure the shape and surface quality of the checkered plates, and reduce production costs while ensuring the product qualification rate. It has been verified that the 0.7-1mm cold-rolled checkered plates using this method can achieve an annual output of 50,000 tons, and the shape and surface quality meet the standard requirements. According to the benefit calculation of 500 yuan / t, it can create an annual benefit of 25 million yuan. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0030] Figure 1 It is a schematic diagram of the structure of the production system used for the cold rolling pattern of this embodiment. DETAILED DESCRIPTION
[0031] The present invention is described in detail below by means of exemplary embodiments. However, it should be understood that the structures and features in one embodiment may also be beneficially combined in other embodiments without further description.
[0032] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by terms such as "horizontal", "vertical", "inside", "outside", "up", "down", "left", "right", "front", and "back" are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0033] A production process for a continuously pickled cold-rolled checkered plate comprises the following steps:
[0034] S1. Steelmaking and continuous casting: The molten steel obtained by base material steelmaking is poured into a crystallizer for drawing to obtain a steel billet;
[0035] S2. Strip steel rolling: steel billets are rolled into strip steel;
[0036] S3. Cold-rolled pattern: After the obtained strip steel is pickled, a pattern is rolled on the strip steel by cold rolling, and then the rolled pattern plate is coiled by a coiler to obtain a patterned plate.
[0037] Based on the hot-rolled flat coil, the method optimizes the cold rolling equipment parameters and production process, and rolls the pattern on the hot-rolled strip steel by cold rolling, so as to realize the continuous and stable rolling of the pickled cold-formed coil into the patterned plate in the cold state, and can realize the mass production of the patterned plate of ≤1.0mm. The method has a simple production process, can improve the production efficiency of ultra-thin patterned plates, ensure the shape and surface quality of the patterned plates, and reduce the production cost while ensuring the product qualification rate.
[0038] Compared with ESP hot-rolled checkered plate, the method of this embodiment can break through the specification limit of hot-rolled checkered plate and produce checkered plate of less than 1.0 mm. The steel type can be rolled using high-temperature B-added or ferrite rolling raw materials (such as DC01-E), which can effectively reduce the cost of raw materials (reduced by 30 yuan / t compared with Q235B commonly used to produce ultra-thin checkered plates). The strength of the obtained checkered plate is 60-80Mpa higher than that of the hot-rolled checkered plate.
[0039] Compared with the cold-rolled checkered plate production process, the method of this embodiment can save the cold rolling, annealing and striping steps, with higher production efficiency and lower rolling cost, with a comparative cost reduction of 130 yuan / ton. The strength of the obtained checkered plate is 30-50 MPa higher than that of the cold-rolled checkered plate.
[0040] This method uses pickled cold-formed products to continuously roll patterned plates, and the annual output of 0.7-1mm cold-rolled patterned plates is 50,000 tons, and the plate shape and surface quality meet the standard requirements. Calculated at 500 yuan / t, it can generate 25 million yuan in benefits each year.
[0041] Wherein, in step S1, the base material is made of high temperature B-added or ferrite rolled raw material.
[0042] Specifically, the raw material of the base material in step S1 includes the following components in percentage by mass: C: ≤0.05%, Si: 0.038% to 0.055%, Mn: 0.06% to 0.2%, P≤0.025%, S≤0.006%, and the remainder is Fe and impurities. The raw material of the base material can be continuous casting and rolling general grade cold forming special steel, grade DC01-E.
[0043] Wherein, step S2 includes rough rolling, finish rolling and coiling processes.
[0044] Specifically, in step S2, the rough rolling and final rolling temperature is controlled at 1040-1100°C, and the target thickness of the rough rolling slab is 8-18 mm.
[0045] Specifically, in step S2, the finishing rolling adopts 5-stand rolling, F1~F5 are all smooth rollers; the reduction rates of F1~F5 are 50-60%, 30-40%, 30-40%, 20-30%, and 18-25% respectively; the finishing rolling start temperature is overall controlled at 980℃~1060℃, and the final rolling temperature is 850~895℃.
[0046] Specifically, in step S2, the coiling temperature of the laminar cooling coiling in the coiling process is 630-670°C.
[0047] Specifically, the thickness of the steel strip obtained in step S2 is 1.05 to 1.09 times the target thickness of the patterned plate.
[0048] The local high point of the steel strip obtained in step S2 is ≤6 μm.
[0049] Wherein, step S3 comprises the following steps:
[0050] 1) After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the welding machine through the pinch roller for head and tail welding to achieve the purpose of continuous production;
[0051] 2) After the strip passes through the entrance looper and descaling machine, it enters the pickling tank to remove the surface oxide scale, and is rinsed in the rinsing tank to remove the residual chloride ions on the surface;
[0052] 3) After rinsing, the strip is dried and enters the rolling mill for patterned plate rolling;
[0053] 4) After rolling, it enters the straightening machine to further improve the shape of the strip after rolling, passes through the outlet loop, and then is oiled and coiled to obtain the patterned plate.
[0054] Specifically, the production system used in step S3 is as follows: Figure 1 As shown, it mainly includes uncoiler, straightener, slitting shear, welding machine, inlet looper, pickling tank, rinsing tank, dryer, leveler, tensioning and leveling machine, flying shear, oiler and coiler.
[0055] Specifically, in step 2), the elongation of the phosphorus breaking machine is 0.4% to 0.5%, the bending staggered degree is 40-50mm, and the straightening staggered degree is 40 to 50mm.
[0056] Specifically, in step 2), the pickling speed is 100-200 m / min, shallow turbulent 5-level pickling is adopted, the acid temperature is 70-85°C, the acid concentration of the 1# acid tank is 30-80 g / L, the acid concentration of the 2# acid tank is 70-100 g / L, the acid concentration of the 3# acid tank is 90-120 g / L, the acid concentration of the 4# acid tank is 100-140 g / L, and the acid concentration of the 5# acid tank is 150-180 g / L.
[0057] Specifically, in step 2), rinsing is performed using 6 stages, and the conductivity of rinsing water in the final rinsing tank is 50-120 μ / cm.
[0058] Specifically, in step 3), the rolling process parameters are as follows: the flattening machine adopts wet flattening mode, the flattening liquid increases lubricant, reduces rolling force, concentration is 2-5%, rolling force is 5000-9000 KN, tension is 70-120 KN, bending roll is 100-300 KN, and a rolling bean height ratio of 6% to 15% can be achieved.
[0059] Specifically, the pattern beans used in step 3) are designed as follows: bean width 7.84mm, bean length 38mm, bean depth 2.5mm; after rolling to the kilometer number, the pattern roller is ground offline, and rolling is continued until the pattern bean width is ≤5.5mm, and the roller is re-engraved offline, and a single bean engraving can achieve a rolling mileage of 500km.
[0060] Specifically, the rollers used in step 3) are cast iron rollers.
[0061] Specifically, the roller convexity of the rolling roller used in step 3) is +0.07 to 0.15 mm, and the supporting roller convexity is +0.05 to 0.1 mm.
[0062] Specifically, in step 4), the tension leveler 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.
[0063] The thickness of the patterned plate obtained in step S3 is 0.7-1 mm, and the yield strength is 350-380 MPa.
[0064] The width of the patterned plate obtained in step S3 is 1250 mm or 1500 mm, the bean height ratio is 8%-10%, the bean width is 5.5-7.84 mm, and the bean length is 26-38 mm.
[0065] Example 1
[0066] A production process for a continuously pickled cold-rolled checkered plate comprises the following steps:
[0067] S1. Steelmaking and continuous casting: prepare base material raw materials, including the following components in percentage by weight: C: 0.05%, Si: 0.038%, Mn: 0.06%, P: 0.025%, S: 0.006%, and the balance is Fe and impurities; pour the molten steel obtained by steelmaking the base material into a crystallizer for drawing to obtain a steel billet;
[0068] S2, strip rolling: step S2 includes rough rolling, finishing rolling and coiling processes; wherein, the rough rolling and final rolling temperatures are controlled at 1040°C, and the target thickness of the rough rolling slab is 8mm; the finishing rolling adopts 5-stand rolling, and F1-F5 are all smooth rollers; the reduction rates of F1~F5 are 50%, 30%, 30%, 20%, and 18% respectively; the finishing rolling start temperature is controlled at 980°C as a whole, and the final rolling temperature is 850°C; the coiling temperature of the laminar cooling coiling in the coiling process is 630°C; the strip thickness obtained in step S2 is 1.05~1.09 times the target thickness of the patterned plate.
[0069] S3, cold rolling pattern comprises the following steps:
[0070] 1) After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the welding machine through the pinch roller for head and tail welding to achieve the purpose of continuous production;
[0071] 2) After the strip passes through the entrance looper and the descaling machine, it enters the pickling tank to remove the surface iron oxide scale, and is rinsed in the rinsing tank to remove the residual chloride ions on the surface; wherein, the elongation of the descaling machine is 0.4%, the bending staggered degree is 40mm, and the straightening staggered degree is 40mm; the pickling speed is 100m / min, and the shallow turbulent 5-level pickling is adopted, the acid temperature is 70℃, the acid concentration of the 1# acid tank is 30g / L, the acid concentration of the 2# acid tank is 70g / L, the acid concentration of the 3# acid tank is 90g / L, the acid concentration of the 4# acid tank is 100g / L, and the acid concentration of the 5# acid tank is 150g / L; the rinsing adopts 6-level rinsing, and the conductivity of the rinsing water in the final rinsing tank is 50μ / cm;
[0072] 3) After rinsing, the strip is dried and enters the rolling mill for patterned plate rolling; the rolling process parameters are as follows: the flattening machine adopts the wet flattening mode, the flattening liquid increases the lubricant, reduces the rolling force, the concentration is 2%, the rolling force is 5000KN, the tension is 70KN, the bending roll is 100KN, and the rolling bean height ratio can be 6%; the pattern beans used are designed as follows: bean width 7.84mm, bean length 38mm, bean depth 2.5mm; after rolling to the kilometer number, the pattern roller is ground offline, and rolling continues until the pattern bean width is ≤5.5mm, and the roller is re-engraved offline, and a single bean engraving can achieve a rolling mileage of 500Km;
[0073] 4) After rolling, it enters the straightening machine to further improve the strip shape after rolling. The straightening machine is put into use with an elongation of 0.4% to correct the rolled plate shape. The staggered degree of the bending roll and the straightening roll is set to 20mm and 30mm. After passing through the outlet looper, it is oiled and coiled to obtain the patterned plate.
[0074] After testing, the thickness of the obtained patterned plate is 0.95mm, the yield strength is 375Mpa, the width of the patterned plate is 1500mm, the bean height ratio is 10%, the bean width is 5.5-7.84mm, and the bean length is 26-38mm.
[0075] Example 2
[0076] A production process for a continuously pickled cold-rolled checkered plate comprises the following steps:
[0077] S1. Steelmaking and continuous casting: prepare base material raw materials, including the following components C: 0.03%, Si: 0.055%, Mn: 0.2%, P: 0.015%, S: 0.004%, and the balance is Fe and impurities; pour the molten steel obtained by base material steelmaking into a crystallizer for drawing to obtain a steel billet;
[0078] S2, strip rolling: step S2 includes rough rolling, finishing rolling and coiling processes; wherein, the rough rolling and final rolling temperatures are controlled at 1100°C, and the target thickness of the rough rolling slab is 18mm; the finishing rolling adopts 5-stand rolling, and F1-F5 are all smooth rollers; the reduction rates of F1~F5 are 60%, 40%, 40%, 30% and 25% respectively; the finishing rolling start temperature is controlled at 1060°C as a whole, and the final rolling temperature is 895°C; the coiling temperature of the laminar cooling coiling in the coiling process is 670°C; the strip thickness obtained in step S2 is 1.05~1.09 times the target thickness of the patterned plate.
[0079] S3, cold rolling pattern comprises the following steps:
[0080] 1) After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the welding machine through the pinch roller for head and tail welding to achieve the purpose of continuous production;
[0081] 2) After the strip passes through the entrance looper and the descaling machine, it enters the pickling tank to remove the surface iron oxide scale, and is rinsed in the rinsing tank to remove the residual chloride ions on the surface; among them, the elongation of the descaling machine is 0.5%, the bending staggered degree is 40mm, and the straightening staggered degree is 40mm; the pickling speed is 100m / min, and the shallow turbulent 5-level pickling is adopted, the acid temperature is 70℃, the acid concentration of the 1# acid tank is 30g / L, the acid concentration of the 2# acid tank is 70g / L, the acid concentration of the 3# acid tank is 90g / L, the acid concentration of the 4# acid tank is 100g / L, and the acid concentration of the 5# acid tank is 150g / L; 6-stage rinsing is adopted, and the conductivity of the rinsing water in the final rinsing tank is 50μ / cm; the bending stagger is 50mm, the straightening stagger is 50mm, the pickling speed is 200m / min, and the shallow turbulent 5-stage pickling is adopted, the acid temperature is 85℃, the acid concentration of the 1# acid tank is 80g / L, the acid concentration of the 2# acid tank is 100g / L, the acid concentration of the 3# acid tank is 120g / L, the acid concentration of the 4# acid tank is 140g / L, and the acid concentration of the 5# acid tank is 180g / L. 6-stage rinsing is adopted, and the conductivity of the rinsing water in the final rinsing tank is 120μ / cm.
[0082] 3) After rinsing, the strip is dried and enters the rolling mill for patterned plate rolling; the rolling process parameters are as follows: the flattening machine adopts the wet flattening mode, the flattening liquid increases the lubricant, reduces the rolling force, the concentration is 5%, the rolling force is 9000KN, the tension is 120KN, the bending roll is 300KN, and the rolling bean height ratio can be 8% to 10%. The pattern beans used are designed as follows: bean width 7.84mm, bean length 38mm, bean depth 2.5mm; after rolling to the kilometer number, the pattern roller is ground offline, and rolling continues until the pattern bean width is ≤5.5mm, and the roller is re-engraved offline. A single bean engraving can achieve a rolling mileage of 500Km;
[0083] 4) After rolling, it enters the straightening machine to further improve the strip shape after rolling. The straightening machine is put into use with an elongation of 0.4% to correct the rolled plate shape. The staggered degree of the bending roll and the straightening roll is set to 35mm and 35mm. After passing through the outlet looper, it is oiled and coiled to obtain the patterned plate.
[0084] After testing, the thickness of the obtained patterned plate is 0.97mm, the yield strength is 372Mpa, the width of the patterned plate is 1500mm, the bean height ratio is 9%, the bean width is 5.5-7.84mm, and the bean length is 26-38mm.
[0085] Example 3
[0086] A production process for a continuously pickled cold-rolled checkered plate comprises the following steps:
[0087] S1. Steelmaking and continuous casting: prepare base material raw materials, including the following components in percentage by weight: C: 0.04%, Si: 0.045%, Mn: 0.1%, P: 0.02%, S: 0.005%, and the balance is Fe and impurities; pour the molten steel obtained by base material steelmaking into a crystallizer for drawing to obtain a steel billet;
[0088] S2, strip rolling: step S2 includes rough rolling, finishing rolling and coiling processes; wherein, the rough rolling and final rolling temperatures are controlled at 1080°C, and the target thickness of the rough rolling slab is 14mm; the finishing rolling adopts 5-stand rolling, and F1-F5 are all smooth rollers; the reduction rates of F1-F5 are 55%, 35%, 35%, 25% and 21% respectively; the finishing rolling start temperature is controlled at 1020°C as a whole, and the final rolling temperature is 870°C; the coiling temperature of the laminar cooling coiling in the coiling process is 650°C; the strip thickness obtained in step S2 is 1.05-1.09 times the target thickness of the patterned plate.
[0089] S3, cold rolling pattern comprises the following steps:
[0090] 1) After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the welding machine through the pinch roller for head and tail welding to achieve the purpose of continuous production;
[0091] 2) After the strip passes through the entrance looper and the descaling machine, it enters the pickling tank to remove the surface iron oxide scale, and is rinsed in the rinsing tank to remove the residual chloride ions on the surface; wherein, the elongation of the descaling machine is 0.4%, the bending stagger is 45mm, and the straightening stagger is 45mm; the pickling speed is 150m / min, and the shallow turbulent 5-level pickling is adopted, the acid temperature is 80℃, the acid concentration of the 1# acid tank is 60g / L, the acid concentration of the 2# acid tank is 85g / L, the acid concentration of the 3# acid tank is 110g / L, the acid concentration of the 4# acid tank is 120g / L, and the acid concentration of the 5# acid tank is 160g / L; the rinsing adopts 6-level rinsing, and the conductivity of the rinsing water in the final rinsing tank is 80μ / cm;
[0092] 3) After rinsing, the strip is dried and enters the rolling mill for patterned plate rolling; the rolling process parameters are as follows: the flattening machine adopts the wet flattening mode, the flattening liquid increases the lubricant, reduces the rolling force, the concentration is 4%, the rolling force is 7000KN, the tension is 100KN, the bending roll is 200KN, and the rolling bean height ratio can be 8% to 10%; the pattern beans used are designed as follows: bean width 7.84mm, bean length 38mm, bean depth 2.5mm; after rolling to the kilometer number, the pattern roller is ground offline, and rolling is continued until the pattern bean width is ≤5.5mm, and the roller is re-engraved offline, and a single bean engraving can achieve a rolling mileage of 500Km;
[0093] 4) After rolling, it enters the straightening machine to further improve the strip shape after rolling. The straightening machine is put into use with an elongation of 0.4% to correct the rolled plate shape. The staggered degree of the bending roll and the straightening roll is set to 30mm and 32mm. After passing through the outlet looper, it is oiled and coiled to obtain the patterned plate.
[0094] After testing, the thickness of the obtained patterned plate is 0.95mm, the yield strength is 383Mpa, the width of the patterned plate is 1500mm, the bean height ratio is 10%, the bean width is 5.5-7.84mm, and the bean length is 26-38mm.
[0095] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A production process for a continuous pickling cold-rolled patterned plate, characterized in that: The following steps are involved: S1. Steelmaking and continuous casting: The molten steel obtained by base material steelmaking is poured into a crystallizer for drawing to obtain a steel billet; S2. Strip steel rolling: steel billets are rolled into strip steel; S3. Cold-rolled pattern: After the obtained strip steel is pickled, a pattern is rolled on the strip steel by cold rolling, and then the rolled pattern plate is coiled by a coiler to obtain a patterned plate.
2. The production process of the continuous pickling cold-rolled checkered plate according to claim 1 is characterized in that: In step S1, the base material is made of high temperature B-added or ferrite rolled raw material.
3. The production process of the continuous pickling cold-rolled checkered plate according to claim 1, characterized in that: In step S1, the raw materials of the base material include the following components in percentage by mass: C: ≤0.05%, Si: 0.038% to 0.055%, Mn: 0.06% to 0.2%, P≤0.025%, S≤0.006%, and the remainder is Fe and impurities.
4. The production process of the continuous pickling cold-rolled checkered plate according to claim 1 is characterized in that: Step S2 includes rough rolling, finishing rolling and coiling processes; wherein, the rough rolling and finishing rolling temperatures are controlled at 1040-1100°C, and the target thickness of the rough rolling slab is 8-18mm; the finishing rolling adopts 5-stand rolling, and F1-F5 are smooth rollers; the reduction rates of F1-F5 are 50-60%, 30-40%, 30-40%, 20-30%, and 18-25% respectively; the finishing rolling start temperature is controlled at 980-1060°C as a whole, and the finishing rolling temperature is 850-895°C; the coiling temperature of laminar cooling coiling is 630-670°C.
5. The production process of the continuous pickling cold-rolled checkered plate according to claim 1, characterized in that: The thickness of the steel strip obtained in step S2 is 1.05 to 1.09 times the target thickness of the patterned plate.
6. The production process of the continuous pickling cold-rolled checkered plate according to claim 1, characterized in that: Step S3 includes the following steps: 1) After uncoiling, the strip is straightened and sheared at the head and tail, and then enters the welding machine through the pinch roller for head and tail welding to achieve the purpose of continuous production; 2) After the strip passes through the entrance looper and descaling machine, it enters the pickling tank to remove the surface oxide scale, and is rinsed in the rinsing tank to remove the residual chloride ions on the surface; 3) After rinsing, the strip is dried and enters the rolling mill for patterned plate rolling; 4) After rolling, it enters the straightening machine to further improve the shape of the strip after rolling, passes through the outlet loop, and then is oiled and coiled to obtain the patterned plate.
7. The production process of the continuous pickling cold-rolled checkered plate according to claim 6, characterized in that: In step 2), the elongation of the phosphorus breaking machine is 0.4-0.5%, the bending stagger is 40-50mm, and the straightening stagger is 40-50mm; in step 2), the pickling speed is 100-200m / min, and the shallow turbulent 5-level pickling is adopted, the acid temperature is 70-85°C, the acid concentration of the 1# acid tank is 30-80g / L, the acid concentration of the 2# acid tank is 70-100g / L, the acid concentration of the 3# acid tank is 90-120g / L, the acid concentration of the 4# acid tank is 100-140g / L, and the acid concentration of the 5# acid tank is 150-180g / L; in step 2), rinsing adopts 6-level rinsing, and the conductivity of the rinsing water in the final rinsing tank is 50-120μ / cm.
8. The production process of the continuous pickling cold-rolled checkered plate according to claim 6, characterized in that: In step 3), the rolling process parameters are as follows: the flattening machine adopts wet flattening mode, the flattening liquid increases lubricant, reduces rolling force, concentration is 2-5%, rolling force is 5000-9000KN, tension is 70-120KN, bending roller is 100-300KN, and rolling bean height ratio can be achieved at 6%-15%; the pattern beans used in step 3) are designed as follows: bean width 7.84mm, bean length 38mm, bean depth 2.5mm; after rolling to the kilometer number, the pattern roller is ground offline, and rolling continues until the pattern bean width is ≤5.5mm, the roller is offline and the bean is re-engraved, and a single bean engraving can achieve a rolling mileage of 500Km; the rollers used in step 3) are cast iron rollers, the roller convexity is +0.07-0.15mm, and the supporting roller convexity is +0.05-0.1mm.
9. The production process of the continuous pickling cold-rolled checkered plate according to claim 6, characterized in that: In step 4), the tension leveler 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.
10. The production process of the continuous pickling cold-rolled checkered plate according to claim 1, characterized in that: The obtained patterned plate has a thickness of 0.7 to 1 mm and a yield strength of 350 to 380 MPa.