Method for continuous pickling of ordinary oriented silicon steel

Abstract

The present application discloses a method for continuous pickling of ordinary oriented silicon steel. The method comprises preheating a coil of ordinary oriented silicon steel to 60°C to 70°C; repairing the heated coil to obtain a coil with defective parts removed; rolling the repaired coil to obtain a coil with preliminary descaling; welding the ends of the initially descaling coil and grinding and brushing it to produce microcracks and thinning on the surface of the coil, thereby obtaining a coil with reduced and thinned surface iron oxide scale; pickling the coil with reduced and thinned surface iron oxide scale to obtain pickled ordinary oriented silicon steel. The present application discloses a method for continuous pickling of ordinary oriented silicon steel, which can solve the problems caused by the wavy and sickle-shaped head and tail of ordinary oriented silicon steel and achieve stable pickling of ordinary oriented silicon steel through plates, and accelerate the pickling rate by physical descaling and adding accelerators.

Description

Technical Field

[0001] The present application belongs to the technical field of silicon steel manufacturing processes, and in particular relates to a method for continuous pickling of ordinary oriented silicon steel. Background Art

[0002] Grain-oriented silicon steel requires complex manufacturing equipment and processes, strict composition control, and extremely low impurity content requirements. The manufacturing process is lengthy and subject to numerous influencing factors. Therefore, its product quality is often considered a key indicator of a country's specialty steel manufacturing capabilities. Grain-oriented silicon steel is further divided into high-induction grain-oriented silicon steel (HIB) and conventional grain-oriented silicon steel (CGO). High-induction grain-oriented silicon steel (HIB) typically requires normalizing treatment, followed by shot blasting and pickling. Shot blasting of HIB coils loosens the surface oxide scale, making pickling easier.

[0003] However, common grain-oriented silicon steel (CGO) does not require normalizing treatment, and the pickling unit basically does not have shot blasting equipment. Therefore, the iron oxide scale on the surface of common grain-oriented silicon steel is dense, making pickling more difficult. Common grain-oriented silicon steel (CGO) is hot-rolled using medium and high temperature heating, which makes the edge rot of the steel coil greater than that of high magnetic induction grain-oriented silicon steel (HIB). The material is brittle and has poor bending performance. During the continuous pickling process, the edge rot is prone to expansion and strip breakage in the loop, making it difficult to coil using the traditional continuous pickling method. Common grain-oriented silicon steel (CGO) pickling currently mainly adopts a push-pull production process. The advantage of this process is that the technology is relatively mature and the process is relatively stable. However, the push-pull production process has low production efficiency and high cost, and has the following problems:

[0004] (1) Push-pull pickling belongs to the single-roll push-pull method. The speed of the head threading and the tail swinging is low, which easily causes the instability of the process quality of the head, tail and middle parts;

[0005] (2) During the push-pull pickling process, the head and tail coils are in a tension-free state. If the plate shape is poor or there is a sickle bend at the head and tail, it is easy to cause the steel coils to deviate from the unit and scratch the equipment, causing damage or breakage. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, an embodiment of the present application provides a method for continuous pickling of ordinary oriented silicon steel, which can solve the problems caused by the wavy shape and sickle bend of the head and tail of ordinary oriented silicon steel through preheating, rework, roller-type scale breaking, laser submerged arc welding, grinding roller-type grinding and brushing to reduce iron oxide scale, pickling and other steps, and achieve stable pickling of ordinary oriented silicon steel. The pickling rate can be accelerated by physical scale breaking and adding accelerators.

[0007] In a first aspect, the present application provides a method for continuously pickling ordinary grain-oriented silicon steel, the method comprising:

[0008] The ordinary oriented silicon steel coil is preheated in a tunnel-type steam preheating furnace to heat the coil to 60℃~70℃;

[0009] The steel coil heated to 60℃~70℃ is repaired to obtain a steel coil with defective parts removed;

[0010] The steel coil with defective parts removed is rolled to produce micro cracks on the iron oxide scale on the surface of the steel coil, thus obtaining a steel coil with preliminary descaling;

[0011] The adjacent initially scaled steel coils are laser submerged arc welded at their ends to obtain a continuous initially scaled steel coil:

[0012] The initially scaled continuous steel coil is ground and brushed to produce micro cracks on the surface of the steel coil and reduce the thickness, thereby obtaining a steel coil with reduced surface iron oxide scale and reduced thickness;

[0013] The steel coil with reduced surface iron oxide scale and reduced thickness is pickled to obtain pickled common oriented silicon steel.

[0014] In one embodiment of the present application, repairing a steel coil heated to 60°C to 70°C includes removing tongue, wave, and sickle defective portions of the steel coil heated to 60°C to 70°C to obtain a steel coil with the defective portions removed.

[0015] In one embodiment of the present application, rolling the steel coil with the defective portion removed includes:

[0016] The double-roll pressing rollers on the uncoiler are used to press the steel coil with defective parts removed, so that the iron oxide scale on the surface of the steel coil produces micro cracks, thus obtaining a steel coil with preliminary descaling.

[0017] In one embodiment of the present application, the process parameters that need to be met for laser submerged arc welding of the adjacent preliminarily scaled steel coils are: the welding speed of laser submerged arc welding is 2.5m / min~3.5m / min, the wire feeding speed is 3.0mm / min~4.0m / min, the laser power is 2.5KW~5KW, the gap is 0.20mm~0.30mm; the preheating power is 7KW~15KW, and the annealing power is 10KW~15KW.

[0018] In one embodiment of the present application, the method for continuous pickling of ordinary grain-oriented silicon steel further includes:

[0019] A steel coil supply device is used to continuously supply the steel coils to be pickled to the pickling equipment.

[0020] In one embodiment of the present application, the steel coil supply device uses at least three layers of loops to transport continuous steel coils.

[0021] In one embodiment of the present application, the use of a three-layer looper to transport the steel coil includes using a three-layer looper steering roller with a large roller diameter to transport the steel coil, and the large roller diameter is diameter*length=310mm*1500mm.

[0022] In the first embodiment of the present application, the steel coil supply device is used to continuously supply the steel coil to be pickled to the pickling equipment, and further comprises:

[0023] A looper induction heater is set in the middle of the three-layer looper to keep the steel coil warm, and the temperature is set at 50℃~70℃.

[0024] In one embodiment of the present application, grinding and brushing the steel coil includes:

[0025] Before the steel coil enters the pickling tank, a roller-type grinding brush is used to grind and brush the steel coil to remove part of the iron oxide scale on the surface of the steel coil.

[0026] In one embodiment of the present application, grinding and brushing the steel coil further includes using high-pressure water to rinse the brushed-off iron oxide scale to partially break the scale layer on the surface of the steel coil.

[0027] In one embodiment of the present application, pickling the steel coil with reduced and thinned surface scale includes pickling the steel coil with reduced and thinned surface scale using acid solution in at least five pickling tanks; wherein the acid solution temperature for pickling is 80° C. to 85° C., and the five pickling tanks need to respectively meet the following process parameters:

[0028] The first pickling tank has an acid concentration of 100g / l to 180g / l;

[0029] The second pickling tank has an acid concentration of 180g / l to 220g / l;

[0030] The third pickling tank has an acid concentration of 180g / l to 220g / l;

[0031] The fourth pickling tank has an acid concentration of 180g / l to 220g / l;

[0032] The fifth pickling tank has an acid concentration of 220g / l to 300g / l;

[0033] The acid solutions in the second, third, and fourth pickling tanks all contained an accelerator, model VIGCEL1121. The concentration of the accelerator in the second pickling tank was 0.1% to 0.3% by volume, and in the third and fourth pickling tanks it was 0.1% to 0.4% by volume. VIGCEL1121 was purchased from Shenzhen Longway Electric Co., Ltd.

[0034] In one embodiment of the present application, the method for continuous pickling of ordinary grain-oriented silicon steel further includes:

[0035] The material is W 18 The Cr4V2 shear blade shears the common grain-oriented silicon steel (CGO) to obtain the common grain-oriented silicon steel with defective edges removed.

[0036] In one embodiment of the present application, the shearing parameters of the shear blades need to meet the following requirements: a shear blade gap of 0.20 mm to 0.3 mm, and an overlap of 0.50 mm to 0.70 mm.

[0037] In a second aspect, the present application provides a common grain-oriented silicon steel obtained by the above-mentioned method of continuous pickling of common grain-oriented silicon steel.

[0038] The method for continuous pickling of ordinary oriented silicon steel in the embodiment of the present application is to perform the steps of preheating, rework, roller-type descaling, laser submerged arc welding, grinding roller-type brushing to reduce iron oxide scale, pickling, etc. on the steel coil of ordinary oriented silicon steel. It can solve the problems caused by the wavy shape and sickle bend of the head and tail of ordinary oriented silicon steel, achieve stable pickling of ordinary oriented silicon steel, and accelerate the pickling rate by physical descaling and adding accelerators. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1 1 is a schematic flow chart of a method for continuous pickling of ordinary grain-oriented silicon steel provided in an embodiment of the present application;

[0041] Figure 2 It is a structural schematic diagram of the continuous pickling device provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 1. Tunnel-type steam preheating furnace; 2. Ground roller shear; 3. Steel coil; 4. Double-roll press roller; 5. Laser welder with wire filler; 6. Three-layer looper; 7. Looper induction heater; 8. Looper steering roller; 9. Roller grinding brush; 10. First pickling tank; 11. Second pickling tank; 12. Third pickling tank; 13. Fourth pickling tank; 14. Fifth pickling tank; 15. Disc shear. DETAILED DESCRIPTION

[0044] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or device comprising the elements.

[0046] In order to solve the problems in the prior art, the present invention provides a method for continuous pickling of ordinary grain-oriented silicon steel. The method for continuous pickling of ordinary grain-oriented silicon steel provided in the present invention is first introduced below.

[0047] Figure 1 The figure shows a flow chart of a method for continuous pickling of ordinary grain-oriented silicon steel provided by an embodiment of the present application. Figure 1 As shown, the method for continuous pickling of ordinary grain-oriented silicon steel includes:

[0048] S1. Preheat the ordinary oriented silicon steel coil in a tunnel-type steam preheating furnace to 60°C to 70°C;

[0049] S2. Repairing the steel coil heated to 60° C. to 70° C. to obtain a steel coil with defective parts removed;

[0050] S3. Rolling the steel coil with the defective portion removed to generate microcracks on the iron oxide scale on the surface of the steel coil, thereby obtaining a preliminarily scaled steel coil;

[0051] S4, performing laser submerged arc welding on the ends of the adjacent preliminarily descaled steel coils to obtain a preliminarily descaled continuous steel coil;

[0052] S5. Grind and brush the initially scaled continuous steel coil to produce micro cracks on the surface of the steel coil and reduce the thickness, thereby obtaining a steel coil with reduced surface iron oxide scale and reduced thickness.

[0053] S6. Pickling the steel coil with reduced and thinned surface iron oxide scale to obtain pickled ordinary oriented silicon steel.

[0054] The method for continuous pickling of ordinary oriented silicon steel in the embodiment of the present application is to preheat, repair, roll-press descaling, laser submerged arc welding, grind and brush to reduce and thin the iron oxide scale, and pickle the steel coils of ordinary oriented silicon steel. This method can solve the problems caused by the wavy shape and sickle bend of the head and tail of ordinary oriented silicon steel, achieve stable pickling of the ordinary oriented silicon steel plate, and accelerate the pickling rate by physical descaling and adding accelerators. Among them, repair makes the steel coils undergoing pickling regular; roll-press descaling and grind and brush to reduce and thin the iron oxide scale layer, so that the iron oxide scale flakes on the surface are reduced and thinned, which is convenient for pickling; laser submerged arc welding is used to weld discontinuous steel coils together, so that the steel coils can be stably pickled in the pickling process, solving the problem of unstable quality of the pickling process caused by inconsistent feeding speed of the steel coils.

[0055] In one embodiment of the present application, Figure 2 As shown, preheating the ordinary grain-oriented silicon steel coil using a tunnel-type steam preheating furnace includes preheating using a tunnel-type steam preheating furnace 1 to heat the coil to a temperature of 60° C. to 70° C.

[0056] In one embodiment of the present application, repairing a steel coil heated to 60°C to 70°C includes removing tongue, wave, and sickle defective portions of the steel coil heated to 60°C to 70°C to obtain a steel coil with the defective portions removed.

[0057] In one embodiment of the present application, the repair of the steel coil heated to 60℃~70℃ includes using a ground roller head cutting device located on a saddle to remove the strapping and heat the steel coil to 60℃~70℃, cut off the tongue, cut off the wave shape, and cut off the tongue, wave shape, and sickle bend defective parts of the steel coil heated to 60℃~70℃, so as to obtain a steel coil with a more regular shape. Figure 2 As shown, the ground roller cutting device is a ground roller flying shear 2 arranged on a saddle.

[0058] In one embodiment of the present application, Figure 2 As shown, rolling the steel coil 3 with the defective portion removed includes:

[0059] The uncoiler's twin-roll press rollers (4) are used to press the steel coil (3) with the defective areas removed, creating microcracks in the iron scale on the coil's surface. This results in a pre-scaled coil. The pre-scaled coil has microcracks in the iron scale on its surface, but these are not visible to the naked eye.

[0060] In one embodiment of the present application, the method for continuous pickling of ordinary grain-oriented silicon steel further includes:

[0061] The ends of the adjacent initially scaled steel coils are laser submerged arc welded to obtain a continuous steel coil.

[0062] In one embodiment of the present application, the process parameters that need to be met for laser submerged arc welding of the adjacent preliminarily scaled steel coils are: the welding speed of laser submerged arc welding is 2.5m / min~3.5m / min, the wire feeding speed is 3.0mm / min~4.0m / min, the laser power is 2.5KW~5KW, the gap is 0.20mm~0.30mm; the preheating power is 7KW~15KW, and the annealing power is 10KW~15KW.

[0063] The method for continuous pickling of grain-oriented silicon steel in the embodiment of the present application is as follows: Figure 2 As shown, the initially scaled steel coils are welded by using a laser wire welding machine 5, that is, the tail of the previous steel coil and the head of the next steel coil are welded, and continuous steel coils are formed by welding and pass through the pickling unit to ensure the continuity of the pickling process of the pickling unit, so that the quality of the pickling process remains stable and the problem of unstable quality of the pickling process at the head, tail and middle parts is solved.

[0064] The method for continuous pickling of ordinary grain-oriented silicon steel according to the embodiment of the present application further includes:

[0065] A steel coil supply device is used to continuously supply the steel coils to be pickled to the pickling equipment.

[0066] In one embodiment of the present application, Figure 2 As shown, the coil supply device uses at least three layers of loopers 6 to convey continuous coils. The three-layer looper is used to store the coils, allowing for stable delivery of the coils to the pickling equipment during laser submerged arc welding. After laser submerged arc welding is completed, the three-layer looper continues to rewind the coils, storing the coils for the next laser submerged arc welding cycle.

[0067] In one embodiment of the present application, the use of a three-layer looper to convey the steel coil includes using a large-diameter three-layer looper turning roller to convey the steel coil. The large roller diameter is diameter * length = 310mm * 1500mm. Increasing the roller diameter of the looper turning roller can reduce the bending curvature of the steel coil to a certain extent, thereby reducing cracks in the steel coil.

[0068] Since the continuous pickling line requires a constant pickling process speed, and the laser submerged arc welding at the head of the pickling line requires the coils connected at both ends to be stopped before welding, a looper is installed to meet both requirements. The looper is a device that can store a certain length of steel coil and continuously transport it to ensure stable pickling quality during the pickling process. The coils run on the rollers of the looper's multiple trolleys.

[0069] Therefore, the looper needs to have a sufficiently long coil to ensure the pickling process speed. After the welding of the first and last coils is completed, the laser submerged arc welding entrance section increases the conveying speed, which is higher than the speed of the pickling process. The looper is then filled with the coils used in the pickling process to ensure the steel coils required for the pickling section for the next laser submerged arc welding. At the same time, the use of a three-layer looper to convey the coils into the pickling tank ensures that the coils are always under tension, preventing the coils from deviating from the unit in the case of poor plate shape or camber at the head and tail, which could cause them to scratch the equipment and cause damage or breakage.

[0070] In this application fee embodiment, if Figure 2 As shown, the steel coil supply device is used to continuously supply the steel coil to be pickled to the pickling equipment, and further includes:

[0071] A looper induction heater 7 is provided in the middle of the three-layer looper to keep the steel coil warm, and the temperature is set at 50°C to 70°C.

[0072] In one embodiment of the present application, the loop induction heater is an automatic temperature compensation loop induction heater.

[0073] In one embodiment of the present application, the automatic temperature compensation looper induction heater is an electromagnetic induction heater, which performs electromagnetic induction heating on the steel coil in the looper.

[0074] Due to the high brittleness of oriented silicon steel, the steel coil in the looper needs to be turned and bent repeatedly. If the temperature of the steel coil is lower than 50℃, the cold brittleness of the steel coil increases, and the edges and welds that were originally rotten are easily broken by the expansion of bending cracks. After being heated by the looper induction heater, the temperature of the steel coil is raised to 70℃, which is conducive to improving the toughness of the steel coil and avoiding bending and breaking in the looper.

[0075] In one embodiment of the present application, Figure 2 As shown, the steel coil is subjected to grinding and brushing, including:

[0076] Before the steel coil enters the pickling tank, the roller-type grinding brush roller 9 is used to grind and brush the steel coil to remove part of the iron oxide scale on the surface of the steel coil.

[0077] In one embodiment of the present application, the grinding and brushing of the steel coil further includes using high-pressure water to rinse away the iron oxide scale brushed off, so as to partially break the scale layer on the surface of the steel coil.

[0078] In one embodiment of the present application, Figure 2 As shown, pickling the steel coil with reduced and thinned surface scale includes pickling the steel coil with reduced and thinned surface scale using acid solution in at least five pickling tanks; wherein the acid solution temperature for pickling is 80°C to 85°C, and the five pickling tanks need to meet the following process parameters respectively:

[0079] The first pickling tank 10 has an acid concentration of 100 g / l to 180 g / l;

[0080] The second pickling tank 11 has an acid concentration of 180 g / l to 220 g / l;

[0081] The third pickling tank 12 has an acid concentration of 180 g / l to 220 g / l;

[0082] The fourth pickling tank 13 has an acid concentration of 180 g / l to 220 g / l;

[0083] The fifth pickling tank 14 has an acid concentration of 220 g / l to 300 g / l;

[0084] The acid solutions in the second, third, and fourth pickling tanks all contained an accelerator, model VIGCEL1121. The concentration of the accelerator in the second pickling tank was 0.1% to 0.3% by volume, and in the third and fourth pickling tanks it was 0.1% to 0.4% by volume. VIGCEL1121 was purchased from Shenzhen Longway Electric Co., Ltd.

[0085] In one embodiment of the present application, the method for continuous pickling of ordinary grain-oriented silicon steel further includes:

[0086] The material is W 18 The Cr4V2 shear blade shears the common grain-oriented silicon steel (CGO) to obtain the common grain-oriented silicon steel with defective edges removed.

[0087] In one embodiment of the present application, the shearing parameters of the shear blades need to meet the following requirements: a shear blade gap of 0.20 mm to 0.3 mm, and an overlap of 0.50 mm to 0.70 mm.

[0088] The method for continuous pickling of ordinary oriented silicon steel in the embodiment of the present application is as follows: Figure 2 As shown, the material used is W 18The Cr4V2 disc shear with 15 blades trims the coils, producing high-quality edge coils for rolling. Otherwise, poor trimming can lead to burrs or strip breakage. Finally, the sheared coils are coiled for standby use or rolled.

[0089] In a second aspect, the present application provides a grain-oriented silicon steel obtained by the above-mentioned method of continuous pickling of ordinary grain-oriented silicon steel.

[0090] The technical solution of the silicon of the present application is described in detail below through specific embodiments.

[0091] Example 1

[0092] The grain-oriented silicon steel hot-rolled coils 3A12976900 and 3A12976800 are pickled using the continuous pickling method for ordinary grain-oriented silicon steel of the present application, comprising:

[0093] S1. Preheat the hot-rolled coils 3A12976900 and 3A12976800 of common grain-oriented silicon steel using a tunnel-type steam preheating furnace to a temperature of 68°C to 70°C.

[0094] S2. Repairing the steel coil heated to 68° C. to 70° C., including removing the strapping and heating the steel coil to 68° C. to 70° C. by using a floor roller shear 2 to cut off tongue, wave, and camber defects, thereby obtaining a steel coil with the defective parts removed;

[0095] S3. Rolling the steel coil with the defective portion removed to generate microcracks in the iron oxide scale on the surface of the steel coil, including using a double-roll pressing roller 4 provided with the uncoiler to roll the steel coil 3 with the defective portion removed to generate microcracks in the iron oxide scale on the surface of the steel coil, thereby obtaining a preliminarily scaled steel coil;

[0096] S4. Use a laser wire welder 5 to perform laser submerged arc welding on the ends of the adjacent preliminarily descaled steel coils to obtain a continuous steel coil. The process parameters required for laser submerged arc welding are as follows: a welding speed of 2.7 m / min, a wire feeding speed of 3.5 mm / min, a laser power of 2.5 kW, a gap of 0.23 mm, a preheating power of 11 kW, and an annealing power of 14 kW.

[0097] S5. A three-layer looper 6 is used as a steel coil supply device to continuously supply a continuous number of steel coils to be pickled to the pickling equipment. The three-layer looper 6 uses a large roller diameter three-layer looper turning roller with a diameter * length = 310mm * 1500mm to convey the steel coils. A looper induction heater 7 is provided in the middle of the three-layer looper to keep the steel coils warm. The temperature is set at 65°C to 70°C. The looper induction heater is an electromagnetic induction device and is capable of automatic temperature compensation.

[0098] S6. The continuous steel coils that have been preliminarily descaled and are set on the three-layer looper are ground and brushed with roller grinding brushes 9 to generate microcracks on the surface of the steel coils and reduce the thickness, thereby obtaining steel coils with reduced and thinner surface iron oxide scale. In this embodiment, the roller grinding brushes 9 are five-roller grinding brushes. After the steel coils are brushed with the roller grinding brushes 9, the removed iron oxide scale is rinsed clean with high-pressure water to partially break the scale layer on the surface of the steel coils.

[0099] S7. Pickling the steel coil with reduced surface scale and reduced thickness is performed using acid solutions from at least five pickling tanks to obtain pickled ordinary grain-oriented silicon steel. The temperature of the pickling acid solution is 82° C. to 83° C., and the five pickling tanks need to meet the following process parameters:

[0100] The first pickling tank 10 has an acid concentration of 150 g / l to 180 g / l;

[0101] The second pickling tank 11 has an acid concentration of 190 g / l to 220 g / l;

[0102] The third pickling tank 12 has an acid concentration of 200 g / l to 210 g / l;

[0103] The fourth pickling tank 13 has an acid concentration of 210 g / l to 220 g / l;

[0104] The fifth pickling tank 14 has an acid concentration of 220 g / l to 290 g / l;

[0105] The acid solutions of the second, third, and fourth pickling tanks were all added with an accelerator of model VIGCEL1121. The concentration of the accelerator in the pickling solution of the second pickling tank was 0.2% by volume of the acid solution, and the concentration of the accelerator in the pickling solution of the third and fourth pickling tanks was 0.25% by volume of the acid solution. The accelerator of model VIGCEL1121 was purchased from Shenzhen Longway Electric Co., Ltd.

[0106] S8, the pickled ordinary oriented silicon steel is made of W 18 The Cr4V2 circular shear with 15 cutting blades trims the steel coils to obtain steel coils with excellent edge quality.

[0107] The method of continuous pickling of ordinary oriented silicon steel in this embodiment is as follows: preheating, descaling, welding, looper heating, five-roll grinding and descaling, five-tank pickling, W 18 The continuous pickling method of Cr4V2 alloy blade trimming produces pickled finished coils with good surface quality and excellent edge quality, meeting customers' quality requirements for oriented silicon steel pickled coils.

[0108] Example 2

[0109] The grain-oriented silicon steel hot-rolled coils 3A12635900 and 3A12641700 are pickled using the continuous pickling method for ordinary grain-oriented silicon steel of the present application, comprising:

[0110] S1. Preheat the hot-rolled coils 3A12635900 and 3A12641700 of common grain-oriented silicon steel using a tunnel-type steam preheating furnace to a temperature of 67°C to 70°C.

[0111] S2. Repairing the steel coil heated to 65° C. to 68° C., including removing the strapping and heating the steel coil to 67° C. to 70° C. by using a floor roller shear 2 to cut off tongue, wave, and camber defects of the steel coil heated to 67° C. to 70° C., thereby obtaining a steel coil with the defective portions removed;

[0112] S3, rolling the steel coil with the defective portion removed, including using a double-roll pressing roller 4 provided with the uncoiler to roll the steel coil 3 with the defective portion removed, so as to generate micro-cracks on the iron oxide scale on the surface of the steel coil, thereby obtaining a preliminarily scaled steel coil;

[0113] S4. Use a laser wire welder 5 to perform laser submerged arc welding on the ends of the adjacent preliminarily descaled steel coils to obtain a continuous steel coil. The process parameters required for laser submerged arc welding are as follows: a welding speed of 2.7 m / min, a wire feeding speed of 3.5 mm / min, a laser power of 2.5 kW, a gap of 0.23 mm, a preheating power of 11 kW, and an annealing power of 14 kW.

[0114] S5. A three-layer looper 6 is used as a steel coil supply device to continuously supply a continuous number of steel coils to be pickled to the pickling equipment. The three-layer looper 6 uses a large roller diameter three-layer looper turning roller with a diameter * length = 310mm * 1500mm to convey the steel coils. A looper induction heater 7 is provided in the middle of the three-layer looper to keep the steel coils warm. The temperature is set at 65°C to 70°C. The looper induction heater is an electromagnetic induction device and is capable of automatic temperature compensation.

[0115] S6. The continuous steel coil that has been preliminarily descaled and is set on the three-layer looper is ground and brushed with a roller grinding brush 9 to generate microcracks on the surface of the steel coil and reduce the thickness, thereby obtaining a steel coil with microcracks and thinning on the surface. In this embodiment, the roller grinding brush 9 is a five-roller grinding brush. After the steel coil is brushed with the roller grinding brush 9, the iron oxide scale brushed off is rinsed with high-pressure water to partially break the scale layer on the surface of the steel coil.

[0116] S7. Pickling the steel coil with microcracks and thinning on the surface is performed using acid solutions from at least five pickling tanks to obtain pickled ordinary oriented silicon steel. The temperature of the pickling acid solution is 83° C. to 85° C., and the five pickling tanks need to meet the following process parameters:

[0117] The first pickling tank 10 has an acid concentration of 120 g / l to 150 g / l;

[0118] The second pickling tank 11 has an acid concentration of 200 g / l to 210 g / l;

[0119] The third pickling tank 12 has an acid concentration of 210 g / l to 220 g / l;

[0120] The fourth pickling tank 13 has an acid concentration of 210 g / l to 220 g / l;

[0121] The fifth pickling tank 14 has an acid concentration of 230 g / l to 280 g / l;

[0122] The acid solutions of the second, third, and fourth pickling tanks were all added with an accelerator of model VIGCEL1121. The concentration of the accelerator in the pickling solution of the second pickling tank was 0.3% by volume of the acid solution, and the concentration of the accelerator in the pickling solution of the third and fourth pickling tanks was 0.35% by volume of the acid solution. The accelerator of model VIGCEL1121 was purchased from Shenzhen Longway Electric Co., Ltd.

[0123] S8, the pickled ordinary oriented silicon steel is made of W 18 The Cr4V2 circular shear with 15 cutting blades trims the steel coils to obtain steel coils with excellent edge quality.

[0124] The method of continuous pickling of ordinary oriented silicon steel in this embodiment is as follows: preheating, descaling, welding, looper heating, five-roll grinding and descaling, five-tank pickling, W 18 The continuous pickling method of Cr4V2 alloy blade trimming produces pickled finished coils with good surface quality and excellent edge quality, meeting customers' quality requirements for oriented silicon steel pickled coils.

[0125] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working process described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the scope of protection of this application.

Claims

1. A method for continuous pickling of ordinary grain-oriented silicon steel, characterized in that: include: The ordinary oriented silicon steel coil is preheated in a tunnel-type steam preheating furnace to heat the coil to 60℃~70℃; Repairing the steel coil heated to 60-70°C, including removing the tongue, wave, and sickle defects of the steel coil heated to 60-70°C to obtain a steel coil with the defective parts removed; Rolling the steel coil with the defective portion removed to generate microcracks on the iron oxide scale on the surface of the steel coil, thereby obtaining a preliminarily scaled steel coil; The adjacent initially scaled steel coils are laser submerged arc welded at their ends to obtain a continuous initially scaled steel coil: A steel coil supply device is used to continuously supply steel coils to be pickled to the pickling equipment. The steel coil supply device uses a three-layer looper to convey the continuous steel coils. An automatic temperature compensation induction heater is set in the middle of the three-layer looper to keep the steel coils warm. The temperature is set at 50°C to 70°C. grinding and brushing the initially scaled continuous steel coil to generate microcracks on the surface of the steel coil and reduce the thickness, thereby obtaining a steel coil with reduced surface iron oxide scale and reduced thickness; The steel coil with reduced and thinned surface iron oxide scale is pickled to obtain pickled common oriented silicon steel.

2. The method according to claim 1, characterized in that The rolling of the steel coil with the defective portion removed comprises: The steel coil with the defective portion removed is rolled using a double-roll pressing roller provided on the uncoiler to obtain a preliminarily scaled steel coil.

3. The method according to claim 1, characterized in that The process parameters that need to be met for laser submerged arc welding of the adjacent preliminarily scaled steel coils are: the welding speed of laser submerged arc welding is 2.5m / min~3.5m / min, the wire feeding speed is 3.0mm / min~4.0m / min, the laser power is 2.5kW~5kW, the gap is 0.20mm~0.30mm; the preheating power is 7kW~15kW, and the annealing power is 10kW~15kW.

4. The method according to claim 1, wherein The grinding and brushing of the steel coil comprises: Before the steel coil enters the pickling tank, a roller-type grinding brush is used to grind and brush the steel coil to remove part of the iron oxide scale on the surface of the steel coil.

5. The method according to claim 4, characterized in that The grinding and brushing of the steel coil further includes using high-pressure water to rinse the brushed-off iron oxide scale to partially break the scale layer on the surface of the steel coil.

6. The method according to claim 1, wherein The pickling of the steel coil with reduced and thinned surface iron oxide scale includes pickling the steel coil with reduced and thinned surface iron oxide scale using acid solution in at least five pickling tanks; wherein the acid solution temperature for pickling is 80° C. to 85° C., and the five pickling tanks need to respectively meet the following process parameters: The first pickling tank has an acid concentration of 100g / l to 180g / l; The second pickling tank has an acid concentration of 180g / l to 220g / l; The third pickling tank has an acid concentration of 180g / l to 220g / l; The fourth pickling tank has an acid concentration of 180g / l to 220g / l; The fifth pickling tank has an acid concentration of 220g / l to 300g / l; An accelerator of model VIGCEL1121 is added to the acid solution of the second pickling tank, the third pickling tank, and the fourth pickling tank; wherein the concentration of the accelerator in the pickling solution of the second pickling tank is 0.1% to 0.3% by volume of the acid solution, and the concentration of the accelerator in the pickling solution of the third pickling tank and the fourth pickling tank is 0.1% to 0.4% by volume of the acid solution.

7. The method according to claim 1, characterized in that Also includes: The material is W 18 The Cr4V2 shearing blade shears the ordinary oriented silicon steel to obtain the ordinary oriented silicon steel with the defective edges removed; wherein the shearing parameters of the shearing blade need to meet the following requirements: the shearing blade gap is 0.20mm to 0.3mm, and the overlap is 0.50mm to 0.70mm.

8. The method according to claim 1, characterized in that The use of a three-layer looper to transport the steel coil includes using a three-layer looper steering roller with a large roller diameter to transport the steel coil. The specification of the three-layer looper steering roller with a large roller diameter is diameter*length=310mm*1500mm.

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