An ultra-low-carbon low-manganese sulfur ratio electrode flat steel and a rolling forming method thereof

Abstract

The application discloses an ultra-low-carbon low-manganese-sulfur-ratio electrode flat steel and a rolling forming method thereof, and the method comprises the following steps: S1, cutting a slab into a square steel and then heating the square steel into a hot blank in a step-by-step heating furnace; S2, starting rolling after high-pressure water desulfurization of the hot blank; S3, adopting a hot saw to process the rolled material into multiple-size electrode flat steels after on-line straightening of the last pass of the rolling forming; and S4, adopting a stacking cooling method to cool the multiple-size electrode flat steels to room temperature after cooling of the multiple-size electrode flat steels on a cooling bed. The application solves the technical problem of corner cracking of the ultra-low-carbon steel under the condition of low manganese-sulfur ratio by reasonably controlling the cutting quality of the ultra-low-carbon steel slab, strictly controlling the heating temperature of the cut square blank, the temperature after water desulfurization, the rolling temperature and the stacking temperature, and meanwhile, the electrode flat steel with excellent electric conductivity is obtained.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to an ultra-low carbon, low manganese-sulfur ratio electrode flat steel and its rolling forming method. Background Technology

[0002] Electrode flat steel is an important component of the cathode in electrolytic cells, playing a role in evenly distributing current and improving the horizontal current in molten aluminum. Currently, the total output and national distribution structure of the electrolytic aluminum industry have undergone significant changes, and the material of cathode flat steel is increasingly favoring pure iron YT2 electrode flat steel, which has lower chemical impurity elements and excellent conductivity.

[0003] However, due to limitations in metallurgical technology, YT2 electrode flat steel has a low Mn / S ratio. Within a certain temperature range during heating and post-rolling cooling, low-melting-point Fe-FeS eutectic inevitably precipitates at the austenite grain boundaries, leading to "red brittleness" during rolling. This makes forming the flat steel extremely difficult, and the surface defects resemble overheated tofu-like cracks, with cracks primarily distributed along the grain boundaries, rendering it unusable. Increasing the Mn content to achieve an Mn / S ratio of 15–30 can prevent "red brittleness," but the higher Mn content reduces the electrical conductivity of the electrode flat steel. On the other hand, reducing the sulfur content to increase the Mn / S ratio is problematic because the process of reducing sulfur content in the steel during smelting is complex, sometimes requiring additional steps, increasing smelting difficulty and production costs.

[0004] To address the problems existing in the smelting process mentioned above, it is of great significance to develop an ultra-low carbon and low manganese-sulfur ratio electrode flat steel with uniform product structure and properties, significantly reduced corner cracking rate, and low resistivity. Summary of the Invention

[0005] The main objective of this invention is to provide an ultra-low carbon, low manganese-sulfur ratio electrode flat steel and its rolling forming method, which can be applied to the production of ultra-low carbon electrode flat steel under low manganese-sulfur ratio conditions. It solves the technical problem of corner cracking during the rolling process under low manganese-sulfur ratio conditions. The product has uniform microstructure and properties, significantly reduced corner cracking rate, and low resistivity. When applied to the cathode of the electrolytic cell in the electrolytic aluminum industry, the product plays a good conductive role and can provide an important guarantee for low power consumption production in the electrolytic aluminum industry.

[0006] According to one aspect of the present invention, a method for rolling ultra-low carbon and low manganese-sulfur ratio electrode flat steel is provided, comprising the following steps:

[0007] S1. After cutting the slab into square steel, heat it in a walking beam furnace to form hot billets;

[0008] S2. After the hot billet is descaled by high-pressure water, rolling begins.

[0009] S3. After the final pass of rolling is straightened online, the rolled material is processed into multi-length electrode flat steel using a hot saw.

[0010] S4. After cooling the multi-length electrode flat steel on the cooling bed, cool it to room temperature using the stacking cooling method.

[0011] According to an embodiment of the present invention, in step S1, during the heating process, the first burner is turned off, the second burner has a temperature range of 860℃±10℃~980℃±10℃, the third burner has a temperature range of 940℃±10℃~1040℃±10℃, and the soaking zone has a temperature range of 960℃±10℃~1020℃±10℃.

[0012] According to one embodiment of the present invention, in step S1, the total heating time is controlled to be ≥200 min, wherein the soaking time is ≥60 min.

[0013] According to one embodiment of the present invention, in step S2, the temperature of the hot billet after dephosphorization is controlled at 880℃±10℃~940℃±10℃.

[0014] According to one embodiment of the present invention, in step S2, the rolling temperature is controlled at 850℃±10℃~910℃±10℃.

[0015] According to one embodiment of the present invention, in step S3, the online straightening is performed through a UR mill, and the temperature exiting the UR mill is controlled at 800℃±10℃~850℃±10℃.

[0016] According to one embodiment of the present invention, in step S4, the multi-length electrode flat steel is cooled to 250±10℃~350℃±10℃ on a cooling bed.

[0017] According to another aspect of the present invention, an ultra-low carbon and low manganese-sulfur ratio electrode flat steel is provided, which is manufactured by the method mentioned in any of the above technical solutions.

[0018] According to one embodiment of the present invention, the ultra-low carbon, low manganese-sulfur ratio electrode flat steel is composed of the following components by weight percentage:

[0019] C≤0.005%, Si≤0.010%, Mn≤0.03%, P≤0.012%, S 0.006%~0.012%, Als 0.005%~0.020%, with the remainder being Fe and other unavoidable impurities.

[0020] According to one embodiment of the present invention, the mass ratio of Mn to S ranges from 2.0 to 5.0.

[0021] In an embodiment of the present invention, an ultra-low carbon, low manganese-sulfur ratio electrode flat steel and its rolling forming method are described. The method includes the following steps: slab cutting—slab finishing—slab heating—high-pressure water descaling—rolling—online straightening—multiple-length cutting—cooling on a cooling bed—stacking and slow cooling. By rationally controlling the cutting quality of the ultra-low carbon steel slab and strictly controlling the heating temperature, water descaling temperature, rolling temperature, and stacking temperature of the cut billet, the technical problem of corner cracking in ultra-low carbon steel rolling under low manganese-sulfur ratio conditions is solved, and electrode flat steel with excellent electrical conductivity is obtained. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some implementation examples of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A process flow diagram of a method for rolling ultra-low carbon and low manganese-sulfur ratio electrode flat steel according to an exemplary embodiment of the present invention is shown. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] like Figure 1 As shown, the present invention provides a method for rolling ultra-low carbon and low manganese-sulfur ratio electrode flat steel, which includes the following steps:

[0027] S1. After cutting the slab into square steel, heat it in a walking beam furnace to form hot billets;

[0028] S2. After the hot billet is descaled by high-pressure water, rolling begins.

[0029] S3. After the final pass of rolling is straightened online, the rolled material is processed into multi-length electrode flat steel using a hot saw.

[0030] S4. After cooling the multi-length electrode flat steel on the cooling bed, cool it to room temperature using the stacking cooling method.

[0031] In the ultra-low carbon and low manganese-sulfur ratio electrode flat steel rolling forming method according to an embodiment of the present invention, by reasonably controlling the cutting quality of ultra-low carbon steel slabs and strictly controlling the heating temperature of the cut billet, the temperature after water descaling, the rolling temperature and the stacking temperature, the technical problem of corner cracking of ultra-low carbon steel under low manganese-sulfur ratio conditions is solved, and electrode flat steel with excellent electrical conductivity is obtained.

[0032] The raw material for this invention is a continuously cast slab with a height of 200mm or 220mm and a width of 1030mm to 1240mm. It is produced by flame cutting. After cutting, the slag and cutting nodules are cleaned and the cutting width loss is controlled to be ≤5mm. The slab is then cut longitudinally into three square steel bars with uniform dimensions of 200mm or 220mm in height and 340mm to 410mm in width. The bars are then heated, descaled with high-pressure water, and rolled in 15 passes to form 150mm × 170mm electrode flat steel bars.

[0033] In step S1, during the heating process, the first burner is turned off, the second burner has a temperature range of 860℃±10℃~980℃±10℃, the third burner has a temperature range of 940℃±10℃~1040℃±10℃, and the soaking zone has a temperature range of 960℃±10℃~1020℃±10℃.

[0034] In step S2, the temperature of the hot billet after dephosphorization is controlled at 880℃±10℃~940℃±10℃.

[0035] The settings for the heating temperature and heating time of each section ensure that the billet is cut at a low temperature and heated evenly, with no obvious black marks on the surface of the billet, and also avoids defects such as overheating, burning, cracking, and perforation.

[0036] In step S2, high-pressure water descaling is used to remove iron oxide scale from the heated billet, preventing the iron oxide scale from being pressed into the surface of the rolled material during rolling and affecting the surface quality of the electrode flat steel. It can also improve the service life of the rolls. On the other hand, it can appropriately reduce the temperature of the hot billet during the billet opening process, and coordinate with the rolling process to open the billet at a lower temperature.

[0037] In step S2, the rolling temperature is controlled between 850℃±10℃ and 910℃±10℃. Controlling the initial rolling temperature effectively ensures that low-melting-point sulfides do not undergo grain boundary liquefaction, improving the bonding force and deformation coordination between grain boundaries during rolling. This prevents the formation of microcracks in the early stages of rolling and the formation of corner cracks due to the deformation and propagation of microcracks during the rolling process.

[0038] In step S3, the online straightening is performed using a UR mill, with the exit temperature controlled between 800℃±10℃ and 850℃±10℃. The online straightening capability of the UR mill improves the dimensional accuracy of single-length electrode flat steel and the hit rate of low curvature, and also enhances the subsequent slow cooling effect of stacking.

[0039] In step S4, the multi-length electrode flat steel is cooled to 250±10℃~350℃±10℃ on a cooling bed. The control of the final rolling temperature and the slow cooling temperature of the stack plays a role in controlling the ferrite grain size and removing residual stress in the steel. The density of lattice defects is reduced, which to some extent reduces the scattering effect of electron transport during conduction and improves the conductivity of the electrode flat steel.

[0040] The appearance and performance of the product of this invention are inspected as follows: the bending degree of the electrode flat steel is ≤3.0mm when measured with a single-size feeler gauge, the width and height of the electrode flat steel are ±2.0mm, the surface quality of the electrode flat steel is good, no surface cracks or defects are observed, the microstructure is 100% ferrite, the ferrite grain size is 4 to 6, and the room temperature resistivity of the electrode flat steel is ≤11.0μΩ·cm.

[0041] The present invention also provides an ultra-low carbon and low manganese-sulfur ratio electrode flat steel, which is rolled by the method mentioned in the above technical solution.

[0042] The ultra-low carbon, low manganese, and low sulfur ratio electrode flat steel is composed of the following components by weight percentage:

[0043] C≤0.005%, Si≤0.010%, Mn≤0.03%, P≤0.012%, S 0.006%~0.012%, Als 0.005%~0.020%, with the remainder being Fe and other unavoidable impurities.

[0044] The mass ratio of Mn to S ranges from 2.0 to 5.0.

[0045] The ultra-low carbon electrode flat steel described in this invention is YT2 electrode flat steel.

[0046] The present invention will be described in detail below with reference to the embodiments.

[0047] Example 1

[0048] The 150mm×170mm ultra-low carbon YT2 electrode flat steel was prepared using the technology of this invention. The production process is as follows: slab cutting—cutting and finishing of square billets—square billet heating—high-pressure water descaling—rolling—online straightening—multiple length cutting—cooling on a cooling bed—stacking and slow cooling.

[0049] The chemical composition of ultra-low carbon YT2 electrode flat steel is as follows: C = 0.005%, Si = 0.006%, Mn = 0.02%, P = 0.005%, S = 0.012%, Als = 0.005%, with the remainder being Fe and other unavoidable impurities, and Mn / S = 2.0.

[0050] Using 220mm×1240mm cross-section ultra-low carbon slabs as raw materials for YT2 electrode flat steel production, the continuously cast slabs are flame-cut into three 220mm×410mm cross-section square billets. After cutting, the cut surfaces are cleaned and ground to remove slag and cutting nodules. The width loss of the cutting seam is 5mm. The square billets are heated in a walking beam furnace, descaled by high-pressure water, and rolled in 15 passes to produce electrode flat steel with a specification of 150mm×170mm.

[0051] The actual heating process for cutting the square billet is as follows: the first heating burner is turned off, the second heating temperature is 980℃±10℃, the third heating temperature is 1040℃±10℃, the soaking zone temperature is 1020℃±10℃, and the total heating time in the furnace is 235 minutes, of which the soaking zone time is 80 minutes; the hot billet is descaled by high-pressure water, and the temperature of the hot billet after descaling is 940℃±10℃; the initial rolling temperature is 910℃±10℃; the last rolling pass is straightened and leveled online by the UR rolling mill, and the exit temperature is 850℃±10℃; then the rolled material is processed into 3-length electrode flat bars using a hot saw, and cooled to 350℃±10℃ on a cooling bed; the 3-length electrode flat bars are transported to the flat stacking area by crane and stacked and cooled to room temperature.

[0052] Example 2

[0053] The 150mm×170mm ultra-low carbon YT2 electrode flat steel was prepared using the technology of this invention. The production process is as follows: slab cutting—cutting and finishing of square billets—square billet heating—high-pressure water descaling—rolling—online straightening—multiple length cutting—cooling on a cooling bed—stacking and slow cooling.

[0054] The chemical composition of ultra-low carbon YT2 electrode flat steel is as follows: C = 0.003%, Si = 0.001%, Mn = 0.03%, P = 0.006%, S = 0.006%, Als = 0.012%, with the remainder being Fe and other unavoidable impurities, and Mn / S = 5.0.

[0055] Using 200mm×1030mm cross-section ultra-low carbon slabs as raw materials for YT2 electrode flat steel production, the continuously cast slabs are flame-cut into three 200mm×340mm cross-section square billets. After cutting, the cut surfaces are cleaned and ground to remove slag and cutting nodules. The width loss of the cutting seam is 4mm. The square billets are then heated in a walking beam furnace, descaled with high-pressure water, and rolled in 15 passes to produce 150mm×170mm electrode flat steel.

[0056] The actual heating process for cutting the square billet is as follows: the first heating burner is turned off, the second heating temperature is 980℃±10℃, the third heating temperature is 1040℃±10℃, the soaking zone temperature is 1020℃±10℃, and the total heating time in the furnace is 220 minutes, of which the soaking zone time is 85 minutes; the hot billet is descaled by high-pressure water, and the temperature of the hot billet after descaling is 930℃±10℃; the initial rolling temperature is 900℃±10℃; the last rolling pass is sizing and straightened online by the UR rolling mill, and the exit temperature is 840℃±10℃; then the rolled material is processed into 3-length electrode flat bars using a hot saw, and cooled to 330℃±10℃ on a cooling bed; the 3-length electrode flat bars are transported to the flat stacking area by crane and stacked and cooled to room temperature.

[0057] Example 3

[0058] The 150mm×170mm ultra-low carbon YT2 electrode flat steel was prepared using the technology of this invention. The production process is as follows: slab cutting—cutting and finishing of square billets—square billet heating—high-pressure water descaling—rolling—online straightening—multiple length cutting—cooling on a cooling bed—stacking and slow cooling.

[0059] The chemical composition of ultra-low carbon YT2 electrode flat steel is as follows: C = 0.002%, Si = 0.004%, Mn = 0.03%, P = 0.004%, S = 0.009%, Als = 0.020%, with the remainder being Fe and other unavoidable impurities, and Mn / S = 3.3.

[0060] Using 200mm×1130mm cross-section ultra-low carbon slabs as raw materials for YT2 electrode flat steel production, the continuously cast slabs are flame-cut into three 200mm×372mm cross-section square billets. After cutting, the cut surfaces are cleaned and ground to remove slag and cutting nodules. The width loss of the cutting seam is 4.5mm. The square billets are then heated in a walking beam furnace, descaled with high-pressure water, and rolled in 15 passes to produce 150mm×170mm electrode flat steel.

[0061] The actual heating process for cutting the square billet is as follows: the first heating burner is turned off, the second heating temperature is 860℃±10℃, the third heating temperature is 940℃±10℃, the soaking zone temperature is 960℃±10℃, and the total heating time in the furnace is 210 minutes, of which the soaking zone time is 60 minutes; the hot billet is descaled by high-pressure water, and the temperature of the hot billet after descaling is 880℃±10℃; the initial rolling temperature is 850℃±10℃; the last rolling pass is straightened and leveled online by the UR rolling mill, and the exit temperature is 800℃±10℃; then the rolled material is processed into 3-length electrode flat bars using a hot saw, and cooled to 250℃±10℃ on a cooling bed; the 3-length electrode flat bars are transported to the flat stacking area by crane and stacked and cooled to room temperature.

[0062] Example 4

[0063] The 150mm×170mm ultra-low carbon YT2 electrode flat steel was prepared using the technology of this invention. The production process is as follows: slab cutting—cutting and finishing of square billets—square billet heating—high-pressure water descaling—rolling—online straightening—multiple length cutting—cooling on a cooling bed—stacking and slow cooling.

[0064] The chemical composition of ultra-low carbon YT2 electrode flat steel is: C = 0.004%, Si = 0.010%, Mn = 0.03%, P = 0.003%, S = 0.010%, Als = 0.010%, with the remainder being Fe and other unavoidable impurities, and Mn / S = 3.0.

[0065] Using 220mm×1180mm cross-section ultra-low carbon slabs as raw materials for YT2 electrode flat steel production, the continuously cast slabs are flame-cut into three 220mm×390mm cross-section square billets. After cutting, the cut surfaces are cleaned and ground to remove slag and cutting nodules. The width loss of the cutting seam is 5.0mm. The square billets are then heated in a walking beam furnace, descaled with high-pressure water, and rolled in 15 passes to produce 150mm×170mm electrode flat steel.

[0066] The actual heating process for cutting the square billet is as follows: the first heating burner is turned off, the second heating temperature is 920℃±10℃, the third heating temperature is 990℃±10℃, the soaking zone temperature is 990℃±10℃, and the total heating time in the furnace is 200 minutes, of which the soaking zone time is 60 minutes; the hot billet is descaled by high-pressure water, and the temperature of the hot billet after descaling is 910℃±10℃; the initial rolling temperature is 880℃±10℃; the last rolling pass is sizing and straightened online by the UR rolling mill, and the exit temperature is 830℃±10℃; then the rolled material is processed into 3-length electrode flat bars using a hot saw, and cooled to 280℃±10℃ on a cooling bed; the 3-length electrode flat bars are transported to the flat stacking area by crane and stacked and cooled to room temperature.

[0067] Table 1 shows the physical appearance and performance indicators of the electrode flat steel in the embodiments.

[0068]

[0069]

[0070] This invention solves the technical problem of corner cracking in ultra-low carbon steel rolling under low manganese-sulfur ratio conditions by rationally controlling the cutting quality of ultra-low carbon steel slabs and strictly controlling the heating temperature, water descaling temperature, rolling temperature, and stacking temperature of the cut billets. Simultaneously, it yields electrode flat steel with excellent conductivity, applicable to the production of ultra-low carbon electrode flat steel under low manganese-sulfur ratio conditions. This invention resolves the technical problem of corner cracking during rolling under low manganese-sulfur ratio conditions, resulting in uniform microstructure and properties, significantly reduced corner cracking rate, and low resistivity. When applied to the cathode of electrolytic cells in the electrolytic aluminum industry, the product provides excellent conductivity, offering crucial support for low-power production in the electrolytic aluminum industry. Compared to conventional processes, this production technology has lower production costs, easier implementation, and meets the required surface quality and performance, demonstrating high economic efficiency and practicality. It can be promoted in other steel mills with similar tooling conditions for producing this steel grade, showing promising prospects for widespread application.

[0071] The present invention has the following beneficial effects:

[0072] (1) The setting of the heating temperature and heating time of each section ensures that the cut billet is heated evenly at a lower temperature, and there are no obvious black marks on the surface of the billet. It also avoids defects such as overheating, burning, cracking, and perforation.

[0073] (2) High-pressure water descaling is used to remove iron oxide scale on heated billets, so as to avoid iron oxide scale being pressed into the surface of the rolled material during rolling and affecting the surface quality of the electrode flat steel. At the same time, it can improve the service life of the rolls. On the other hand, it can appropriately reduce the temperature of the hot billet during the billet opening process, and connect with the rolling process to open the billet at a lower temperature.

[0074] (3) Controlling the lower initial rolling temperature can effectively ensure that low melting point sulfides do not undergo grain boundary liquefaction, improve the bonding force and deformation coordination between grain boundaries during rolling, thereby preventing the formation of microcracks in the early stage of rolling and the corner cracks formed by the deformation and expansion of microcracks during the rolling process.

[0075] (4) The online straightening capability of the UR mill improves the dimensional accuracy of single-length electrode flat steel and the hit rate of low curvature, and also improves the subsequent stacking slow cooling effect.

[0076] (5) The control of the final rolling temperature and the slow cooling temperature of the stack plays the role of controlling the size of ferrite grains and removing residual stress in the steel. The density of lattice defects is reduced, which to a certain extent reduces the scattering effect of electron transmission when conducting electricity and improves the conductivity of the electrode flat steel.

[0077] (6) The YT2 electrode flat steel produced by the above method and principle has solved the problem of rolling cracking in the "red brittle" temperature range. It has good forming performance, excellent surface quality, and low resistivity. It can play a good conductive role when used as the cathode of the electrolytic aluminum cell.

[0078] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0079] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for rolling ultra-low carbon, low manganese-sulfur ratio electrode flat steel, characterized in that, Includes the following steps: S1. After cutting the slab into square steel, heat it in a walking beam furnace to form hot billets; S2. After the hot billet is descaled by high-pressure water, rolling begins. S3. After the final pass of rolling is straightened online, the rolled material is processed into multi-length electrode flat steel using a hot saw. S4. After cooling the multi-length electrode flat steel on the cooling bed, cool it to room temperature using the stacking cooling method. In step S1, the first burner is turned off during the heating process, the second burner temperature range is 860℃±10℃~980℃±10℃, the third burner temperature range is 940℃±10℃~1040℃±10℃, and the soaking zone temperature range is 960℃±10℃~1020℃±10℃. In step S2, the temperature of the hot billet after dephosphorization is controlled at 880℃±10℃~940℃±10℃; In step S2, the rolling temperature is controlled at 850℃±10℃~910℃±10℃.

2. The rolling forming method for ultra-low carbon, low manganese-sulfur ratio electrode flat steel according to claim 1, characterized in that, In step S1, the total heating time is controlled to be ≥200 min, of which the soaking time is ≥60 min.

3. The rolling forming method for ultra-low carbon, low manganese-sulfur ratio electrode flat steel according to claim 1, characterized in that, In step S3, the online straightening is carried out through a UR mill, and the temperature exiting the UR mill is controlled at 800℃±10℃~850℃±10℃.

4. The rolling forming method for ultra-low carbon, low manganese-sulfur ratio electrode flat steel according to claim 1, characterized in that, In step S4, the multi-length electrode flat steel is cooled to 250±10℃~350℃±10℃ on a cooling bed.

5. A type of ultra-low carbon, low manganese-sulfur ratio electrode flat steel, characterized in that, It is made by using the method described in any one of claims 1-4 above.

6. The ultra-low carbon, low manganese-sulfur ratio electrode flat steel according to claim 5, characterized in that, The ultra-low carbon, low manganese, and low sulfur ratio electrode flat steel is composed of the following components by weight percentage: C≤0.005%, Si≤0.010%, Mn≤0.03%, P≤0.012%, S 0.006%~0.012%, Als 0.005%~0.020%, with the remainder being Fe and other unavoidable impurities.

7. The ultra-low carbon, low manganese-sulfur ratio electrode flat steel according to claim 6, characterized in that, The mass ratio of Mn to S ranges from 2.0 to 5.0.

Images