High-pulling-speed continuous casting method for low-carbon high-sulfur steel chamfering crystallizer

Abstract

The invention relates to the technical field of steelmaking continuous casting, and discloses a high-pulling-speed continuous casting method for a low-carbon high-sulfur steel chamfering crystallizer, a chamfering crystallizer continuous casting machine is adopted, and in the casting process, a low-carbon high-sulfur steel casting blank is prepared by controlling the narrow face taper, the narrow face cooling water flow and the casting superheat degree of the chamfering crystallizer. According to the method, the problems that when the low-carbon high-sulfur steel is cast through a chamfering crystallizer continuous casting machine, the narrow face of a casting blank is seriously sunken, and crack defects are prone to occurring can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking continuous casting, in particular to a high-speed continuous casting method for a low-carbon and high-sulfur steel chamfered crystallizer. Background Art

[0002] In the metallurgical industry, the casting process solves the defect of transverse cracks at the corners of the casting by introducing the chamfering crystallizer process. The goal of the chamfering crystallizer technology is to change the original right angle of the casting into two obtuse angles to eliminate the stress concentration at the corners of the casting, while achieving the purpose of increasing the corner temperature. However, in the subsequent use process, it was found that although the chamfering crystallizer solved the transverse cracks of the casting, the chamfering crystallizer was prone to produce longitudinal cracks at the corners of the casting, especially when the crystallizer taper changed more than 0.2% / m, the longitudinal crack rate of the corners of the casting reached 35%, resulting in an increase in the cleaning amount of the casting offline, affecting the inventory of slabs.

[0003] Transverse cracks at the corners of continuous casting slabs have long troubled metallurgical workers, and some existing measures to reduce or eliminate cracks at the corners of continuous casting slabs are achieved by improving the equipment. CN 102909331 B provides a special ingot head for a continuous casting slab chamfering crystallizer, which has achieved mature industrial applications of multiple varieties and specifications, not only eliminating transverse cracks at the corners of continuous casting slabs, but also avoiding defects in longitudinal cracks at the corners. CN 220445010 U provides a side-arc narrow-edge chamfered crystallizer copper plate and continuous casting equipment. The copper plate is provided with a through-steel chamfer to solve the problem of cracks at the corners of the full-arc continuous casting slab. CN 202146982 U provides a narrow-face copper plate of a chamfered crystallizer with a combined cooling water channel. The combined cooling water channel inside the chamfer can control crack defects at the corners of micro-alloyed steel grades, which is beneficial to extending the service life of the narrow-face copper plate. CN 104209484 B provides a narrow copper plate of a chamfered crystallizer, which effectively controls defects at the corners of the ingot, and solves the problem that the arc chamfer of the transition surface is small in the prior art, which results in a limited increase in the temperature at the corners of the ingot, fails to fully solve the heat transfer problem, causes more longitudinal cracks in the ingot, and even steel leakage accidents, resulting in poor practical application effects of the chamfered crystallizer. CN203380340 U provides a narrow copper plate of a chamfered crystallizer for slab continuous casting, which can avoid crack defects at the corners of the ingot and extend the service life of the narrow copper plate. CN 204321126 U provides a narrow copper plate of a chamfered crystallizer, wherein a reverse taper is added to the upper portion of the copper plate to avoid the formation of a gap between the billet shell and the copper plate, so that the billet shell and the copper plate maintain good contact, and the temperature of the corner of the continuous casting billet in the straightening zone is increased by changing the heat transfer state of the corner, thereby suppressing the stress concentration at the corner of the right-angle continuous casting billet during bending and straightening, thereby eliminating not only the defects of cracks at the corner of the continuous casting billet, but also the defects such as warping and fine lines at the edge of the copper plate after rolling. CN105057613 B provides a narrow copper plate of a chamfered crystallizer for slab continuous casting, which can ensure the chamfering cooling effect and avoid cracks at the corner of the casting billet. CN 102642000 A provides a narrow copper plate of a chamfered crystallizer for slab continuous casting that effectively controls longitudinal cracks at the corners, and through the taper compensation design of the chamfered surface of the narrow copper plate, the formation of gaps on the chamfered surface due to the large shrinkage of the wide billet shell is avoided, and the occurrence of longitudinal cracks at the corners and the steel leakage accidents caused thereby are avoided. CN 105195692 A provides a chamfered crystallizer narrow copper plate, which can ensure the chamfering cooling effect and avoid cracks at the corners of the ingot. CN 203778719 U discloses a chamfered crystallizer narrow copper plate with an asymmetric structure, which controls the transverse crack defects at the outer arc corner by increasing the chamfer amount of the narrow copper plate close to the outer arc. CN102728795 A provides a combined slab continuous casting chamfered crystallizer narrow copper plate, which increases the chamfer of the chamfered copper plate in the upper part of the crystallizer through the variable taper design in the height direction of the narrow copper plate, so that the ingot shell grows more evenly at the chamfered surface, avoiding the occurrence of longitudinal cracks at the corners and the steel leakage accidents caused by them.CN 205096502 U provides a narrow copper plate of a slab continuous casting chamfering crystallizer, which can ensure the cooling effect of the chamfering and avoid cracks at the corners of the casting. CN 102328037 A provides a continuous casting slab chamfering crystallizer with a self-contained taper. The narrow surface of the crystallizer has a self-contained taper chamfering structure. The self-contained taper better adapts to the solidification shrinkage characteristics of molten steel and provides sufficient support for the chamfered part, thereby eliminating corner defects of the continuous casting slab. CN105964958 A provides a gradual curvature oblique long chamfering crystallizer and a design method thereof. Through the gradual curvature of the chamfered surface and the water cooling design, the air gap between the crystallizer and the casting is fully compensated, thereby effectively improving the heat transfer efficiency of the chamfered surface, refining the grains of the chamfered surface, inhibiting the chain precipitation of microalloy carbon and nitrides such as niobium, vanadium, and titanium at the grain boundary, improving the hot plasticity of the corner, and inhibiting the generation of corner crack defects. CN 202052915 U provides a chamfered crystallizer narrow copper plate for thin slab continuous casting. The corners of the cast thin slab are changed from the original right-angle shape to a rounded angle transition type. The temperature of the corners of the casting billet is higher, the stress during bending and straightening is smaller, and the occurrence of transverse cracks at the casting billet corners can be effectively suppressed.

[0004] Some existing measures to reduce or eliminate cracks at the corners of continuous casting slabs are achieved by improving the process. CN116751922 A provides a method for reducing the generation of longitudinal cracks at the corners of high-carbon steel castings produced by chamfering crystallizers, by controlling the sulfur content of refined molten steel to ≤0.005%, the carbon content of converter molten steel and the target carbon content of high-carbon steel to ≤0.15%; and when the refined molten steel is continuously cast in the chamfering crystallizer, the actual back taper value of the chamfering crystallizer is regulated to be equal to the theoretical back taper value corresponding to the casting section width in the continuous casting crystallizer back taper table + 0.5 to 2 mm; the billet drawing speed is 0.8 to 1.1 m / min, which greatly reduces the generation of longitudinal cracks at the corners of high-carbon steel castings produced by the chamfering crystallizer.

[0005] Enamel steel is a new type of material widely used in building interior and exterior walls, tunnel decorative panels, subway decorative panels, shopping mall elevators, landscape paintings and other places. At present, a new type of steel with a carbon content of 0.0020-0.0050% and a sulfur content of 0.020-0.035% has been developed. It has the advantages of good adhesion, excellent formability, heat resistance, and corrosion resistance. However, due to the high sulfur content in molten steel and strong crack sensitivity, when casting with a chamfered crystallizer continuous casting machine, the narrow surface of the ingot is severely concave, and crack defects are prone to occur, and even crack leakage accidents may occur.

[0006] Based on this, there is room for improvement in the continuous casting of low-carbon high-sulfur steel chamfered crystallizers. Summary of the invention

[0007] In view of this, the present invention provides a high-speed continuous casting method for low-carbon and high-sulfur steel using a chamfered crystallizer to solve the problem that the narrow surface of the ingot is severely concave and prone to crack defects when low-carbon and high-sulfur steel is cast using a chamfered crystallizer continuous casting machine.

[0008] The present invention provides a high-speed continuous casting method for low-carbon high-sulfur steel using a chamfered crystallizer, comprising: using a chamfered crystallizer continuous casting machine, and during the casting process, controlling the narrow surface taper of the chamfered crystallizer, the narrow surface cooling water flow rate, and the casting superheat to prepare a low-carbon high-sulfur steel ingot.

[0009] In some embodiments, for a continuous casting billet with a cross-sectional size of 1300-1930 mm×230-250 mm, the narrow surface taper of the chamfered crystallizer is controlled to be 1.05% to 1.15%.

[0010] In some embodiments, the cooling water flow rate of the narrow surface of the chamfered crystallizer is controlled to be 545 L / min to 555 L / min.

[0011] In some embodiments, the casting superheat is controlled to be 20°C to 45°C.

[0012] In some embodiments, the method further includes controlling the pulling speed according to the casting superheat.

[0013] In some embodiments, controlling the casting speed according to the casting superheat comprises: When the casting superheat is less than or equal to 25℃, the pulling speed is controlled to be greater than 0.90m / min and less than or equal to 1.30m / min; When the casting superheat is greater than 25°C and less than or equal to 35°C, the pulling speed is controlled to be greater than 0.80m / min and less than or equal to 0.90m / min; When the casting superheat is greater than 35°C and less than or equal to 45°C, the pulling speed is controlled to be greater than 0.70m / min and less than or equal to 0.80m / min; When the casting superheat is greater than 45°C, the pulling speed is controlled to be greater than 0.60 m / min and less than or equal to 0.70 m / min.

[0014] In some embodiments, the narrow surface taper of the chamfered crystallizer is controlled to be 1.10%.

[0015] In some embodiments, the cooling water flow rate of the narrow surface of the chamfered crystallizer is controlled to be 550 L / min.

[0016] In some embodiments, the carbon content in the low carbon high sulfur steel ingot is controlled to be 0.0020%-0.0050%.

[0017] In some embodiments, the sulfur content in the low carbon high sulfur steel ingot is controlled to be 0.020%-0.035%. Beneficial effects of the present invention: The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer of the present invention ensures smooth continuous casting production, can increase the casting speed of the chamfered crystallizer continuous casting machine by controlling the casting superheat, and reduce the labor intensity of workers. The steel with a carbon content of 0.0020% to 0.0050% and a sulfur content of 0.020% to 0.035% is prepared, and not only all indicators meet expectations, but also it is suitable for enameled steel. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with specific embodiments.

[0019] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0020] The invention discloses a high-speed continuous casting method for low-carbon high-sulfur steel chamfered crystallizer, which adopts a chamfered crystallizer continuous casting machine. During the casting process, the narrow surface taper of the chamfered crystallizer, the narrow surface cooling water flow rate and the casting superheat are controlled to prepare low-carbon high-sulfur steel ingots. The method according to the invention is applicable to low-carbon high-sulfur steel with a carbon content of less than 0.0050% and a sulfur content of more than 0.020%, and is particularly effective for enameled steel with a carbon content of 0.0020% to 0.0050% and a sulfur content of 0.020% to 0.035%.

[0021] The narrow surface taper of the crystallizer refers to the inner wall of the narrow surface of the crystallizer with a certain inclination angle from the upper mouth to the lower mouth. The setting of this inclination angle can improve the contact state between the billet and the wall of the crystallizer, reduce the formation of air gaps, and facilitate heat transfer, thereby improving the quality of the billet; and prevent the billet from sticking to the wall of the crystallizer during the solidification process, so as to facilitate the billet to be pulled out of the crystallizer smoothly. When the narrow surface taper is too large, the billet will be subjected to large uneven mechanical stress, which is easy to produce cracks on the surface of the billet, or cause uneven shrinkage between the narrow surface and the wide surface of the billet, thereby causing the surface quality of the billet to deteriorate; at the same time, too large a taper will increase the friction between the narrow surface of the crystallizer and the billet, which will not only increase the resistance to billet drawing, but also accelerate the wear of the narrow surface of the crystallizer and reduce the service life of the crystallizer; and due to the increase in the resistance to billet drawing, in order to ensure that the billet can be pulled out of the crystallizer smoothly, the continuous casting machine needs to consume more energy, thereby increasing the production cost. When the narrow surface taper is too small, the air gap between the billet and the wall of the crystallizer will increase during the solidification process, and the heat transfer effect will deteriorate. This may cause uneven shrinkage of the billet during cooling, increasing the risk of the billet falling out of square; and the friction between the billet and the narrow surface of the crystallizer is reduced, which makes it easy for the billet to stick to the crystallizer during the billet drawing process. In some embodiments of the present invention, for low-carbon high-sulfur steel with a carbon content of less than 0.0050% and a sulfur content of more than 0.020%, when using a chamfered crystallizer to continuously cast a continuous casting billet with a cross-sectional size of 1300-1930mm×230-250mm at a high drawing speed, the narrow surface taper of the chamfered crystallizer may be controlled to 1.05% to 1.15%. Those skilled in the art can change the narrow surface taper by mechanical means such as adjusting the clamping device or gasket of the narrow surface of the crystallizer, or use a hydraulic system to control the movement of the narrow surface of the crystallizer to adjust the narrow surface taper.

[0022] In some embodiments, a high-speed continuous casting method for a low-carbon, high-sulfur steel chamfered crystallizer includes controlling the cooling water flow rate of the narrow surface of the chamfered crystallizer to be 545 L / min to 555 L / min.

[0023] Superheat refers to the difference between the pouring temperature of liquid metal and the temperature at which it begins to solidify. If the superheat is too low, it is easy to cause cold shut and insufficient pouring. If the superheat is too high, it is easy to reduce the surface quality, cause sand inclusion, and produce oxide inclusions and pores.

[0024] In some embodiments, a high-speed continuous casting method for low-carbon and high-sulfur steel using a chamfered crystallizer comprises controlling the casting superheat to be 20°C to 45°C.

[0025] In some embodiments, the casting superheat is controlled to be 20°C to 45°C, including controlling the casting superheat of the molten steel in the tundish to be 20°C to 45°C.

[0026] In some embodiments, the high-speed continuous casting method for low-carbon and high-sulfur steel using a chamfered crystallizer further includes controlling the casting speed according to the casting superheat.

[0027] In some embodiments, controlling the casting speed according to the casting superheat comprises: When the casting superheat is less than or equal to 25℃, the pulling speed is controlled to be greater than 0.90m / min and less than or equal to 1.30m / min; When the casting superheat is greater than 25°C and less than or equal to 35°C, the pulling speed is controlled to be greater than 0.80m / min and less than or equal to 0.90m / min; When the casting superheat is greater than 35°C and less than or equal to 45°C, the pulling speed is controlled to be greater than 0.70m / min and less than or equal to 0.80m / min; When the casting superheat is greater than 45°C, the pulling speed is controlled to be greater than 0.60 m / min and less than or equal to 0.70 m / min.

[0028] In some embodiments, the narrow surface taper of the chamfered crystallizer is controlled to be 1.10%.

[0029] In some embodiments, the cooling water flow rate of the narrow surface of the chamfered crystallizer is controlled to be 550 L / min.

[0030] In some embodiments, the carbon content in the low carbon high sulfur steel ingot is controlled to be 0.0020%-0.0050%.

[0031] In some embodiments, the sulfur content in the low carbon high sulfur steel ingot is controlled to be 0.020%-0.035%.

[0032] In the high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer of the present invention, the control means for the narrow surface taper of the chamfered crystallizer, the narrow surface cooling water flow of the chamfered crystallizer, and the casting superheat are common technical means known to technical personnel in this field, and therefore will not be mentioned in detail.

[0033] Example 1 A steel mill used a chamfered mold continuous casting machine to develop low-carbon and high-sulfur steel using a low-carbon and high-sulfur steel chamfered mold high-speed continuous casting method. The cross-sectional size of the casting continuous casting billet was 1300mm×230mm. During the casting process, the narrow surface taper of the chamfered crystallizer was 1.05%, the narrow surface cooling water flow of the chamfered crystallizer was 555L / min, the casting superheat of the tundish molten steel was 22°C, and the pulling speed was 1.10m / min. The various indicators of the prepared low-carbon and high-sulfur steel billet met expectations. The carbon content of the low-carbon and high-sulfur steel billet was 0.0033%, the sulfur content was 0.025%, and the corners were smooth and flat without cracks and pores.

[0034] Example 2 A steel mill used a chamfered mold continuous casting machine and a high-speed continuous casting method with a low-carbon and high-sulfur steel chamfered mold to develop low-carbon and high-sulfur steel. The cross-sectional size of the casting continuous casting billet was 1520mm×230mm. During the casting process, the narrow surface taper of the chamfered crystallizer was 1.15%, the narrow surface cooling water flow of the chamfered crystallizer was 545L / min, the casting superheat of the molten steel in the middle package was 33°C, and the pulling speed was 0.85m / min. The various indicators of the prepared low-carbon and high-sulfur steel billet met expectations. The carbon content of the low-carbon and high-sulfur steel billet was 0.0041%, the sulfur content was 0.030%, and the corners were smooth and flat without cracks and pores.

[0035] Example 3 A steel mill used a chamfered mold continuous casting machine and a high-speed continuous casting method with a low-carbon and high-sulfur steel chamfered mold to develop low-carbon and high-sulfur steel. The cross-sectional size of the casting continuous casting billet was 1820mm×230mm. During the casting process, the narrow surface taper of the chamfered crystallizer was 1.10%, the narrow surface cooling water flow of the chamfered crystallizer was 550L / min, the casting superheat of the molten steel in the middle package was 28°C, and the pulling speed was 0.87m / min. The various indicators of the prepared low-carbon and high-sulfur steel billet met expectations. The carbon content of the low-carbon and high-sulfur steel billet was 0.0026%, the sulfur content was 0.020%, and the corners were smooth and flat without cracks and pores.

[0036] Example 4 A steel mill used a chamfered mold continuous casting machine and a high-speed continuous casting method with a low-carbon and high-sulfur steel chamfered mold to develop low-carbon and high-sulfur steel. The cross-sectional size of the casting continuous casting billet was 1930mm×250mm. During the casting process, the narrow surface taper of the chamfered crystallizer was 1.15%, the narrow surface cooling water flow of the chamfered crystallizer was 555L / min, the casting superheat of the tundish molten steel was 23°C, and the pulling speed was 1.00m / min. The various indicators of the prepared low-carbon and high-sulfur steel billet met expectations. The carbon content of the low-carbon and high-sulfur steel billet was 0.0037%, the sulfur content was 0.026%, and the corners were smooth and flat without cracks and pores.

[0037] Comparative Example 1 A steel mill used a chamfered mold continuous casting machine to develop low-carbon high-sulfur steel using a low-carbon high-sulfur steel chamfered mold high-speed continuous casting method. The cross-sectional size of the casting continuous casting billet was 1300mm×230mm. During the casting process, the narrow surface taper of the chamfered crystallizer was 1.45%, the narrow surface cooling water flow of the chamfered crystallizer was 480L / min, the casting superheat of the tundish molten steel was 28°C, and the pulling speed was 1.10m / min. The carbon content of the prepared low-carbon high-sulfur steel billet was 0.003%, the sulfur content was 0.020%, the corners were smooth and flat, but there were fine cracks and pores.

[0038] Comparative Example 2 A steel mill used a chamfered mold continuous casting machine and a high-speed continuous casting method with a low-carbon and high-sulfur steel chamfered mold to develop low-carbon and high-sulfur steel. The cross-sectional size of the casting continuous casting billet was 1520mm×230mm. During the casting process, the narrow surface taper of the chamfered crystallizer was 1.30%, the narrow surface cooling water flow of the chamfered crystallizer was 490L / min, the casting superheat of the tundish molten steel was 29°C, and the pulling speed was 0.85m / min. The carbon content of the prepared low-carbon and high-sulfur steel billet was 0.002%, the sulfur content was 0.022%, the corners were smooth and flat, but there were fine cracks and pores.

[0039] The high-speed continuous casting method of the low-carbon and high-sulfur steel chamfered crystallizer of the present invention controls the narrow surface taper of the chamfered crystallizer and the cooling water flow of the narrow surface, and matches the casting superheat and the pulling speed in combination with the narrow surface taper of the chamfered crystallizer and the cooling water flow of the narrow surface, selects the appropriate casting superheat and pulling speed, and strictly controls the casting superheat to maintain the stability of the pulling speed. The method of the present invention not only ensures the smooth production of continuous casting, but also can increase the pulling speed of the chamfered crystallizer continuous casting machine by controlling the casting superheat, thereby reducing the labor intensity of workers. The steel grade with a carbon content of 0.0020% to 0.0050% and a sulfur content of 0.020% to 0.035% prepared by the method of the present invention not only meets the expectations in various indicators, but also eliminates or reduces the occurrence of crack defects on the narrow surface of the ingot, thereby preparing a steel grade suitable for enameled steel. The method of the present invention eliminates or reduces the occurrence of narrow surface cracks of the ingot from a process aspect without changing the equipment hardware, avoids crack leakage accidents, has great adaptability in production and ensures the quality of the prepared steel.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer, characterized in that: include: A chamfered mold continuous casting machine is used to prepare low-carbon high-sulfur steel ingots by controlling the narrow surface taper of the chamfered mold, the narrow surface cooling water flow rate and the casting superheat during the casting process.

2. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 1 is characterized in that: For the continuous casting billet with a cross-sectional size of 1300-1930 mm×230-250 mm, the narrow surface taper of the chamfered crystallizer is controlled to be 1.05% to 1.15%.

3. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 2 is characterized in that: The method comprises controlling the cooling water flow rate of the narrow surface of the chamfered crystallizer to be 545 L / min to 555 L / min.

4. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 3 is characterized in that: Including controlling the casting superheat to 20°C ~ 45°C.

5. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 4 is characterized in that: It also includes controlling the casting speed according to the casting superheat.

6. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 5 is characterized in that: The method of controlling the casting speed according to the casting superheat degree comprises: When the casting superheat is less than or equal to 25°C, the pulling speed is controlled to be greater than 0.90m / min and less than or equal to 1.30m / min; When the casting superheat is greater than 25°C and less than or equal to 35°C, the pulling speed is controlled to be greater than 0.80m / min and less than or equal to 0.90m / min; When the casting superheat is greater than 35°C and less than or equal to 45°C, the pulling speed is controlled to be greater than 0.70m / min and less than or equal to 0.80m / min; When the casting superheat is greater than 45° C., the pulling speed is controlled to be greater than 0.60 m / min and less than or equal to 0.70 m / min.

7. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 2 is characterized in that: The narrow surface taper of the chamfered crystallizer is controlled to be 1.10%.

8. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 3 is characterized in that: The cooling water flow rate of the narrow surface of the chamfered crystallizer is controlled to be 550L / min.

9. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 1, characterized in that: The carbon content in the low-carbon high-sulfur steel ingot is controlled to be 0.0020%-0.0050%.

10. The high-speed continuous casting method for low-carbon and high-sulfur steel chamfered crystallizer according to claim 1, characterized in that: The sulfur content in the low-carbon high-sulfur steel ingot is controlled to be 0.020%-0.035%.