Method for controlling corner transverse cracks of ultra-high carbon steel casting blank

Abstract

The invention relates to a method for controlling corner transverse cracks of an ultra-high carbon steel casting blank, and belongs to the technical field of steel preparation. The specific water flow for cooling fan-shaped sections of casting blanks with different chemical components is optimized, specifically, when Alt in the casting blanks is larger than or equal to 0.020%, the specific water flow W is controlled to meet the condition that W is larger than 0.6 L / kg and smaller than 0.83 L / kg; when Alt in the casting blank is smaller than 0.020%, fan-shaped section cooling is divided into two sections, the first specific water flow w1 and the second specific water flow w2 meet the conditions that w1 is larger than w2, and w1 + w2 is 0.8 L / kg-0. 9 L / kg, the occurrence of corner transverse cracks of the ultra-high carbon steel casting blank with the carbon content larger than or equal to 1.0% can be reduced, periodic liquid level fluctuation of a crystallizer can be effectively restrained, and the casting quality is improved. And the yield of the ultra-high carbon steel casting blank with the carbon content larger than or equal to 1.0% can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of steel material preparation, and in particular to a method for controlling transverse cracks at corners of ultra-high carbon steel ingots. Background Art

[0002] Ultra-high carbon steel and alloy steel with a carbon content ≥1.0% are highly crack-sensitive. When the ingot is cooled in the fan-shaped section, transverse cracks are easily generated at the corners. As the ingot temperature decreases, the width and depth of the transverse cracks further increase. Affected by the easy fracture characteristics of ultra-high carbon steel ingots in a cold environment, transverse crack defects cannot be cleaned offline. After transverse cracks at the corners occur, they cannot be repaired and can only be scrapped, affecting the yield rate of the ingot and causing a great impact on production costs. Summary of the invention

[0003] The present application provides a method for controlling transverse cracks at the corners of ultra-high carbon steel ingots, so as to improve the yield rate of ultra-high carbon steel ingots with a carbon content of ≥1.0%.

[0004] The present application provides a method for controlling transverse cracks at the corners of ultra-high carbon steel ingots, the method comprising:

[0005] Obtaining a cast billet, wherein the mass percentage of C in the cast billet is ≥ 1.0%;

[0006] The specific water amount for cooling the ingot is controlled, and the control meets the following requirements:

[0007] When the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.6L / kg<W<0.83L / kg;

[0008] When the mass proportion of Alt in the ingot is less than 0.020%, the water specific amount includes a first water specific amount and a second water specific amount, and the first water specific amount w1 and the second water specific amount w2 satisfy: w1>w2, w1+w2=0.8L / kg~0.9L / k, and the order in which the ingot undergoes cooling with the first water specific amount and the second water specific amount is: first undergo cooling with the first water specific amount, and then undergo cooling with the second water specific amount.

[0009] As an optional implementation manner, when the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.7L / kg≤W≤0.80L / kg.

[0010] As an optional implementation manner, when the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.7L / kg≤W≤0.75L / kg.

[0011] As an optional implementation, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water amount w1 and the second specific water amount w2 satisfy: w1-w2≥0.15L / kg.

[0012] As an optional implementation manner, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water amount w1 and the second specific water amount w2 satisfy: w1-w2≥0.45L / kg.

[0013] As an optional implementation manner, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water content w1 is ≥ 0.5 L / kg, and the second specific water content w2 is ≤ 0.33 L / kg.

[0014] As an optional implementation manner, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water content w1 is ≥ 0.66 L / kg, and the second specific water content w2 is ≤ 0.17 L / kg.

[0015] As an optional embodiment, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water amount is the specific water amount for cooling the ingot in the mushy zone, and the second specific water amount is the specific water amount for cooling the ingot after passing through the mushy zone.

[0016] As an optional implementation, when the mass proportion of Alt in the ingot is less than 0.020%, along the transportation direction of the ingot, the switching position of the first specific water volume and the second specific water volume is 9m to 11m from the end of the fan-shaped segment as the starting position.

[0017] As an optional implementation manner, the switching position between the first specific water volume and the second specific water volume is 9.5m to 10.5m with the end of the sector as the starting position.

[0018] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0019] The method provided in the embodiment of the present application optimizes the specific water amount of the cooling of the fan-shaped segments of the ingots with different chemical compositions, specifically, when Alt in the ingot ≥ 0.020%, the specific water amount W is controlled to satisfy: 0.6L / kg<W<0.83L / kg; when Alt in the ingot is < 0.020%, the fan-shaped segment cooling is divided into two cooling stages, wherein the first specific water amount w1 and the second specific water amount w2 satisfy: w1>w2, w1+w2=0.8L / kg~0.9L / kg, which can reduce the occurrence of transverse cracks at the corners of ultra-high carbon steel ingots with a carbon content ≥ 1.0%, and can effectively suppress the periodic liquid level fluctuation of the crystallizer, thereby improving the yield rate of ultra-high carbon steel ingots with a carbon content ≥ 1.0%. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 A flowchart of the method provided in the embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0024] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0025] Ultra-high carbon steel and alloy steel with carbon content ≥1.0% are highly crack-sensitive. When the ingot is cooled in the fan-shaped section, it is easy to produce transverse cracks at the corners (such as Figure 1 As shown), and as the temperature of the ingot decreases, the width and depth of the transverse cracks further increase. For example: in the production process of ultra-high carbon steel and its alloy steel (C content ≥1%), a specific water volume of 0.83L / kg is used. When the casting width is less than 1100mm, transverse cracks will occur at the corners of the ingot, with a crack depth of 5-30mm and a width of 2-10mm. In order to study the cause of the crack, when the specific water volume is 0.83L / kg, the temperature of the corner of the ingot is tracked. After the straightening section, the temperature of the corner of the ingot is 680-690℃. The temperature of the corner of the ingot is low. It is believed that the specific water volume of the secondary cooling water is large, the cooling is too strong, and the ingot is subjected to mechanical stress during the bending and straightening process, forming transverse cracks at the corners. The depth and width of the transverse crack defect are large, and this type of steel is prone to breakage in the low temperature state. In the high temperature state, it is impossible to use the means of chamfering the ingot to eliminate defects. The ingot is judged to be scrapped, which has a great impact on the production cost.

[0026] At the same time, the applicant found that when the steel grade Alt is less than 0.020%, periodic crystallizer liquid level fluctuation occurs in the cooling mode of 0.83L / kg specific water volume, and it is judged that 0.83L / kg specific water volume is weak for cooling ultra-high carbon and its alloy steel with Alt less than 0.020%, indicating that the Alt content has a certain influence on the high temperature strength of ultra-high carbon and its alloy steel. In order to improve the periodic liquid level fluctuation of this type of steel, it is necessary to increase the secondary cooling water specific water volume, but with the increase of the secondary cooling water specific water volume, the temperature of the corner of the ingot is further reduced, which is not conducive to the control of the generation of transverse cracks at the corner of the ingot.

[0027] To this end, the present application intends to provide a cooling process for ultra-high carbon steel ingots with different compositions, so as to improve the yield rate of ultra-high carbon steel ingots with a carbon content ≥ 1.0%.

[0028] Figure 1 A flow chart of the method provided in the embodiment of the present application is as follows: Figure 1 As shown, the embodiment of the present application provides a method for controlling transverse cracks at the corners of ultra-high carbon steel ingots, the method comprising:

[0029] S1. Obtaining a cast billet, wherein the mass percentage of C in the cast billet is ≥ 1.0%;

[0030] First, it is necessary to obtain an ultra-high carbon steel ingot with a carbon content ≥ 1.0%.

[0031] S2. Control the specific water amount of the billet cooling, and the control meets the following requirements:

[0032] When the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.6L / kg<W<0.83L / kg;

[0033] When the mass proportion of Alt in the ingot is less than 0.020%, the water specific amount includes a first water specific amount and a second water specific amount, and the first water specific amount w1 and the second water specific amount w2 satisfy: w1>w2, w1+w2=0.8L / kg~0.9L / k, and the order in which the ingot undergoes cooling with the first water specific amount and the second water specific amount is: first undergo cooling with the first water specific amount, and then undergo cooling with the second water specific amount.

[0034] The chemical composition of the ingot is analyzed, especially the content of Alt (acid-soluble aluminum). The content of Alt will directly affect the control of the subsequent cooling water ratio. Control the cooling water ratio:

[0035] When the mass proportion of Alt in the ingot is ≥0.020%, the water content W in the cooling process is controlled between 0.6L / kg and 0.83L / kg. This range of water content helps to reduce the internal stress and thermal cracks generated in the ingot during the cooling process.

[0036] When the mass proportion of Alt in the ingot is less than 0.020%, the cooling process is divided into two stages, namely the first water ratio w1 and the second water ratio w2. The first water ratio w1 is controlled to be greater than the second water ratio w2, and the sum of the two w1+w2 is between 0.8L / kg and 0.9L / kg. The ingot first undergoes cooling with the first water ratio, and then undergoes cooling with the second water ratio. This segmented cooling method can more effectively reduce the incidence of transverse cracks in the corners of the ingot.

[0037] In some embodiments, when the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.7L / kg≤W≤0.80L / kg.

[0038] Furthermore, when the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.7L / kg≤W≤0.75L / kg.

[0039] In some embodiments, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water amount w1 and the second specific water amount w2 satisfy: w1-w2≥0.15L / kg.

[0040] Furthermore, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water amount w1 and the second specific water amount w2 satisfy: w1-w2≥0.45L / kg.

[0041] In some embodiments, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water content w1 is greater than or equal to 0.5 L / kg, and the second specific water content w2 is less than or equal to 0.33 L / kg.

[0042] Furthermore, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water content w1 is ≥ 0.66 L / kg, and the second specific water content w2 is ≤ 0.17 L / kg.

[0043] In some embodiments, when the mass proportion of Alt in the ingot is less than 0.020%, the first specific water amount is the specific water amount for cooling the ingot in the mushy zone, and the second specific water amount is the specific water amount for cooling the ingot after passing through the mushy zone.

[0044] Furthermore, when the mass proportion of Alt in the ingot is less than 0.020%, along the transportation direction of the ingot, the switching position of the first specific water volume and the second specific water volume is 9m to 11m from the end of the fan-shaped segment as the starting position.

[0045] Furthermore, the switching position of the first specific water volume and the second specific water volume is 9.5m to 10.5m from the end of the fan-shaped segment as the starting position.

[0046] In summary, the embodiment of the application provides a method for controlling transverse cracks at the corners of ultra-high carbon steel ingots, which has the following advantages:

[0047] Reducing the incidence of transverse cracks: By precisely controlling the specific water amount during the cooling process, this method can significantly reduce the incidence of transverse cracks at the corners of ultra-high carbon steel ingots.

[0048] Improved yield rate: Since the occurrence of transverse cracks is reduced, the scrap rate of the ingot in the subsequent processing will be reduced, thereby improving the yield rate.

[0049] Improve production efficiency: This method is simple and easy to implement, and can achieve significant technical effects without large-scale transformation of existing production equipment.

[0050] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0051] In order to study the cooling process of ultra-high carbon steel ingots with Alt mass proportion ≥0.020% in the ingot, the cooling process of the ingots with the composition by mass fraction: C: 1.05%, Si: 0.3%, Mn: 0.65%, Alt: 0.035% was studied below.

[0052] Comparative Example 1

[0053] A method for controlling transverse cracks at corners of ultra-high carbon steel ingots, the method comprising:

[0054] S1. Obtaining a cast billet;

[0055] S2. Control the specific water volume of the ingot cooling, and the control meets the following requirements: the specific water volume W is 0.83L / kg.

[0056] Example 1

[0057] A method for controlling transverse cracks at corners of ultra-high carbon steel ingots, the method comprising:

[0058] S1. Obtaining a cast billet;

[0059] S2. Control the specific water volume of the ingot cooling, and the control meets the following requirements: the specific water volume W is 0.80L / kg.

[0060] Example 2

[0061] A method for controlling transverse cracks at corners of ultra-high carbon steel ingots, the method comprising:

[0062] S1. Obtaining a cast billet;

[0063] S2. Control the specific water volume of the ingot cooling, and the control meets the following requirements: the specific water volume W is 0.75L / kg.

[0064] Example 3

[0065] A method for controlling transverse cracks at corners of ultra-high carbon steel ingots, the method comprising:

[0066] S1. Obtaining a cast billet;

[0067] S2. Control the specific water volume of the ingot cooling, and the control meets the following requirements: the specific water volume W is 0.70L / kg.

[0068] Comparative Example 2

[0069] A method for controlling transverse cracks at corners of ultra-high carbon steel ingots, the method comprising:

[0070] S1. Obtaining a cast billet;

[0071] S2. Control the specific water volume of the ingot cooling, and the control meets the following requirements: the specific water volume W is 0.60L / kg.

[0072] The cooling process of Examples 1 to 3 and Comparative Examples 1 to 2 and the crack conditions and corner temperatures of the final ingots are as follows:

[0073]

[0074] From the table above, it can be seen that when the water ratio is reduced to 0.70L / kg, the transverse cracks at the corners of the ingot disappear. When the secondary cooling water ratio reaches 0.6L / kg, the crystallizer liquid level fluctuation shows an increasing trend. This shows that the use of a secondary cooling water ratio of 0.70L / kg is more effective in improving the transverse cracks at the corners of ultra-high carbon and alloy steel ingots with Alt ≥ 0.020%. Compared with the original process, the secondary cooling water ratio is reduced by 0.13L / kg, and the temperature of the ingot corner is increased by 60℃.

[0075] It can be seen from the above table that the method provided in the embodiment of the present application can improve the yield rate of ingots with a C mass ratio ≥1.0% and an Alt mass ratio ≥0.020%, control the crack incidence rate below 54%, and control the crystallizer liquid level fluctuation.

[0076] In order to study the cooling process of ultra-high carbon steel ingots in which the mass proportion of Alt in the ingot is less than 0.020%, the cooling process of the ingots with the mass fraction composition of C: 1.05%, Si: 0.3%, Mn: 0.65%, and Alt: 0.008% was studied below.

[0077] Example 4

[0078] A method for controlling transverse cracks at corners of ultra-high carbon steel ingots, the method comprising:

[0079] S1. Obtaining a cast billet;

[0080] S2. Control the water specific amount for cooling the ingot, and the control meets the following requirements: the water specific amount includes a first water specific amount and a second water specific amount, and the first water specific amount w1 and the second water specific amount w2 meet the following conditions: w1>w2, w1+w2=0.83L / kg, w1=0.5L / kg, w2=0.33L / kg, and the order in which the ingot undergoes cooling with the first water specific amount and the second water specific amount is: first undergo cooling with the first water specific amount, and then undergo cooling with the second water specific amount, and along the transportation direction of the ingot, the switching position of the first water specific amount and the second water specific amount is 10m from the end of the fan segment as the starting position.

[0081] Example 5

[0082] A method for controlling transverse cracks at corners of ultra-high carbon steel ingots, the method comprising:

[0083] S1. Obtaining a cast billet;

[0084] S2. Control the water specific amount for cooling the ingot, and the control meets the following requirements: the water specific amount includes a first water specific amount and a second water specific amount, and the first water specific amount w1 and the second water specific amount w2 meet the following conditions: w1>w2, w1+w2=0.83L / kg, w1=0.66L / kg, w2=0.17L / kg, and the order in which the ingot undergoes cooling with the first water specific amount and the second water specific amount is: first undergo cooling with the first water specific amount, and then undergo cooling with the second water specific amount, and along the transportation direction of the ingot, the switching position of the first water specific amount and the second water specific amount is 10m from the end of the fan segment as the starting position.

[0085] Comparative Example 3

[0086] A method for controlling transverse cracks at corners of ultra-high carbon steel ingots, the method comprising:

[0087] S1. Obtaining a cast billet;

[0088] S2. Control the specific water volume of the ingot cooling, and the control meets the following requirements: the specific water volume W is 0.83L / kg.

[0089] The cooling process of Examples 4 to 5 and Comparative Example 3 and the crack conditions and corner temperatures of the final ingots are as follows:

[0090]

[0091] As can be seen from the above table, the method provided in the embodiment of the present application is adopted to redistribute the secondary cooling water flow rate in each zone, that is, to increase the secondary cooling water flow rate before the mushy zone, thereby increasing the thickness of the billet shell, enhancing the ability to resist the static pressure of molten steel, and eliminating the periodic liquid level fluctuation of the crystallizer. After the mushy zone, the secondary cooling water flow rate is reduced to reduce the cooling intensity, so that the billet is warmed up, the temperature of the billet corner is increased, and the generation of transverse cracks is avoided.

[0092] Compared with Comparative Example 3, under the condition of unchanged secondary cooling water specific water volume of 0.83L / kg, by adjusting the surface temperature of the billet in the secondary automatic water distribution model, the cooling of the fan-shaped billet is divided into two sections for control. When the billet length of the fan-shaped segment is ≤10m, the specific water volume is increased, the billet shell thickness is increased, the ability of the billet shell to resist the static pressure of molten steel is improved, and the periodic liquid level fluctuation of the crystallizer is alleviated. When the fan-shaped segment length is greater than 10m, the specific water volume is reduced, the billet is warmed up to increase the temperature of the billet corner, and the transverse crack defect at the billet corner is solved. After optimizing the specific water volume distribution, the periodic liquid level fluctuation of the crystallizer is significantly improved, and there is no transverse crack at the billet corner.

[0093] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0094] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e. a and b), ac, bc, or abc, where a, b and c can be single or multiple, respectively.

[0095] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for controlling transverse cracks at the corners of ultra-high carbon steel ingots, characterized in that: The method comprises: Obtaining a cast billet, wherein the mass percentage of C in the cast billet is ≥ 1.0%; The specific water amount for cooling the ingot is controlled, and the control meets the following requirements: When the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.6L / kg<W<0.83L / kg; When the mass proportion of Alt in the ingot is less than 0.020%, the water specific amount includes a first water specific amount and a second water specific amount, and the first water specific amount w1 and the second water specific amount w2 satisfy: w1>w2, w1+w2=0.8L / kg~0.9L / kg, and the order in which the ingot undergoes cooling with the first water specific amount and the second water specific amount is: first cooling with the first water specific amount, and then cooling with the second water specific amount.

2. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 1, characterized in that: When the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.7L / kg≤W≤0.80L / kg.

3. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 2, characterized in that: When the mass proportion of Alt in the ingot is ≥0.020%, the specific water content W satisfies: 0.7L / kg≤W≤0.75L / kg.

4. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 1, characterized in that: When the mass proportion of Alt in the ingot is less than 0.020%, the first specific water amount w1 and the second specific water amount w2 satisfy: w1-w2≥0.15L / kg.

5. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 4, characterized in that: When the mass proportion of Alt in the ingot is less than 0.020%, the first specific water amount w1 and the second specific water amount w2 satisfy: w1-w2≥0.45L / kg.

6. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 1, characterized in that: When the mass proportion of Alt in the ingot is less than 0.020%, the first specific water content w1 is greater than or equal to 0.5 L / kg, and the second specific water content w2 is less than or equal to 0.33 L / kg.

7. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 6, characterized in that: When the mass proportion of Alt in the ingot is less than 0.020%, the first specific water content w1 is ≥ 0.66 L / kg, and the second specific water content w2 is ≤ 0.17 L / kg.

8. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 1, characterized in that: When the mass proportion of Alt in the ingot is less than 0.020%, the first water ratio is the water ratio for cooling the ingot in the mushy zone, and the second water ratio is the water ratio for cooling the ingot after passing through the mushy zone.

9. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 1, characterized in that: When the mass proportion of Alt in the ingot is less than 0.020%, along the transportation direction of the ingot, the switching position of the first specific water volume and the second specific water volume is 9m to 11m from the end of the fan-shaped segment as the starting position.

10. The method for controlling transverse cracks at corners of ultra-high carbon steel ingots according to claim 9, characterized in that: The switching position between the first specific water volume and the second specific water volume is 9.5 m to 10.5 m from the end of the sector as the starting position.

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