CN110976800A - Method for solving casting blank cracks of high-carbon crack sensitive steel - Google Patents
Method for solving casting blank cracks of high-carbon crack sensitive steel Download PDFInfo
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- CN110976800A CN110976800A CN201911220436.0A CN201911220436A CN110976800A CN 110976800 A CN110976800 A CN 110976800A CN 201911220436 A CN201911220436 A CN 201911220436A CN 110976800 A CN110976800 A CN 110976800A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
The application discloses a method for solving the problem of casting blank cracks of high-carbon crack sensitive steel, wherein a secondary cooling section of a casting machine is divided into four parts, namely a first area, a second area, a third area and a fourth area; the specific water amount of the secondary cooling water is adjusted to 1.3L/kg from the initial 1.4L/kg, and the waste inferior-quality products caused by transverse cracks are reduced while the carbon segregation is not increased; the reduction ratio of water is adjusted by 7.1 percent, and the conclusion is drawn according to experience. Under the condition of 1.3L/kg of specific water, the proportion of cooling water in each zone is adjusted, the proportion of defective products is the lowest when the proportion of one zone to four zones is 34.98%, 42.36%, 12.32% and 10.34%, the proportion of defective products is higher when the proportion of water in the second zone is 33.64%, 43.78%, 12.44% and 10.14%, the defective product is judged according to the surface quality defect grades of the wire rods, the defects comprise scabs, saw teeth, shrinkage cavities and the like, the proportion of defective products corresponding to 32.11%, 46.79%, 11.47% and 9.63% is the highest, and the proportion of defective products is the lowest when the proportion of specific water is 1.3L/kg and the proportion of cold water in the second zone is 34.98%, 42.36%, 12.32% and 10.34%.
Description
Technical Field
The invention belongs to the technical field of converter steelmaking, and particularly relates to a method for solving casting blank cracks of high-carbon crack sensitive steel.
Background
In the production process of small square billet high-carbon steel, in order to control carbon segregation, strong cooling is generally adopted; however, for high carbon steel with higher alloy content, such as 65Mn or steel types SWRH72BCr and SWRH82BCr added with trace strengthening element V, waste products generated by transverse cracks of casting blanks appear according to a water distribution model of carbon steel with the same carbon content, so that a method needs to be found to solve the problem and improve the product yield.
Disclosure of Invention
The technical problem to be solved is as follows: the application mainly provides a method for solving the casting blank cracks of high-carbon crack sensitive steel, and solves the technical problems that waste products are easy to generate due to the adoption of strong cooling in the prior art.
The technical scheme is as follows:
a method for solving casting blank cracks of high-carbon crack sensitive steel comprises the following steps:
the first step is as follows: the cooling section is divided into four parts, namely a first area, a second area, a third area and a fourth area;
the second step is that: the specific water amount of the secondary cooling water is adjusted from 1.4L/kg to 1.3L/kg, and the conclusion is obtained according to an empirical formula when the secondary cooling water is adjusted by 7.1 percent, wherein the waste inferior-quality products caused by transverse cracks are reduced, and the carbon segregation is not increased;
the third step: under the condition of 1.3 liters/kilogram of water, the proportion of cooling water in each zone is adjusted, the proportion of waste and defective products is the lowest when the proportion of one zone to four zones is 34.98%, 42.36%, 12.32% and 10.34%, the proportion of waste and defective products is higher when the proportion of water in the second zone is 33.64%, 43.78%, 12.44% and 10.14%, wherein the proportion of waste and defective products corresponding to 32.11%, 46.79%, 11.47% and 9.63% is the highest, the judgment of the waste and defective products is judged according to the surface quality defect grade of the wire rod, the defects comprise scabs, saw teeth, shrinkage cavities and the like, the surface defects can be observed by naked eyes to find that the surface has obvious defects, carbon segregation is obtained by drilling and sampling low-power samples, and dividing the edge position by the carbon content of the central position;
the fourth step: the lowest waste rate was determined when the specific water amount was 1.3L/kg and the second-zone secondary cooling water ratios were 34.98%, 42.36%, 12.32% and 10.34%.
As a preferred technical scheme of the invention: the proportionality coefficient is M multiplied by the pulling speed, and M is the unit L/M.
As a preferred technical scheme of the invention: the pulling speed is the length of casting steel billets per minute and is unit m.
As a preferred technical scheme of the invention: m is different under the same pulling speed, and the defective rate is different.
As a preferred technical scheme of the invention: and the lowest defective product is achieved by downwards adjusting the value of M.
Has the advantages that: compared with the prior art, the method for solving the casting blank cracks of the high-carbon crack sensitive steel has the following technical effects:
1. finding out specific water quantity which can reduce transverse cracks and ensure carbon segregation;
2. finding out the optimal cooling water proportion of each cooling section under the same proportion of water;
3. under the condition of ensuring that the specific water amount is larger, the generation of transverse cracks of the casting blank is effectively controlled by adjusting the water distribution ratio of each area of the cooling section, and the qualification rate is improved;
4. by tracking and adjusting the surface condition of the blank with specific water, the occurrence rate of transverse cracks on the surface is reduced from 30% to 3%, and the surface defects of the blank are obviously reduced;
5. the low-power pickling result of the blank is tracked, the low-power defect rate pickling result is reduced from the initial 30 percent to the current 1 percent, and the defect rate is obviously reduced.
Detailed Description
Example 1
A method for solving casting blank cracks of high-carbon crack sensitive steel comprises the following steps:
the first step is as follows: the cooling section is divided into four parts, namely a first area, a second area, a third area and a fourth area;
the second step is that: the specific water amount of the secondary cooling water is adjusted from 1.4L/kg to 1.3L/kg, and the conclusion is obtained according to an empirical formula when the secondary cooling water is adjusted by 7.1 percent, wherein the waste inferior-quality products caused by transverse cracks are reduced, and the carbon segregation is not increased;
the third step: under the condition of 1.3L/kg of water, the proportion of cooling water in each zone is adjusted, the proportion of waste and defective products is lowest when the proportion of one zone to four zones is 34.98%, 42.36%, 12.32% and 10.34%, the proportion of waste and defective products corresponding to 32.11%, 46.79%, 11.47% and 9.63% is highest, the judgment of the waste and defective products is judged according to the grade of surface quality defects of the wire rod, the defects comprise scabs, saw teeth, shrinkage cavities and the like, the surface defects can be observed by naked eyes, obvious defects can be found on the surface, carbon segregation is obtained by sampling a low-magnification sample through drilling, and the carbon content at the central position is divided by the edge position to obtain a segregation index;
the fourth step: the lowest waste rate was determined when the specific water amount was 1.3L/kg and the second-zone secondary cooling water ratios were 34.98%, 42.36%, 12.32% and 10.34%.
In this embodiment, the scaling factor M is the pulling rate, and M is the unit L/M.
In this example, the pulling rate is the length of the billet cast per minute in m.
In this example, the pulling rate was different for M and the defective rate was different.
In this embodiment, the minimum number of defective products is achieved by adjusting the value of M downward.
On a billet continuous casting machine, the steel grade No. 70 steel is fixed, and the quantity of defective products is stably reduced to 0.4 percent from the original 1.5 percent after the parameters of a first zone, a second zone, a third zone and a fourth zone are adjusted.
Example 2
A method for solving casting blank cracks of high-carbon crack sensitive steel comprises the following steps:
the first step is as follows: the cooling section is divided into four parts, namely a first area, a second area, a third area and a fourth area;
the second step is that: the specific water amount of the secondary cooling water is adjusted from 1.4L/kg to 1.3L/kg, and the conclusion is obtained according to an empirical formula when the secondary cooling water is adjusted by 7.1 percent, wherein the waste inferior-quality products caused by transverse cracks are reduced, and the carbon segregation is not increased;
the third step: under the condition of 1.3L/kg of water, the proportion of cooling water in each zone is adjusted, the proportion of waste and defective products is lowest when the proportion of one zone to four zones is 34.98%, 42.36%, 12.32% and 10.34%, the proportion of waste and defective products corresponding to 32.11%, 46.79%, 11.47% and 9.63% is highest, the judgment of the waste and defective products is judged according to the grade of surface quality defects of the wire rod, the defects comprise scabs, saw teeth, shrinkage cavities and the like, the surface defects can be observed by naked eyes, obvious defects can be found on the surface, carbon segregation is obtained by sampling a low-magnification sample through drilling, and the carbon content at the central position is divided by the edge position to obtain a segregation index;
the fourth step: the lowest waste rate was determined when the specific water amount was 1.3L/kg and the second-zone secondary cooling water ratios were 34.98%, 42.36%, 12.32% and 10.34%.
The fourth step: the lowest waste and defective rate is determined when the specific water amount is 1.3L/kg and the second-zone second-cooling water ratio is 32.85%, 43.5%, 13.5% and 10.1%.
In this embodiment, the scaling factor M is the pulling rate, and M is the unit L/M.
In this example, the pulling rate is the length of the billet cast per minute in m.
In this example, the pulling rate was different for M and the defective rate was different.
In this embodiment, the minimum number of defective products is achieved by adjusting the value of M downward.
The same specific water amount and distribution proportion as those of 65/70 steel are originally used in carbon spring steel 65Mn and SWRH72BCr (1) (vanadium is added to the steel instead of SWRH82BCr), and the waste return caused by crack reaches 10%; after the novel water distribution proportion is used, the waste return is reduced to 0.5 percent, and an obvious effect is achieved.
Example 3
A method for solving casting blank cracks of high-carbon crack sensitive steel comprises the following steps:
the first step is as follows: the cooling section is divided into four parts, namely a first area, a second area, a third area and a fourth area;
the second step is that: the specific water amount of the secondary cooling water is adjusted from 1.4L/kg to 1.3L/kg, and the conclusion is obtained according to an empirical formula when the secondary cooling water is adjusted by 7.1 percent, wherein the waste inferior-quality products caused by transverse cracks are reduced, and the carbon segregation is not increased;
the third step: under the condition of 1.3L/kg of water, the proportion of cooling water in each zone is adjusted, the proportion of waste and defective products is lowest when the proportion of one zone to four zones is 34.98%, 42.36%, 12.32% and 10.34%, the proportion of waste and defective products corresponding to 32.11%, 46.79%, 11.47% and 9.63% is highest, the judgment of the waste and defective products is judged according to the grade of surface quality defects of the wire rod, the defects comprise scabs, saw teeth, shrinkage cavities and the like, the surface defects can be observed by naked eyes, obvious defects can be found on the surface, carbon segregation is obtained by sampling a low-magnification sample through drilling, and the carbon content at the central position is divided by the edge position to obtain a segregation index;
the fourth step: the lowest waste rate was determined when the specific water amount was 1.3L/kg and the second-zone secondary cooling water ratios were 34.98%, 42.36%, 12.32% and 10.34%.
The model of the casting machine is fixed, the steel grade of SWRH82BCr steel is fixed, and the quantity of defective products is stably reduced to 0.45 percent from the previous 1.7 percent after the parameters of a first zone, a second zone, a third zone and a fourth zone are adjusted.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A method for solving the problem of casting blank cracks of high-carbon crack sensitive steel is characterized by comprising the following steps:
the first step is as follows: the cooling section is divided into four parts, namely a first area, a second area, a third area and a fourth area;
the second step is that: the specific water amount of the secondary cooling water is adjusted from 1.4L/kg to 1.3L/kg, and the conclusion is obtained according to an empirical formula when the secondary cooling water is adjusted by 7.1 percent, wherein the waste inferior-quality products caused by transverse cracks are reduced, and the carbon segregation is not increased;
the third step: under the condition of 1.3 liters/kilogram of water, the proportion of cooling water in each zone is adjusted, the proportion of waste and defective products is the lowest when the proportion of one zone to four zones is 34.98%, 42.36%, 12.32% and 10.34%, the proportion of waste and defective products is higher when the proportion of water in the second zone is 33.64%, 43.78%, 12.44% and 10.14%, wherein the proportion of waste and defective products corresponding to 32.11%, 46.79%, 11.47% and 9.63% is the highest, the judgment of the waste and defective products is judged according to the surface quality defect grade of the wire rod, the defects comprise scabs, saw teeth, shrinkage cavities and the like, the surface defects can be observed by naked eyes to find that the surface has obvious defects, carbon segregation is obtained by drilling and sampling low-power samples, and dividing the edge position by the carbon content of the central position;
the fourth step: the lowest waste rate was determined when the specific water amount was 1.3L/kg and the second-zone secondary cooling water ratios were 34.98%, 42.36%, 12.32% and 10.34%.
2. The method for solving the casting blank crack of the high carbon crack sensitive steel grade according to claim 1, which is characterized in that: the proportionality coefficient is M multiplied by the pulling speed, and M is the unit L/M.
3. The method for solving the casting blank crack of the high carbon crack sensitive steel grade according to claim 2, which is characterized in that: the pulling speed is the length of casting steel billets per minute and is unit m.
4. The method for solving the casting blank crack of the high carbon crack sensitive steel grade according to claim 1, which is characterized in that: m is different under the same pulling speed, and the defective rate is different.
5. The method for solving the casting blank crack of the high carbon crack sensitive steel grade according to claim 1, which is characterized in that: and the lowest defective product is achieved by downwards adjusting the value of M.
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| JP2002363689A (en) * | 2001-06-12 | 2002-12-18 | Sumitomo Metal Ind Ltd | Hot-rolled steel plate with excellent hydrogen-induced cracking(hic) esistance, and its manufacturing method |
| JP2005334944A (en) * | 2004-05-27 | 2005-12-08 | Sumitomo Metal Ind Ltd | Continuous casting method for heat-resisting low-alloy steel, and continuously cast slab |
| CN101086203A (en) * | 2007-07-19 | 2007-12-12 | 天津钢铁有限公司 | Method for producing continuous casting round billet for petroleum bush using convertor process |
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