CN115815554A - Process for mixed pouring and blank drawing among multiple steel types - Google Patents
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Abstract
The invention discloses a process for mixed casting and blank marking among multiple steel types, which comprises the following steps: firstly, mixed casting is carried out on steel grades with similar components, the rolling process difference is small, the liquid level of a tundish is not required to be reduced, mixed casting blanks are not required to be scribed, the blanks are directly scribed by a furnace, and the steel grades are sent to be rolled according to the lower components; secondly, performing mixed casting on steel types with similar components, and when the rolling process difference is large, independently dividing mixed casting blanks without reducing the control liquid level of a tundish, newly building a furnace number, and judging to send rolling according to the steel types with lower components; thirdly, mixed casting is carried out according to the large component difference between steel grades, mixed casting is organized according to the mode of reducing the liquid level of the tundish, and the mixed casting blank is divided separately according to the traveling position of the casting blank after passing through a fire cutter; the process for mixed casting and blank marking among multiple steel grades not only realizes the accuracy of the components of the marked mixed casting and ensures the stability of the components of the mixed casting furnace, but also can reduce the times of changing the tundish and reduce the using amount of the tundish.
Description
Technical Field
The invention particularly relates to a process for mixed casting and blank cutting among multiple steel types, and belongs to the technical field of mixed casting processes of multiple steel types.
Background
The tundish of the continuous casting machine is an intermediate link of a steelmaking production flow, has the functions of storing steel, stabilizing flow, shunting, homogenizing temperature, removing inclusions and the like, and can ensure the smooth running of continuous casting of the molten steel stored in the tundish in the ladle changing process, and is a connecting point for changing the intermittent operation of the molten steel into the continuous operation; in the production process, when one steel grade is produced and another steel grade is replaced, the replacement operation of a new tundish is required, so that the mixing of different steel grades can be effectively avoided, and the generation of mixed casting blanks is avoided; however, with the increase of orders of different steel types by customers, when the steel types are replaced, the number of continuous casting furnaces of a single tundish of a continuous casting machine is low due to the corresponding replacement of a new tundish, particularly small-batch orders, and the service life of the tundish of the continuous casting machine is greatly reduced; meanwhile, the head cutting amount and the tail cutting amount of the casting blank are increased due to frequent start and stop operations, so that the waste of the casting blank is increased, and the metal yield is reduced; in conclusion, the production efficiency is greatly reduced, and the production cost of the process is increased.
Along with people to continuous casting process work efficiency more and more high, satisfy the continuous production of many grades of steel kind simultaneously in the continuous casting process, consequently carry out many grades of steel continuous casting on same conticaster, promptly, one kind of steel kind of same pouring basket is poured and is ended, continues to pour another grade of steel, and the middle new pouring basket that need not be changed can carry out continuous casting. Particularly, the production of a large batch of steel grades can effectively reduce the production cost in the continuous casting process; however, mixed casting is carried out among different steel types, the composition of the previous steel type is reserved in the tundish for continuous casting, and after the ladle change is finished, other steel types are subjected to large ladle casting, so that molten steel with two compositions is partially mixed in the tundish, and because of the difference of the compositions, a mixed casting blank is required to be divided to generate a mixed casting blank; if the mixed casting is improperly controlled, the smooth production is affected, and the quality problem of components of a casting blank is caused. Therefore, a process for mixed pouring and blank drawing among multiple steel types is needed to stably produce and meet the production and quality requirements of large batches and multiple steel types.
Disclosure of Invention
In order to solve the problems, the invention provides a process for mixed casting and blank marking among multiple steel types, which can effectively reduce the replacement frequency of a tundish and stabilize the service life of the tundish when producing a large batch of multiple steel types; the method has the advantages of reducing the blank throwing amount caused by changing the tundish, improving the metal yield, reducing the production cost, increasing the production efficiency, accurately pouring and marking the blank, and effectively ensuring the component requirement of the mixed pouring blank.
The invention relates to a process for mixed casting and blank cutting among multiple steel grades, which comprises the following steps of preparing mixed casting and blank cutting flows among different steel grades according to steel grade components to finish continuous casting of different steel grades, wherein the process comprises the following specific steps:
firstly, mixed casting is carried out on steel grades with similar components, the rolling process difference is small, the liquid level of a tundish is not required to be reduced, mixed casting blanks are not required to be scribed, the blanks are directly scribed by a furnace, and the steel grades are sent to be rolled according to the lower components;
secondly, performing mixed casting on steel types with similar components, and when the rolling process difference is large, independently dividing mixed casting blanks without reducing the control liquid level of a tundish, newly building a furnace number, and judging to send rolling according to the steel types with lower components;
thirdly, carrying out mixed casting according to the large component difference between steel grades, organizing the mixed casting in a mode of reducing the liquid level of a tundish, independently dividing the mixed casting blank according to the traveling position of the casting blank after passing through a fire cutter, sampling components at the first head part and the last tail part of the mixed casting blank, building a furnace number, and judging to send to be rolled according to the component result;
and finally, the steel grades have large component difference, mixed casting is not carried out, or mixed casting is carried out according to a joint secondary casting starting mode, the components are verified at the head and the tail of the first billet after the joint, and rolling is judged according to the component results.
Further, the components of the steel grades are similar, and the concrete casting of the steel grades in the rolling process with little difference is as follows: HRB400E-2G, HRB400E-3, HRB400E-5, HRB400E-6 and HRB400E-7 steel billets are mixed and cast, the mixed and cast billets are not separately divided, are directly separated into furnaces and are rolled according to the principle of low components;
the mixed casting is carried out on the steels with similar components, and when the rolling process difference is large, the mixed casting is carried out specifically as follows:
HRB400E-1 and HRB400E-2G/HRB400E-2 are mixed for casting, and a continuous casting machine organizes billet mixed casting according to the following flow: the two-furnace refining outbound temperature of mixed casting is increased by 3 to 5 ℃ compared with the normal furnace, the liquid level of the molten steel in the middle ladle is controlled to be 480 to 530mm before mixed casting, the mixed casting furnace is used for large-scale ladle casting, after the mixed casting furnace is used for large-scale ladle casting, a main control worker records the running position of the steel billet, the steel billet is informed to perform billet drawing, and the billet drawing is started by the billet drawing worker according to the running position of the steel billet provided by the main control worker; independently marking the mixed casting blank, and judging according to the principle of low component;
and carrying out mixed casting according to the large component difference between the steel grades, and organizing according to a liquid level lowering mixed casting mode, such as two groups of mixed casting steel grades: HRB400E series steel (HRB 400E-3/HRB 400E-5/HRB 400E-6/HRB 400E-7) and HRB500E series steel (HRB 500E-2/HRB500E-3/HRB500E-2G/HRB 500E-5/HRB 500E-4/HRB500E-6/HRB 500E-7) are mixed and cast, and a continuous casting machine organizes steel billet mixing and casting according to the following flow:
a. mixed pouring operation requirements: the two-furnace refining outbound temperature of mixed casting is increased by 3 to 5 ℃ compared with the normal furnace, the liquid level of the molten steel in the middle ladle is controlled to be 380 to 430mm before mixed casting, the mixed casting furnace is used for large-scale ladle casting, after the mixed casting furnace is used for large-scale casting, a main control worker records the running position of the steel billet, informs a knockout worker to perform billet drawing, and the knockout worker starts to draw the billet according to the running position of the steel billet provided by the main control worker;
b. mixed casting blank sampling requirement: sampling the head of the first billet in each flow of the mixed casting part and the tail of the last billet in the mixed casting part, and analyzing chemical components; the identification requirements of the sampled billet and the sampled billet sample are as follows: the stream number-the first billet-the head and the tail, and the head and the tail are respectively represented by 1 and 2; for example, the 2-stream 1 st billet header, identifies "2-1-1" on both the billet and the corresponding billet sample; 2, marking the tail part of the 3 rd flow billet by 2-3-2% on the billet and the corresponding billet sample;
c. and (3) judging a mixed casting blank: and after the component inspection of the mixed casting blank is finished, judging to send to rolling.
Further, when the HRB500E mixed casting furnace steel grades have similar components, the continuous casting machine organizes steel billet mixed casting according to the following flow: the two-furnace refining outbound temperature of mixed casting is increased by 3 to 5 ℃ compared with the normal furnace, the liquid level of a tundish before mixed casting is controlled according to 480 to 530mm, the mixed casting furnace is opened for ladle casting, after the mixed casting furnace is opened for casting, a main control worker records the running position of a steel billet, the steel billet is informed to perform billet drawing, and the billet drawing is started by the billet drawing worker according to the running position of the steel billet provided by the main control worker; the mixed casting blank is judged according to the principle that the components are low:
if HRB500E-3 and HRB500E-2 steel types are mixed and poured, the mixed and poured billet is rolled according to HRB 500E-2; HRB500E-3 and HRB500E-4 steel grades are mixed and cast, and a mixed casting blank is rolled according to HRB 500E-3; HRB500E-5 and HRB500E-3 are mixed and poured, and the mixed and poured blank is made of steel according to the HRB500E-3 specification; HRB500E-5 and HRB500E-2 are mixed and cast, and the mixed cast blank is rolled according to HRB 500E-2; HRB500E-6 and HRB500E-4 are mixed for casting, HRB500E-7 and HRB500E-4 are mixed for casting, and the casting is carried out according to HRB500E-4 steel grade; HRB500E-7 and HRB500E-6 are mixed and cast, and the mixed and cast blank is sent and rolled according to HRB500E-6 steel grade before and after the mixed and cast blank; other steels not shown in HPB300 series, HRB400E series and HRB500E series do not allow mixed casting.
Compared with the prior art, the process for mixed casting and blank marking among multiple steel grades not only realizes the accuracy of the components of the marked mixed casting, ensures the stability of the components of the mixed casting furnace, but also can reduce the times of changing the tundish to reduce the using amount of the tundish.
Drawings
FIG. 1 is a detail drawing of the direct furnace steel grade division of mixed casting with similar components of mixed casting furnace steel grades.
FIG. 2 is a schematic diagram of mixed casting and blank drawing of mixed casting furnace grade steel with similar components (large difference of rolling process) according to the invention.
FIG. 3 is a schematic diagram for judging the mixed casting billet of the mixed casting furnace grade steel components (with large difference in rolling process) according to the invention.
FIG. 4 is a schematic diagram of a mixed casting and mixed casting blank drawing method with large composition difference between different steel types of the mixed casting furnace.
Fig. 5 is a graph showing the trend of the average service life of the tundish in the processes of 1 to 7 months.
FIG. 6 is a graph showing the variation trend of the yield of the continuously cast steel slabs in 1-7 months.
FIG. 7 is a schematic diagram of the control requirements of HRB400E-3 and HRB500E-5 compositions of the steel grade of the present invention.
FIG. 8 is a schematic diagram of the verification of the sampling components of the head and tail samples of the two-heat mixed casting billets HRB400E-3 and HRB500E-5 of the steel grades of the invention.
Detailed Description
Example 1:
the invention relates to a process for mixed casting and blank cutting among multiple steel grades, which comprises the following steps of preparing mixed casting and blank cutting flows among different steel grades according to steel grade components to finish continuous casting of different steel grades, wherein the process comprises the following specific steps:
firstly, mixed casting is carried out on steel grades with similar components, the rolling process difference is small, the liquid level of a tundish is not required to be reduced, mixed casting blanks are not required to be scribed, the blanks are directly scribed in a furnace, and the steel grades are sent to be rolled according to the lower components;
secondly, performing mixed casting on steel types with similar components, and when the rolling process difference is large, independently dividing mixed casting blanks without reducing the control liquid level of a tundish, newly building a furnace number, and judging to send rolling according to the steel types with lower components;
thirdly, carrying out mixed casting according to the large component difference between steel grades, organizing the mixed casting in a mode of reducing the liquid level of a tundish, independently dividing the mixed casting blank according to the traveling position of the casting blank after passing through a fire cutter, sampling components at the first head part and the last tail part of the mixed casting blank, building a furnace number, and judging to send to be rolled according to the component result;
and finally, the steel grades have large component difference, mixed casting is not carried out, or mixed casting is carried out according to a joint secondary casting starting mode, the components are verified at the head and the tail of the first billet after the joint, and rolling is judged according to the component results.
As shown in fig. 1, the steel grades have similar components, and the concrete casting process with a small difference in rolling process is as follows: HRB400E-2G, HRB400E-3, HRB400E-5, HRB400E-6 and HRB400E-7 steel billets are mixed and poured, the mixed and poured billets are not separately divided, are directly separated into furnaces, and are delivered and rolled according to the principle that the components are low;
as shown in fig. 2 and 3, the mixed casting is performed on the steel grades with similar components, and when the rolling process difference is large, the mixed casting specifically comprises the following steps:
HRB400E-1 and HRB400E-2G/HRB400E-2 are mixed for casting, and a continuous casting machine organizes billet mixed casting according to the following flow: the two-furnace refining outbound temperature of mixed casting is increased by 3 to 5 ℃ compared with the normal furnace, the liquid level of the molten steel in the middle ladle is controlled to be 480 to 530mm before mixed casting, the mixed casting furnace is used for large-scale ladle casting, after the mixed casting furnace is used for large-scale ladle casting, a main control worker records the running position of the steel billet, the steel billet is informed to perform billet drawing, and the billet drawing is started by the billet drawing worker according to the running position of the steel billet provided by the main control worker; independently marking the mixed casting blank, and judging according to the principle of low component;
and carrying out mixed casting according to the large component difference between the steel grades, and organizing according to a liquid level lowering mixed casting mode, such as two groups of mixed casting steel grades: HRB400E series steel (HRB 400E-3/HRB 400E-5/HRB 400E-6/HRB 400E-7) and HRB500E series steel (HRB 500E-2/HRB500E-3/HRB500E-2G/HRB 500E-5/HRB 500E-4/HRB500E-6/HRB 500E-7) are mixed and cast, and a continuous casting machine organizes steel billet mixing and casting according to the following flow:
a. mixed pouring operation requirements: the two-furnace refining outbound temperature of mixed casting is increased by 3 to 5 ℃ compared with the normal furnace, the liquid level of the molten steel in the middle ladle is controlled to be 380 to 430mm before mixed casting, the mixed casting furnace is used for large-scale ladle casting, after the mixed casting furnace is used for casting, a main control worker records the running position of the steel billet, informs a knockout worker to perform billet drawing, and starts to draw the billet according to the running position of the steel billet provided by the main control worker, as shown in fig. 4;
b. mixed casting blank sampling requirement: sampling the head of the first billet in each flow of the mixed casting part and the tail of the last billet in the mixed casting part, and analyzing chemical components; the identification requirements of the sampled billet and the sampled billet sample are as follows: the stream number-the first billet-the head and the tail, and the head and the tail are respectively represented by 1 and 2; for example, the 2-stream 1 st billet header, identifies "2-1-1" on both the billet and the corresponding billet sample; 2, marking the tail part of the 3 rd flow billet by 2-3-2% on the billet and the corresponding billet sample;
c. and (3) judging a mixed casting blank: and after the component inspection of the mixed casting blank is finished, judging to send to rolling.
When the components of the secondary steel grades of the HRB500E mixed casting furnace are close, a continuous casting machine organizes mixed casting of steel billets according to the following flow: the two-furnace refining outbound temperature of mixed casting is increased by 3 to 5 ℃ compared with the normal furnace, the liquid level of a tundish before mixed casting is controlled by 480 to 530mm, the mixed casting furnace is opened for large-scale ladle casting, after the mixed casting furnace is opened for casting, a main control worker records the running position of a steel billet, the main control worker is informed to perform billet drawing, the billet drawing worker starts to draw the billet according to the running position of the steel billet provided by the main control worker, and as shown in fig. 4, the mixed casting billet is judged according to the principle that the components are low: if HRB500E-3 and HRB500E-2 steel types are mixed and cast, rolling the mixed and cast blank according to HRB 500E-2; HRB500E-3 and HRB500E-4 steel grades are mixed and cast, and a mixed casting blank is rolled according to HRB 500E-3; HRB500E-5 and HRB500E-3 are mixed and poured, and the mixed and poured blank is made of steel according to the HRB500E-3 specification; HRB500E-5 and HRB500E-2 are mixed and poured, and the mixed and poured blank is rolled according to HRB 500E-2; HRB500E-6 and HRB500E-4 are mixed for casting, HRB500E-7 and HRB500E-4 are mixed for casting, and the casting is carried out according to HRB500E-4 steel grade; HRB500E-7 and HRB500E-6 are mixed and poured, and the mixed and poured billets are delivered and rolled according to HRB500E-6 steel grade before and after the mixed and poured billets; other steels not shown in HPB300 series, HRB400E series and HRB500E series do not allow mixed casting.
The process for mixed casting and blank marking among multiple steel types has the following advantages:
as shown in FIG. 5, when a large amount of steel grades are produced by continuous casting, the process of the invention can carry out planned tissue mixed casting according to the components of the mixed casting steel grades before and after production, does not need to replace a tundish, can reduce the replacement frequency of the tundish, stably prolongs the average service life of the tundish, and improves the average service life of the tundish from 35.5 hours in 1 month of 2022 to 42.5 hours in 7 month of 2022, and the service life is improved by 12.8 percent compared with the service life; therefore, the service life of the tundish can be effectively prolonged in the prior art, the using number of the tundish is reduced, and the using cost of the tundish refractory material is reduced.
As shown in figure 6, the process of the invention effectively reduces the opening and stopping frequency of the tundish, enables different steel types to be mixed and cast continuously, reduces the head cutting, tail cutting and waste throwing amount in the process, improves the metal yield from 99.42 percent in 1 month of 2022 to 99.80 percent in 7 months of 2022, reduces the production cost and improves the continuous casting production efficiency.
According to the process, molten steel at the mixed casting point forms a mixed casting blank which does not belong to the components of the former furnace steel and the latter furnace steel, the division of the billet of the former furnace, the mixed casting blank and the later furnace is carried out through the effective control of the liquid level of the tundish at the mixed casting point and the walking position of the billet under the platform, the accurate blank division can be achieved, the effect is obvious, and the stability of the components of the mixed casting steel is effectively ensured.
As shown in fig. 7 and 8, a steel grade HRB400E-3 and a steel grade HRB500E-5 are mixed and poured, as shown in fig. 7, the component control requirements of the two steel grades are met, the liquid level of the molten steel in the tundish is controlled within 380-430mm before the mixed pouring, the ladle is poured in a mixed pouring furnace, after the mixed pouring furnace is poured in, a main controller records (photographs) the running position of the billet, informs a billet discharger to perform billet drawing, and the billet discharger starts the billet drawing according to the running position of the billet provided by the main controller; according to the blank dividing scheme, the distance between the head of a steel blank and the fire cutter is X meters, when the head of the steel blank runs through the fire cutter, 3 mixed casting blanks are continuously divided per stream when the head of the steel blank runs by 0-4 meters, 2 mixed casting blanks are continuously divided per stream when the head of the steel blank runs by 4-10 meters, 2 mixed casting blanks are continuously divided per stream when the head of the steel blank runs by X-10 meters, a first head sample of the mixed casting blank and a last tail sample of the mixed casting blank are extracted for component inspection, the component result is shown in figure 8, the component of the head sample meets the component requirement of the HRB400E-3 of the steel type, the component of the tail sample meets the HRB500E-5 of the steel type, and the mixed casting blanks are successfully divided;
in conclusion, the process of the invention conducts organization mixed casting through the difference of the components between two mixed casting steel grades, and conducts effective blank cutting through the control height of the liquid level of the tundish at the mixed casting point and the walking position of the casting blank under the platform, thereby achieving the effective division of the mixed casting blank and ensuring the components of the steel grades after the mixed casting steel grades; the using quantity of the tundish can be reduced, and the average service life of the tundish is prolonged; but also can reduce the casting blank loss in the process and improve the yield of the molten steel.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (3)
1. The process for mixed casting and blank drawing among multiple steel types is characterized in that the process comprises the following steps of preparing mixed casting and blank drawing flows among different steel types according to steel type components, and completing continuous casting of different steel types, and the process comprises the following specific steps:
firstly, mixed casting is carried out on steel grades with similar components, the rolling process difference is small, the liquid level of a tundish is not required to be reduced, mixed casting blanks are not required to be scribed, the blanks are directly scribed by a furnace, and the steel grades are sent to be rolled according to the lower components;
secondly, performing mixed casting on steel types with similar components, and when the rolling process difference is large, independently dividing mixed casting blanks without reducing the control liquid level of a tundish, newly building a furnace number, and judging to send rolling according to the steel types with lower components;
thirdly, carrying out mixed casting according to the large component difference between steel grades, organizing the mixed casting in a mode of reducing the liquid level of a tundish, independently dividing the mixed casting blank according to the traveling position of the casting blank after passing through a fire cutter, sampling components at the first head part and the last tail part of the mixed casting blank, building a furnace number, and judging to send to be rolled according to the component result;
and finally, the steel grades have large component difference, mixed casting is not carried out, or mixed casting is carried out according to a joint secondary casting starting mode, the components are verified at the head and the tail of the first billet after the joint, and rolling is judged according to the component results.
2. The process of hybrid pouring and scoring between multiple steel grades according to claim 1, characterized in that: the components of the steel grades are similar, and the concrete casting is carried out by the rolling process with small difference: HRB400E-2G, HRB400E-3, HRB400E-5, HRB400E-6 and HRB400E-7 steel billets are mixed and cast, the mixed and cast billets are not separately divided, are directly separated into furnaces and are rolled according to the principle of low components;
the mixed casting is carried out on the steels with similar components, and when the rolling process difference is large, the mixed casting is carried out specifically as follows:
HRB400E-1 and HRB400E-2G/HRB400E-2 are mixed for casting, and a continuous casting machine organizes billet mixed casting according to the following flow: the two-furnace refining outbound temperature of mixed casting is increased by 3 to 5 ℃ compared with the normal furnace, the liquid level of the molten steel in the middle ladle is controlled to be 480 to 530mm before mixed casting, the mixed casting furnace is used for large-scale ladle casting, after the mixed casting furnace is used for large-scale ladle casting, a main control worker records the running position of the steel billet, the steel billet is informed to perform billet drawing, and the billet drawing is started by the billet drawing worker according to the running position of the steel billet provided by the main control worker; independently marking the mixed casting blank, and judging according to the principle of low component;
the steel grade is mixed and cast with large component difference, and the structure is formed according to a liquid level lowering mixed casting mode, and the method specifically comprises the following steps: HRB400E series steel grades and HRB500E series steel grades are mixed and cast, and a continuous casting machine organizes mixed casting of steel billets according to the following flow:
a. mixed pouring operation requirements: the two-furnace refining outbound temperature of mixed casting is increased by 3 to 5 ℃ compared with the normal furnace, the liquid level of the molten steel in the middle ladle is controlled to be 380 to 430mm before mixed casting, the mixed casting furnace is used for large-scale ladle casting, after the mixed casting furnace is used for large-scale casting, a main control worker records the running position of the steel billet, informs a knockout worker to perform billet drawing, and the knockout worker starts to draw the billet according to the running position of the steel billet provided by the main control worker;
b. the mixed casting blank sampling requirement is as follows: sampling the head of the first steel billet in each flow of the mixed casting part and the tail of the last steel billet in the mixed casting part, and analyzing chemical components; the identification requirements of the sampled billet and the sampled billet sample are as follows: the stream number-the first billet-the head and the tail, and the head and the tail are respectively represented by 1 and 2;
c. and (3) judging a mixed casting blank: and after the component inspection of the mixed casting blank is finished, judging to send to rolling.
3. The process of hybrid pouring and scoring between multiple steel grades according to claim 1, characterized in that: when the HRB500E mixed casting furnace steel grades have similar components, the continuous casting machine organizes the mixed casting of the steel billets according to the following flow: and (3) improving the temperature of the two-furnace refining station of mixed casting by 3 to 5 ℃ compared with the normal furnace, controlling the liquid level of the tundish before mixed casting according to 480 to 530mm, carrying out large-scale ladle casting of the mixed casting furnace, recording the running position of the billet by a master controller after the mixed casting furnace is carried out, informing the billet puller to carry out billet drawing, and starting the billet drawing by the billet puller according to the running position of the billet provided by the master controller.
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| CN202211706924.4A CN115815554A (en) | 2022-12-29 | 2022-12-29 | Process for mixed pouring and blank drawing among multiple steel types |
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| CN202211706924.4A CN115815554A (en) | 2022-12-29 | 2022-12-29 | Process for mixed pouring and blank drawing among multiple steel types |
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