CN114939637A - Method for judging steel type capable of being subjected to mixed casting and judging mixed casting blank - Google Patents
Method for judging steel type capable of being subjected to mixed casting and judging mixed casting blank Download PDFInfo
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- 239000002436 steel type Substances 0.000 title claims abstract description 126
- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 179
- 239000010959 steel Substances 0.000 claims abstract description 179
- 238000009749 continuous casting Methods 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 229910000655 Killed steel Inorganic materials 0.000 claims description 80
- 229910052799 carbon Inorganic materials 0.000 claims description 77
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 75
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 71
- 229910000870 Weathering steel Inorganic materials 0.000 claims description 54
- 229910000954 Medium-carbon steel Inorganic materials 0.000 claims description 47
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 41
- 229910052782 aluminium Inorganic materials 0.000 claims description 41
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- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 37
- 238000010079 rubber tapping Methods 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- -1 carbon aluminum silicon Chemical compound 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
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- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 description 11
- 238000006731 degradation reaction Methods 0.000 description 11
- 238000005304 joining Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
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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
- B22D11/18—Controlling or regulating processes or operations for pouring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/30—Computing systems specially adapted for manufacturing
Abstract
The invention relates to a method for judging steel types capable of being subjected to mixed casting and judging blanks capable of being subjected to mixed casting, and belongs to the technical field of metallurgical methods. The technical scheme of the invention is as follows: classifying the casting steel types according to a steel type mixed casting type definition rule and establishing a type code of the casting steel types; according to the 'mixed casting permission rule among different casting steel types', a mixed casting continuous casting relation of different steel types is established between the casting steel type and other casting steel types of the same type; and after the mixed casting and continuous casting operation of the dissimilar steel grade is finished, converting into corresponding steel grade distinction according to a target component of the previous and subsequent heats and a target value difference of a handover blank according to a mixed casting molten steel handover blank judgment disposal rule, and finishing the judgment and disposal of the mixed casting molten steel handover blank. The invention has the beneficial effects that: the method has the advantages that the method realizes the maximum blank collecting production, can clearly judge which steel types can be mixed cast and the mixed cast blank judgment rule generated after mixed casting, improves the production efficiency, and reduces the quality and manufacturing cost loss caused by mixed casting of different steel types.
Description
Technical Field
The invention relates to a method for judging steel types capable of being subjected to mixed casting and judging blanks capable of being subjected to mixed casting, and belongs to the technical field of metallurgical methods.
Background
With the social development, the steel grades demanded by people are increasing day by day, and under the intense market competition mechanism, steel companies have to produce high-quality pure steel with different components in small batches. The continuous casting of the steel is easy, the operation rate of a continuous casting machine is improved, and the production cost is reduced. But not all different steel types can be mixed cast during continuous casting, and can steel types be mixed cast? How can the mixed casting billet produced after mixed casting of different steel grades be judged? The problems always puzzles metallurgical technicians for a long time, otherwise, because the mixed casting relation of steel types is not matched with continuous casting processes such as casting powder and the like, the mixed casting of different steel types leads to the increase of the judgment waste amount of the steel types and the increase of the judgment rate of steel plate components, so that the economic losses caused by the incoordination of a large number of components, the degradation judgment and the judgment waste of casting blanks are brought, the mixed casting iron inserting plates are more, the number of connected blanks is more, and the quality loss of the casting blanks and the steel-making manufacturing management cost are increased.
The prior published patents about mixed casting of molten steel relate to how to separate the mixed casting of molten steel; how to judge and track the mixed casting position and how to judge the length of the mixed casting billet. Such as the patent No. CN2366204Y "automatic insertion device of iron plate for separating different steel types from continuous casting" and the patent No. CN203245347U "insertion device for separating and joining molten steel of different compositions in continuous casting", both of which describe an iron plate insertion device for separating mixed casting molten steel. Publication No. CN110261566A "a composition change prediction method and system for a different steel type mixed casting billet", describes a composition change prediction method and system for a different steel type mixed casting billet; publication No. CN105108095A "a method of determining the head and tail positions and lengths of a mixed cast billet based on continuous temperature measurement of molten steel", describes a method of determining the head and tail positions and lengths of a mixed cast billet based on continuous temperature measurement of molten steel, and the like. But not all the different steel grades can be mixed cast in continuous casting, and which steel grades can be mixed cast? How can the mixed casting billet produced after mixed casting of different steel grades be judged? These problems have long plagued metallurgical technicians and there is a strong need for a new solution to the technical problem.
Disclosure of Invention
The invention aims to provide a method for judging the steel type capable of mixed casting and judging a mixed casting blank, which realizes the maximum blank collecting production by establishing a new mixed casting rule of the casting steel type, can clearly judge which steel types can be mixed cast and the mixed casting blank judgment rule generated after mixed casting, improves the production efficiency, reduces the quality and manufacturing cost loss caused by mixed casting of different steel types, and effectively solves the problems in the background technology.
The technical scheme of the invention is as follows: a method for judging the type of steel capable of being cast in a mixed mode and judging a mixed casting blank comprises the following steps:
(1) classifying the casting steel types according to a steel type mixed casting type definition rule and establishing a type code of the casting steel types;
(2) according to the 'mixed casting permission rule among different casting steel types', a mixed casting continuous casting relation of different steel types is established between the casting steel type and other casting steel types of the same type;
(3) after the mixed casting continuous casting operation of the different steel types is finished, according to the 'treatment rule for judging the mixed casting molten steel delivery blank', the target components of the previous and subsequent heats are different from the target value of the delivery blank, and the corresponding steel types are converted to be distinguished, so that the judgment and treatment of the mixed casting molten steel delivery blank are finished.
In the step (1), steel type mixed casting category definition rules are adopted, and determination participation judgment elements are determined according to the composition characteristics of various casting steel types, and steel type category codes are assigned in a category classification manner; in order to avoid that the same casting steel type belongs to different types at the same time, steel type mixed casting is classified according to priority, the priority is arranged in reverse order according to steel type class codes, the highest priority is a steel type class code [10], then is a steel type class code [11], and the like, the highest priority is a steel type class code [72], and the steel type mixed casting class definition rules are as follows:
1.1 definition of ultra-low carbon mild steel: the steel tapping mark with the target carbon of less than or equal to 0.0100 percent and the target Mn content of less than 0.4 percent is replaced by the upper limit of the carbon content when the target carbon content is not available; the ultra-low carbon soft steel is divided into special ultra-low carbon soft steel [10] and general ultra-low carbon soft steel [11], and the ultra-low carbon soft steel satisfying one of the following conditions is called special ultra-low carbon soft steel: the steel has the advantages that the steel has upper and lower limits of carbon element, upper and lower limits of phosphorus element, upper and lower limits of sulfur element, no lower limit of aluminum element or no content requirement of titanium element, and the balance of common ultra-low carbon mild steel;
1.2 ultra low carbon strength steel definition: a steel tapping mark with the target carbon being less than or equal to 0.0100% or the target carbon being less than or equal to 0.01% and the target Mn content being more than or equal to 0.40%;
1.3 definition of Low carbon Steel: the target carbon is > 0.0100%. Classified into general low carbon steels[30]And special low carbon steel[31]The low-carbon steel with the target P content of more than 0.030 percent is called special low-carbon steel;
1.4 definition of high carbon steel: tapping mark with target carbon content of more than 0.20 percent[40]；
1.5 definition and classification of weathering steel: the weathering steel is steel which is added with P, Cu or Cr elements and can resist environmental erosion, and is classified as special weathering steel[51]And general weathering steel[50]The special weathering steel contains Cu, Cr and P elements without target content in the tapping marks, except that the target Mn content is more than 1.5 percent or the target Si content is more than 1 percent, and the general weathering steel contains P or Cu elements;
1.6 pipeline Steel definition [60] and classification: the pipeline steel is used for conveying oil or gas substances, and has the following components: low S content, S < 0.005%, low C content, target C < 0.10%, Si, Nb, Ti or Ca elements defined as: si, Nb, Ti and Ca have target contents, no Cr content and target C less than 0.13%;
1.7 medium carbon steel definition and classification: the steel tapping marks except the steel types are classified into medium carbon steel, the medium carbon steel is classified into special medium carbon steel [70], medium carbon aluminum killed steel [71] and medium carbon aluminum silicon killed steel [72] according to the component specificity and the deoxidation mode, and the medium carbon steel is classified into the special medium carbon steel under the following condition: si is more than or equal to 1.0 percent, Mn is more than 1.5 percent, P with target content is more than or equal to 0.025 percent, S is less than or equal to 0.003 percent, Al with no target content or more than or equal to 1.0 percent, Cr is more than or equal to 0.4 percent or Mo is more than or equal to 0.4 percent; the aluminum sedation means that Si element in the tapping mark has no target content; the aluminum-silicon sedation means that Si element in the tapping mark has target content;
in the step (2), the mixed casting permission rules among different casting steel types are as follows:
2.1 the steel types which can be mixed with the special ultra-low carbon mild steel [10] are general ultra-low carbon mild steel [11], ultra-low carbon strength steel [20], general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.2 the types of steel which can be mixed cast with the general ultra-low carbon mild steel [11] include ultra-low carbon strength steel [20], general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.3 the steel types which can be mixed cast with the ultra-low carbon strength steel [20] are general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.4 the steel types which can be mixed cast with the general low carbon steel [30] are special low carbon steel [31], general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.5 the steel types which can be mixed with the special low carbon steel [31] are general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.6 the steel types which can be mixed cast with the high carbon steel [40] are general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.7 the steel types which can be mixed cast with the general weathering steel [50] are special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.8 the steel types which can be mixed cast with the special weathering steel [51] are pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.9 the steel types which can be mixed cast with the pipeline bridge steel [60] comprise special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.10 the types of steel which can be mixed cast with the special medium carbon steel [70] are aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.11 the category of steel which can be mixed with aluminum killed steel [71] is aluminum silicon killed steel [72 ].
In the step (3), the judgment of the mixed casting molten steel delivery billet is converted into corresponding steel type distinction by the computer according to the target component difference between the target component of the previous and subsequent heats and the target value of the delivery billet, the specific delta value is specifically determined according to the characteristics, quality grade and user application of the steel type, and the specific component difference values of different casting steel types are as follows:
3.1 ultra-low carbon mild steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ N, Δ B and Δ (Nb + Ti);
3.2 ultra-low carbon strength steel: Δ C, Δ Si, Δ Mn, Δ P, Δ Nb, Δ Ti, and Δ (Si + Mn + 3P);
3.3 Low carbon Steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, and Δ N;
3.4 high-alumina steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti) and Δ (Cr + Ni + Mo);
3.5 high-carbon steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti) and Δ (Cr + Ni + Mo);
3.6 general weathering steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Cu + Ni), and Δ Mo;
3.7 Special weathering steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Cu + Ni), and Δ Mo;
3.8 pipeline bridge steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Mo), and Δ (Cu + Ni);
3.9 medium carbon aluminum killed steel: Δ C, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), and Δ (Cr + Ni + Mo);
3.10 medium carbon aluminum silicon killed steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti), and Δ (Cr + Ni + Mo).
Different steel grade distinguishing symbols are set, wherein the steel grade distinguishing 1 indicates that an iron plate can be not inserted in the production operation, a tundish is not replaced, and the casting blank at the delivery part is processed according to the preset pass; the steel grade distinction YY shows that the jointed blank can be cut and scrapped according to a 'jointed blank cutting and scrapping standard', and the rest part can be released if meeting the requirement of a qualified blank; the steel grade distinction ZZ means judgment by technical quality department; the steel grade discrimination ZZZ means that it is judged by technical quality departments and product engineers together.
The invention has the beneficial effects that: by establishing a new mixed casting rule of casting steel types, the method realizes the maximum billet collecting production, can clearly judge which steel types can be mixed cast and the mixed casting billet judgment rule generated after mixed casting, improves the production efficiency, and reduces the quality and manufacturing cost loss caused by mixed casting of different steel types.
Drawings
FIG. 1 is a logic diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A method for judging the type of steel capable of being cast in a mixed mode and judging a mixed casting blank comprises the following steps:
(1) classifying the casting steel types according to a steel type mixed casting type definition rule and establishing a type code of the casting steel types;
(2) according to the 'mixed casting permission rule among different casting steel types', a mixed casting continuous casting relation of different steel types is established between the casting steel type and other casting steel types of the same type;
(3) after the mixed casting continuous casting operation of the different steel types is finished, according to the 'treatment rule for judging the mixed casting molten steel delivery blank', the target components of the previous and subsequent heats are different from the target value of the delivery blank, and the corresponding steel types are converted to be distinguished, so that the judgment and treatment of the mixed casting molten steel delivery blank are finished.
In the step (1), because the casting steel has multiple types, wide component range and wide application range, the management of the casting steel is convenient, on the basis of analyzing and researching the components of the casting steel, the matching relation of the casting steel, the covering slag and other continuous casting processes and the user using requirements of the casting steel are considered, the participating judgment elements are determined according to the component characteristics of various casting steel types (the microalloy elements are considered uniformly according to the functions of the microalloy elements in the steel), and the steel types are classified into ultra-low carbon mild steel, low carbon steel, high carbon steel and the like and are endowed with steel type codes; in order to avoid that the same casting steel type belongs to different types at the same time, steel type mixed casting is classified according to priority, the priority is arranged in reverse order according to steel type class codes, the highest priority is a steel type class code [10], then is a steel type class code [11], and the like, the highest priority is a steel type class code [72], and the steel type mixed casting class definition rules are as follows:
1.1 ultra-low carbon mild steel definition: the steel tapping mark with the target carbon of less than or equal to 0.0100 percent and the target Mn content of less than 0.4 percent is replaced by the upper limit of the carbon content when the target carbon content is not available; the ultra-low carbon mild steel is divided into special ultra-low carbon mild steel [10] and general ultra-low carbon mild steel [11], and the ultra-low carbon mild steel meeting one of the following conditions is called special ultra-low carbon mild steel: the steel has the advantages that the steel has upper and lower limits of carbon element, upper and lower limits of phosphorus element, upper and lower limits of sulfur element, no lower limit of aluminum element or no content requirement of titanium element, and the balance of common ultra-low carbon mild steel;
1.2 ultra low carbon strength steel definition: a steel tapping mark with the target carbon of less than or equal to 0.0100 percent or the target carbon of less than or equal to 0.01 percent and the target Mn content of more than or equal to 0.40 percent;
1.3 definition of Low carbon Steel: the target carbon is > 0.0100%. Classified into general low carbon steels[30]And special low carbon steel[31]The low-carbon steel with the target P content of more than 0.030 percent is called special low-carbon steel;
1.4 definition of high carbon steel: tapping mark with target carbon content of more than 0.20 percent[40]；
1.5 definition and classification of weathering steel: the weathering steel is steel which is added with P, Cu or Cr and the like and can resist environmental erosion, and is classified as special weathering steel[51]And general weathering steel[50]The special weathering steel contains Cu, Cr and P elements without target content in the tapping marks, except that the target Mn content is more than 1.5 percent or the target Si content is more than 1 percent, and the general weathering steel contains P or Cu elements;
1.6 definition of pipeline Steel[60]And classification: the pipeline steel is used for conveying oil or gas substancesThe steel grade has the following characteristics: low S content, S < 0.005%, low C content, target C < 0.10%, Si, Nb, Ti or Ca elements defined as: si, Nb, Ti and Ca have target contents, no Cr content and target C less than 0.13%;
1.7 definition and classification of medium carbon steel: the steel tapping marks except the steel types are classified into medium carbon steel, and the medium carbon steel is classified into special medium carbon steel according to the component specificity and the deoxidation mode[70]Medium carbon aluminium killed steel[71]And medium carbon aluminum silicon killed steel[72]One satisfying the following conditions is classified as a special medium carbon steel: si is more than or equal to 1.0 percent, Mn is more than 1.5 percent, P with target content is more than or equal to 0.025 percent, S is less than or equal to 0.003 percent, Al with no target content or more than or equal to 1.0 percent, Cr is more than or equal to 0.4 percent or Mo is more than or equal to 0.4 percent; aluminum sedation means that Si element in the tapping mark has no target content; the aluminum-silicon sedation means that Si element in the tapping mark has target content;
in the step (2), the method for judging whether the mixed casting of different casting steel types can be carried out is determined according to the size of component difference, application and quality requirements, and the permission rules of the mixed casting of different casting steel types are as follows:
2.1 the steel types which can be mixed cast with the special ultra-low carbon mild steel [10] are general ultra-low carbon mild steel [11], ultra-low carbon strength steel [20], general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.2 the types of steel which can be mixed cast with the general ultra-low carbon mild steel [11] include ultra-low carbon strength steel [20], general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.3 the steel types which can be mixed with the ultra-low carbon strength steel [20] are general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.4 the steel types which can be mixed cast with the general low carbon steel [30] are special low carbon steel [31], general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.5 the steel types which can be mixed cast with the special low carbon steel [31] are general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.6 the steel types which can be mixed cast with the high carbon steel [40] are general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.7 the steel types which can be mixed cast with the general weathering steel [50] are special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.8 the steel types which can be mixed cast with the special weathering steel [51] are pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.9 the steel types which can be mixed cast with the pipeline bridge steel [60] comprise special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.10 the types of steel which can be mixed cast with the special medium carbon steel [70] are aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.11 the category of steel which can be mixed with aluminum killed steel [71] is aluminum silicon killed steel [72 ].
In the above-mentioned step (3), since the composition of molten steel in both furnaces varies during continuous casting and mixed casting of different casting steel types, it is necessary to determine and treat the steel type of the mixed casting molten steel transfer billet (transition portion). The mixed casting molten steel connection billet judgment is converted into corresponding steel grade distinction by a computer according to target components of previous and next heats and target value differences (delta C, delta Si, delta Mn, delta P, delta S, delta Al and the like) of the connection billet, the specific delta value is specifically determined according to the characteristics, quality grade and user application of the steel grade, and the specific component difference values of different casting steel grades are as follows:
3.1 ultra-low carbon mild steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ N, Δ B and Δ (Nb + Ti);
3.2 ultra-low carbon strength steel: Δ C, Δ Si, Δ Mn, Δ P, Δ Nb, Δ Ti, and Δ (Si + Mn + 3P);
3.3 Low carbon Steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, and Δ N;
3.4 high-aluminum steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti) and Δ (Cr + Ni + Mo);
3.5 high-carbon steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti) and Δ (Cr + Ni + Mo);
3.6 general weathering steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Cu + Ni), and Δ Mo;
3.7 special weathering steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Cu + Ni), and Δ Mo;
3.8 pipeline bridge steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Mo), and Δ (Cu + Ni);
3.9 medium carbon aluminum killed steel: Δ C, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), and Δ (Cr + Ni + Mo);
3.10 medium carbon aluminum silicon killed steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti), and Δ (Cr + Ni + Mo).
Different steel grade distinguishing symbols are set, wherein the steel grade distinguishing 1 indicates that an iron plate can not be inserted in the production operation, a tundish is not replaced, and the casting blank at the delivery part is processed according to the preset; the steel grade distinction YY shows that the jointed blank can be cut and scrapped according to a 'jointed blank cutting and scrapping standard', and the rest part can be released if meeting the requirement of a qualified blank; the steel grade distinction ZZ means judgment by technical quality department; the steel grade discrimination ZZZ means that it is judged by technical quality departments and product engineers together.
Example (b):
the current production organization mode of a certain steel mill is to organize production according to contracts, and the steel mill has the advantages of multiple varieties, strict time requirement, small batch and high batch collection difficulty. The mixed casting and continuous casting of the dissimilar steel type are adopted, so that the front and back fluctuation of the components of the mixed casting slab is large, the quality standard and the user requirement are not met, the slab is degraded and scrapped, the quality objectional loss of the user is caused, and the quality loss and the manufacturing cost of the slab are increased.
The components of the casting steel are designed and discharged into a production plan according to the steel mixed casting type definition rule
Steel type mixed casting category definition rule
Classifying the casting steel grade automatically and establishing a class code of the casting steel grade, wherein the classifying method of the casting steel grade has a prompting function of establishing a continuous casting relation; according to the 'mixed casting permission rules among different casting steel types',
mix-casting permission rules among different casting steel types
Note: whether two types of steel in the table can be continuously cast or not needs to be inquired from all rows and all columns of the two types of steel, V-shaped marks are marked in the table to indicate that mixed casting can occur, and if the V-shaped marks do not exist, the V-shaped marks indicate that the two types of steel cannot be mixed cast.
The mixed casting and continuous casting relation of different steel types is automatically established between the casting steel type and other casting steel types of the same type. After the mixed casting continuous casting operation of the dissimilar steel is finished, according to the judgment and treatment rules of the mixed casting molten steel delivery billet,
judgment and treatment rule for mixed casting molten steel transfer billet
Method for judging V-shaped ultra-low carbon mild steel joint billet
| Sequence of | ΔC | ΔSi | ΔMn | ΔP | ΔS | ΔAl | ΔN | ΔB | Δ(Nb+Ti) | Determining relationships |
| 1 | .05 | 1 | 5 | 4 | 5 | 20 | 20 | 5 | 30 | 1 (original steel grade) |
| 2 | .15 | 1 | 5 | 6 | 8 | 30 | 30 | 5 | 50 | Degradation of |
| 3 | .20 | 2 | 10 | 8 | 8 | 30 | 30 | 20 | 50 | YY |
| 4 | .35 | 2 | 15 | 10 | 8 | 30 | 40 | 20 | 60 | ZZ |
Method for judging joining billet of ultralow-carbon-strength steel
| Sequence of events | ΔC | ΔSi | ΔMn | ΔP | ΔNb | ΔTi | Δ(Si+Mn+3P) | Determining relationships |
| 1 | .05 | 6 | 10 | 10 | 15 | 15 | 40 | 1 (original steel grade) |
| 2 | .10 | 6 | 15 | 15 | 20 | 20 | 60 | Degradation of |
| 3 | .15 | 10 | 20 | 20 | 20 | 20 | 70 | YY |
| 4 | .15 | 20 | 25 | 25 | 30 | 30 | 90 | ZZ |
| 5 | .15 | 20 | 25 | 25 | 30 | 30 | 110 | ZZZ |
Method for judging V-shaped low-carbon steel joint billet
| Sequence of | ΔC | ΔSi | ΔMn | ΔP | ΔS | ΔAl | ΔN | Determining relationships |
| 1 | 2 | 3 | 10 | 6 | 5 | 30 | 30 | 1 (original steel grade) |
| 2 | 3 | 3 | 15 | 10 | 10 | 50 | 40 | Degradation of |
| 3 | 4 | 3 | 25 | 20 | 16 | 60 | 40 | YY |
| 4 | 6 | 4 | 35 | 35 | 20 | 60 | 50 | ZZ |
Method for judging high-aluminum connected billet
| Sequence of | ΔC | ΔSi | ΔMn | ΔP | ΔS | ΔAl | Δ(Nb+Ti+V) | Δ(Cr+Ni+Mo) | Determining relationships |
| 1 | 2 | 10 | 20 | 5 | 2 | 100 | 20 | 20 | 1 (original steel grade) |
| 2 | 5 | 20 | 40 | 8 | 3 | 200 | 40 | 40 | Degradation of |
| 3 | 7 | 30 | 60 | 10 | 5 | 300 | 60 | 60 | YY |
Method for judging joined billet of V-shaped high-carbon steel
| Sequence of events | ΔC | ΔSi | ΔMn | ΔP | ΔS | ΔAl | Δ(Nb+Ti+V) | Δ(Cr+Ni+Mo) | Determining relationships |
| 1 | 5 | 10 | 20 | 5 | 3 | 30 | 60 | 40 | 1 (original steel grade) |
| 2 | 8 | 20 | 30 | 8 | 4 | 40 | 120 | 80 | Degradation of |
| 3 | 16 | 30 | 60 | 10 | 8 | 50 | 180 | 100 | YY |
Method for judging joining blank of V-shaped general weathering steel
| Sequence of | ΔC | ΔSi | ΔMn | ΔP | ΔS | Δ(Nb+Ti+V) | Δ(Cr+Cu+Ni) | ΔMo | Determining relationships |
| 1 | 3 | 20 | 20 | 20 | 3 | 30 | 30 | 10 | 1 (original steel grade) |
| 2 | 4.5 | 30 | 30 | 30 | 5 | 45 | 45 | 15 | Degradation of |
| 3 | 7 | 45 | 45 | 45 | 7 | 70 | 70 | 25 | YY |
Method for judging joining blank of V-shaped special weathering steel
| Sequence of | ΔC | ΔSi | ΔMn | ΔP | ΔS | Δ(Nb+Ti+V) | Δ(Cr+Cu+Ni) | ΔMo | Determining relationships |
| 1 | 3 | 20 | 20 | 5 | 3 | 30 | 30 | 10 | 1 (original steel grade) |
| 2 | 4.5 | 30 | 30 | 7 | 5 | 45 | 45 | 15 | Degradation of |
| 3 | 7 | 45 | 45 | 1O | 7 | 70 | 70 | 25 | YY |
Method for judging square pipe line bridge steel connection billet
| Sequence of | ΔC | ΔSi | ΔMn | ΔP | ΔS | Δ(Nb+Ti+V) | Δ(Cr+Mo) | Δ(Cu+Ni) | Determining relationships |
| 1 | 3 | 20 | 20 | 3 | 2 | 30 | 20 | 20 | 1 (original steel grade) |
| 2 | 4.5 | 30 | 30 | 5 | 4 | 45 | 30 | 40 | Degradation of |
| 3 | 7 | 45 | 50 | 8 | 6 | 70 | 40 | 60 | YY |
Method for judging intermediate-carbon aluminum killed steel joint billet
| Sequence of | ΔC | ΔMn | ΔP | ΔS | Δ(Nb+Ti+V) | Δ(Cr+Ni+Mo) | Determining relationships |
| 1 | 2 | 15 | 5 | 3 | 30 | 20 | 1 (original steel grade) |
| 2 | 3 | 25 | 10 | 5 | 60 | 30 | Degradation of |
| 3 | 5 | 50 | 15 | 10 | 90 | 60 | YY |
| 4 | 6 | 50 | 20 | 15 | 100 | 60 | ZZ |
Method for judging intermediate-carbon aluminum silicon killed steel joint billet
| Sequence of | ΔC | ΔSi | ΔMn | ΔP | ΔS | ΔAl | Δ(Nb+Ti+V) | Δ(Cr+Ni+Mo) | Determining relationships |
| 1 | 2 | 15 | 15 | 5 | 3 | 20 | 30 | 20 | 1 (original steel grade) |
| 2 | 3 | 30 | 25 | 10 | 5 | 30 | 60 | 30 | Degradation of |
| 3 | 5 | 60 | 50 | 15 | 10 | 50 | 90 | 60 | YY |
And converting the target components of the previous and subsequent heats into corresponding steel grades to be distinguished according to the target value difference of the transfer billet, and finishing the judgment and treatment of the mixed casting molten steel transfer billet. Therefore, through the production application of the invention, a new mixed casting rule of the casting steel is established, the maximum billet collecting production is realized, and the quality and manufacturing cost loss caused by mixed casting of different steel types is reduced.
Claims (4)
1. A method for judging the type of steel capable of being cast in a mixed mode and judging a mixed casting blank is characterized by comprising the following steps of:
(1) classifying the casting steel grade according to the steel grade mixed casting type definition rule and establishing a type code of the casting steel grade;
(2) according to the mixed casting permission rules among different types of casting steel, establishing a mixed casting continuous casting relation of different types of steel between the casting steel and other casting steel types of the same type;
(3) and after the mixed casting continuous casting operation of the different steel types is finished, converting into corresponding steel type distinction according to the treatment rule of the judgment of the mixed casting molten steel transfer blank and the target component difference between the front and back furnace times and the transfer blank, and finishing the judgment and treatment of the mixed casting molten steel transfer blank.
2. The method for judging the type of mixable pouring steel and judging the mixable pouring billet according to claim 1, wherein: in the step (1), steel type mixed casting category definition rules are adopted, and determination participation judgment elements are determined according to the composition characteristics of various casting steel types, and steel type category codes are assigned in a category classification manner; in order to avoid that the same casting steel type belongs to different types at the same time, steel type mixed casting is classified according to priority, the priority is arranged in reverse order according to steel type class codes, the highest priority is a steel type class code [10], then is a steel type class code [11], and the like, the highest priority is a steel type class code [72], and the steel type mixed casting class definition rules are as follows:
1.1 definition of ultra-low carbon mild steel: the steel tapping mark with the target carbon of less than or equal to 0.0100 percent and the target Mn content of less than 0.4 percent is replaced by the upper limit of the carbon content when the target carbon content is not available; the ultra-low carbon soft steel is divided into special ultra-low carbon soft steel [10] and general ultra-low carbon soft steel [11], and the ultra-low carbon soft steel satisfying one of the following conditions is called special ultra-low carbon soft steel: the steel has the advantages that the steel has upper and lower limits of carbon element, upper and lower limits of phosphorus element, upper and lower limits of sulfur element, no lower limit of aluminum element or no content requirement of titanium element, and the balance of common ultra-low carbon mild steel;
1.2 ultra low carbon strength steel definition: a steel tapping mark with the target carbon being less than or equal to 0.0100% or the target carbon being less than or equal to 0.01% and the target Mn content being more than or equal to 0.40%;
1.3 definition of Low carbon Steel: the target carbon is > 0.0100%. The low-carbon steel is divided into general low-carbon steel [30] and special low-carbon steel [31], and the low-carbon steel with the target P content of more than 0.030 percent is called special low-carbon steel;
1.4 definition of high carbon steel: a tapping mark [40] with the target carbon content of more than 0.20 percent;
1.5 definition and classification of weathering steel: the weathering steel is steel which is added with P, Cu or Cr and the like and can resist environmental erosion, the weathering steel is divided into special weathering steel [51] and general weathering steel [50], the special weathering steel contains Cu, Cr and P elements in the steel tapping marks and has no target content, but the target Mn content is more than 1.5 percent or the target Si content is more than 1 percent, and the general weathering steel contains P or Cu elements in the steel tapping marks;
1.6 pipeline Steel definition [60] and classification: the pipeline steel is used for conveying oil or gas substances, and has the following components: low S content, S < 0.005%, low C content, target C < 0.10%, Si, Nb, Ti or Ca elements defined as: si, Nb, Ti and Ca have target contents, no Cr content and target C less than 0.13%;
1.7 medium carbon steel definition and classification: the steel tapping marks except the steel types are classified into medium carbon steel, the medium carbon steel is classified into special medium carbon steel [70], medium carbon aluminum killed steel [71] and medium carbon aluminum silicon killed steel [72] according to the component specificity and the deoxidation mode, and the medium carbon steel is classified into the special medium carbon steel under the following condition: si is more than or equal to 1.0 percent, Mn is more than 1.5 percent, P with target content is more than or equal to 0.025 percent, S is less than or equal to 0.003 percent, Al with no target content or more than or equal to 1.0 percent, Cr is more than or equal to 0.4 percent or Mo is more than or equal to 0.4 percent; the aluminum sedation means that Si element in the tapping mark has no target content; aluminum silicon killed means that the Si element in the tapping marks has a target content.
3. The method for judging the type of mixable pouring steel and judging the mixable pouring billet according to claim 1, wherein: in the step (2), the mixed casting permission rules among different casting steel types are as follows:
2.1 the steel types which can be mixed cast with the special ultra-low carbon mild steel [10] are general ultra-low carbon mild steel [11], ultra-low carbon strength steel [20], general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.2 the types of steel which can be mixed cast with the general ultra-low carbon mild steel [11] include ultra-low carbon strength steel [20], general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.3 the steel types which can be mixed cast with the ultra-low carbon strength steel [20] are general low carbon steel [30], special low carbon steel [31], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.4 the steel types which can be mixed cast with the general low carbon steel [30] are special low carbon steel [31], general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.5 the steel types which can be mixed with the special low carbon steel [31] are general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.6 the steel types which can be mixed cast with the high carbon steel [40] are general weathering steel [50], special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.7 the steel types which can be mixed cast with the general weathering steel [50] are special weathering steel [51], pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.8 the steel types which can be mixed cast with the special weathering steel [51] are pipeline bridge steel [60], special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.9 the steel types which can be mixed cast with the pipeline bridge steel [60] comprise special medium carbon steel [70], aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.10 types of steel capable of being mixed with special medium carbon steel [70] are aluminum killed steel [71] and aluminum silicon killed steel [72 ];
2.11 the category of steel which can be mixed with aluminum killed steel [71] is aluminum silicon killed steel [72 ].
4. The method for judging the type of mixable pouring steel and judging the mixable pouring billet according to claim 1, wherein: in the step (3), the judgment of the mixed casting molten steel delivery billet is converted into corresponding steel type distinction by the computer according to the target component difference between the target component of the previous and subsequent heats and the target value of the delivery billet, the specific delta value is specifically determined according to the characteristics, quality grade and user application of the steel type, and the specific component difference values of different casting steel types are as follows:
3.1 ultra-low carbon mild steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ N, Δ B, and Δ (Nb + Ti);
3.2 ultra-low carbon strength steel: Δ C, Δ Si, Δ Mn, Δ P, Δ Nb, Δ Ti, and Δ (Si + Mn + 3P);
3.3 Low carbon Steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, and Δ N;
3.4 high-aluminum steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti) and Δ (Cr + Ni + Mo);
3.5 high-carbon steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti), and Δ (Cr + Ni + Mo);
3.6 general weathering steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Cu + Ni), and Δ Mo;
3.7 special weathering steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Cu + Ni), and Δ Mo;
3.8 pipeline bridge steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), Δ (Cr + Mo), and Δ (Cu + Ni);
3.9 medium carbon aluminum killed steel: Δ C, Δ Mn, Δ P, Δ S, Δ (Nb + V + Ti), and Δ (Cr + Ni + Mo);
3.10 medium carbon aluminum silicon killed steel: Δ C, Δ Si, Δ Mn, Δ P, Δ S, Δ Al, Δ (Nb + V + Ti), and Δ (Cr + Ni + Mo).
Different steel grade distinguishing symbols are set, wherein the steel grade distinguishing 1 indicates that an iron plate can not be inserted in the production operation, a tundish is not replaced, and the casting blank at the delivery part is processed according to the preset; the steel grade division YY indicates that the jointed blank can be cut and scrapped according to the jointed blank cutting and scrapping standard, and the rest part can be released if meeting the qualified blank requirement; the steel grade distinction ZZ means judgment by technical quality department; the steel grade discrimination ZZZ means that it is judged by technical quality departments and product engineers together.
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