CN109371211B - Steel strip manufacturing method - Google Patents
Steel strip manufacturing method Download PDFInfo
- Publication number
- CN109371211B CN109371211B CN201811175365.2A CN201811175365A CN109371211B CN 109371211 B CN109371211 B CN 109371211B CN 201811175365 A CN201811175365 A CN 201811175365A CN 109371211 B CN109371211 B CN 109371211B
- Authority
- CN
- China
- Prior art keywords
- steel
- processed
- steel billet
- billet
- heating furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to the technical field of steel production, in particular to a steel belt manufacturing method. The manufacturing method of the steel strip comprises the following steps: processing the provided molten steel to obtain a steel billet to be processed with a chamfer structure at the edge; sending the steel billet to be processed into a heating furnace for soaking treatment to form a finished steel billet, and sending out; and rolling the finished steel billet to form a finished steel belt. According to the steel strip production method, the edge of the steel billet to be processed is made into the shape with the chamfer structure, so that the edge of the steel billet to be processed is prevented from having convex edges like the steel billet with the right-angle edge structure adopted in the prior art, therefore, after the steel billet to be processed is processed by an acid pickling process, the thin line defects at the edge can be greatly improved, the appearance of the finished steel strip is effectively beautified, and meanwhile, the service life of a stamping grinding tool for processing the finished steel strip can be effectively prolonged.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a steel belt manufacturing method.
Background
The DP steel belongs to advanced high-strength steel grades, and the cold-rolled DP steel comprises high-quality hot-rolled steel strips which are used as raw materials, surface oxide layers of the high-quality hot-rolled steel strips are removed through an acid pickling process, and finally, the surface quality and the use requirements (mainly stamping and hole expansion performance) of the DP steel obtained through the processes of cold rolling, annealing and the like meet the actual requirements. The application of DP steel is not limited to structural members but extends to the application of outer plates, the production of which is also performed according to the quality requirements of cold-rolled outer plates. In actual production, DP steel after pickling often has a plurality of surface defects, such as edge color difference, surface yellowing, edge thin lines and the like, which seriously affect the appearance and service life of DP steel. The edge color difference and the surface yellowing can be solved by controlling the temperature of key points of a hot rolling process, and controlling the atmosphere of a cold rolling annealing furnace and a roller surface coating in the furnace, but the edge fine line defect cannot be solved so far.
Disclosure of Invention
In view of the above, the present invention provides a method for manufacturing a steel strip to solve the above problems.
The steel strip manufacturing method provided by the embodiment of the invention comprises the following steps:
processing the provided molten steel to obtain a steel billet to be processed with a chamfer structure at the edge;
sending the steel billet to be processed into a heating furnace for soaking treatment to form a finished steel billet, and sending out;
and rolling the finished steel billet to form a finished steel belt.
Further, the steel liquid that provides is handled, obtains the pending steel billet that the border has the chamfer structure, includes:
injecting the provided molten steel into a chamfering blank casting machine;
and starting the chamfer blank casting machine to cast the steel blank so as to form the steel blank to be processed.
Further, the size range of the chamfer structure is (20 mm-25 mm) × (40 mm-60 mm).
Further, before the steel billet to be processed is sent into the heating furnace for soaking treatment to form a finished steel billet and sent out, the method further comprises the following steps:
monitoring the temperature change condition of the steel billet to be processed;
and when the temperature of the steel billet to be processed is within a first temperature threshold value range, the step of sending the steel billet to be processed into a heating furnace for soaking treatment to form a finished steel billet and sending out the finished steel billet.
Further, the first temperature threshold range is 400 ℃ to 450 ℃.
Further, the step of sending the steel billet to be processed into a heating furnace for soaking treatment to form a finished steel billet and sending out comprises the following steps:
feeding the steel billet to be treated into the heating furnace;
setting the operating parameters of the heating furnace, and starting the heating furnace to operate according to the operating parameters so as to carry out soaking treatment on the billet to be treated;
monitoring the temperature change condition of the steel billet to be processed, and when the temperature of the steel billet to be processed is in a second temperature threshold range, indicating that the finished steel billet is formed;
and sending the finished steel billet out of the heating furnace.
Further, the setting of the operation parameters of the heating furnace comprises:
setting the working time of the heating furnace as a preset time;
and adjusting the opening of the burner of the heating furnace according to a preset opening adjusting rule.
Further, the preset time is less than 200min, and/or the preset opening adjustment rule is that the opening value of the burner at the driving side of the heating furnace is X, the opening of the burner at the operating side of the heating furnace is Y, and the opening of the burner at the middle part of the heating furnace is Z, wherein X is more than Y and more than Z.
Further, the second temperature threshold range is 1240 ℃ to 1260 ℃.
Further, the rolling the finished steel billet to form a finished steel strip includes:
sending the finished steel billet into a roughing mill for preliminary rolling to form a steel strip to be treated;
and sending the steel strip to be processed into a finishing mill for secondary rolling to form the finished steel strip.
Further, before the finished steel billet is sent into a roughing mill for preliminary rolling to form a steel strip to be processed, the method further comprises the following steps:
setting the upper limit of the rolling tonnage of the vertical roll of the roughing mill as a preset weight value;
and setting the width reduction amount of the vertical roller rolling of the roughing mill within a preset width reduction amount threshold range.
Further, the preset weight value is 4 ten thousand tons, and/or the preset width reducing threshold range is 0 mm-40 mm.
Further, before the steel strip to be processed is sent into the finishing mill for secondary rolling to form the finished steel strip, the method comprises the following steps:
closing cooling water at the edge of the front three frames of the finishing mill;
and increasing the proportion of the cooling water in the middle of the first three frames of the finishing mill to a preset proportion value.
Further, the preset proportion value is 50%.
The steel strip production method provided by the invention comprises the steps of treating the provided molten steel to obtain a steel billet to be treated with a chamfer structure at the edge, delivering the steel billet to be treated into a heating furnace for soaking treatment to form a finished steel billet, delivering the finished steel billet out, and rolling the finished steel billet to form a finished steel strip. According to the steel strip production method, the edge of the steel billet to be processed is made into the shape with the chamfer structure, so that the edge of the steel billet to be processed is prevented from having convex edges like the steel billet with the right-angle edge structure adopted in the prior art, therefore, after the steel billet to be processed is processed by an acid pickling process, the thin line defects at the edge can be greatly improved, the appearance of the finished steel strip is effectively beautified, and meanwhile, the service life of a stamping grinding tool for processing the finished steel strip can be effectively prolonged.
The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description in order to make the technical means of the present invention more clearly understood, and the detailed description of the present invention will be given below in order to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only some embodiments of the invention and are therefore not to be considered limiting of its scope, for those skilled in the art will be able to derive additional related drawings therefrom without the benefit of the inventive faculty.
Fig. 1 is a flowchart illustrating steps of a method for manufacturing a steel strip according to an embodiment of the present invention.
Fig. 2 is a front view of a steel billet to be processed according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating sub-steps of step S200 in fig. 1.
Fig. 4 is a flowchart illustrating sub-steps of step S300 in fig. 1.
Fig. 5 is a macroscopic view schematically showing a thin line defect region on the edge of a billet manufactured by a conventional steel strip manufacturing method.
Fig. 6 is a schematic view showing the results of cross-sectional analysis of the skinning position in the thin line defect region on the edge of a billet produced by a conventional steel strip production method.
Icon: 100-a slab to be treated.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the actual production of DP steel, the DP steel raw material after pickling often has a number of surface defects, such as edge color difference, surface yellowing, and edge line, which seriously affect the appearance and service life of the DP steel. Among them, the edge thin line defect is a thin line defect (filiform, non-straight edge line) appearing on the edge after the DP steel is cleaned of the surface oxide layer by the pickling process and the substrate is exposed, and is often called as an edge thin line defect because it is within 20mm to 40mm close to the edge of the DP steel. Because the fine line defect of limit portion that the DP steel exists seriously influences its aesthetic measure for the preparation of planking such as household electrical appliances, car can't be applied to it, simultaneously, also can influence life.
The research of the inventor finds that the DP steel in the existing steel strip manufacturing method adopts a manufacturing raw material which is a steel billet with a right-angle edge structure, the edge of the steel billet often has a rib, and the side edge also has a protruding structure with the protruding length of about 8 mm.
Based on this, referring to fig. 1, an embodiment of the present invention provides a method for manufacturing a steel strip to solve the above problem, the method comprising:
and S100, processing the provided molten steel to obtain a steel billet to be processed with a chamfer structure at the edge.
In practical implementation, as a first implementation manner, the provided molten steel may be injected into a right-angle billet caster to obtain a billet with a right-angle edge, and then the billet is processed by a manual chamfering process to obtain a billet to be processed with a chamfered edge. As a second embodiment, the molten steel may be poured into a chamfer blank casting machine, and the chamfer blank casting machine may be started to cast a steel blank, so as to directly form the steel blank to be processed. In this embodiment, in order to improve the production efficiency, it is preferable to form the billet to be processed according to the second embodiment. In addition, in this embodiment, the fact that the edge of the billet to be processed has the chamfered structure means that the edges of the upper surface and the lower surface of the billet to be processed both have the chamfered structure.
Referring to fig. 2, in an alternative embodiment, the size of the chamfer structure ranges from (20mm to 25mm) to (40mm to 60 mm). That is, the distance L1 between the edge of the top/bottom surface of the steel billet 100 to be processed and the side surface thereof ranges from 20mm to 25mm, and the distance L2 between the edge of the side surface of the steel billet 100 to be processed and the top/bottom surface thereof ranges from 40mm to 60 mm.
And S200, delivering the steel billet to be processed into a heating furnace for soaking treatment to form a finished steel billet, and delivering the finished steel billet.
The heating furnace is a device which supplies heat through a burner (an air heat accumulation burner or a gas heat accumulation burner) on the side of a furnace wall so as to carry out soaking treatment on the billet to be treated which is fed into the heating furnace. In this embodiment, the heating furnace that adopts divide into first heating section, second heating section and soaking section from the feed inlet to the discharge gate, and it mainly adopts heat accumulation formula combustion technology to carry out the heat transfer, and in addition, in this embodiment, the nozzle can be in first heating section, second heating section and soaking section heat supply from top to bottom.
The inventor researches and discovers that the working time of the heating furnace, the opening degree of a burner and the tapping temperature of the heating furnace have certain influence on the formation of side thin line defects in the process of feeding the steel billet to be treated into the heating furnace for soaking treatment. Based on this, please refer to fig. 3, in this embodiment, the step S200 may include four sub-steps of step S210, step S220, step S230, and step S240.
And step S210, sending the billet to be processed into the heating furnace.
And S220, setting the operation parameters of the heating furnace, and starting the heating furnace to operate according to the operation parameters so as to carry out soaking treatment on the billet to be treated.
In this embodiment, the operation parameters include the operating time of the heating furnace and the opening degree of the burner.
Further, setting the operation parameters of the heating furnace may include setting the operating time of the heating furnace to a preset time, and adjusting the opening of the burner of the heating furnace according to a preset opening adjustment rule.
In this embodiment, the preset duration may be any duration less than 200 min. The preset opening adjustment rule can be that the opening value of the burner at the driving side of the heating furnace is X, the opening of the burner at the operating side of the heating furnace is Y, and the opening of the burner at the middle part of the heating furnace is Z, wherein X is more than Y and more than Z. That is, the opening degree of the burner at the driving side of the heating furnace is larger than that of the burner at the operating side of the heating furnace, and the opening degree of the burner at the operating side of the heating furnace is larger than that of the burner at the middle part of the heating furnace.
Through the arrangement, the temperature difference between the edge part and the middle part of the billet to be processed can be reduced, so that the problems of poor edge part deformation and the like possibly occurring in the subsequent rolling stage are avoided, and the defect of a thin line on the edge part is further improved.
Step S230, monitoring a temperature change condition of the billet to be processed, and when the temperature of the billet to be processed is within a second temperature threshold range, indicating that the finished billet is formed. That is, in this embodiment, the tapping temperature of the heating furnace of the finished steel billet needs to be within the second temperature threshold range.
Optionally, in this embodiment, the second temperature threshold range is 1240 ℃ to 1260 ℃.
And step S240, sending the finished steel billet out of the heating furnace.
In the existing steel strip manufacturing method, the steel billet sent out from the billet caster is generally sent into the heating furnace for soaking treatment after being cooled, namely, the cold loading mode is sent in a cold mode, so that the bending degree of the steel billet can be increased, the protruding length of the side protruding structure of the steel billet can be increased in the cooling process, and the thin line defect of the edge of the steel billet is more obvious after the steel billet is treated by the pickling process. Therefore, in order to reduce the bending degree of the steel billet to be processed and further improve the thin line defect at the edge, in this embodiment, before the step S200, the method for manufacturing a steel strip may further include monitoring the temperature change of the steel billet to be processed, and performing the step S200 when the temperature of the steel billet to be processed is within the first temperature threshold range.
Optionally, in this embodiment, the first temperature threshold range is 400 ℃ to 450 ℃. That is, in this embodiment, the steel feeding temperature of the steel billet to be processed needs to be within the first temperature threshold range, and belongs to the hot feeding and hot charging mode.
Through the arrangement, the bending degree of the steel billet to be processed is reduced, and the side edge of the steel billet to be processed can be prevented from appearing a protruding structure, so that the fine line defect of the edge part is further improved.
And step S300, rolling the finished steel billet to form a finished steel belt.
In this embodiment, the finished steel billet may be primarily rolled by a roughing mill and secondarily rolled by a finishing mill, and based on this, referring to fig. 4, the step S300 may include two substeps, i.e., a step S310 and a step S320.
And S310, sending the finished steel billet into a roughing mill for preliminary rolling to form a steel strip to be treated.
The inventors microscopically analyzed the thin line defect region on the side of the billet produced by the conventional steel strip production method and the peripheral region of the thin line defect region on the side, and as a result, it was found that the thin line defect region on the lower side of the scanning electron microscope had a certain skinning phenomenon, and that the skinning phenomenon was microscopically intermittent, but macroscopically observed with the naked eye was always continuous, as shown in fig. 5. In addition, the inventors performed cross-sectional analysis of the skinning position of the thin line defect region at the edge of the slab manufactured by the conventional steel strip manufacturing method, and the analysis result showed that the skinning position had a significant coarse grain phenomenon and that many point-like substances were present at the junction of the skinning position and the base, as shown in fig. 6. Further, the inventors also performed a micro-area spectrum analysis of the edge thin line defect region of the billet produced by the conventional steel strip production method, and as a result of the analysis, as shown in table 1, it was found that the edge thin line defect region of the billet produced by the conventional steel strip production method is mainly Fe element in large amount, and secondarily contains O element, Mn element, and Co element in small amounts.
TABLE 1
From the analysis results, it can be determined that the billet is mixed with abnormal elements in the rolling process, the mixed abnormal elements have certain influence on the formation of the thin line defects at the edge part, and the abnormal elements are often derived from the width fixing machine and the vertical roll surface which are contacted with the billet in the primary rolling process. Therefore, in this embodiment, it is necessary to ensure the quality of the width setter and the surface of the vertical roll as much as possible, that is, to ensure smooth and flat surfaces of the width setter and the surface of the vertical roll as much as possible, and it is necessary to control the upper limit of the tonnage of the vertical roll rolling so as to reduce the pressure value between the finished billet and the surface of the vertical roll, and to control the width reduction amount of the vertical roll rolling. Based on this, in this embodiment, before step S310, the method may further include setting an upper limit of a number of tons of edgerolling of the roughing mill to a preset weight value, and setting an amount of edgerolling reduction of the roughing mill within a preset threshold range of the amount of reduction.
In this embodiment, the preset weight value may be 4 ten thousand tons, and the preset width reduction threshold range may be 0mm to 40 mm.
And S320, conveying the steel strip to be processed into a finishing mill for secondary rolling to form the finished steel strip.
The inventor researches and discovers that the temperature of the first three stands of the finish rolling area is generally more than 950 ℃, if the temperature of the edge part of the steel strip to be processed is excessively reduced, the area with poor edge part plastic deformation enters into the two-phase area for rolling, the pro-eutectoid ferrite of the edge part does not generate austenite recovery recrystallization during finish rolling, so that the crystal grains are larger, and coarse grains are formed, which is consistent with the analysis result of the section analysis of the peeling position of the thin line defect area of the edge part of the billet manufactured by the existing steel strip manufacturing method. Based on this, in this embodiment, before step S320, the method includes closing the cooling water at the edge of the first three stands of the finishing mill, and increasing the ratio of the cooling water in the middle of the first three stands of the finishing mill to a preset ratio value. Thus, the temperature drop of the edge of the steel strip to be treated can be effectively reduced.
Optionally, in this embodiment, the preset proportion value is 50%, which is 20% higher than the proportion of the cooling water in the middle of the first three frames of the finishing mill in the existing steel strip manufacturing method.
In order to verify the effect of the steel strip manufacturing method provided by the embodiment of the invention on improving the edge thin line defects, the inventor also compares the steel plate manufactured by the conventional steel manufacturing method with the steel plate manufactured by the steel strip manufacturing method provided by the embodiment of the invention, and the relevant parameters and results of the experiment are as follows.
Experiment one (existing steel manufacturing method)
As shown in Table 2, the steel grade is DP590, the blank casting machine is a right-angle blank casting machine, the cold charging temperature of the cold feeding of the steel blank is 100 ℃, the steel tapping temperature of the heating furnace of the steel blank is 1200 ℃, the working time of the heating furnace is 240min, the steel blank belongs to the earlier stage of the vertical roll, the roll surface quality of the vertical roll is good, the cooling water on the edge of the front three frames of the finishing mill is started, the proportion of the cooling water in the middle of the front three frames of the finishing mill is 30%, and after tracking the surface of the steel plate after the acid pickling process treatment, the obvious edge fine line defects are.
TABLE 2
Experiment two (Steel strip manufacturing method provided by the embodiment of the invention)
As shown in Table 3, the steel grade is DP590, the blank casting machine is a chamfer blank casting machine, the hot charging temperature of the steel blank is 450 ℃, the opening of a burner of the heating furnace is adjusted according to a preset opening adjustment rule, the tapping temperature of the heating furnace of the finished steel blank is 1250 ℃, the working time of the heating furnace is 200min, the steel blank belongs to the middle and front of a vertical roll, the quality of the roll surface is good, the cooling water on the edge of the front three frames of the finishing mill is closed, the cooling water proportion on the middle of the front three frames of the finishing mill is 50%, and then the surface of the finished steel strip after the pickling process is tracked to show that no obvious edge fine line defects exist.
TABLE 3
In summary, the steel strip production method provided by the embodiment of the invention includes processing the provided molten steel to obtain a to-be-processed steel billet with a chamfered structure at the edge, sending the to-be-processed steel billet into a heating furnace to perform soaking treatment to form a finished steel billet, sending out the finished steel billet, and rolling the finished steel billet to form a finished steel strip. According to the steel strip production method, the edge of the steel billet to be processed is made into the shape with the chamfer structure, so that the edge of the steel billet to be processed is prevented from having convex edges like the steel billet with the right-angle edge structure adopted in the prior art, therefore, after the steel billet to be processed is processed by an acid pickling process, the thin line defects at the edge can be greatly improved, the appearance of the finished steel strip is effectively beautified, and meanwhile, the service life of a stamping grinding tool for processing the finished steel strip can be effectively prolonged.
In the description of the present invention, it should also be noted that the terms "disposed" and "connected" are to be construed broadly and, for example, may be fixedly connected, detachably connected, or integrally connected, unless expressly stated or limited otherwise. Either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method of making a steel strip, comprising:
processing the provided molten steel to obtain a steel billet to be processed with a chamfer structure at the edge; wherein the size range of the chamfer structure is (20 mm-25 mm) × (40 mm-60 mm);
sending the steel billet to be processed into a heating furnace for soaking treatment to form a finished steel billet, and sending out;
rolling the finished steel billet to form a finished steel belt;
wherein, the steel billet to be processed is sent into a heating furnace for soaking treatment to form a finished steel billet, and before being sent out, the method also comprises the following steps:
monitoring the temperature change condition of the steel billet to be processed;
when the temperature of the steel billet to be processed is within a first temperature threshold value range, the step of sending the steel billet to be processed into a heating furnace for soaking treatment to form a finished steel billet and sending out the finished steel billet;
the first temperature threshold range is 400-450 ℃;
the steel billet to be processed is sent into a heating furnace for soaking treatment to form a finished steel billet, and the finished steel billet is sent out, and the method comprises the following steps:
feeding the steel billet to be treated into the heating furnace;
setting the operating parameters of the heating furnace, and starting the heating furnace to operate according to the operating parameters so as to carry out soaking treatment on the billet to be treated;
monitoring the temperature change condition of the steel billet to be processed, and when the temperature of the steel billet to be processed is in a second temperature threshold range, indicating that the finished steel billet is formed;
sending the finished steel billet out of the heating furnace;
the second temperature threshold range is 1240 ℃ to 1260 ℃.
2. The method of claim 1, wherein the processing of the supplied molten steel to obtain a steel slab to be processed having a chamfered structure at an edge comprises:
injecting the provided molten steel into a chamfering blank casting machine;
and starting the chamfer blank casting machine to cast the steel blank so as to form the steel blank to be processed.
3. A method of making a steel strip according to claim 1, wherein said setting of operating parameters of said furnace comprises:
setting the working time of the heating furnace as a preset time;
and adjusting the opening of the burner of the heating furnace according to a preset opening adjusting rule.
4. The method for manufacturing the steel strip according to claim 3, wherein the preset time period is less than 200min, and/or the preset opening adjustment rule is that the opening value of the burner at the driving side of the heating furnace is X, the opening of the burner at the operating side of the heating furnace is Y, and the opening of the burner at the middle part of the heating furnace is Z, wherein X > Y > Z.
5. The method of claim 1 wherein said rolling said finished steel blank to form a finished steel strip comprises:
sending the finished steel billet into a roughing mill for preliminary rolling to form a steel strip to be treated;
and sending the steel strip to be processed into a finishing mill for secondary rolling to form the finished steel strip.
6. The method of claim 5, wherein prior to introducing the finished steel slab into the roughing mill for initial rolling to form a strip to be treated, the method further comprises:
setting the upper limit of the rolling tonnage of the vertical roll of the roughing mill as a preset weight value;
and setting the width reduction amount of the vertical roller rolling of the roughing mill within a preset width reduction amount threshold range.
7. A method of manufacturing a steel strip according to claim 6, characterized in that said predetermined weight value is 4 ten thousand tons and/or said predetermined width reduction threshold value ranges from 0mm to 40 mm.
8. The method of making a steel strip as claimed in claim 5 wherein the method comprises, before feeding the steel strip to be treated into a finishing mill for secondary rolling to form the finished steel strip:
closing cooling water at the edge of the front three frames of the finishing mill;
and increasing the proportion of the cooling water in the middle of the first three frames of the finishing mill to a preset proportion value.
9. A method for producing a steel strip according to claim 8, characterized in that said predetermined proportion value is 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811175365.2A CN109371211B (en) | 2018-10-10 | 2018-10-10 | Steel strip manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811175365.2A CN109371211B (en) | 2018-10-10 | 2018-10-10 | Steel strip manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109371211A CN109371211A (en) | 2019-02-22 |
| CN109371211B true CN109371211B (en) | 2020-11-20 |
Family
ID=65403325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811175365.2A Active CN109371211B (en) | 2018-10-10 | 2018-10-10 | Steel strip manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109371211B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110877049B (en) * | 2019-12-16 | 2021-10-29 | 钢铁研究总院 | Temperature equalizing method for high-temperature billet passing through heating furnace |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09327743A (en) * | 1996-06-12 | 1997-12-22 | Sanyo Special Steel Co Ltd | Crack generation preventing method in cogging |
| JP2002224702A (en) * | 2000-11-30 | 2002-08-13 | Kawasaki Steel Corp | Method of manufacturing stainless steel plate |
| CN101209459A (en) * | 2006-12-27 | 2008-07-02 | 鞍钢股份有限公司 | Method for cold rolling high silicon electric steel |
| CN201791735U (en) * | 2010-04-28 | 2011-04-13 | 首钢总公司 | Slab sizing press module |
| CN103831412A (en) * | 2014-02-26 | 2014-06-04 | 钢铁研究总院 | Production method for controlling straight crack defect of surface edge of medium-thick plate |
| CN104928616A (en) * | 2015-07-01 | 2015-09-23 | 西峡龙成特种材料有限公司 | Thermal spraying method for slab continuous-casting and chamfering crystallizer narrow copper plate |
-
2018
- 2018-10-10 CN CN201811175365.2A patent/CN109371211B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09327743A (en) * | 1996-06-12 | 1997-12-22 | Sanyo Special Steel Co Ltd | Crack generation preventing method in cogging |
| JP2002224702A (en) * | 2000-11-30 | 2002-08-13 | Kawasaki Steel Corp | Method of manufacturing stainless steel plate |
| CN101209459A (en) * | 2006-12-27 | 2008-07-02 | 鞍钢股份有限公司 | Method for cold rolling high silicon electric steel |
| CN201791735U (en) * | 2010-04-28 | 2011-04-13 | 首钢总公司 | Slab sizing press module |
| CN103831412A (en) * | 2014-02-26 | 2014-06-04 | 钢铁研究总院 | Production method for controlling straight crack defect of surface edge of medium-thick plate |
| CN104928616A (en) * | 2015-07-01 | 2015-09-23 | 西峡龙成特种材料有限公司 | Thermal spraying method for slab continuous-casting and chamfering crystallizer narrow copper plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109371211A (en) | 2019-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109465295B (en) | Method for preventing edge cracking and strip breakage of hot continuous rolled steel plate in cold rolling | |
| CN102699028A (en) | Method for eliminating linear edge defects of hot-rolled low-carbon steel | |
| CN104525560A (en) | Effective control method for pitted surface of plain carbon steel/Nb-containing steel plate of 20-30 mm thickness | |
| CN107641699A (en) | Method based on CSP flows production Thin Specs hot rolling DP780 steel | |
| CN104438326B (en) | Rolling technology for high-carbon steel in thin slab casting and rolling | |
| CN107716551B (en) | Method based on CSP process production thin gauge hot rolling DP980 steel | |
| CN108149180A (en) | A kind of production method of SGH490 heat zinc coating plates | |
| CN105734403B (en) | A kind of steel saw blade hot-rolled coil and its production method | |
| CN111633026A (en) | Control method for reducing linear defects at edge of hot-rolled medium-high carbon alloy steel | |
| CN102553920B (en) | Production method of aluminum tape for base of printing plate | |
| CN109772883A (en) | A kind of production method of IF steel | |
| CN113042532A (en) | Bi-containing high magnetic induction oriented silicon steel hot-rolled strip steel edge quality control method | |
| CN109371211B (en) | Steel strip manufacturing method | |
| CN104593698B (en) | Method for manufacturing high-strength cold-rolled weather resisting steel plates and high-strength cold-rolled weather resisting steel plates | |
| CN104289550B (en) | A kind of control method of cold rolling high-strength bell-type annealing strip flatness | |
| CN103290311A (en) | Method for manufacturing civil high-grade anti-theft door plank | |
| CN107641700B (en) | Method based on CSP process production thin gauge hot rolling DP1180 steel | |
| CN113953335B (en) | Manufacturing method for eliminating hot rolling edge cracks of oriented silicon steel | |
| CN112658041B (en) | Stainless steel plate and production method thereof | |
| CN103752609A (en) | Method for rolling current-conducting copper bar or plate by using hot rolling machine | |
| CN114406226A (en) | Continuous casting and rolling method for micro-alloy low-carbon steel medium plate | |
| CN102527719B (en) | Production method of aluminum foil for computer direct composing and printing | |
| CN113578960A (en) | Hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality | |
| CN113231464A (en) | Method for reducing incidence rate of mixed crystal defects on surface of pickled plate | |
| CN113210421A (en) | Production method for controlling transverse plate shape of high-quality carbon structural steel plate based on single-frame wide and thick plate rolling line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |