CN115354205B - Preparation method of peritectic steel and peritectic steel - Google Patents
Preparation method of peritectic steel and peritectic steel Download PDFInfo
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- CN115354205B CN115354205B CN202210930688.8A CN202210930688A CN115354205B CN 115354205 B CN115354205 B CN 115354205B CN 202210930688 A CN202210930688 A CN 202210930688A CN 115354205 B CN115354205 B CN 115354205B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
- B21B1/224—Edge rolling of flat products
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- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0239—Lubricating
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention particularly relates to a preparation method of subcontracting steel and subcontracting steel, and belongs to the technical field of steel preparation. The preparation method of the peritectic steel comprises smelting, continuous casting, hot rolling, coiling and cold rolling; and (3) continuous casting: controlling the cooling intensity of the crystallizer to be preset intensity; the mold flux of the crystallizer adopts low carbon steel mold flux; controlling the argon flow of the crystallizer to be in a preset state; controlling the steel passing amount of the crystallizer to be a preset steel passing amount; when hot rolling, the following steps: controlling the tapping temperature heated before hot rolling to be a preset temperature; chamfering by adopting a width fixing machine; vertical roll lubrication is adopted; the width reduction of the hot rolling is controlled to be a preset width reduction. The preparation method can effectively solve the technical problem that the quality of the edge of the sub-peritectic steel product cannot be effectively guaranteed by the existing preparation method, can reduce yield loss, does not increase large-scale equipment, is low in cost, is convenient and flexible to operate, can greatly reduce defects, and improves qualification rate and yield.
Description
Technical Field
The invention belongs to the technical field of steel preparation, and particularly relates to a preparation method of subcontracting steel and subcontracting steel.
Background
The problem of edge quality of the cold rolled product with the subcrystal component with high surface quality is remarkable, and the edge linear defect is the most main degradation defect and has the following characteristics: within 40mm from the edge of the strip steel, the strip steel is generally about 20mm, and the strip steel is in a straight line shape, continuous or intermittent in rolling, so that obvious peeling phenomenon is seriously seen. The defect is not visible due to iron sheet coverage or a light degree in most cases of cold rolled raw materials (hot rolled coils), and the problem of cold rolling batch quality is often caused by the fact that the hot rolling process is not found and emergency measures are not taken. The defects are harmful defects on the sub-peritectic steel with high surface quality requirements, and in order to ensure the product quality, the production line has to take measures for increasing the trimming amount, so that the yield loss is influenced, the manufacturing cost is increased, and the production efficiency is also influenced.
Disclosure of Invention
The aim of the application is to provide a preparation method of the peritectic steel, so as to solve the technical problem that the quality of the edge of the peritectic steel product cannot be effectively guaranteed by the existing preparation method.
The embodiment of the invention provides a preparation method of sub-peritectic steel, which comprises smelting, continuous casting, hot rolling, coiling and cold rolling;
and during continuous casting:
controlling the cooling intensity of the crystallizer to be preset intensity;
the mold flux of the crystallizer adopts low-carbon steel mold flux;
controlling the argon flow of the crystallizer to be in a preset state;
controlling the steel passing amount of the crystallizer to be a preset steel passing amount;
the hot rolling is as follows:
controlling the tapping temperature heated before hot rolling to be a preset temperature;
chamfering by adopting a width fixing machine;
vertical roll lubrication is adopted;
and controlling the width reduction of the hot rolling to be a preset width reduction.
Optionally, controlling the cooling intensity of the crystallizer to be a preset intensity includes:
controlling the cooling intensity of the broad surface of the cooling water of the crystallizer to be 1120-1140NL/min/t;
controlling the cooling strength of the narrow surface of the cooling water of the crystallizer to be 150-160NL/min/t.
Optionally, the alkalinity of the low-carbon steel protecting slag is 0.9-0.95, the melting temperature of the low-carbon steel protecting slag is 1050 ℃, and the melting speed of the low-carbon steel protecting slag is 30-40s.
Optionally, controlling the argon flow of the crystallizer to be in a preset state includes:
controlling the flow rate of the argon of the crystallizer stopper rod to be 3.0-3.4NL/min;
controlling the argon flow of the upper water gap of the crystallizer to be 3.0-3.4NL/min;
controlling the argon flow between the crystallizer plates to be 5.0-5.4NL/min.
Optionally, controlling the steel flux of the crystallizer to be a preset steel flux includes:
controlling the section width of the crystallizer to be less than or equal to 1600mm, and controlling the steel passing amount of the casting crystallizer to be less than or equal to 3.85t/min;
controlling the section width of the crystallizer to be less than or equal to 1400mm, and controlling the steel passing amount of the casting crystallizer to be less than or equal to 3.62t/min.
Optionally, the preset temperature is greater than or equal to 1030+ [ delta ] T, wherein: delta T is the rough rolling temperature drop.
Optionally, the chamfering amount of the width fixing machine is 40mm, and the chamfering depth of the width fixing machine is 20mm.
Optionally, the concentration of the lubricating oil for vertical roll lubrication is more than or equal to 0.3%.
Optionally, the preset width reduction is 50-150mm.
The embodiment of the invention also provides the peritectic steel, which is prepared by adopting the preparation method of any one of the peritectic steel.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
according to the preparation method of the sub-peritectic steel, provided by the embodiment of the invention, by controlling the operation details of a continuous casting process, particularly controlling the cooling intensity of a crystallizer, the protecting slag of the crystallizer, the argon flow of the crystallizer and the steel feeding amount of the crystallizer, a slab with excellent tissue performance is obtained through continuous casting, a certain temperature is ensured after the slab is discharged out of a heating furnace by controlling the operation details of a hot rolling process, then the intermediate slab is chamfered to be matched with the widening amount by a widening machine, the metal temperature drop speed of the edge part of the intermediate slab is slowed down, and the rough rolling process is ensured to be performed above a high-temperature brittle zone; the quality of the edge of the intermediate blank is further improved through vertical roll lubrication; by fine control in continuous casting and hot rolling, high-quality raw materials with fewer defects are provided for the cold rolling process, so that the edge quality of the prepared sub-peritectic steel product is effectively ensured. Compared with the existing defect removal method, the defect removal method has the advantages that yield loss is reduced, large-scale equipment is not added, the cost is low, the operation is convenient and flexible, the defects can be greatly reduced, and the qualification rate and the yield are improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a method provided by an embodiment of the present invention.
Detailed Description
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present invention. For example, room temperature may refer to a temperature in the range of 10 to 35 ℃.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
The guide rail steel is subcontracting steel for household appliances, the C content is about 0.08%, and in order to relieve the generation of middle crack defects, the continuous casting is usually produced according to a peritectic process, so that the problems of coarse structure of a casting blank and precipitation of strip carbides along grain boundaries are caused; in the hot rolling process, in order to reduce process energy consumption and burning loss and reduce tapping temperature, the trend is that corner metals fall into a high-temperature brittle zone in the hot rolling process, and linear defects at the edges are generated. Since the hot rolled coil is covered with scale or the defect is not visible to a lesser extent, the defect is prominent during the cold rolling process, and mass quality degradation is extremely likely to occur. In order to ensure the product quality, the production line has to take measures for increasing the trimming amount, so that the yield loss is influenced, the manufacturing cost is increased, and the production efficiency is also influenced.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
according to an exemplary embodiment of the present invention, there is provided a method for preparing a peritectic steel, including smelting, continuous casting, hot rolling, coiling and cold rolling;
and during continuous casting:
controlling the cooling intensity of the crystallizer to be preset intensity;
the mold flux of the crystallizer adopts low-carbon steel mold flux;
controlling the argon flow of the crystallizer to be in a preset state;
controlling the steel passing amount of the crystallizer to be a preset steel passing amount;
the hot rolling is as follows:
controlling the tapping temperature heated before hot rolling to be a preset temperature;
chamfering by adopting a width fixing machine;
vertical roll lubrication is adopted;
and controlling the width reduction of the hot rolling to be a preset width reduction.
According to the preparation method of the sub-peritectic steel, the operation details of a continuous casting process, particularly the cooling intensity of a crystallizer, the flow rate of protective slag of the crystallizer, the flow rate of argon of the crystallizer and the steel passing amount of the crystallizer are controlled, a slab with excellent tissue performance is obtained through continuous casting, a certain temperature is ensured after the slab is discharged out of a heating furnace through controlling the operation details of a hot rolling process, then a middle slab is chamfered to be matched with the width reducing amount through a width fixing machine, the metal temperature dropping speed of the side part of the middle slab is slowed down, and the rough rolling process is ensured to be performed above a high-temperature brittle zone; the quality of the edge of the intermediate blank is further improved through vertical roll lubrication; by fine control in continuous casting and hot rolling, high-quality raw materials with fewer defects are provided for the cold rolling process, so that the edge quality of the prepared sub-peritectic steel product is effectively ensured. Compared with the existing defect removal method, the defect removal method has the advantages that yield loss is reduced, large-scale equipment is not added, the cost is low, the operation is convenient and flexible, the defects can be greatly reduced, and the qualification rate and the yield are improved.
As an alternative embodiment, the controlling the cooling intensity of the crystallizer to be a preset intensity includes:
controlling the cooling intensity of the broad surface of the cooling water of the crystallizer to be 1120-1140NL/min/t;
controlling the cooling strength of the narrow surface of the cooling water of the crystallizer to be 150-160NL/min/t.
The reason for controlling the cooling intensity of the crystallizer is that: after the cooling strength is improved, the casting blank structure is thinned, carbide is dispersed, the steel strength and the deformation resistance in the hot rolling process are obviously improved, and the defect of the fine line at the edge is relieved; the cooling strength is not too high, which increases the cracking tendency of the cast slab, and the amount of steel to be passed is limited.
As an alternative embodiment, the basicity of the low carbon steel mold flux is 0.9 to 0.95, the melting temperature of the low carbon steel mold flux is 1050 ℃, and the melting speed of the low carbon steel mold flux is 30 to 40s.
The adoption of the low-carbon steel covering slag has the advantages that: the heat transfer is quickened, and the refinement and uniformity of crystal grains are facilitated; in addition, the low-carbon casting powder has low viscosity, small friction resistance with the crystallizer and good lubricating effect.
As an optional implementation manner, the controlling the argon flow of the crystallizer to be in a preset state includes:
controlling the flow rate of the argon of the crystallizer stopper rod to be 3.0-3.4NL/min;
controlling the argon flow of the upper water gap of the crystallizer to be 3.0-3.4NL/min;
controlling the argon flow between the crystallizer plates to be 5.0-5.4NL/min.
The argon blowing at three places has the advantages that: the tundish is sealed by blowing argon in the place where the tundish is possibly contacted with air, so that the protection effect is good.
The advantages of respectively controlling the flow of the argon at three positions are that: the stopper rod and the water inlet adopt smaller flow control, which is beneficial to reducing the influence of argon flow on the fluctuation of the liquid level of the crystallizer; the positive pressure can be formed by adopting larger flow between the plates, so that air is prevented from being sucked in and molten steel is prevented from being polluted.
As an optional implementation manner, the controlling the steel passing amount of the crystallizer to be a preset steel passing amount includes:
controlling the section width of the crystallizer to be less than or equal to 1600mm, and controlling the steel passing amount of the casting crystallizer to be less than or equal to 3.85t/min;
controlling the section width of the crystallizer to be less than or equal to 1400mm, and controlling the steel passing amount of the casting crystallizer to be less than or equal to 3.62t/min.
The reason for controlling the steel flux is as follows: the fluctuation of the liquid level is larger when the steel passing amount is too large, the casting powder is easy to be involved, and the longitudinal crack defect is easy to be generated when the heat flow is not transferred uniformly.
As an alternative embodiment, the preset temperature is greater than or equal to 1030+. DELTA.T, wherein: delta T is the rough rolling temperature drop.
The reason for controlling the preset temperature is that: below this temperature, the corner metal tends to fall into the high temperature brittle zone during rough rolling deformation.
As an alternative embodiment, the chamfering amount of the width-fixing machine is 40mm, and the chamfering depth of the width-fixing machine is 20mm.
As an alternative embodiment, the concentration of the lubricating oil for the vertical roll lubrication is more than or equal to 0.3 percent.
The reason why the vertical roll lubrication improves the quality of the edge part of the intermediate blank is that: the vertical roller lubrication can improve the contact between the vertical roller and the edge of the strip steel, and is beneficial to relieving the occurrence of linear defects of the edge.
As an alternative embodiment, the preset amount of reduction is 50-150mm.
The reason for controlling the preset amount of widening to 50-150 is that: the width reducing machine with too small width reducing amount is not put into use, and the chamfering effect cannot be achieved; the width reduction is too large, linear defects are far away from the edge, and the trimming in the later working procedure cannot be eliminated.
According to another exemplary embodiment of the present invention, there is also provided a peritectic steel prepared by any one of the preparation methods of the peritectic steel.
The present application will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
The embodiment provides a preparation method of sub-peritectic steel, which comprises smelting, continuous casting, hot rolling, coiling and cold rolling;
and (3) continuous casting:
the cooling strength of the wide surface of the cooling water of the crystallizer is 1120NL/min/t, and the cooling strength of the narrow surface is 150NL/min/t; the mold flux of the crystallizer adopts low-carbon steel mold flux, the alkalinity of the low-carbon steel mold flux is 0.9, the melting temperature is 1050 ℃, and the melting speed is 30s; the argon flow of a crystallizer stopper rod is 3NL/min, the argon flow of a water inlet is 3NL/min, and the argon flow between plates is 5NL/min; casting the crystallizer for times with the section width of the crystallizer less than or equal to 1600mm, wherein the steel passing amount of the crystallizer is 3.85t/min; the section width of the crystallizer is less than or equal to 1400mm, and the steel passing amount of the casting crystallizer is 3.62t/min;
when hot rolling, the following steps:
the tapping temperature of the heating before hot rolling is 1180 ℃; chamfering by adopting a width-fixing machine, wherein the chamfering amount is 40mm, and the chamfering depth is 20mm; vertical roll lubrication is adopted, and the concentration of lubricating oil is 0.3%; the reduction of the hot rolling was 50mm.
The peritectic steel is prepared by adopting the preparation method of the peritectic steel.
Example 2
The embodiment provides a preparation method of sub-peritectic steel, which comprises smelting, continuous casting, hot rolling, coiling and cold rolling;
and (3) continuous casting:
the cooling strength of the wide surface of the cooling water of the crystallizer is 1130NL/min/t, and the cooling strength of the narrow surface is 155NL/min/t; the mold flux of the crystallizer adopts low-carbon steel mold flux, the alkalinity of the low-carbon steel mold flux is 0.92, the melting temperature is 1050 ℃, and the melting speed is 35s; the argon flow of a crystallizer stopper rod is 3.2NL/min, the argon flow of a water inlet is 3.2NL/min, and the argon flow between plates is 5.2NL/min; casting the crystallizer for times with the section width of the crystallizer less than or equal to 1600mm, wherein the steel passing amount of the crystallizer is 3.75t/min; casting the crystallizer for times with the section width of the crystallizer less than or equal to 1400mm, wherein the steel passing amount of the crystallizer is 3.50t/min;
when hot rolling, the following steps:
the tapping temperature of heating before hot rolling is 1200 ℃; chamfering by adopting a width-fixing machine, wherein the chamfering amount is 40mm, and the chamfering depth is 20mm; vertical roll lubrication is adopted, and the concentration of lubricating oil is 0.35%; the reduction of the hot rolling was 100mm.
The peritectic steel is prepared by adopting the preparation method of the peritectic steel.
Example 3
The embodiment provides a preparation method of sub-peritectic steel, which comprises smelting, continuous casting, hot rolling, coiling and cold rolling;
and (3) continuous casting:
the cooling strength of the wide surface of the cooling water of the crystallizer is 1140NL/min/t, and the cooling strength of the narrow surface is 160NL/min/t; the mold flux of the crystallizer adopts low-carbon steel mold flux, the alkalinity of the low-carbon steel mold flux is 0.95, the melting temperature is 1050 ℃, and the melting speed is 40s; the argon flow of a crystallizer stopper rod is 3.4NL/min, the argon flow of a water inlet is 3.4NL/min, and the argon flow between plates is 5.4NL/min; casting the crystallizer for times with the section width of the crystallizer less than or equal to 1600mm, wherein the steel passing amount of the crystallizer is 3.65t/min; casting the crystallizer for times with the section width of the crystallizer less than or equal to 1400mm, wherein the steel passing amount of the crystallizer is 3.40t/min;
when hot rolling, the following steps:
the tapping temperature of heating before hot rolling is 1220 ℃; chamfering by adopting a width-fixing machine, wherein the chamfering amount is 40mm, and the chamfering depth is 20mm; vertical roll lubrication is adopted, and the concentration of lubricating oil is 0.40%; the reduction of the hot rolling was 150mm.
The peritectic steel is prepared by adopting the preparation method of the peritectic steel.
Comparative example
The preparation method of the peritectic steel comprises smelting, continuous casting, hot rolling, coiling and cold rolling;
and (3) continuous casting:
the cooling strength of the wide surface of the cooling water of the crystallizer is 760NL/min/t, and the cooling strength of the narrow surface is 125NL/min/t; the mold flux of the crystallizer adopts low-carbon steel mold flux, the alkalinity of the low-carbon steel mold flux is 1.35, the melting temperature is 1100 ℃, and the melting speed is 50s; the argon flow of a crystallizer stopper rod is 3.4NL/min, the argon flow of a water inlet is 3.4NL/min, and the argon flow between plates is 5.4NL/min; casting the crystallizer for times with the section width of the crystallizer less than or equal to 1600mm, wherein the steel passing amount of the crystallizer is 3.6t/min; casting the crystallizer for times with the section width of the crystallizer less than or equal to 1400mm, wherein the steel passing amount of the crystallizer is 3.35t/min;
when hot rolling, the following steps:
the tapping temperature of the heating before hot rolling is 1160 ℃; chamfering by adopting a width-fixing machine, wherein the chamfering amount is 40mm, and the chamfering depth is 20mm; vertical roll lubrication is adopted, and the concentration of lubricating oil is 0.40%; the reduction of the hot rolling was 200mm.
The peritectic steel is prepared by adopting the preparation method of the peritectic steel.
Experimental example
The edge quality test was carried out on the peritectic steels prepared by the preparation methods provided in examples 1 to 3 and comparative examples, and specific results are shown in the following table.
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Rate of edge quality degradation | ≤0.20％ | ≤0.05％ | ≤0.10％ | 1.09％ |
As can be seen from the table above, the quality of the edge of the sub-peritectic steel prepared by the preparation method of the embodiment 1-3 of the application is obviously better than that of the comparative example, compared with the prior art, the quality of the edge is obviously improved, the yield loss is reduced, large-scale equipment is not increased, the cost is low, the operation is convenient and flexible, the defect is greatly reduced, and the qualification rate and the yield are improved.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (2)
1. The preparation method of the peritectic steel is characterized by comprising smelting, continuous casting, hot rolling, coiling and cold rolling;
and during continuous casting:
controlling the cooling intensity of the crystallizer to be preset intensity;
the mold flux of the crystallizer adopts low-carbon steel mold flux;
controlling the argon flow of the crystallizer to be in a preset state;
controlling the steel passing amount of the crystallizer to be a preset steel passing amount;
the hot rolling is as follows:
controlling the tapping temperature heated before hot rolling to be a preset temperature;
chamfering by adopting a width fixing machine;
vertical roll lubrication is adopted;
controlling the width reduction of the hot rolling to be a preset width reduction;
the controlling the cooling intensity of the crystallizer to be the preset intensity comprises the following steps:
controlling the cooling intensity of the broad surface of the cooling water of the crystallizer to be 1120-1140NL/min/t;
controlling the cooling strength of the narrow surface of the cooling water of the crystallizer to be 150-160NL/min/t;
the controlling the steel passing amount of the crystallizer to be the preset steel passing amount comprises the following steps:
controlling the section width of the crystallizer to be less than or equal to 1600mm, and controlling the steel passing amount of the casting crystallizer to be less than or equal to 3.85t/min;
controlling the section width of the crystallizer to be less than or equal to 1400mm, and controlling the steel passing amount of the casting crystallizer to be less than or equal to 3.62t/min;
the preset temperature is more than or equal to 1030+ [ delta ] T, wherein: delta T is the rough rolling temperature drop;
the chamfering amount of the width fixing machine is 40mm, and the chamfering depth of the width fixing machine is 20mm;
the concentration of lubricating oil for vertical roll lubrication is more than or equal to 0.3%;
the preset width reduction is 50-150mm;
the alkalinity of the low-carbon steel protecting slag is 0.9-0.95, and the melting temperature of the low-carbon steel protecting slag is 1050 ℃;
the controlling the argon flow of the crystallizer to be in a preset state comprises:
controlling the flow rate of the argon of the crystallizer stopper rod to be 3.0-3.4NL/min;
controlling the argon flow of the upper water gap of the crystallizer to be 3.0-3.4NL/min;
controlling the argon flow between the crystallizer plates to be 5.0-5.4NL/min.
2. A peritectic steel prepared by the preparation method of the peritectic steel according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210930688.8A CN115354205B (en) | 2022-08-04 | 2022-08-04 | Preparation method of peritectic steel and peritectic steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210930688.8A CN115354205B (en) | 2022-08-04 | 2022-08-04 | Preparation method of peritectic steel and peritectic steel |
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