CN117127113A - Side guide plate lining plate for hot continuous rolling and production method thereof - Google Patents
Side guide plate lining plate for hot continuous rolling and production method thereof Download PDFInfo
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- CN117127113A CN117127113A CN202311399545.XA CN202311399545A CN117127113A CN 117127113 A CN117127113 A CN 117127113A CN 202311399545 A CN202311399545 A CN 202311399545A CN 117127113 A CN117127113 A CN 117127113A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000002245 particle Substances 0.000 claims abstract description 42
- 239000011159 matrix material Substances 0.000 claims abstract description 38
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 33
- 239000012535 impurity Substances 0.000 claims abstract description 29
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 15
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 14
- 238000011065 in-situ storage Methods 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 114
- 239000010959 steel Substances 0.000 claims description 114
- 238000010438 heat treatment Methods 0.000 claims description 32
- 238000007670 refining Methods 0.000 claims description 19
- 239000007769 metal material Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000008520 organization Effects 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 239000011651 chromium Substances 0.000 description 15
- 230000003647 oxidation Effects 0.000 description 14
- 238000007254 oxidation reaction Methods 0.000 description 14
- 238000005299 abrasion Methods 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 239000000956 alloy Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
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- 229910052742 iron Inorganic materials 0.000 description 5
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- 238000013461 design Methods 0.000 description 3
- 238000007373 indentation Methods 0.000 description 3
- 238000004372 laser cladding Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- 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
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/028—Slabs
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention provides a side guide plate lining plate for hot continuous rolling and a production method thereof, relating to the field of metallurgical materials; the lining plate comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurity comprises H less than or equal to 0.00015%, P less than or equal to 0.010%, S less than or equal to 0.002%,o is less than or equal to 0.0025 percent, and N is less than or equal to 0.005 percent; the side guide plate lining board comprises a ferrite matrix and TiB which is generated in situ and uniformly distributed in the matrix 2 Particles, tiB is organized by soft phase organization ferrite matrix and hard phase organization 2 And the combination of the particles effectively improves the overall wear resistance of the side guide plate lining plate.
Description
Technical Field
The invention relates to the technical field of metallurgical materials, in particular to a side guide plate lining plate for hot continuous rolling and a production method thereof.
Background
The hot continuous rolling mill has the characteristics of high rolling speed and high efficiency, and is widely applied to production. In order to prevent the problem of coil shape caused by the horizontal sliding of the hot rolled sheet moving at high speed, side guide plates are usually provided between the finishing mill group and the coiler to restrict the horizontal sliding of the hot rolled sheet, so that the hot rolled sheet is fed into the pinch rolls in alignment with the rolling center line, and the side guide plates clamp the hot rolled sheet when entering the pinch rolls to reduce the tower shape of the steel coil.
The side guide plate is a loss piece, the working environment is very bad, and due to the fact that high-temperature oxidation and abrasion exist simultaneously, deep grooves are formed on the surface of the side guide plate, and therefore the whole component is scrapped. In order to improve replacement efficiency and reduce cost, a layer of lining plate is generally added on one side of a side guide plate, which is contacted with a steel plate, in a welding or mechanical connection mode, and only the lining plate is replaced after the lining plate is worn to a certain degree. The lining board is generally made of high-hardness materials such as wear-resistant steel, die steel and the like to reduce wear, or is subjected to surface hardening by adopting a laser cladding mode. The wear-resistant steel and the die steel are adopted as the lining plates, the materials are convenient to obtain and low in cost, but the materials are seriously oxidized at high temperature, and the hot rolled plate moving at high speed and the lining plates are subjected to opposite grinding to form sharp grooves, so that the surface of the coiled plate is easily scratched; the mode of reducing the abrasion of the lining plate by cladding ceramic particles with laser is adopted, although the abrasion resistance of the lining plate is improved, the abrasion is easy to cause the abrasion of the surface of a coiled plate formed by ceramic falling off, the laser cladding cost is high, the repairing period is long, and special equipment is expensive.
Based on the wear-resisting requirement and cost control of the current lining plate, a new lining plate manufacturing process needs to be provided to meet the application target.
Disclosure of Invention
The invention aims to provide a side guide plate lining plate for hot continuous rolling and a production method thereof, wherein high-strength and high-melting-point TiB is generated in situ in a ferrite matrix of the side guide plate lining plate through composition and process design 2 The particles enable the side guide plate lining plate to have the characteristics of high temperature resistance and abrasion resistance, and the industrial production is easy.
In order to achieve the above purpose, the present invention proposes the following technical scheme:
in a first aspect, the present solution provides a side guide plate lining plate for hot continuous rolling, which comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurity comprises less than or equal to 0.00015 percent of H, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0025 percent of O and less than or equal to 0.005 percent of N.
Further, the side guide plate lining plate comprises the following chemical components in percentage by mass: c:0.045%, mn:0.5%, cr:12%, ni:8%, ti:6%, B:2.5%, co:8%, the balance being Fe and unavoidable impurities; the impurity comprises less than or equal to 0.00015 percent of H, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0025 percent of O and less than or equal to 0.005 percent of N.
Further, the microstructure of the lining plate comprises a ferrite matrix and TiB which grows in situ in the ferrite matrix 2 Particles of TiB 2 The particles are uniformly distributed in the ferrite matrix.
Further, tiB in the lining plate 2 The mass fraction of the particles is 6% -11%.
In a second aspect, the present solution provides a method for producing a side guide liner plate for hot continuous rolling, including the following steps:
s1: smelting and refining by using a vacuum induction furnace to obtain molten steel with target content, and pouring to obtain a steel ingot; wherein, the molten steel with the target content comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurities comprise H less than or equal to 0.00015%, P less than or equal to 0.010%, S less than or equal to 0.002%, O less than or equal to 0.0025% and N less than or equal to 0.005%;
s2: peeling the prepared steel ingot, heating to remove phosphorus, and rolling to obtain a steel plate;
s3: sampling and processing the steel plate to obtain a side guide plate lining plate;
wherein the microstructure of the lining plate comprises a ferrite matrix and TiB which grows in situ in the ferrite matrix 2 Particles of TiB 2 The particles are uniformly distributed in the ferrite matrix.
Further, in the step S1, the process of obtaining the molten steel with the target content by smelting and refining by using a vacuum induction furnace and obtaining the steel ingot by casting comprises the following steps:
obtaining molten steel materials, starting refining at 1570-1620 ℃ for 10min, stopping heating at the end of refining, and then filling 50KPa argon;
after the surface of the molten steel is stable, firstly adding metal Mn to regulate the fluidity of the molten steel, restarting heating, and after the metal Mn is completely melted, adding a target component metal material to regulate the components of the molten steel;
finally, adding a metal material containing element Ti and a metal material containing element B into the molten steel, and regulating the temperature of the molten steel to 1520-1550 ℃ after the metal material is completely melted, and pouring to form a steel ingot; the molten steel poured into the steel ingot comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurity comprises less than or equal to 0.00015 percent of H, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0025 percent of O and less than or equal to 0.005 percent of N.
Further, the heating conditions after peeling the steel ingot in the step S2 are as follows: the steel ingot is peeled and charged into a furnace and heated to 900-950 ℃ and then is preserved for 300-420 min.
Further, the particle hardness of the ferrite matrix in the steel plate is 4-4.5 GPa; the TiB is 2 The particles form a hard phase of the microstructure of the steel plate, and the particle hardness of the hard phase is not lower than 6GPa.
Further, the rolling pass reduction rate in the step S2 is 5% -8%.
Further, after the steel ingot is cast and molded, the heat preservation in the vacuum induction furnace is carried out for not less than 3 hours.
According to the technical scheme, the following beneficial effects are achieved:
the invention discloses a side guide plate lining plate for hot continuous rolling and a production method thereof, wherein the lining plate comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurities comprise H less than or equal to 0.00015%, P less than or equal to 0.010%, S less than or equal to 0.002%, O less than or equal to 0.0025% and N less than or equal to 0.005%; the side guide plate lining plate comprises a ferrite matrix and 6% -11% of TiB generated in situ in the matrix on microcosmic scale 2 Particles, tiB is organized by soft phase organization ferrite matrix and hard phase organization 2 And the combination of particles effectively improves the overall wear resistance of the side guide plate lining plate, and further remarkably prolongs the service life of the side guide plate lining plate.
The side guide plate lining plate prepared by the invention has the dual characteristics of high-temperature oxidation resistance and impact resistance; specifically, according to the scheme, a small amount of C, mn atoms are added, so that the generated soft phase structure ferrite matrix has good plasticity and toughness, and the matrix has low hardness and good plasticity, so that the impact resistance of the material is improved in the process of contacting the lining plate with the steel plate, and the lining plate can be effectively deformed to avoid scratch on the surface of the steel plate caused by the high-hardness lining plate in severe collision; meanwhile, in order to keep good oxidation resistance of the material at high temperature, the material forms a compact oxide film by adding Ni and Cr, so that the stability of the material is effectively improved, the material loss caused by oxidation corrosion is avoided, and the material failure caused by high-temperature wear is reduced.
In addition, the side guide plate lining plate for hot continuous rolling disclosed by the invention is simple to produce, so that the side guide plate lining plate can be produced in batches and is widely applied.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the invention, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the invention.
Drawings
The drawings are not intended to be drawn to scale with respect to true references. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a metallurgical structure of a steel sheet according to example 1 of the present invention;
FIG. 2 is a metallurgical structure of a steel sheet according to example 2 of the present invention;
FIG. 3 is a graph showing nanoindentation test data of a steel sheet according to example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Also, unless the context clearly indicates otherwise, singular forms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "comprises," "comprising," or the like are intended to cover a feature, integer, step, operation, element, and/or component recited as being present in the element or article that "comprises" or "comprising" does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
Although the mode of protecting the side baffle by the lining plate is adopted in the hot continuous rolling process, the loss rate of the side baffle and the cost of the whole component are effectively reduced, the lining plate has some problems in the application process; for example, when wear-resistant steel or die steel is used as a lining plate, the problem that sharp grooves are formed in the surface of the lining plate in application and the surface of a coiled plate is scratched easily occurs; for another example, the manner of improving the wear resistance of the lining plate by adopting laser cladding has high cost, and the problem that the ceramic falls off and scratches the surface of the plate coil due to friction can occur. The present invention aims to solve the above problems and provides a method for preparing a microstructure from ferrite matrix structure and in-situ generation of TiB therein by composition and process design 2 The side guide plate lining plate formed by the grain structure not only has the characteristics of high temperature resistance and wear resistance, but also is easy for industrial production.
The invention discloses a production method of a side guide plate lining plate for hot continuous rolling, which comprises the following steps:
s1: smelting and refining by using a vacuum induction furnace to obtain molten steel with target content, and pouring to obtain a steel ingot; wherein, the molten steel with the target content comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurities comprise H less than or equal to 0.00015%, P less than or equal to 0.010%, S less than or equal to 0.002%, O less than or equal to 0.0025%, and N less than or equal to 0.005%:
s2: peeling the prepared steel ingot, heating to remove phosphorus, and rolling to obtain a steel plate; wherein the rolling pass reduction is 5-8%, because the alloy of the material is high and the deformation resistance is large, in order to effectively ensureThe plate shape and the rolling reduction are not excessively large; the microstructure of the steel plate comprises a ferrite matrix and TiB which grows in situ in the ferrite matrix 2 Particles of TiB 2 The particles are uniformly distributed in the ferrite matrix, and TiB in the lining plate 2 The mass fraction of the particles is 6% -11%;
s3: and (5) sampling and processing the steel plate to obtain the side guide plate lining plate.
According to the scheme, a small amount of C, mn atoms are added, so that a soft-phase ferrite matrix is generated, and the ferrite matrix has good plasticity and toughness; uniformly distributed TiB 2 The particles on the ferrite matrix effectively improve the overall wear resistance of the side guide plate lining plate. In the process of contacting the side guide plate lining plate with the steel plate, the substrate has low hardness and good plasticity, can effectively deform during severe collision to avoid scratch on the surface of the steel plate caused by the side guide plate lining plate with high hardness, and meanwhile, the hard TiB is distributed on the ferrite substrate 2 Particles can remain on the surface of the side guide plate lining plate after the ferrite matrix is worn, so that the overall wear resistance of the side guide plate lining plate is realized. The invention uses the ferrite matrix of the soft phase and the TiB of the hard phase 2 The particles are combined, the particle hardness of the soft phase is 4-4.5 GPa, and the particle hardness of the hard phase is not lower than 6GPa, so that the problems of surface scratch of the steel plate and low service life of the common steel plate caused by the lining plate made of wear-resistant steel are effectively solved. In addition, in order to maintain good oxidation resistance and high-temperature strength of the side guide plate lining plate at high temperature, a small amount of Ni and Cr alloy is added in the formula components, and a compact oxide film is formed by using Ni and Cr, so that the stability of the material is effectively reduced, and the material loss caused by oxidation corrosion is avoided; in addition, a small amount of Co ensures the high-temperature strength of the material and reduces the material failure caused by high-temperature wear.
The above alloy elements function as follows:
c: the hardness of the material and the high-hardness eutectic carbide in the tissue play an important role in the abrasion resistance of the side guide plate lining plate, and the hardness of the material should be improved in order to improve the normal-temperature abrasion resistance; however, the abrasion of the high-temperature abrasive particles is not only affected by the abrasive particles, but also the oxidation corrosion of the high-temperature gas to the material, so that the carbon content is as low as possible during high-temperature use, and the mass percentage of the element C is controlled to be not more than 0.05% in order to achieve the cost and the use effect.
Cr: cr element strengthens ferrite matrix through solid solution, and the Cr element can inhibit brittle pistil-shaped and dendritic primary eutectic TiB 2 Particle generation, which is detrimental to toughness; meanwhile, too low Cr content is unfavorable for the formation of oxide film, but too high Cr is liable to be formed (Fe, cr) 2 B brittle phase is detrimental to the improvement of fracture toughness; the method combines oxidation resistance and fracture toughness, and the mass percentage of Cr element is controlled to be 10-15%.
Mn: mn element replaces Ni, so that the interatomic binding force is improved, the stability of austenite is improved, the cost is reduced, the oxidation corrosion resistance is reduced, and the mass percent of Mn element is 0.2-0.5% by combining the above factors.
Co: the heat resistance, the high-temperature wear resistance and the high-temperature strength of the material can be effectively improved by improving the Co content, but Co is noble metal, and the cost of the material can be greatly improved by excessive addition; in order to obtain an effective result and avoid excessively high cost, the mass percentage of Co element in the scheme is 5-10%.
B. Ti: the B element and Ti element react in situ in molten steel to generate TiB 2 Reinforcing particles of (a); proper quantity and uniform distribution of primary TiB 2 The particles well bear additional load for the matrix and resist deformation; while coarse and excessive TiB 2 The particles and the matrix cannot be deformed in a coordinated way, and cracks are easy to initiate at interfaces with weak binding force of the particles and the matrix; therefore, the content of B element and Ti element needs to be controlled, wherein in the scheme, the mass percent of B element is 2-3.5%, and the mass percent of Ti element is 5-8%.
In conclusion, the side guide plate lining plate for hot continuous rolling prepared by adopting the formula disclosed by the invention has the advantages that on one hand, the high-temperature oxidation resistance of the lining plate is effectively improved by low-C design and adding a proper amount of Cr and Co elements; on the other hand TiB is obtained by proper addition of B, ti element 2 The particles strengthen the wear resistance, and the comprehensive performance of the side guide plate lining plate is improved through controlling gas and harmful impurities.
In the step S1, the process of obtaining the molten steel with the target content by smelting and refining by using a vacuum induction furnace and obtaining the steel ingot by casting specifically comprises the following steps:
obtaining molten steel materials, starting refining at 1570-1620 ℃ for 10min, stopping heating at the end of refining, and then filling 50KPa argon;
after the surface of the molten steel is stable, metal Mn is added to regulate the fluidity of the molten steel and heating is restarted, and after the metal Mn is completely melted, a target component metal material is added to regulate the components of the molten steel; the target component metal material is mainly Co alloy small powder and a fully melted target component specification small powder which is added by sampling;
finally, adding a metal material containing element Ti and a metal material containing element B into molten steel, regulating the temperature of the molten steel after the metal material is completely melted, namely, the molten steel with target content is poured at 1520-1550 ℃, forming a steel ingot, and preserving heat for not less than 3 hours in the vacuum induction furnace after the steel ingot is poured and formed; the molten steel poured into the steel ingot comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurity comprises less than or equal to 0.00015 percent of H, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0025 percent of O and less than or equal to 0.005 percent of N.
The refining function is to alloy the material in order to remove the gas in the molten steel. The Ti element and the B element are easy-to-burn elements, and the volatilization of the elements is effectively avoided by adding the elements in the later period of refining, so that the proportion of in-situ synthesized hard phases is ensured; the steel ingot is slowly cooled by utilizing long-time heat preservation in the vacuum induction furnace, so that surface cracks caused by stress can be effectively avoided.
The molten steel material is obtained by the following steps: charging, namely firstly, charging metal chromium, nickel plates and industrial pure iron into a cleaned crucible, wherein the materials which are firstly charged into the crucible are components which occupy higher mass of alloy materials, and are materials which are not easy to burn and deoxidize; heating and melting, slowly heating, and starting to increase the heating speed until the molten steel appears at the bottom of the crucible, wherein the heating curve in the melting period is 30KW/h (30 min) -40KW/h (10 min) -50KW/h (5 min) -55KW/h (5 min) -60KW/h-70KW/h (5 min) -80KW/h (heating to 1570 ℃ when the material is melted to the full melting).
The conditions for heating the prepared steel ingot after peeling in the step S2 are as follows: heating in a furnace, and preserving heat for 300-420 min after heating to 900-950 ℃; the defects of warping, bending and the like caused by deformation of the steel plate in the rolling process can be avoided by fully heating the steel plate before rolling. The scheme controls the heating temperature to 900-950 ℃, and aims to prevent the heating temperature from being too high, and the volatilization of B element on the surface of the steel plate is easy to cause when the heating temperature is too high, so that the surface wear resistance is reduced; the heating temperature is too low, the deformation resistance of the material is large, deformation cannot penetrate into the core just before during rolling, grains cannot be effectively broken, the toughness of the core is poor, and impact failure is easily caused in the use process of the steel plate.
The side guide lining board for hot continuous rolling and the production method thereof disclosed by the invention are further specifically described below with reference to the specific embodiments shown in the drawings.
Example 1
1. And (2) charging: firstly, placing metallic chromium, nickel plates and industrial pure iron into a cleaned crucible; the materials which are firstly filled into the crucible are materials which occupy higher alloy material quality and are not easy to burn and damage, and deoxidized materials.
2. Heating and melting: slowly heating, and starting to increase the heating speed until the molten steel appears at the bottom of the crucible, wherein the heating curve in the melting period is 30KW/h (30 min) -40KW/h (10 min) -50KW/h (5 min) -55KW/h (5 min) -60KW/h-70KW/h (5 min) -80KW/h (fully melting to 1570 ℃), and the materials are fully melted.
3. Refining and pouring: heating to 1600 ℃ after the materials are fully melted, starting refining, keeping for 10min in the refining period, stopping heating at the end of refining, then charging 50KPa argon, adding Mn to regulate the fluidity of molten steel after the surface of the molten steel is stable, starting heating after Mn is added, adding other alloy small materials (Co) small materials after the materials are fully melted, and sampling and supplementing the specification small materials after the materials are fully melted. The refining stage is used for removing gas in molten steel and alloying materials.
4. And finally, weighing and adding Ti iron and B iron according to a proportion after the sampling components meet the requirements, regulating the temperature of molten steel to 1535 ℃ after the materials are fully melted for 5 minutes, pouring, stopping power after pouring, and cooling and preserving the heat of the steel ingot along with a furnace for 4 hours.
5. Charging into a furnace, heating to 920 ℃, and preserving heat for 350min; and after the steel plate is discharged from the furnace, dephosphorizing, rapidly rolling steel, and rolling for 7 times, wherein the thickness of the steel plate is 37mm, and the pass reduction rates are 8%, 7%, 6% and 5% in sequence.
The steel plate prepared by the process comprises the following chemical components in percentage by mass: c:0.045%, mn:0.5%, cr:12%, ni:8%, ti:6%, B:2.5%, co:8% of Fe and unavoidable impurities, wherein the impurities comprise less than or equal to 0.00015% of H, less than or equal to 0.010% of P, less than or equal to 0.002% of S, less than or equal to 0.0025% of O and less than or equal to 0.005% of N; the metallographic structure of the steel plate is shown in FIG. 1, calculated by image-pro software, tiB 2 The mass percentage of the particles is 7.5%. The hardness of the steel plate is detected by adopting a nanoindentation instrument, and the result is shown in figure 3, wherein the particle hardness of the soft-phase ferrite matrix is 4-4.5 GPa, and the hard-phase TiB 2 The particle hardness of the particles can reach 7GPa.
Example 2
Example 2 differs from example 1 only in the chemical composition of the steel sheet produced, and the steel sheet produced in example 2 comprises, in mass percent: c:0.035%, mn:0.38%, cr:14%, ni:6%, ti:7%, B:3.2%, co:6 percent, the balance of Fe and unavoidable impurities, wherein the impurities comprise less than or equal to 0.00015 percent of H, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0025 percent of O and less than or equal to 0.005 percent of N; the metallographic structure of the steel sheet is shown in FIG. 2.
As shown in the combination of figures 1 and 3, the hardness of the hard phase of the side baffle lining plate is obviously higher than that of the ferrite matrix of the soft phase, the soft phase provides a buffer effect in the impact process, the scratch of the surface of a steel plate is avoided, and the hard phase ensures the wear resistance of the material.
In addition, in order to further illustrate the effect of chemical components on the performance of the lining plate of the side guide plate of the finished product, the steel plates with different components are obtained by disclosing the examples and the comparative examples shown in the following table 1, and the important disclosure is to illustrate the content of Cr element and the effect of Ti and B elements on the performance of the material; wherein, example 3 and comparative examples 1 to 4 examine the influence of Cr content on the properties of the steel sheet as Cr content increases, and example 3 and comparative examples 5 to 7 examine the influence of Ti content on the properties of the steel sheet as Ti content increases.
Table 1 shows the elemental content data for example 3 and comparative examples 1 to 7
The fracture toughness was calculated from the Evans model by taking a micrograph of the indentation of each steel plate by microscopy. The relationship between fracture toughness (Kc) and crack length (l) is as follows:. Where Kc1 is fracture toughness, P is the applied indentation load (N), a is the indentation half-diagonal (m), and l is the crack length (m).
Referring to national standard method for measuring oxidation resistance of Steel (GB/T13303-91), the weight gain per unit area (DeltaW) is calculated according to the following formula:. Wherein: m is m 2 For the sum of sample and container weight (mg), m before the test 1 The sum of the sample and the container after the test (mg), S is the original surface area (cm) 2 )。
The oxidation rate is calculated as follows:. Wherein:Kis the change of mass per unit area per unit time (g/m 2 ·h)，m 4 The sum of the sample and the container (mg) after the test of 60 h,m 3 the sum of the sample and the container (mg) after the test of 100 h,Soriginal surface area (cm) of sample 2 )。
Table 2 shows the results of 900 ℃ oxidation of the experimental as-cast samples of examples 1-3 and comparative examples 1-7
As can be seen from the examples in combination with the table 2, as the Cr content increases, the oxidation resistance of the material increases, but when the Cr content reaches 19.81% in comparative example 4, the fracture toughness decreases. While the Ti content is increased, the hardness is increased significantly, but excessive Ti causes a decrease in fracture toughness.
The side baffle lining plate obtained by the invention is applied to a side guide plate of a hot continuous rolling mill for durability detection; compared with the side guide plate lining plate made of wear-resistant steel in the prior art, the service life of the side guide plate lining plate in the scheme is prolonged from 3 days to 5 days, and the service life of the lining plate is prolonged by 67%.
While the invention has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the invention is defined by the appended claims.
Claims (10)
1. The side guide plate lining plate for hot continuous rolling is characterized by comprising the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurity comprises less than or equal to 0.00015 percent of H, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0025 percent of O and less than or equal to 0.005 percent of N.
2. The side guide plate lining plate for hot continuous rolling according to claim 1, which is characterized by comprising the following chemical components in percentage by mass: c:0.045%, mn:0.5%, cr:12%, ni:8%, ti:6%, B:2.5%, co:8%, the balance being Fe and unavoidable impurities; the impurity comprises less than or equal to 0.00015 percent of H, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0025 percent of O and less than or equal to 0.005 percent of N.
3. The side guide lining plate for hot continuous rolling according to claim 1, wherein the microstructure of the lining plate comprises a ferrite matrix and TiB grown in situ in the ferrite matrix 2 Particles of TiB 2 The particles are uniformly distributed in the ferrite matrix.
4. A side guide plate lining plate for hot continuous rolling according to claim 3, wherein TiB is contained in the lining plate 2 The mass fraction of the particles is 6% -11%.
5. The production method of the side guide plate lining plate for hot continuous rolling is characterized by comprising the following steps of:
s1: smelting and refining by using a vacuum induction furnace to obtain molten steel with target content, and pouring to obtain a steel ingot; wherein, the molten steel with the target content comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurities comprise H less than or equal to 0.00015%, P less than or equal to 0.010%, S less than or equal to 0.002%, O less than or equal to 0.0025%, and N less than or equal to 0.005%:
s2: peeling the prepared steel ingot, heating to remove phosphorus, and rolling to obtain a steel plate;
s3: sampling and processing the steel plate to obtain a side guide plate lining plate;
wherein the microstructure of the lining plate comprises a ferrite matrix and TiB which grows in situ in the ferrite matrix 2 Particles of TiB 2 The particles are uniformly distributed in the ferrite matrix.
6. The method for producing a side guide lining plate for hot continuous rolling according to claim 5, wherein the process of obtaining the molten steel with the target content by smelting and refining in the S1 through a vacuum induction furnace and obtaining the steel ingot through casting comprises the following steps:
obtaining molten steel materials, starting refining at 1570-1620 ℃ for 10min, stopping heating at the end of refining, and then filling 50KPa argon;
after the surface of the molten steel is stable, firstly adding metal Mn to regulate the fluidity of the molten steel, restarting heating, and after the metal Mn is completely melted, adding a target component metal material to regulate the components of the molten steel;
finally, adding a metal material containing element Ti and a metal material containing element B into the molten steel, and regulating the temperature of the molten steel to 1520-1550 ℃ after the metal material is completely melted, and pouring to form a steel ingot; the molten steel poured into the steel ingot comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, mn: 0.2-0.5%, cr: 10-15%, ni: 5-10%, ti: 5-8%, B: 2-3.5%, co: 5-10% of Fe and the balance of unavoidable impurities; the impurity comprises less than or equal to 0.00015 percent of H, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0025 percent of O and less than or equal to 0.005 percent of N.
7. The method for producing a side guide lining plate for hot continuous rolling according to claim 5, wherein the condition for heating after the peeling of the steel ingot in S2 is as follows: the steel ingot is peeled and charged into a furnace and heated to 900-950 ℃ and then is preserved for 300-420 min.
8. The method for producing a side guide lining plate for hot continuous rolling according to claim 5, wherein the particle hardness of the ferrite matrix in the steel plate is 4-4.5 gpa; the TiB is 2 The particles form a hard phase of the microstructure of the steel plate, and the particle hardness of the hard phase is not lower than 6GPa.
9. The method for producing a side guide liner for hot continuous rolling according to claim 5, wherein the rolling pass reduction in S2 is 5% -8%.
10. The method for producing a side guide lining plate for hot continuous rolling according to claim 5, wherein the heat preservation in the vacuum induction furnace is not less than 3 hours after the steel ingot is cast and molded.
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