CN114480806A - Manufacturing method of thick TiC particle enhanced martensite wear-resistant steel plate - Google Patents
Manufacturing method of thick TiC particle enhanced martensite wear-resistant steel plate Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- 239000002245 particle Substances 0.000 title claims abstract description 25
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 114
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 238000009749 continuous casting Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000005266 casting Methods 0.000 claims abstract description 26
- 238000010583 slow cooling Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 13
- 238000007670 refining Methods 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 8
- 238000005496 tempering Methods 0.000 claims description 8
- 230000035699 permeability Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 5
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- 239000000956 alloy Substances 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 4
- 239000010955 niobium Substances 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004626 scanning electron microscopy Methods 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
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- 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
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
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- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- 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
- C21D2211/004—Dispersions; Precipitations
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- 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
- C21D2211/008—Martensite
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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
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Abstract
The invention relates to a method for manufacturing a thick TiC particle enhanced martensite wear-resistant steel plate, and belongs to the field of engineering material manufacturing. The manufacturing method comprises the following steps: converter smelting, external refining, protective casting, casting blank slow cooling, continuous casting blank heating, rolling, cooling and heat treatment. The key point of the manufacturing method is high penetration rolling and high rolling temperature; the high-permeability rolling ensures the deformation of the interior of the plate blank, so that the central defect can be rolled and healed; the improvement of the finish rolling temperature is beneficial to metal flowing, promotes the uniform distribution of TiC particles, reduces the rolling force and avoids rolling cracks. Because the steel has a large amount of micron-sized TiC particles, the grain refining effect can be ensured without strictly controlling rolling; by the process, the TiC particle reinforced martensite wear-resistant steel plate with good performance and the thickness greater than 30mm can be stably produced.
Description
Technical Field
The invention relates to a method for manufacturing a thick TiC particle enhanced martensite wear-resistant steel plate, and belongs to the technical field of engineering material manufacturing.
Background
The wear-resistant steel plate has the characteristics of high strength, high wear resistance and the like, and is widely used for manufacturing large equipment, particularly large engineering machinery, mining machinery, agricultural machinery, metallurgical machinery and the like, and the core performance of the wear-resistant steel plate is often reduced along with the increase of the thickness of the wear-resistant steel plate in the specification of the thickness of more than 30 mm.
The structure of the traditional low-alloy wear-resistant steel is usually single-phase martensite, the wear resistance of the traditional low-alloy wear-resistant steel is directly related to the hardness of a martensite matrix, and the main method for improving the wear resistance of the traditional low-alloy wear-resistant steel is to improve the carbon content and the hardness of the martensite. However, as the carbon content and hardness in steel increase, the workability and weldability of steel deteriorate seriously, making it difficult to meet equipment manufacturing-related requirements. Superhard TiC particles are introduced into a harder martensite substrate, the wear resistance is improved through the superhard TiC particles, and more excellent wear resistance is obtained under the same hardness condition. With the large-scale and high-end equipment manufacturing, the demand for wear-resistant steel plates with thick specifications is increasing. However, the steel plate has the defects of center defects and low hardness. In addition, rolling cracks are easy to occur due to the fact that the TiC particle reinforced martensite wear-resistant steel contains more TiC particles.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems in the prior art, the present invention provides a method for manufacturing a thick TiC particle-reinforced martensitic wear-resistant steel sheet.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a manufacturing method of a TiC particle enhanced martensite wear-resistant steel plate with thick specification comprises the steps of converter smelting, external refining, protective casting, casting blank slow cooling, continuous casting blank heating, high permeability rolling, cooling and heat treatment;
preferably, the high-permeability rolling adopts a medium plate mill, the rolling process adopts the high-permeability rolling to the specification of more than 30mm, and the finish rolling temperature is properly increased;
the cooling is air cooling after rolling, and the final cooling temperature of the air cooling is room temperature; then carrying out off-line heat treatment, wherein the quenching temperature is 800-950 ℃, and the heating time is 1-3 hours; the tempering temperature is 160-260 ℃, and the heat preservation time is 1-5 hours;
the martensite wear-resistant steel plate comprises the following chemical components in percentage by weight: 0.20 to 0.40%, Si: 0.20 to 0.30%, Mn: 0.50-1.00%, P is less than or equal to 0.0010%, S is less than or equal to 0.003%, Ti: 0.30-0.80%, Mo: 0.30 to 0.50%, Cr: 0.50-1.00%, B: 0.0008 to 0.002 percent of Fe and the balance of inevitable impurity elements.
In the manufacturing method, preferably, the smelting is preferably high-quality molten steel, the chemical composition of the molten steel is optimized by niobium-free vanadium microalloying, namely, the contents of Nb and V elements are not added into the steel, and certain amounts of Mo and Cr are added to improve the hardenability. Controlling the content of harmful element N, S, P in the smelting process to ensure that the content of N is less than or equal to 40 ppm; the content of S is less than or equal to 0.003 percent; the content of P is less than or equal to 0.0010 percent.
In the manufacturing method, the continuous casting billet is obtained by adopting full-process argon blowing protection casting.
In the manufacturing method, preferably, the casting blank is slowly cooled by heating in a slow cooling pit or slowly cooled in a casting blank stacking slow cooling mode; and then, the continuous casting blank enters a heating furnace for heating, the heating temperature of the continuous casting blank is 1050-1250 ℃, and the time is 3-5 hours.
In the manufacturing method, preferably, the high permeability is that after the continuous casting slab exits from the heating furnace, a high-pressure descaling device of a rolling mill is used for descaling and cooling the slab, so that the surface temperature of the continuous casting slab is 920-960 ℃, and the core temperature of the slab is 1000-1100 ℃.
In the above-described manufacturing method, two-stage rolling including rough rolling and finish rolling is preferably used for the rolling.
In the above production method, the rough rolling is preferably performed in three passes with rolling reductions of 13 to 18%, 13 to 22%, and 15 to 28%, respectively.
In the above production method, the rough rolling is preferably performed in three passes with a reduction of 14 to 16%, 15 to 19%, and 17 to 23%, respectively.
In the above production method, the finish rolling is preferably performed at a start rolling temperature of 900 to 950 ℃; and the finish rolling temperature of the finish rolling is 850-895 ℃, and the steel plate is rolled to a thick specification steel plate with the thickness of more than 30 mm.
In the above production method, the finish rolling temperature is preferably 900 to 920 ℃; the finish rolling temperature of the finish rolling is 880-890 ℃.
In the above production method, the quenching temperature is preferably 850 to 900 ℃, the heating time is preferably 1 to 3 hours, the tempering temperature is preferably 180 to 200 ℃, and the holding time is preferably 2 to 4 hours.
(III) advantageous effects
The invention has the beneficial effects that:
the invention provides a manufacturing method of a thick TiC particle reinforced martensite wear-resistant steel plate, which adopts high-penetration rolling combination to improve the finish rolling temperature and does not need to strictly control the rolling process so as to realize the stabilized industrial production of the TiC particle reinforced martensite wear-resistant steel plate with good stable production performance and the thickness of more than 30 mm.
According to the manufacturing method of the thick TiC particle reinforced martensite wear-resistant steel plate, provided by the invention, when the alloy is designed, elements such as Nb and V for refining grains do not need to be added, and a superfine-grained martensite structure can be obtained through the corresponding process, so that a guarantee is provided for obtaining good toughness and plasticity later.
In addition, the high permeability rolling of the invention enables the core performance of the steel plate to reach more than 80% of the surface, thereby ensuring the excellent performance of the whole thickness of the thick steel plate; and the higher finish rolling temperature is beneficial to the flow of TiC particles in the steel plate along with the deformation of metal and is also beneficial to obtaining good toughness and plasticity.
Drawings
FIG. 1 is an SEM photograph of the core structure of a steel sheet obtained in example 1;
FIG. 2 is an SEM photograph of the core structure of the steel sheet obtained in example 2.
Detailed Description
The method for manufacturing the TiC particle reinforced martensite wear-resistant steel plate with the thickness of more than 30mm adopts high-permeability rolling to ensure the deformation amount in the plate blank and ensure that the core defect can be rolled and healed. In addition, the finish rolling temperature is also increased, which is beneficial to metal flow, promotes the uniform distribution of TiC particles, reduces the rolling force and avoids rolling cracks. Because the steel has a large amount of micron and nanometer dual TiC particles, the grain refining effect can be ensured without strictly controlling rolling.
The invention provides a method for manufacturing a TiC particle reinforced martensite wear-resistant steel plate with the thickness greater than 30mm, which comprises the following steps: converter smelting, external refining, protective casting, casting blank slow cooling, continuous casting blank heating, high-permeability rolling, cooling and heat treatment;
preferably, the high-permeability rolling adopts a medium plate mill, the rolling process adopts the high-permeability rolling to the thickness specification of more than 30mm, and the finish rolling temperature is properly increased;
cooling is air cooling after rolling, cooling to room temperature, and carrying out centrifugal heat treatment, wherein the quenching temperature is 800-950 ℃, the heating time is 1-3 hours, the tempering temperature is 160-260 ℃, and the heat preservation time is 1-5 hours;
the martensite wear-resistant steel plate comprises the following chemical components in percentage by weight: 0.20 to 0.40%, Si: 0.20 to 0.30%, Mn: 0.50-1.00%, P is less than or equal to 0.0010%, S is less than or equal to 0.003%, Ti: 0.30-0.80%, Mo: 0.30 to 0.50%, Cr: 0.50-1.00%, B: 0.0008 to 0.002 percent of the total weight of the alloy, and the balance of Fe and inevitable impurity elements.
The smelting preferably adopts high-quality molten steel, the chemical components of the molten steel are optimized and adopt niobium-free vanadium microalloying, a certain amount of Mo and Cr are added to improve the hardenability, and the content of harmful element N, S, P is controlled; and blowing argon gas during continuous casting to obtain the continuous casting billet in a whole-process protection casting mode.
Preferably, the casting blank slow cooling adopts a slow cooling pit heating slow cooling mode or a casting blank stacking slow cooling mode; and then, heating the continuous casting blank in a heating furnace at 1050-1250 ℃ for 3-5 hours. The heating temperature is further preferably 1150-1230 ℃, so that a better effect can be achieved, on one hand, complete solid solution of alloy and microalloy elements is ensured, and on the other hand, the generation of grain coarsening caused by overhigh heating temperature can be avoided.
Further, after the continuous casting slab exits from the heating furnace, a high-pressure descaling device of a rolling mill is used for descaling and cooling the slab, so that the surface temperature of the continuous casting slab is 920-960 ℃, and the core temperature of the slab is 1000-1100 ℃.
Further, two-stage rolling, rough rolling and finish rolling, is adopted in the rolling.
Preferably, the rough rolling is performed by more than three times of rolling, and the rolling reduction is respectively 13-18%, 13-22% and 15-28%, and further preferably, the rolling reduction is respectively 14-16%, 15-19% and 17-23%.
Preferably, the start rolling temperature of finish rolling is 900-950 ℃; and the finish rolling temperature is 850-895 ℃, the steel is rolled to the thickness of 30mm or more, and the steel is air-cooled after rolling.
Further preferably, the finish rolling initial rolling temperature is 900-920 ℃; the finish rolling temperature is 880-890 ℃. The rolling in the two stages of finish rolling and rough rolling can ensure that the grain structure in the steel is further refined, thereby laying a foundation for obtaining excellent toughness and plasticity in the follow-up process.
Preferably, the quenching temperature is 850-900 ℃, the heating time is 1-3 hours, the tempering temperature is 180-200 ℃, and the heat preservation time is 2-4 hours.
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail below with reference to specific embodiments.
Example 1
The chemical composition of the TiC particle reinforced martensite wear-resistant steel plate of the embodiment is, by weight, C: 0.30%, Mn: 0.8%, Si: 0.25%, Mo: 0.40%, Ti: 0.60%, Cr: 0.80%, S is less than or equal to 0.003%, B: 0.0008 percent, less than or equal to 0.0010 percent of P, and the balance of Fe and inevitable impurity elements.
The manufacturing method adopts converter smelting, external refining, protective casting, casting blank slow cooling, continuous casting blank heating, high permeability rolling, cooling and heat treatment;
wherein, high-quality molten steel is adopted during smelting, niobium microalloying is cancelled in the optimization of chemical components, a certain amount of Mo and Cr is added to improve hardenability, and the content of harmful element N, S, P is controlled, so that the content of N is less than or equal to 40 ppm; the content of S is less than or equal to 0.003 percent; the content of P is less than or equal to 0.0010 percent; and adopting the whole-course argon blowing protection casting to obtain a continuous casting billet with the thickness of 260 mm.
The casting blank is slowly cooled by adopting a slow cooling pit for heating, and then the continuous casting blank is heated in a heating furnace at 1250 ℃ for 4 hours;
the high-permeability rolling adopts a medium plate rolling mill, the rolling process adopts high-permeability two-stage rolling, and after the continuous casting billet is taken out of a heating furnace, a high-pressure descaling device of the rolling mill is used for descaling and cooling the slab, so that the surface temperature of the continuous casting billet is 960 ℃, and the core temperature of the slab is about 1100 ℃. The rolling reduction of the rough rolling three passes is respectively 16%, 19% and 23%, and the thickness of the intermediate billet is 81 mm. The initial rolling temperature of the finish rolling is 920 ℃, the finish rolling temperature of the finish rolling is 880 ℃, and the thickness of the steel plate is rolled to be 32 mm.
Cooling and heat treatment: and air cooling is carried out after rolling, the steel plate is cooled to room temperature, then offline heat treatment is carried out on the rolled steel plate, the quenching temperature is 900 ℃, the heating time is 1 hour, the tempering temperature is 180 ℃, and the heat preservation time is 2 hours.
The mechanical properties of the obtained steel plate are measured according to a GB/T228-2002 metal material room temperature tensile test method, the low-temperature impact toughness is measured according to a GB/T229-.
TABLE 1 mechanical properties obtained for the steel sheet in example 1
The core structure of the obtained steel plate was examined by scanning electron microscopy, and the results are shown in FIG. 1. The results show that the steel plate has excellent core structure, no defects and uniform TiC particle distribution.
Example 2
The TiC particle reinforced martensite wear-resistant steel plate of the embodiment comprises the following chemical components in percentage by weight: 0.40%, Mn: 0.8%, Si: 0.25%, Mo: 0.40%, Ti: 0.60%, Cr: 0.80%, S is less than or equal to 0.003%, P is less than or equal to 0.0010%, B: 0.0012%, and the balance of Fe and inevitable impurity elements.
The manufacturing method adopts converter smelting, external refining, protective casting, casting blank slow cooling, continuous casting blank heating, high permeability rolling, cooling and heat treatment.
Wherein, high-quality molten steel is adopted during smelting, niobium microalloying is cancelled in the optimization of chemical components, a certain amount of Mo and Cr are added to improve hardenability, and the content of harmful element N, S, P is controlled; so that N is less than or equal to 40ppm, S is less than or equal to 0.003 percent and P is less than or equal to 0.0010 percent, and the continuous casting billet is obtained by adopting the whole-process argon blowing protection casting.
Casting blank slow cooling adopts a casting blank stacking slow cooling mode; when the continuous casting billet is heated, the continuous casting billet is heated in a heating furnace, the heating temperature is 1230 ℃, and the time is 4 hours.
The high-permeability rolling adopts a medium plate rolling mill, the rolling process adopts high-permeability two-stage rolling, and after the continuous casting billet is taken out of a heating furnace, a high-pressure descaling device of the rolling mill is used for descaling and cooling the slab, so that the surface temperature of the continuous casting billet is 960 ℃, and the core temperature of the slab is about 1100 ℃. The rolling reduction of the rough rolling three passes is respectively 14%, 15% and 17%, and the thickness of the intermediate billet is 120 mm. The start rolling temperature of the finish rolling is 920 ℃, the finish rolling temperature of the finish rolling is 890 ℃, and the thickness of the steel is 50 mm.
Cooling and heat treatment, air cooling after rolling, and the final cooling temperature of air cooling is room temperature. Then, the rolled steel is subjected to off-line heat treatment, wherein the quenching temperature is 900 ℃, the heating time is 2 hours, the tempering temperature is 180 ℃, and the heat preservation time is 4 hours.
The mechanical properties of the steel sheet obtained in example 2 were measured by the same test method as in example 1, and are shown in Table 2 below.
TABLE 2 mechanical properties obtained for the steel sheets in example 2
The core structure of the steel sheet obtained in this example was examined by scanning electron microscopy, and the results are shown in fig. 2. The results show that the steel plate has excellent core structure, no defects and uniform TiC particle distribution. The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art can change or modify the technical content disclosed above into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A manufacturing method of a TiC particle enhanced martensite wear-resistant steel plate with thick specification is characterized by comprising the steps of converter smelting, external refining, protective casting, casting blank slow cooling, continuous casting blank heating, high-permeability rolling, cooling and heat treatment; wherein,
the high-permeability rolling adopts a medium plate mill, the rolling process adopts high-permeability rolling to the specification of more than 30mm, and the finish rolling temperature is properly increased;
the cooling mode after rolling is air cooling after rolling, and cooling to room temperature; then carrying out off-line heat treatment, wherein the quenching temperature is 800-950 ℃, and the heating time is 1-3 hours; the tempering temperature is 160-260 ℃, and the heat preservation time is 1-5 hours;
the martensite wear-resistant steel plate comprises the following chemical components in percentage by weight: 0.20 to 0.40%, Si: 0.20 to 0.30%, Mn: 0.50-1.00%, P is less than or equal to 0.0010%, S is less than or equal to 0.003%, Ti: 0.30-0.80%, Mo: 0.30 to 0.50%, Cr: 0.50-1.00%, B: 0.0008 to 0.002 percent of Fe and the balance of inevitable impurity elements.
2. The manufacturing method according to claim 1, wherein high quality molten steel is used for smelting, and the content of harmful element N, S, P is controlled during the smelting process so that the content of N is less than or equal to 40 ppm; the content of S is less than or equal to 0.003 percent; the content of P is less than or equal to 0.0010 percent, and the continuous casting billet is obtained by adopting the whole-process argon blowing protection casting.
3. The manufacturing method according to claim 1, wherein the casting blank slow cooling adopts slow cooling pit heating slow cooling or casting blank stacking slow cooling mode slow cooling; the heating temperature of the continuous casting blank is 1050-1250 ℃, and the time is 3-5 hours.
4. The manufacturing method of claim 1, wherein the high permeability is that after the continuous casting slab exits from the heating furnace, a high-pressure descaling device of a rolling mill is used for descaling and cooling the slab, so that the surface temperature of the continuous casting slab is 920-960 ℃, and the core temperature of the slab is 1000-1100 ℃.
5. The manufacturing method according to claim 1, wherein the rolling is performed by two-stage rolling including rough rolling and finish rolling.
6. The method according to claim 5, wherein the rough rolling is performed in three passes with a reduction of 13 to 18%, 13 to 22%, and 15 to 28%, respectively.
7. The manufacturing method according to claim 5, wherein the rough rolling is performed by three passes of rolling with a reduction of 14 to 16%, 15 to 19%, and 17 to 23%, respectively.
8. The manufacturing method according to claim 5, wherein a start rolling temperature of the finish rolling is 900 to 950 ℃; and the finish rolling temperature of the finish rolling is 850-895 ℃, and the steel plate is rolled to a thick specification steel plate with the thickness of more than 30 mm.
9. The manufacturing method according to claim 5, wherein a start rolling temperature of the finish rolling is 900 to 920 ℃; the finish rolling temperature of the finish rolling is 880-890 ℃.
10. The method according to claim 1, wherein the quenching temperature is 850 to 900 ℃, the heating time is 1 to 3 hours, the tempering temperature is 180 to 200 ℃, and the holding time is 2 to 4 hours.
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| CN115418576A (en) * | 2022-08-08 | 2022-12-02 | 东北大学 | Manufacturing method of high-toughness TiC particle reinforced martensite wear-resistant steel plate |
| CN115505826A (en) * | 2022-10-24 | 2022-12-23 | 东北大学 | Method for preparing high-toughness TiC particle enhanced martensite wear-resistant steel plate through rare earth modification treatment |
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