CN116463549A - High-wear-resistance steel plate and online manufacturing method thereof - Google Patents
High-wear-resistance steel plate and online manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 82
- 239000010959 steel Substances 0.000 title claims abstract description 82
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 26
- 229910001563 bainite Inorganic materials 0.000 claims description 11
- 229910000734 martensite Inorganic materials 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 238000003303 reheating Methods 0.000 claims description 8
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 15
- 238000005496 tempering Methods 0.000 abstract description 13
- 238000010791 quenching Methods 0.000 abstract description 5
- 230000000171 quenching effect Effects 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000005299 abrasion Methods 0.000 description 12
- 239000011572 manganese Substances 0.000 description 10
- 239000011651 chromium Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 235000013372 meat Nutrition 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
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- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- 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
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
- C21D2211/002—Bainite
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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
- C21D2211/008—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
- 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
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the technical field of wear-resistant steel preparation, in particular to a high-wear-resistance steel plate and an online manufacturing method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.18% -0.35%, si:1.00% -1.50%, mn:1.80% -2.50%, P <0.010%, S <0.003%, als:0.015% -0.035%, cr:0.20% -0.40%, V:0.020% -0.060%, and accords with C+Mn/10+Cr/15+3V less than or equal to 0.65%, and the balance is Fe and unavoidable impurities. According to the invention, the relative content among economic elements such as Si, mn, cr, V is reduced, the relative content is reasonably regulated, and C+Mn/10+Cr/15+3V which has important influence on wear resistance is controlled, so that the long-flow offline quenching and tempering process of the traditional wear-resistant steel is omitted, the final tissue proportion balance is realized by adopting a proper online air cooling short-flow process, and the obtained steel plate has ultrahigh hardness, good toughness and plasticity and excellent wear resistance.
Description
Technical Field
The invention relates to the technical field of wear-resistant steel preparation, in particular to a high-wear-resistance steel plate and an online manufacturing method thereof.
Background
The wear-resistant steel plate is mainly used for wear-resistant working parts and structures of products such as excavators, loaders, bulldozers, graders, large off-highway dumpers, electric wheels and the like in engineering machinery industry, equipment parts which need abrasion and scouring of material conveying links such as mining, mineral separation, wharfs, cement plants, steel plants and the like, and the consumption is extremely high. With the strengthening of national investment of public infrastructure, energy construction and water conservancy construction of highways, railways and the like, the market demand of wear-resistant steel is rapidly increased. In the past, domestic wear-resistant steel mainly takes high-carbon, high-manganese, high-chromium and high-nickel materials as main materials, and common processes comprise quenching and tempering, so that the problems of insufficient environmental protection and energy conservation, insufficient alloy resource saving and the like exist in production. Especially for the collapse, vibration and impact operation environment of a large amount of large materials in the metallurgical mine, coal exploitation and transportation processes, the special impact friction and sliding friction function of the large materials change the steel abrasion mechanism, the conventional abrasion-resistant steel presents a block peeling phenomenon in the use process, commonly called meat falling, so that downstream users commonly propose to improve the hardness of the abrasion-resistant steel and simultaneously have toughness storage, so that the abrasion-resistant parts are uniformly worn as a whole, and the service life of the abrasion-resistant steel is prolonged.
A high-toughness ultra-high-strength wear-resistant steel plate and a production method thereof (application number: 200910013285.1) are disclosed, wherein the steel plate comprises the chemical components of 0.15% -0.26% of C, 0.20% -0.55% of Si, 1.0% -1.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.00% -0.60% of Mo, 0.00% -0.50% of Ni, 0.20% -1.00% of Cr, 0.01% -0.05% of Ti, 0.02% -0.04% of Als, 0.0005% -0.004% of B and the balance of Fe and unavoidable impurities, and the technical scheme adopts a heat treatment process of quenching and tempering after rolling to obtain a tempered martensitic structure; the components are conventional Mo, ni, cr, B system, and the hardness level is 420-480HBW. The technical proposal adopts the addition of Mo and Ni to separate out M x C y The method of expensive alloy elements such as wear-resistant particles improves the strength and toughness of the wear-resistant steel, which inevitably increases the production cost; the working procedures of off-line quenching, tempering heat treatment and the like are added, the tempered martensite structure is in a structure state with larger transformation stress and limited toughness storage, larger residual stress exists in the tempered martensite structure, the steel plate is easily cracked at the lath boundary in the use process, the phenomenon of 'meat falling' of the steel plate is further developed into blocks, and the tempered martensite structure needs to be matched with special equipment, can increase the working procedure cost, faces the practical problems of large energy consumption and the like.
Therefore, development of a long-life wear-resistant steel plate with balanced structure state, ultra-high hardness and good toughness and plasticity and an online short-process manufacturing method thereof are urgently needed.
Disclosure of Invention
Aiming at the technical problems of high production cost caused by adding noble alloy elements such as Mo, ni and the like, large residual stress and increased process cost exist in a tempered martensite structure, and the like, the invention provides the high-wear-resistance steel plate and the online manufacturing method thereof, wherein the addition of the noble elements Mo and Ni is omitted, the low-cost Si and Mn alloy element design is adopted, and the high-wear-resistance steel plate in a medium-carbon bainite and martensite equilibrium structure state is obtained through online air cooling hardening after rolling and stacking self-tempering process, so that the steel plate has good toughness reserve while ultra-high hardness is obtained; the obtained steel plate is guaranteed to have good wear resistance and impact resistance, and the requirements of special operation environments in the metallurgical mine, coal exploitation and transportation processes on the overall uniform wear of operation parts and service life improvement can be met.
In a first aspect, the present invention provides an on-line manufacturing method of a high wear-resistant steel sheet, the steel sheet comprising, by weight, C:0.18% -0.35%, si:1.00% -1.50%, mn:1.80% -2.50%, P <0.010%, S <0.003%, als:0.015% -0.035%, cr:0.20% -0.40%, V:0.020% -0.060%, and accords with C+Mn/10+Cr/15+3V less than or equal to 0.65%, and the balance is Fe and unavoidable impurities;
the on-line manufacturing method at least comprises the following steps:
a) Straightening a continuous casting blank, and controlling the temperature of a straightening section to be more than 900 ℃;
b) The billet is directly hot-fed, and the hot-feeding temperature is controlled to be 150-400 ℃ or above 550 ℃;
c) Reheating the steel billet, and controlling the reheating temperature to be 1200-1250 ℃;
d) Rolling, wherein the final rolling temperature is controlled to be 780-820 ℃;
e) Directly air-cooling the rolled steel plates to 350 ℃, quickly feeding the steel plates into a stack, controlling the temperature of the steel plates to 260-350 ℃ during stacking, and adopting a hot steel plate lower-laying upper cover.
In step d), the rolling speed is less than or equal to 1.2m/s at the high temperature stage of 950 ℃ or higher, and the rolling is carried out by adopting a forward rolling mode.
Further, in the step d), the final rolling pass steel throwing speed is less than or equal to 2m/s.
Further, in step e), samples are taken after 96 hours of stacking, and mechanical property inspection is performed.
In a second aspect, the present invention provides a high wear resistance steel sheet prepared by the above-described in-line manufacturing method.
Further, the structure of the high wear resistance steel plate is a medium-carbon bainite/martensite complex phase, and the volume fraction of bainite is more than 40%.
Further, the maximum thickness of the high abrasion resistance steel sheet was 60mm.
Further, the yield strength of the high-wear-resistance steel plate is 1400-1650MPa, the tensile strength is 1600-2000MPa, the elongation is more than or equal to 14%, the low-temperature impact CVN (-40 ℃ in the transverse direction) is more than or equal to 30J, and the hardness is 500-570HBW; the relative wear resistance coefficient of the relatively low alloy steel Q345B is more than or equal to 2.5.
The invention adopts high Si and Mn design, adds Cr, V and other economic elements, adopts an online air cooling short flow process to realize the wear-even and long-service-life wear-resistant steel with the ultra-high hardness of 500-570HBW, meets the requirements of high stress and impact application environments of large dumper, electric wheelers and the like on the wear-even and long-service-life wear-resistant steel, and has the beneficial effects that:
(1) The component system is unique, the material has ultra-high hardness and good toughness and plasticity:
adopts an economical high Si, mn and Cr alloy element design system, and reduces the bainite transformation starting temperature B through the design of high Mn components S And does not significantly reduce M S The method takes refined medium-carbon bainite and martensite to improve the toughness and plasticity of the steel plate as main principles, fully plays the beneficial effects of Si in inhibiting tempering brittleness and improving tempering resistance, and takes the principle that high Si promotes carbon distribution from martensite to residual austenite in the tempering process, so that the performance change of the prepared steel plate along with the stacking self-tempering temperature in a wide range is not obvious, the ultra-high hardness is maintained, and meanwhile, good plasticity and toughness indexes are still provided, and the high-toughness storage requirement of high-hardness steel proposed by a user is met.
(2) The air cooling self-hardening and stacking self-tempering are adopted, the process is simple and short, and the energy saving and consumption reducing effects are obvious:
the specially designed high Si and Mn steel can obtain a bainite and martensite complex phase structure under the cooling speed condition of air cooling, and can realize the self-tempering function through stacking slow cooling in a low-temperature transition region below 350 ℃, so that the off-line quenching and tempering process is omitted while the final comprehensive performance is realized, and the development trend of the current green low-carbon short-flow production and manufacturing technology is met.
(3) The product has excellent uniform abrasion and stripping resistance:
the relative content of economic elements such as Si, mn, cr, V and the like and C+Mn/10+Cr/15+3V which have important influence on wear resistance are reasonably proportioned, fine bainite in steel and residual austenite with high carbon content in the stacking self-tempering process are used for obtaining good plasticity and toughness indexes, and the toughness and plasticity are improved through low Wen Zhongga fine grains and the like, so that the wear uniformity of the ultra-high hardness steel in the practical working condition application is ensured, the anti-stripping (meat falling) performance is more than 10 times that of other products, and the wear resistance is more than 2.5 times that of the Q345 low alloy steel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a photograph of a microstructure of a steel sheet prepared in example 1.
FIG. 2 is a photograph of a microstructure of the steel sheet prepared in example 2.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
The high-wear-resistance steel plate with the thickness of 60mm comprises the following chemical components in percentage by weight:
0.31% of C, 1.42% of Si, 2.38% of Mn, 0.008% of P, 0.001% of S, 0.017% of Als, 0.36% of Cr, 0.023% of V, C+Mn/10+Cr/15+3V=0.64% of Fe and unavoidable impurities as the rest.
The production method of the steel plate comprises the following steps:
the raw materials are smelted, deoxidized, alloyed, refined and continuously cast to obtain high-quality casting blank, and
a) The casting blank pulling speed is matched with cooling water, and the temperature of the actual straightening section of the continuous casting blank is calculated to be 915 ℃;
b) Directly hot-feeding the steel billet, and controlling the hot-feeding temperature to be 380 ℃;
c) Reheating the billet, controlling the reheating temperature at 1230 ℃ and controlling the heating time at 8 min/cm;
d) Rolling, wherein the rolling speed of a high-temperature stage above 950 ℃ is controlled to be 1.15m/s, the rolling is performed in a forward rolling mode, the finishing temperature is controlled to be 790 ℃, and the steel throwing speed of a finishing pass is controlled to be 1.8m/s;
e) After rolling, the steel plates are stacked through a roller way and fast offline, the temperature of the steel plates is 348 ℃ during stacking, other high-temperature steel rolling plates are used for paving an upper cover under the steel plates, and after stacking for 96 hours, stacking is performed, and sampling inspection is performed by a sampling plate.
The microstructure of the produced 60mm steel plate contains 48% of bainite, and the mechanical properties are as follows: yield strength 1480MPa, tensile strength 1650MPa, elongation 17%, average impact energy of-40 ℃ (transverse direction) up to 46J, hardness 528HBW, and abrasion resistance 2.8 times that of Q345 low alloy steel as measured by ring abrasion test.
Example 2
The high-wear-resistance steel plate with the thickness of 22mm comprises the following chemical components in percentage by weight:
0.23% of C, 1.18% of Si, 1.93% of Mn, 0.007% of P, 0.002% of S, 0.029% of Als, 0.22% of Cr, 0.051% of V, C+Mn/10+Cr/15+3V=0.59% of Fe and unavoidable impurities.
The production method of the steel plate comprises the following steps:
the raw materials are smelted, deoxidized, alloyed, refined and continuously cast to obtain high-quality casting blank, and
a) The casting blank pulling speed is matched with cooling water, and the temperature of the actual straightening section of the continuous casting blank is calculated to be 907 ℃;
b) Directly hot-feeding the steel billet, and controlling the hot-feeding temperature to be 620 ℃;
c) Reheating the billet, controlling the reheating temperature at 1210 ℃, and controlling the heating time at 7 min/cm;
d) Rolling, wherein the rolling speed of a high-temperature stage above 950 ℃ is controlled to be 1.08m/s, the rolling is performed in a forward rolling mode, the final rolling temperature is controlled to be 815 ℃, and the steel throwing speed of a final rolling pass is controlled to be 1.65m/s;
e) After rolling, the steel plates are stacked through a roller way and fast offline, the temperature of the steel plates is 290 ℃ during stacking, other high-temperature steel rolling plates are used for paving an upper cover under the steel plates, and after stacking for 96 hours, stacking is performed, and sampling inspection is performed on the steel plates.
The microstructure of the produced 22mm steel plate contains 41% of bainite, and the mechanical properties are as follows: the yield strength is 1610MPa, the tensile strength is 1818MPa, the elongation is 15.5%, the average impact energy of-40 ℃ (transverse direction) reaches 35J, the hardness is 562HBW, and the abrasion resistance is 3.1 times of that of Q345 low alloy steel detected by a ring abrasion test.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (8)
1. An on-line manufacturing method of a high-wear-resistance steel plate is characterized in that the steel plate comprises the following chemical components in percentage by weight: 0.18% -0.35%, si:1.00% -1.50%, mn:1.80% -2.50%, P <0.010%, S <0.003%, als:0.015% -0.035%, cr:0.20% -0.40%, V:0.020% -0.060%, and accords with C+Mn/10+Cr/15+3V less than or equal to 0.65%, and the balance is Fe and unavoidable impurities;
the on-line manufacturing method at least comprises the following steps:
a) Straightening a continuous casting blank, and controlling the temperature of a straightening section to be more than 900 ℃;
b) The billet is directly hot-fed, and the hot-feeding temperature is controlled to be 150-400 ℃ or above 550 ℃;
c) Reheating the steel billet, and controlling the reheating temperature to be 1200-1250 ℃;
d) Rolling, wherein the final rolling temperature is controlled to be 780-820 ℃;
e) Directly air-cooling the rolled steel plates to 350 ℃, quickly feeding the steel plates into a stack, controlling the temperature of the steel plates to 260-350 ℃ during stacking, and adopting a hot steel plate lower-laying upper cover.
2. The on-line manufacturing method according to claim 1, wherein in the step d), a rolling speed is not more than 1.2m/s at a high temperature stage of 950 ℃ or more, and the rolled product is rolled by a forward rolling method.
3. The on-line manufacturing method according to claim 1, wherein in step d), the finishing pass casting speed is not more than 2m/s.
4. The in-line manufacturing method according to claim 1, wherein in step e), the samples are sampled after stacking for 96 hours, and the mechanical property test is performed.
5. A high wear resistance steel sheet produced by the in-line manufacturing method according to claim 1.
6. The high wear resistant steel sheet according to claim 5, wherein the structure of the high wear resistant steel sheet is a medium carbon bainite/martensite complex phase and the volume fraction of bainite is >40%.
7. The high wear resistant steel sheet according to claim 5, wherein the maximum thickness of the high wear resistant steel sheet is 60mm.
8. The high-wear-resistant steel sheet according to claim 5, wherein the high-wear-resistant steel sheet has a yield strength of 1400 to 1650MPa, a tensile strength of 1600 to 2000MPa, an elongation of 14% or more, a transverse Charpy impact energy of 40 ℃ below zero of 30J or more, and a hardness of 500 to 570HBW or more; the relative wear resistance coefficient of the relatively low alloy steel Q345B is more than or equal to 2.5.
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