CN117626139A - Novel wear-resistant steel plate and smelting process thereof - Google Patents
Novel wear-resistant steel plate and smelting process thereof Download PDFInfo
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- CN117626139A CN117626139A CN202210947110.3A CN202210947110A CN117626139A CN 117626139 A CN117626139 A CN 117626139A CN 202210947110 A CN202210947110 A CN 202210947110A CN 117626139 A CN117626139 A CN 117626139A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000003723 Smelting Methods 0.000 title claims description 25
- 238000000034 method Methods 0.000 title claims description 25
- 230000008569 process Effects 0.000 title claims description 17
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- 239000006104 solid solution Substances 0.000 claims description 28
- 238000011282 treatment Methods 0.000 claims description 25
- 239000000243 solution Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000005261 decarburization Methods 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 description 9
- 150000001247 metal acetylides Chemical class 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 229910000617 Mangalloy Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a novel wear-resistant steel plate which is characterized by comprising the following chemical components in percentage by mass: c:1.0 to 1.3 percent, si:0.3 to 0.5 percent, mn:22.0 to 22.3 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.0 to 6.2 percent, B:0.002% -0.005% and the balance of Fe and unavoidable impurities. The wear-resistant steel plate has the thickness of 50-55mm, obviously improved mechanical properties, tensile strength of 1500MPa, yield strength of 574MPa, impact toughness of 156J/cm < 2 >, hardness of 550HB and elongation after fracture of 11%, so that the hardness, strength and impact toughness reach the optimal matching values.
Description
Technical Field
The invention relates to the technical field of wear-resistant steel plate manufacturing, in particular to a novel wear-resistant steel plate and a smelting process thereof.
Background
Large equipment such as mining, crushing, excavating and other equipment is continuously appeared in the industries of metallurgy, mines and the like, and the abrasion-resistant parts thereof weigh several tons to tens of tons. Compared with the traditional high manganese steel, the ultra-high manganese steel (Mn > 17%) has stronger work hardening capacity and higher low-temperature impact toughness. Therefore, the method is widely applied to strong load or extrusion working conditions, such as crusher hammers, large-scale ball mill liners and the like.
Patent publication No. CN 102666897a discloses a high-toughness wear-resistant steel sheet having good workability and hardly affected properties by manufacturing conditions, and a method for manufacturing the same, which has a low carbon equivalent and excellent low-temperature impact toughness, but the hardness of the thickness section is not evaluated, and some engineering machinery equipment requires the same surface hardness as the hardness of the thickness section, and generally requires the core hardness to be not less than 85% of the surface hardness. The test is completed in a laboratory, the cooling rate is slightly high, and normal industrial production cannot be achieved.
The patent of publication No. CN 110205557B discloses a high-toughness wear-resistant steel plate with 350-380HBW hardness level and thick specification and a preparation method thereof, wherein the impact energy at minus 40 ℃ is more than 60J, and the hardness is only 350-380HBW.
Disclosure of Invention
Aiming at the technical problems and overcoming the defects in the prior art, the invention provides a novel wear-resistant steel plate, which comprises the following chemical components in percentage by mass: c:1.0 to 1.3 percent, si:0.3 to 0.5 percent, mn:22.0 to 22.3 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.0 to 6.2 percent, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
The technical scheme of the invention is as follows:
the novel wear-resistant steel plate comprises the following chemical components in percentage by mass: c:1.0 to 1.2 percent, si:0.3 to 0.5 percent, mn:22.0 to 22.2 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.0 to 6.1 percent, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
The novel wear-resistant steel plate comprises the following chemical components in percentage by mass: c:1.2 to 1.3 percent, si:0.3 to 0.5 percent, mn:22.2 to 22.3 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.1 to 6.2 percent, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
The novel wear-resistant steel plate has the thickness of 50-55mm.
Another object of the present invention is to provide a smelting process of a novel wear-resistant steel plate, comprising the following steps: the method comprises the steps of molten iron desulfurization pretreatment, converter smelting, LF furnace and casting, rolling and online solid solution, and specifically comprises the following steps:
dephosphorizing, desilicating and desulfurizing molten iron, adding into a converter for decarburization and heating, adding SI and Mn elements after slag flowing to 1550-1600 ℃, tapping at 1540-1560 ℃ after melting, adding Al and B elements in an LF furnace after tapping, and smelting for 50-70 min;
continuous casting is carried out at 1420-1460 ℃;
and carrying out on-line solution treatment after rolling.
In the smelting process of the novel wear-resistant steel plate, when in online solid solution, a high-temperature gun is used for measuring the water inlet temperature of the steel plate, the steel plate is quenched into water and is rapidly stirred, a cooling grid 200-400 mm away from the bottom surface is arranged in a water tank, the total amount of water in the water tank is 8-10 times of the weight of a casting to be filled with water, the water temperature is less than or equal to 30 ℃, the water temperature after online solid solution is lower than 35 ℃, and the water inlet temperature of the steel plate is not lower than 850 ℃.
In the smelting process of the novel wear-resistant steel plate, during online solid solution, the steel plate is firstly heated to 1050 ℃ and then is subjected to online solid solution treatment after heat preservation for 1h, and then is heated to 550 ℃ and then is subjected to air cooling treatment after heat preservation for 2 h.
Compared with the prior art, the invention has the following beneficial effects:
(1) The addition of aluminum reduces the activity and diffusion coefficient of the austenite matrix carbon and increases the stability of the carbon. In the aging process, the aluminum inhibits precipitation of coarse acicular carbide, precipitates a large amount of nano (Fe, mn) 3AlC K-carbide, and improves the wear resistance of the ultra-high manganese steel. (2) The aluminum increases the stacking fault energy of the ultra-high manganese steel (from 36.5mJ/m < 2 > to 67.3mJ/m < 2 >), reduces the work hardening rate, strongly inhibits the twin transformation and changes the work hardening mechanism thereof; wear hardening mechanism of light wear-resistant steel under low impact load: dislocation entanglement and dislocation wall are adopted in the on-line solid solution; the abrasion hardening mechanism after online solid solution and aging at 550 ℃ is a high-density dislocation wall and high-density dislocation entanglement; (3) Under the process conditions, the dispersion distribution of tiny carbides in an austenite matrix is obviously improved, the tensile strength is 1500MPa, the yield strength is 574MPa, the impact toughness is 156J/cm < 2 >, the hardness is 550HB, the elongation after fracture is 11%, and the hardness, the strength and the impact toughness reach the optimal matching values.
Drawings
FIG. 1 is an XRD pattern of the structure after on-line solution treatment;
FIG. 2 is an SEM photograph of carbide after 1000 ℃ online solution treatment;
FIG. 3 is an SEM photograph of carbide after on-line solution treatment at 1030 ℃;
FIG. 4 is an SEM photograph of carbide after 1050 ℃ in-line solution treatment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1.
Referring to fig. 1 to 2, the novel wear-resistant steel plate in the embodiment has a thickness of 50-55mm and comprises the following chemical components in percentage by mass: c:1.0%, si:0.3%, mn:22.0%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, al:6.0%, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
The smelting process comprises the following steps: the method comprises the steps of molten iron desulfurization pretreatment, converter smelting, LF furnace and casting, rolling and online solid solution, and specifically comprises the following steps:
dephosphorizing, desilicating and desulfurizing molten iron, adding into a converter for decarburization and heating, adding SI and Mn elements after slag flowing to 1550-1600 ℃, tapping at 1540-1560 ℃ after melting, adding Al and B elements after tapping into an LF furnace, and smelting for 50-70 min;
continuous casting is carried out at 1420-1460 ℃; and carrying out on-line solution treatment after rolling.
The smelting process of the novel wear-resistant steel plate comprises the steps of measuring the water inlet temperature of the steel plate by adopting a high-temperature gun when in online solid solution, quenching the steel plate into water and rapidly stirring, setting a cooling grid 400mm away from the bottom surface in a water tank, wherein the total amount of water in the water tank is 10 times of the weight of a casting to be in water, the water temperature is 30 ℃, and the water temperature after online solid solution is lower than 35 ℃, wherein when in online solid solution, firstly heating the steel plate to 1000 ℃, preserving the heat for 1h, then carrying out online solid solution treatment, and then carrying out air cooling treatment after preserving the heat for 2h at 550 ℃.
Example 2.
Referring to fig. 1 and 3, the novel wear-resistant steel plate in the embodiment has a thickness of 50-55mm and comprises the following chemical components in percentage by mass: c:1.1%, si:0.4%, mn:22.2 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.1%, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
The smelting process comprises the following steps: the method comprises the steps of molten iron desulfurization pretreatment, converter smelting, LF furnace and casting, rolling and online solid solution, and specifically comprises the following steps:
dephosphorizing, desilicating and desulfurizing molten iron, adding into a converter for decarburization and heating, adding SI and Mn elements after slag flowing to 1550-1600 ℃, tapping at 1540-1560 ℃ after melting, adding Al and B elements after tapping into an LF furnace, and smelting for 50-70 min;
continuous casting is carried out at 1420-1460 ℃; and carrying out on-line solution treatment after rolling.
The smelting process of the novel wear-resistant steel plate comprises the steps of measuring the water inlet temperature of the steel plate by adopting a high-temperature gun when in online solid solution, quenching the steel plate into water and rapidly stirring, setting a cooling grid 400mm away from the bottom surface in a water tank, wherein the total amount of water in the water tank is 10 times of the weight of a casting to be in water, the water temperature is 30 ℃, and the water temperature after online solid solution is lower than 35 ℃, wherein when in online solid solution, firstly heating the steel plate to 1030 ℃, preserving the heat for 1h, then carrying out online solid solution treatment, and then carrying out air cooling treatment after preserving the heat for 2h at 550 ℃.
Example 3.
Referring to fig. 1 and 4, the novel wear-resistant steel plate in the embodiment has a thickness of 50-55mm and comprises the following chemical components in percentage by mass: c:1.3%, si:0.5%, mn:22.3 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.2%, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
The smelting process comprises the following steps: the method comprises the steps of molten iron desulfurization pretreatment, converter smelting, LF furnace and casting, rolling and online solid solution, and specifically comprises the following steps:
dephosphorizing, desilicating and desulfurizing molten iron, adding into a converter for decarburization and heating, adding SI and Mn elements after slag flowing to 1550-1600 ℃, tapping at 1540-1560 ℃ after melting, adding Al and B elements after tapping into an LF furnace, and smelting for 50-70 min;
continuous casting is carried out at 1420-1460 ℃; and carrying out on-line solution treatment after rolling.
The smelting process of the novel wear-resistant steel plate comprises the steps of measuring the water inlet temperature of the steel plate by adopting a high-temperature gun when in online solid solution, quenching the steel plate into water and rapidly stirring, setting a cooling grid 400mm away from the bottom surface in a water tank, wherein the total amount of water in the water tank is 10 times of the weight of a casting to be in water, the water temperature is 30 ℃, and the water temperature after online solid solution is lower than 35 ℃, wherein when in online solid solution, firstly heating the steel plate to 1050 ℃, preserving the heat for 1h, then carrying out online solid solution treatment, and then carrying out air cooling treatment after preserving the heat for 2h at 550 ℃.
According to fig. 1, it can be seen that the novel wear-resistant steel grade is a single-phase austenitic structure. The austenite average grain size was measured by software and found to be 205.4 μm.
The strength and toughness are mainly influenced by the comprehensive influence of the dissolution of carbide and the growth of crystal grains, and at 1000-1050 ℃, the influence of the dissolution of coarse carbide on the improvement of mechanical properties is dominant, so that the strength and toughness are improved along with the increase of the online solution treatment temperature; above 1050 ℃, carbide already matrix is dissolved in austenite matrix, which almost contributes to the improvement of mechanical properties of the novel wear-resistant steel, and austenite grains inevitably grow and coarsen along with the increase of online solution treatment temperature. As the diffusion capacity of each element is enhanced along with the increase of the temperature, the migration speed of the grain boundary is also increased, the crystal grains grow more obviously in the same time, and the larger the crystal grains are, the denaturation coordination capacity among the crystal grains is weakened. If the orientation difference between the grains is large, the grain sliding system cutting stress is not easy to reach the critical cutting stress through the rotation of the grains, so that the growth of the grains can lead to uneven deformation and poor mechanical properties of the novel wear-resistant steel, and in order to observe the distribution condition of undissolved carbides after different on-line solid solution temperature heat treatments, SEM is utilized for observation, and the results are respectively shown in figures 2 to 4.
As can be seen from fig. 2 to 4, after the 1000 ℃ online solution treatment, a large number of carbides and pits formed by the falling-off of the carbides are distributed in the austenite grain boundaries and the grains; after on-line solution treatment at 1030 ℃, the carbides are relatively reduced, and long and narrow blocky carbides which are aggregated into a pile and carbides which are distributed in a granular state still exist; after 1050 ℃ online solution treatment, the carbide is almost completely dissolved in an austenite matrix, and only a very small amount of punctiform carbide is distributed in austenite crystals, so that the structure is homogenized. As the temperature of the person increases, the dissolution and spheroidization of carbide are very beneficial to the structure and performance of the novel wear-resistant steel, but the over-high temperature of the online solution treatment can lead to the formation of grains which are unfavorable to the structure and performance of the novel wear-resistant steel.
According to the invention, under the technological conditions, tiny carbides in an austenite matrix are dispersed, the mechanical property is obviously improved, the tensile strength is 1500MPa, the yield strength is 574MPa, the impact toughness is 156J/cm < 2 >, the hardness is 550HB, the elongation after fracture is 11%, and the hardness, the strength and the impact toughness reach the optimal matching values.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The novel wear-resistant steel plate is characterized by comprising the following chemical components in percentage by mass: c:1.0 to 1.3 percent, si:0.3 to 0.5 percent, mn:22.0 to 22.3 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.0 to 6.2 percent, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
2. The novel wear resistant steel sheet as set forth in claim 1, wherein: the chemical components and mass percentages are as follows: c:1.0 to 1.2 percent, si:0.3 to 0.5 percent, mn:22.0 to 22.2 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.0 to 6.1 percent, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
3. The novel wear resistant steel sheet as set forth in claim 1, wherein: the chemical components and mass percentages are as follows: c:1.2 to 1.3 percent, si:0.3 to 0.5 percent, mn:22.2 to 22.3 percent, P is less than or equal to 0.015 percent, S is less than or equal to 0.015 percent, al:6.1 to 6.2 percent, B:0.002% -0.005% and the balance of Fe and unavoidable impurities.
4. The novel wear resistant steel sheet as set forth in claim 1, wherein: the thickness of the wear-resistant steel plate is 50-55mm.
5. A novel smelting process of a wear-resistant steel plate is characterized in that: application to any of claims 1-4, comprising the following procedures: the method comprises the steps of molten iron desulfurization pretreatment, converter smelting, LF furnace and casting, rolling and online solid solution, and specifically comprises the following steps:
dephosphorizing, desilicating and desulfurizing molten iron, adding into a converter for decarburization and heating, adding SI and Mn elements after slag flowing to 1550-1600 ℃, tapping at 1540-1560 ℃ after melting, adding Al and B elements in an LF furnace after tapping, and smelting for 50-70 min;
continuous casting is carried out at 1420-1460 ℃;
and carrying out on-line solution treatment after rolling.
6. The smelting process of the novel wear-resistant steel plate as claimed in claim 5, wherein: when in on-line solid solution, the water inlet temperature of the steel plate is measured by adopting a high-temperature gun, the steel plate is quenched into water and is rapidly stirred, a cooling grid 200-400 mm away from the bottom surface is arranged in a pool, the total amount of pool water is 8-10 times of the weight of a casting to be in water, the water temperature is less than or equal to 30 ℃, the water temperature after on-line solid solution is lower than 35 ℃, and the water inlet temperature of the steel plate is not lower than 850 ℃.
7. The smelting process of the novel wear-resistant steel plate as set forth in claim 6, wherein: and in the online solid solution process, firstly heating the steel plate to 1050 ℃ and preserving heat for 1h, then carrying out online solid solution treatment, and then heating to 550 ℃ and preserving heat for 2h, and then carrying out air cooling treatment.
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| CN202210947110.3A CN117626139A (en) | 2022-08-09 | 2022-08-09 | Novel wear-resistant steel plate and smelting process thereof |
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| CN202210947110.3A CN117626139A (en) | 2022-08-09 | 2022-08-09 | Novel wear-resistant steel plate and smelting process thereof |
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