CN116536488A - Wear-resistant steel plate and electric heating quenching method thereof - Google Patents
Wear-resistant steel plate and electric heating quenching method thereof Download PDFInfo
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- CN116536488A CN116536488A CN202210083278.4A CN202210083278A CN116536488A CN 116536488 A CN116536488 A CN 116536488A CN 202210083278 A CN202210083278 A CN 202210083278A CN 116536488 A CN116536488 A CN 116536488A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 149
- 239000010959 steel Substances 0.000 title claims abstract description 149
- 238000010791 quenching Methods 0.000 title claims abstract description 37
- 230000000171 quenching effect Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005485 electric heating Methods 0.000 title claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 239000000956 alloy Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 31
- 230000008569 process Effects 0.000 description 15
- 230000006698 induction Effects 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 239000000443 aerosol Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002500 effect on skin Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- C21D1/34—Methods of heating
- C21D1/40—Direct resistance heating
-
- 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
- C21D1/62—Quenching devices
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention discloses a wear-resistant steel plate and an electric heating quenching method thereof, comprising the following steps: s1, arranging a steel plate on a conveying roller way; s2, arranging a vertical pinch roll on the conveying roller way to enable the steel plate to be positioned at the center line position of the conveying roller way; s3, arranging a horizontal pinch roll on the conveying roller way behind the vertical pinch roll to inhibit buckling deformation of the steel plate; s4, arranging a first conductive roller, a second conductive roller and a power supply on the conveying roller way behind the horizontal pinch roller in sequence, so that a current conduction loop is formed among the steel plate, the first conductive roller, the second conductive roller and the power supply to electrically heat the steel plate; s5, arranging a cooler on the conveying roller way behind the second conductive roller, and cooling the surface temperature of the steel plate to the room temperature. The invention improves the hardness of the surface of the wear-resistant steel plate within a certain depth range through electric heating quenching, and increases the wear resistance of the steel plate.
Description
Technical Field
The invention relates to a wear-resistant steel plate manufacturing technology, in particular to a wear-resistant steel plate and an electric heating quenching method thereof.
Background
In the ferrous metallurgy industry, the technology for manufacturing the wear-resistant steel plate is widely paid attention to in the world manufacturing countries in recent decades, some large-scale steel companies at home and abroad develop various high-performance low-cost wear-resistant steel plates in large scale according to respective actual practice, the high-strength wear-resistant steel plate for engineering machinery in China has been formed into a wear-resistant steel plate series grade with gradually increased hardness from NM300 to NM600 according to national standard GB/T24186-2009, the technology is mainly characterized in that 1% -3% of Cr, ni, mo and other alloy elements are added on the basis of 0.1% -0.25% of ordinary carbon steel to form low-alloy high-strength steel, and the low-alloy high-strength steel plate is directly quenched and tempered after slab continuous casting and continuous rolling or is reinforced by a controlled rolling and cooling process (TMCP), and the wear-resistant steel plate generally has the characteristics of high hardness and high strength, and has better processing performance and excellent wear resistance performance, the service life is several times that of the traditional structural steel plate, meanwhile, due to the adoption of continuous large production process, energy and resource consumption are saved, and the steel plate can be widely used in various wear-resistant mechanical bins such as a high-resistant material bin of a dumper, and a wide range of wear-resistant medium for manufacturing of a natural gas storage hopper.
The strengthening by heat treatment after rolling can avoid a series of problems caused by poor fluidity of the steel water in the casting process and poor plastic deformation performance in the rolling process of the high-alloyed wear-resistant steel plate, and is considered as an effective way for improving the comprehensive service performance mainly including the wear resistance of the wear-resistant steel plate. In the aspect of heat treatment of the wear-resistant steel plate, the hot-rolled steel plate is subjected to offline quenching and tempering heat treatment at present so as to improve the hardness and strength of the wear-resistant steel plate, optimize the comprehensive service performance of the wear-resistant steel plate and prevent the wear failure caused by insufficient wear resistance and the fracture failure caused by insufficient toughness in the use process of the wear-resistant steel plate. For example, according to the Chinese patent application 201810147766.0, the problem of the shape of the quenched wear-resistant steel plate is solved by heating the wear-resistant steel plate in sections and adjusting the quenching cooling water through a heating furnace, and the problem of the shape of the quenched wear-resistant steel plate is solved by adopting a low-temperature quenching process; the Chinese patent application 200580003011.4 performs induction quenching or tempering treatment on the steel plate by an electromagnetic induction heating principle, and the traditional induction furnace heat treatment needs to be subjected to electric-magnetic, magnetic-electric, electric-thermal and other series energy conversion processes, so that the energy utilization efficiency is reduced to a certain extent, and the induction heating often needs to prepare a plurality of groups of induction coil furnaces with different specifications according to the size of a workpiece, so that the field spare parts are more, the circulating cooling system is complex, and the installation and the disassembly are troublesome. In addition, the existing induction furnace heat treatment comprises heating furnace heat treatment, generally wall thickness through thickness heat treatment is carried out on the steel plate, and the actual use requirement of the wear-resistant steel plate which simultaneously requires surface wear resistance and body toughness is difficult to meet.
Therefore, a steel plate heat treatment technology which can improve the surface wear resistance of the wear-resistant steel plate and the toughness of the wear-resistant steel plate body, has high heating energy conversion efficiency, few spare parts of heat treatment equipment and simplified cooling system is further sought, and plays an important role in improving the performance of the wear-resistant steel plate, reducing the cost of the wear-resistant steel plate and promoting the application of the wear-resistant steel plate.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the wear-resistant steel plate and the electric heating quenching method thereof, wherein the electric heating quenching is used for improving the hardness of the surface of the wear-resistant steel plate within a certain depth range, increasing the wear resistance of the steel plate, simultaneously, the wear-resistant steel plate body keeps high plastic toughness, improving the quality and performance of the wear-resistant steel plate, prolonging the service life of the wear-resistant steel plate, and has the advantages of high energy conversion efficiency, few spare parts of a heating furnace and simplified circulating cooling water system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in one aspect, an electric heating quenching method of a wear resistant steel plate includes the steps of:
s1, arranging a steel plate on a conveying roller way;
s2, arranging a vertical pinch roll on the conveying roller way to enable the steel plate to be positioned at the center line position of the conveying roller way;
s3, arranging a horizontal pinch roll on the conveying roller way behind the vertical pinch roll to inhibit buckling deformation of the steel plate;
s4, arranging a first conductive roller, a second conductive roller and a power supply on the conveying roller way behind the horizontal pinch roller in sequence, so that a current conduction loop is formed among the steel plate, the first conductive roller, the second conductive roller and the power supply to electrically heat the steel plate;
s5, arranging a cooler on the conveying roller way behind the second conductive roller, and cooling the surface temperature of the steel plate to the room temperature.
Preferably, in the step S1, the conveying speed V of the conveying roller way is 1-10 m/min.
Preferably, in the step S2, the number of the vertical pinch rolls is at least 1 pair.
Preferably, in the step S3, the number of the horizontal pinch rollers is at least 1 pair.
Preferably, in the step S4, the number of the first conductive rollers and the second conductive rollers is at least 1 pair; and a temperature measuring instrument is further arranged between the second conductive roller and the cooler.
Preferably, in the step S5, the number of the coolers is at least 1 group.
Preferably, the first conductive roller and the second conductive roller adopt conductive slip ring structures, and are made of copper or copper alloy materials;
the power P of the power supply is 1000-5000 kW, and the frequency f is 1-50 kHz.
Preferably, in the step S5, at least 1 pair of horizontal pinch rolls is disposed on the conveying table behind the cooler.
In another aspect, a wear resistant steel sheet is made by the electrical heating and quenching method.
Preferably, the hardness of the surface skin depth range of the steel plate is 40-60 HRC, and the hardness of the core body is 20-30 HRC.
The wear-resistant steel plate and the electric heating quenching method thereof provided by the invention have the following beneficial effects:
1) Compared with the existing induction heating and other modes, the electric energy is directly converted into heat energy by adopting medium-high frequency electric heating, the traditional electric-magnetic-electric-heat conversion process is omitted, and the energy conversion efficiency is high;
2) Compared with the existing induction heating modes and the like, the medium-high frequency electric heating mode is adopted, the wireless ring spare parts and the cooling water system thereof are low in heat treatment cost;
3) And compared with the existing induction heating and other modes, the heat treatment quality and performance of the wear-resistant steel plate are high, and the deformation is small.
Drawings
FIG. 1 is a schematic diagram of an in-situ control of an electrical heating quenching process of the present invention;
FIG. 2 is a schematic diagram of the current loop in the electric heating and quenching method of the present invention;
fig. 3 is a schematic view of the wear resistant steel sheet of the present invention.
Detailed Description
In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 1, the electric heating quenching method of the wear-resistant steel plate provided by the invention comprises the following steps:
s1, arranging a steel plate 1 on a conveying roller way 2, and longitudinally conveying the steel plate by the conveying roller way 2;
s2, arranging at least 1 pair of vertical pinch rolls 3 on the conveying roller way 2 along the conveying direction of the conveying roller way 2, and gradually positioning the steel plate 1 at the central line position of the conveying roller way 2 under the clamping and conveying action of the vertical pinch rolls 3, wherein the vertical pinch rolls 3 can actively rotate with or without driving force;
s3, arranging at least 1 pair of horizontal pinch rolls 4 on the conveying roller way 2 behind the vertical pinch rolls 3 along the conveying direction of the conveying roller way 2, and limiting or inhibiting various warping deformations which possibly exist before or after the heat treatment of the steel plate 1 under the clamping action of the horizontal pinch rolls 4 to prevent the abnormal deformations from possibly colliding and damaging the subsequent first conductive rolls 5, second conductive rolls 6, coolers 8 and the like, wherein the horizontal pinch rolls 4 need a certain clamping force and can adjust the roll spacing, namely the roll gap, of the upper horizontal pinch rolls and the lower horizontal pinch rolls within a certain range so as to ensure that the shape of the steel plate 1 is improved but the longitudinal movement of the steel plate 1 is not blocked;
s4, sequentially arranging at least 1 pair of first conductive rollers 5 and second conductive rollers 6 which are respectively used as positive electrodes and negative electrodes of current on a conveying roller way behind the horizontal pinch rollers 4 along the conveying direction of the conveying roller way 2, forming a current conduction loop together with the steel plate 1 and the power supply 9 to electrically heat the steel plate, and when alternating current passes through the interior of the steel plate 1, having a surface skin effect and an ohmic heat effect, directly converting electric energy into heat energy to enable the surface temperature of the steel plate 1 to be quickly increased to a quenching heating temperature;
s5, arranging at least 1 group of coolers 8 on the conveying roller way behind the second conductive roller 6 along the conveying direction of the conveying roller way 2 for water spray cooling, and rapidly reducing the surface temperature of the steel plate 1 to be close to the room temperature to finish the electric heating quenching heat treatment process.
In the step S1, the conveying speed V of the conveying roller way 2 is 1-10 m/min.
In the step S4, the power P of the power supply 9 is 1000-5000 kW, and the frequency f is 1-50 kHz; a temperature measuring instrument 7 is also arranged between the second conductive roller 6 and the cooler 8 for measuring the surface temperature of the steel plate 1.
The first conductive roller 5 and the second conductive roller 6 are used in pairs in combination with the illustration of fig. 2, so that rolling contact with the steel plate in the rotation process is realized, current is conducted into the steel plate to perform electric heating action on the steel plate, further, the material can be copper or copper alloy material with high conductivity, the structure can be conductive slip ring structure, and 2 pairs of conductive rollers can be arranged in parallel on the upper surface and the lower surface of the steel plate 1.
The invention also provides a wear-resistant steel plate which is manufactured by adopting the electric heating quenching method disclosed by the invention and is shown in the figure 3.
The hardness of the steel plate 1 within the skin depth d range is 40-60 HRC, and the hardness of the core body is 20-30 HRC.
The principle of the electric heating quenching method is that the first conductive roller 5 and the second conductive roller 6 are connected with the positive electrode and the negative electrode of the power supply 9, a closed loop is formed by rolling contact with the steel plate 1 during operation, alternating current mainly flows along a certain depth of the surface of the steel plate 1, namely within a skin depth d range due to skin effect when flowing in the steel plate 1, ohmic heat is directly generated, so that the temperature of the surface layer of the steel plate is quickly raised to reach a preset quenching temperature Tq (generally Tq=920-980 ℃), ferrite-to-austenite transformation and partial carbide solid solution reaction are generated during high temperature, water spray/water mist cooling is carried out in a cooler 8 which is subsequently entered, the surface temperature of the steel plate is quickly reduced to a lower temperature Tc (generally Tc=160-180 ℃) below the martensitic transformation temperature at a cooling speed of more than 50 ℃/s, the austenite is transformed into martensite, a quenched martensitic structure with high hardness and high wear resistance is obtained in the skin depth of the surface of the steel plate, the core part of the steel plate is quickly induced and the core part is kept high in a high hardness and high wear resistance due to the influence of the skin heat conduction of the skin layer, the thermal conductivity is originally, the toughness of the steel plate is difficult to realize the synchronous distribution of the microstructure is realized, the microstructure is high in a high hardness and the toughness is difficult to realize in a rolling plastic profile is realized, and the temperature is a uniform, and the hardness is difficult to realize when the temperature is in a rolling has a hardness is more hardness.
The electric heating quenching technical scheme of the steel plate is slightly adjusted, and can be used for tempering heat treatment process after the abrasion-resistant steel plate is quenched, so that quenching stress is eliminated, and comprehensive usability of the abrasion-resistant steel plate is further improved.
Example 1
The width of the hot rolled steel plate is 1.5m, the thickness is 20mm, and the material NM360 is adopted. (1) the steel sheet 1 is arranged on a conveying roller way 2, v=1m/min; (2) The front end of the conveying roller way 2 is provided with 2 pairs of vertical pinch rollers 3 at intervals, and the steel plate 1 is positioned in the middle of the conveying roller way 2 in the conveying process of the conveying roller way 2; (3) The steel plate 1 is prevented from deforming and colliding with rear equipment by clamping the horizontal pinch rolls 4 by the 1 pair arranged in front of the electrode rolls 5 and behind the vertical pinch rolls 3; (4) The steel sheet 1 is subjected to on-ac heating by 1 set of front side first conductive roller 5 and rear side second conductive roller 6, p=1000 kw, f=10 khz, d=6 mm; (5) Measuring the surface temperature of the steel plate by an infrared thermometer 7, wherein Tq=920 ℃; (6) Performing aerosol cooling through 1 group of coolers 8, wherein the cooling water flow is 40m3/h, the pressure is 0.4MPa, and the temperature Tc of the steel plate after exiting the coolers is 160 ℃; (7) By clamping the horizontal pinch rolls 4 with the pair of pinch rolls 1 arranged behind the cooler 8, the deformation of the steel sheet 1 and the collision to the front side equipment are prevented; (8) And naturally cooling the steel plate by a conveying roller way 2, and cooling the steel plate to room temperature to finish the electric heating quenching process. The hardness of the surface of the quenched steel plate 1 is 45HRC within the thickness range of 6mm, the hardness of the rest core is 25HRC, and the performances of the wear-resistant steel plate such as strength, plasticity and toughness and the like are improved.
Example 2
The width of the hot rolled steel plate is 1.5m, the thickness is 20mm, and the material NM500 is adopted. (1) the steel sheet 1 is arranged on a conveying roller way 2, v=10m/min; (2) The front end of the conveying roller way 2 is provided with 2 pairs of vertical pinch rollers 3 at intervals, and the steel plate 1 is positioned in the middle of the conveying roller way 2 in the conveying process of the conveying roller way 2; (3) The steel plate 1 is prevented from deforming and colliding with rear equipment by clamping the horizontal pinch rolls 4 by the 1 pair arranged in front of the first conductive roll 5 and behind the vertical pinch rolls 3; (4) The steel sheet 1 was subjected to on-ac heating (1 set on the upper surface of the steel sheet 1, and the other 1 set on the upper and lower surfaces of the steel sheet 1) by 2 sets of front side first conductive rollers 5 and rear side second conductive rollers 6, p=5000 kw, f=10 khz, d=6 mm; (5) Measuring the surface temperature of the steel plate by an infrared thermometer 7, wherein Tq=960 ℃; (6) Performing aerosol cooling through 1 group of coolers 8, wherein the cooling water flow is 50m3/h, the pressure is 0.4MPa, and the temperature Tc of a steel plate after exiting the coolers 8 is 160 ℃; (7) By clamping the horizontal pinch rolls 4 with the pair of pinch rolls 1 arranged behind the cooler 8, the deformation of the steel sheet 1 and the collision to the front side equipment are prevented; (8) And naturally cooling the steel plate through the conveying roller way 5, and cooling the steel plate to room temperature to finish the electric heating quenching process. The hardness of the surface of the quenched steel plate 1 within the thickness range of 6mm is 55HRC, the hardness of the rest core parts is 30HRC, the quenching speed is increased, and the efficiency of the wear-resistant steel plate is improved.
Example 3
The width of the hot rolled steel plate is 1.5m, the thickness is 20mm, and the material NM500 is adopted. (1) the steel plate 1 is arranged on a conveying roller way 2, and V=5m/min; (2) The front end of the conveying roller way 2 is provided with 2 pairs of vertical pinch rollers 3 at intervals, and the steel plate 1 is positioned in the middle of the conveying roller way 2 in the conveying process of the conveying roller way 2; (3) The steel plate 1 is prevented from deforming and colliding with rear equipment by clamping the horizontal pinch rolls 4 by the 1 pair arranged in front of the first conductive roll 5 and behind the vertical pinch rolls 3; (4) The steel sheet 1 is subjected to on-ac heating by 1 set of front side first conductive roller 5 and rear side second conductive roller 6, p=2000 kw, f=40 khz, d=3 mm; (5) Measuring the surface temperature of the steel plate by an infrared thermometer 7, wherein Tq=960 ℃; (6) Performing aerosol cooling through 1 group of coolers 4, wherein the flow rate of cooling water is 50m3/h, the pressure is 0.4MPa, and the temperature Tc of a steel plate after exiting the coolers is 160 ℃; (7) By clamping the horizontal pinch rolls 4 with the pair of pinch rolls 1 arranged behind the cooler 4, the deformation of the steel sheet 1 and the collision to the front side equipment are prevented; (8) And naturally cooling the steel plate by a conveying roller way 2, and cooling the steel plate to room temperature to finish the electric heating quenching process. The hardness of the surface of the quenched steel plate 1 is 55HRC within the thickness range of 3mm, the hardness of the rest core is 30HRC, the thickness of the quenched layer is reduced, and the comprehensive performance of the wear-resistant steel plate is improved.
In conclusion, the invention effectively improves the hardness of the surface of the steel plate within a certain depth, effectively increases the wear resistance and the body ductility and toughness of the surface of the steel plate, comprehensively improves the quality and the performance of the wear-resistant steel plate, has good plate shape, high energy conversion efficiency, few spare parts of equipment, simplified cooling water system and low heat treatment cost, and has wide prospect in the application fields of wear-resistant welded pipes, bin hoppers, engineering machinery and the like which require the wear-resistant steel plate.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (10)
1. An electric heating quenching method of a wear-resistant steel plate is characterized by comprising the following steps:
s1, arranging a steel plate on a conveying roller way;
s2, arranging a vertical pinch roll on the conveying roller way to enable the steel plate to be positioned at the center line position of the conveying roller way;
s3, arranging a horizontal pinch roll on the conveying roller way behind the vertical pinch roll to inhibit buckling deformation of the steel plate;
s4, arranging a first conductive roller, a second conductive roller and a power supply on the conveying roller way behind the horizontal pinch roller in sequence, so that a current conduction loop is formed among the steel plate, the first conductive roller, the second conductive roller and the power supply to electrically heat the steel plate;
s5, arranging a cooler on the conveying roller way behind the second conductive roller, and cooling the surface temperature of the steel plate to the room temperature.
2. The electric heating and quenching method of wear resistant steel sheet as set forth in claim 1, wherein: in the step S1, the conveying speed V of the conveying roller way is 1-10 m/min.
3. The electric heating and quenching method of wear resistant steel sheet as set forth in claim 1, wherein: in the step S2, the number of the vertical pinch rolls is at least 1 pair.
4. The electric heating and quenching method of wear resistant steel sheet as set forth in claim 1, wherein: in the step S3, the number of the horizontal pinch rolls is at least 1 pair.
5. The electric heating and quenching method of wear resistant steel sheet as set forth in claim 1, wherein: in the step S4, the number of the first conductive rollers and the second conductive rollers is at least 1 pair, and a thermometer is further arranged between the second conductive rollers and the cooler.
6. The electric heating and quenching method of wear resistant steel sheet as set forth in claim 1, wherein: in the step S5, the number of coolers is at least 1 group.
7. The electric heating and quenching method of wear resistant steel sheet as claimed in claim 4, wherein: the first conductive roller and the second conductive roller are both in conductive slip ring structures, and are made of copper or copper alloy materials;
the power P of the power supply is 1000-5000 kW, and the frequency f is 1-50 kHz.
8. The electric heating and quenching method of wear resistant steel sheet as set forth in claim 1, wherein: in the step S5, at least 1 pair of horizontal pinch rolls are arranged on the conveying table behind the cooler.
9. A wear resistant steel sheet, characterized in that: manufactured by the electric heating and quenching method as claimed in any one of claims 1 to 8.
10. The wear resistant steel sheet according to claim 9, wherein: the hardness of the surface skin depth range of the steel plate is 40-60 HRC, and the hardness of the core body is 20-30 HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210083278.4A CN116536488A (en) | 2022-01-25 | 2022-01-25 | Wear-resistant steel plate and electric heating quenching method thereof |
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| CN202210083278.4A CN116536488A (en) | 2022-01-25 | 2022-01-25 | Wear-resistant steel plate and electric heating quenching method thereof |
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| CN116536488A true CN116536488A (en) | 2023-08-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117890304A (en) * | 2024-03-15 | 2024-04-16 | 内蒙古丰洲材料有限公司 | Steel plate surface defect detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117890304A (en) * | 2024-03-15 | 2024-04-16 | 内蒙古丰洲材料有限公司 | Steel plate surface defect detection system |
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