CN111004973A - Low-alloy medium-carbon wear-resistant steel for low-cost ball mill lining plate and production method thereof - Google Patents
Low-alloy medium-carbon wear-resistant steel for low-cost ball mill lining plate and production method thereof Download PDFInfo
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- 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
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- 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
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- 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
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Abstract
The invention relates to low-cost low-alloy medium-carbon wear-resistant steel for a ball mill lining plate, which comprises the following elements in percentage by mass: c: 0.21-0.38%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.2 to 1.2%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process. In the heating procedure of the production method, the heating time of the plate blank in a heating furnace is 4.0-6.0 h, and the surface temperature at the end of heating is controlled within the range of 1100-1250 ℃; the rolling process adopts a controlled rolling mode to roll, and the initial rolling temperature is 930-1050 ℃; the finishing temperature of the first stage is more than 950 ℃; the initial rolling temperature of the two stages is less than or equal to 880 ℃, the thickness to be heated during the initial rolling of the two stages is more than 3 times of the thickness of a finished steel plate, the cumulative reduction rate of finish rolling is more than or equal to 66%, and the final rolling temperature is controlled within the range of 860-900 ℃. The invention reduces the cost by designing a special component system, and simultaneously obtains the wear-resistant lining plate with fine tempered martensite structure by adopting a method of low-temperature heating and controlled rolling and assisting a proper heat treatment process.
Description
Technical Field
The invention relates to the technical field of metal rolling and heat treatment, in particular to low-cost low-alloy medium-carbon wear-resistant steel for a ball mill lining plate and a production method thereof.
Background
The ball mill is an abrasive device widely applied to industrial departments of mineral separation, building materials, chemical industry, electric power and the like, and a lining plate of the ball mill is one of main consumption parts of the ball mill. The lining plate material of the ball mill is most widely high manganese steel, contains 0.9-1.4 wt% of C and 10-14 wt% of Mn, is a single austenite structure after being subjected to water toughening treatment, is wear-resistant due to a surface hardening effect caused by impact, has initial hardness of 179-229 HBW, and has hardness of 240-350 HBW after being detected; however, in the actual use process, particularly on a small and medium-sized ball mill, because the load impact is small, the high manganese steel does not obtain sufficient work hardening effect, and the impact resistance and wear resistance of the high manganese steel cannot be fully exerted; meanwhile, the yield strength of the lining plate is low, plastic deformation is easy to generate, the lining plate is protruded, and the mounting bolt can be broken when the lining plate is serious, so that the lining plate is difficult to disassemble. Since the high manganese steel has its limitations as a lining plate of a ball mill, various medium and high carbon steels have come into force.
Chinese patent application No. 201810757851.9 discloses a method for preparing a high-chromium alloy lining plate, wherein the content of C is 0.9-1.1 wt%, the content of Cr reaches 18.4wt%, and 0.35wt% of Ni is added, so that the alloy is excessively added, and the cost is too high.
Chinese patent with patent application number 201410286455.4 discloses a 'low alloy lining board special for mines', the content of C is 0.38-0.48 wt%, and the content of Sc: 0.20 to 0.60 wt%, C r: 1.80-2.20 wt%, Lu: less than or equal to 0.50 percent, excessive alloy addition, and high cost due to the addition of rare earth elements.
From the data, the practical idea of the existing medium and high carbon alloy wear-resistant steel is to add high chromium and high carbon to improve hardenability, adopt the design of multi-element alloying components, and increase the carbide content in the medium and high carbon alloy steel structure by properly improving medium and strong carbide forming elements such as Cr, Mo and the like, so that the advantage of the method is that higher strength and hardness can be obtained, but the production cost is too high, the plasticity and the toughness are poor, and especially for equipment which is continuously and repeatedly impacted by a grinding body and materials, the service life of the lining plate can be influenced due to the poor plasticity and the toughness.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides low-alloy medium-carbon wear-resistant steel for a low-cost ball mill lining plate and a production method thereof.
The technical scheme for solving the technical problems is as follows:
the low-cost low-alloy medium-carbon wear-resistant steel for the ball mill lining plate comprises the following elements in percentage by mass: c: 0.21-0.38%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.2 to 1.2%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
The low-alloy medium-carbon wear-resistant steel for the low-cost ball mill lining plate comprises the following elements in percentage by mass: c: 0.22-0.26%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.3 to 0.9%, Ti 0.025 to 0.050%, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
The low-alloy medium-carbon wear-resistant steel for the low-cost ball mill lining plate comprises the following elements in percentage by mass: c: 0.27 to 0.32%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.3 to 1.0%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
The low-alloy medium-carbon wear-resistant steel for the low-cost ball mill lining plate comprises the following elements in percentage by mass: c: 0.28 to 0.32%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.5 to 0.9%, Ti 0.025 to 0.050%, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
The low-alloy medium-carbon wear-resistant steel for the low-cost ball mill lining plate comprises the following elements in percentage by mass: c: 0.33 to 0.38%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.5 to 1.2%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
The low-alloy medium-carbon wear-resistant steel for the low-cost ball mill lining plate comprises the following elements in percentage by mass: c: 0.34 to 0.37%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.7 to 1.1%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
A production method of low-alloy medium-carbon wear-resistant steel for a low-cost ball mill lining plate comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting, heating, controlled rolling, finishing, quenching and tempering; the low-alloy medium-carbon wear-resistant steel comprises the following elements in percentage by mass: c: 0.21-0.38%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.2 to 1.2%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
In the production method of the low-alloy medium-carbon wear-resistant steel for the low-cost ball mill lining plate, in the heating procedure, the heating time of the plate blank in the heating furnace is 4.0-6.0 h, and the surface temperature at the end of heating is controlled within the range of 1100-1250 ℃;
the rolling process adopts a controlled rolling mode to roll, and the initial rolling temperature is 930-1050 ℃; the finishing temperature of the first stage is more than 950 ℃; the initial rolling temperature of the two stages is less than or equal to 880 ℃, the thickness to be heated during the initial rolling of the two stages is more than 3 times of the thickness of a finished steel plate, the cumulative reduction rate of finish rolling is more than or equal to 66%, and the final rolling temperature is controlled within the range of 860-900 ℃.
According to the production method of the low-alloy medium-carbon wear-resistant steel for the low-cost ball mill lining plate, in the quenching process, the quenching heating temperature is 850-920 ℃, the in-furnace time coefficient of the steel plate during quenching is 1.7 min/mm-2.1 min/mm, the cooling medium is water after quenching, and the quenching cooling speed is 20-40 ℃/S;
in the tempering process, the tempering heating temperature is 150-400 ℃, the furnace time coefficient during tempering of the steel plate is 2.5 min/mm-4.5 min/mm, and the tempering cooling mode is air cooling.
According to the production method of the low-alloy medium-carbon wear-resistant steel for the lining plate of the low-cost ball mill, the O content in the steel is controlled to be below 400ppm in the converter smelting process, the slag amount during steel tapping is controlled to be below 0.005% of the amount of molten steel, the cleanliness of the molten steel is ensured, ferrochrome is added after oxygen blowing is finished, and the alloy is ensured to fully exert microalloying effect;
in the LF refining process, the refining time is controlled to be more than 35min, w (Al) is more than or equal to 0.035wt% after slagging is finished, then ferrotitanium is added for microalloying, and ferroboron is added to improve the effective boron content; the net blowing time is guaranteed to be more than or equal to 6min before the steel is out of the station, and the level sum of inclusions in the steel is effectively controlled not to exceed 1.0 level;
in the continuous casting process, the overheating temperature of molten steel is controlled within the range of 8-35 ℃, and the whole drawing speed is controlled within the range of 0.75-0.95 m/min; stacking and slowly cooling the casting blanks off the line for 24-36 h;
the low-alloy medium-carbon wear-resistant steel for the low-cost ball mill lining plate has the advantages that the thickness of the wear-resistant steel plate is 6-45 mm; the surface Brinell hardness is 450 to 580HBW, the core Brinell hardness is 420 to 550HBW, and the impact energy is between 27 to 60J.
In order to ensure that the hardness and the impact toughness meet the requirements, the invention adopts the methods of laboratory research, pilot test and field verification to obtain various process parameters:
a: in order to ensure that the components meet the requirements, the design idea is as follows: c is an important element for ensuring the hardness and the wear resistance of the steel material, but for quenched and tempered steel, when the carbon content is too high, a coarse martensite structure can be obtained after quenching, so that the brittleness is increased, the plastic toughness and the welding performance are deteriorated, and hot cracks can easily appear in the production process and the flame cutting processing process, so that the weight percentage of C in the medium-carbon and low-carbon range is 0.21-0.38%; the main effect of Si in the alloy steel is solid solution strengthening, but the silicon can reduce the toughness of the steel, the Si can achieve the solid solution strengthening effect, the toughness cannot be greatly influenced, and the weight percentage of the Si is designed to be 0.17-0.27%; mn can improve the hardenability of steel, but when the content of Mn is too high, the temper brittleness of the material can be increased, and meanwhile, component segregation is caused, and inclusions such as MnS and the like are formed, so that the control range of Mn in the invention can improve the hardenability, and simultaneously, the inclusions and the segregation are reduced, and the weight percentage of Mn is designed to be 0.5-1.6%; cr can improve the hardenability of steel in steel materials, and simultaneously, a plurality of carbides are partially formed to play a role in dispersion strengthening, but the addition of Cr is too much, so that the cost is increased, and the production difficulty is increased. The Cr of the invention can not only improve the hardenability, but also control the cost to increase, and the weight percentage of the designed Cr is as follows: 0.2-1.2%; ti can be combined with C to form micron-sized superhard alloy particles, meanwhile Ti can fix N to prevent the combination of N and B of steel grade and form invalid BN, so that the impact toughness is reduced, and the weight percentage of Ti is designed to be 0.012-0.050%; b is an element for improving hardenability of steel, and when B exceeds a certain amount, it does not actually contribute to hardenability of steel any more, and therefore, the total content of boron should be controlled to be B: 0.0010-0.0020 wt%; meanwhile, in order to prevent the N content in the steel from being too high, and Ti and B form precipitates such as TiN and BN, and the impact toughness of the steel is reduced, the N is less than or equal to 80 ppm.
b: according to the control technology of key alloys Ti and B in the alloy steel, in order to reduce the oxidation of Ti and enable the Ti to have good nitrogen fixation effect, converter tapping is pre-deoxidized, and aluminum control and strong deoxidation are carried out at the initial stage of refining. Experiments show that when the content of the aluminum w (Al) is more than or equal to 0.035wt percent, the titanium iron is added, so that the yield of the titanium alloy is improved; in order to stabilize the yield of boron and avoid boron nitridation, ferroboron should be added after ferrotitanium.
C: the invention researches the relationship between different heating temperatures and grain sizes, when the heating temperature is 1150 ℃, the grain size is about 100 mu m, when the heating temperature is more than 1200 ℃, the grain size is increased sharply and reaches more than 200 mu m, according to the actual production situation, the deviation between the heating temperature of the steel plate and the furnace temperature is 50-60 ℃, simultaneously considering the plate shape, the rolling difficulty and the surface quality during rolling, the final furnace temperature is determined to be 1100-1250 ℃, the grain size of the obtained original austenite is less than or equal to 250 mu m, and simultaneously the oxidation phenomenon of the surface of the steel plate can be reduced in the temperature interval, and the surface quality of the steel plate is improved.
The invention has the beneficial effects that:
the 25CrMnB low-alloy wear-resistant steel produced by the process has a microstructure of tempered martensite with small size, the surface Brinell hardness of 450-480 HBW, the core Brinell hardness of 420-450 HBW and the impact energy of 27-60J.
The 30CrMnB low-alloy wear-resistant steel produced by the process has a microstructure of tempered martensite with small size, the surface Brinell hardness of 500-530 HBW, the core Brinell hardness of 470-500 HBW and the impact energy of 27-60J.
The 35CrMnB low-alloy wear-resistant steel produced by the process has a microstructure of tempered martensite with small size, the surface Brinell hardness of 550-580 HBW, the core Brinell hardness of 520-550 HBW and the impact energy of 27-40J.
The low-alloy medium-carbon wear-resistant steel product for the ball mill lining plate produced by the process has the advantages of low cost, high strength and wear resistance, and good impact toughness, solves the problems of high cost and troublesome installation and use of the ball mill lining plate, particularly under the promotion of environmental protection pressure and green manufacture, the ball mill lining plate produced by the process can completely replace a cast high-manganese wear-resistant lining plate on medium and small ball mills, and has high popularization value.
Drawings
FIG. 1 is a microstructure (1000 times) of a 25CrMnB steel sheet produced in example 1 after heat treatment;
FIG. 2 is a microstructure (1000 times) of a 30CrMnB steel sheet produced in example 2 after heat treatment;
FIG. 3 is a microstructure (1000 times) of a 35CrMnB steel sheet produced in example 3 after heat treatment;
FIG. 4 is a microstructure view (1000 times) of a 25CrMnB steel sheet produced in example 4 after heat treatment;
FIG. 5 is a microstructure view (1000 times) of a 30CrMnB steel sheet produced in example 5 after heat treatment;
FIG. 6 is a microstructure (1000 times) of a 35CrMnB steel sheet produced in example 6 after heat treatment;
FIG. 7 is a microstructure view (1000 times) of a 25CrMnB steel sheet produced in example 7 after heat treatment;
FIG. 8 is a microstructure view (1000 times) of a 30CrMnB steel sheet produced in example 8 after heat treatment;
FIG. 9 is a microstructure view (1000 times) of a 35CrMnB steel sheet produced in example 9 after heat treatment;
FIG. 10 is a microstructure view (1000 times) of a 25CrMnB steel sheet produced in example 10 after heat treatment;
FIG. 11 is a microstructure view (1000 times) of a 30CrMnB steel sheet produced in example 11 after heat treatment;
FIG. 12 is a microstructure view (1000 times) of a 35CrMnB steel sheet produced in example 12 after heat treatment;
FIG. 13 is a microstructure view (1000 times) of a 25CrMnB steel sheet produced in example 13 after heat treatment;
FIG. 14 is a microstructure view (1000 times) of a 30CrMnB steel sheet produced in example 14 after heat treatment;
FIG. 15 is a microstructure (1000 times) of a 35CrMnB steel sheet produced in example 15 after heat treatment.
Detailed Description
The present invention is further illustrated by the following specific examples 1 to 15:
in the embodiment 1-15, a 260mm large-section continuous casting billet is selected to ensure a compression ratio, and 25CrMnB, 30CrMnB and 35CrMnB finished steel products with the thickness specification of 6 mm-45 mm are produced; in the converter smelting process, the O content in steel is controlled to be below 400ppm, the slag amount during steel tapping is controlled to be below 0.005% of the molten steel amount, the cleanliness of the molten steel is ensured, ferrochrome is added after oxygen blowing is finished, and the microalloying effect of the alloy is fully exerted; in the LF refining process in steelmaking production, the refining time is controlled to be more than 35min, and the nitrogen absorption of molten steel is prevented by the whole micro-positive pressure operation; lime, aluminum wires and aluminum particles are adopted to produce white slag for desulfurization, slag is rapidly formed, the gas flow is reasonably controlled in the desulfurization process, and large-gas stirring is strictly forbidden; adjusting components of ferromanganese, ferrosilicon, aluminum wires and ferrotitanium, adjusting Als after desulfurizing white slag formed in the later period of LF, adding ferrotitanium for microalloying 10-15 min before refining is finished, and performing soft blowing for not less than 3min before sampling after the sub-adjustment is finished; the outbound Ca is more than or equal to 25ppm, and the grade sum of the inclusions in the steel grade is effectively controlled not to exceed 1.0 grade; in the continuous casting process, the whole process of protective casting is carried out, electromagnetic stirring and dynamic soft reduction in a secondary cooling area are used, the overheating temperature of molten steel is stably controlled within the range of 8-35 ℃, and the drawing speed is controlled within the range of 0.75-0.95 m/min in the whole process; and (4) carrying out stacking and slow cooling on the casting blank, wherein the cooling time is 24-36 h.
According to the method, the tested 25CrMnB, 30CrMnB and 35CrMnB finished steel products with the thickness specification of 6-45 mm have the chemical components with the mass percentage (wt%) shown in the table 1, the smelting process shown in the table 2, the rolling and heat treatment processes shown in the tables 3 and 4, and the mechanical property detection results shown in the table 5:
TABLE 1 chemical composition (wt%, balance Fe) of each example
TABLE 2 smelting Process parameters of the examples
TABLE 3 controlled Rolling and Heat treatment Process parameters for the examples
TABLE 4 controlled Rolling and Heat treatment Process parameters for the examples
TABLE 5 mechanical Properties of the examples
Examples 1-15 show that the mechanical properties of the produced 25CrMnB, 30CrMnB and 35CrMnB steel plates completely meet the requirements of users; as can be seen from fig. 1 to 15, the microstructures of the steel sheets of the examples were fine tempered martensite.
Claims (10)
1. Low-cost ball mill low-alloy medium carbon wear-resistant steel for welt, its characterized in that: the steel comprises the following elements in percentage by mass: c: 0.21-0.38%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.2 to 1.2%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
2. The low-cost, medium-carbon, low-alloy, wear-resistant steel for ball mill liners, according to claim 1, wherein: the steel comprises the following elements in percentage by mass: c: 0.22-0.26%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.3 to 0.9%, Ti 0.025 to 0.050%, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
3. The low-cost, medium-carbon, low-alloy, wear-resistant steel for ball mill liners, according to claim 1, wherein: the steel comprises the following elements in percentage by mass: c: 0.27 to 0.32%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.3 to 1.0%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
4. The low-cost, medium-carbon, low-alloy, wear-resistant steel for ball mill liners, according to claim 1, wherein: the steel comprises the following elements in percentage by mass: c: 0.28 to 0.32%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.5 to 0.9%, Ti 0.025 to 0.050%, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
5. The low-cost, medium-carbon, low-alloy, wear-resistant steel for ball mill liners, according to claim 1, wherein: the steel comprises the following elements in percentage by mass: c: 0.33 to 0.38%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.5 to 1.2%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
6. The low-cost, medium-carbon, low-alloy, wear-resistant steel for ball mill liners, according to claim 1, wherein: the steel comprises the following elements in percentage by mass: c: 0.34 to 0.37%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.7 to 1.1%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
7. A production method of low-alloy medium-carbon wear-resistant steel for a low-cost ball mill lining plate comprises the working procedures of converter smelting, LF refining, RH refining, continuous casting, heating, controlled rolling, finishing, quenching and tempering; the method is characterized in that: the low-alloy medium-carbon wear-resistant steel comprises the following elements in percentage by mass: c: 0.21-0.38%, Si: 0.17 to 0.27%, Mn: 0.5-1.6%, Cr: 0.2 to 1.2%, 0.012 to 0.050% of Ti, ALs: 0.015-0.045%, B: 0.0010-0.0020 percent, less than or equal to 80ppm of N, and the balance of Fe and inevitable residual elements and impurities in the production process.
8. The method for producing low-alloy medium-carbon abrasion-resistant steel for the low-cost ball mill lining plate according to claim 7, wherein the method comprises the following steps: in the heating procedure, the heating time of the plate blank in the heating furnace is 4.0-6.0 h, and the surface temperature at the heating end time is controlled within the range of 1100-1250 ℃;
the rolling process adopts a controlled rolling mode to roll, and the initial rolling temperature is 930-1050 ℃; the finishing temperature of the first stage is more than 950 ℃; the initial rolling temperature of the two stages is less than or equal to 880 ℃, the thickness to be heated during the initial rolling of the two stages is more than 3 times of the thickness of a finished steel plate, the cumulative reduction rate of finish rolling is more than or equal to 66%, and the final rolling temperature is controlled within the range of 860-900 ℃.
9. The method for producing low-alloy medium-carbon abrasion-resistant steel for the low-cost ball mill lining plate according to claim 7, wherein the method comprises the following steps: in the quenching process, the quenching heating temperature is 850-920 ℃, the in-furnace time coefficient of the steel plate during quenching is 1.7 min/mm-2.1 min/mm, the cooling medium is water after quenching, and the quenching cooling speed is 20-40 ℃/S;
in the tempering process, the tempering heating temperature is 150-400 ℃, the furnace time coefficient during tempering of the steel plate is 2.5 min/mm-4.5 min/mm, and the tempering cooling mode is air cooling.
10. The low-cost medium carbon, abrasion-resistant steel for ball mill liners according to any of claims 1 to 6, wherein: the thickness of the wear-resistant steel plate is 6-45 mm; the surface Brinell hardness is 450 to 580HBW, the core Brinell hardness is 420 to 550HBW, and the impact energy is between 27 to 60J.
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