Profile steel roller performance heat treatment method

Abstract

The invention relates to a profile steel roller performance heat treatment method, belongs to the technical field of heat treatment, and solves the problems of heavy pollution, poor working environment, high cost and fire risk caused by quenching and tempering heat treatment and oil cooling in a profile steel roller performance heat treatment method in the prior art. The method comprises the following steps: S1, preheating; s2, a first heating and heat preservation step; s3, a second heating and heat preservation step; s4, an air cooling step; s5, carrying out isothermal annealing; s6, a first slow cooling step; and S7, slow cooling for the second time. Air cooling is selected for cooling, an isothermal annealing mode is adopted subsequently, it is ensured that the product meets the technical requirements for hardness, performance and the like, and meanwhile the purposes of being environmentally friendly and reducing energy consumption and cost are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat treatment, in particular to a performance heat treatment method of a section steel roller. BACKGROUND

[0002] As a key component in a steel rolling device, the performance of a section steel roller directly determines the rolling efficiency, product quality and service life of the roller itself. During operation, the section steel roller needs to withstand strong friction, wear, impact, contact stress for a long time, and the quenching and heating effect caused by the alternating action of hot steel and cooling liquid. Therefore, an excellent section steel roller must have high strength, high toughness, excellent thermal cracking resistance, peeling resistance and wear resistance.

[0003] In order to obtain the above-mentioned comprehensive performance, the "quenching and tempering heat treatment" is generally used as the final performance heat treatment process of the section steel roller in current industrial production. The process usually includes the key step of quenching (oil cooling). Among them, oil cooling as a quenching medium can ensure that the workpiece obtains the required martensite structure to achieve high strength and high hardness, but a series of problems also increasingly emerge: the cost of quenching oil is high and needs to be replaced regularly, in addition, regular detection of viscosity, flash point, acid value and other indicators and cleaning of impurities in the oil tank will also increase the cost. Quenching oil as a flammable material is easy to cause fire and even explosion, which brings unnecessary trouble to the operation, management and protection of the production site. The oil cooling process also produces a large amount of oil fumes, pollutes the workshop air and damages the health of workers. Therefore, it is urgent to consider the possibility of other cooling methods and process optimization to achieve the purpose of green environmental protection, energy saving and cost reduction. SUMMARY

[0004] In view of the above analysis, the embodiments of the present application aim to provide a performance heat treatment method of a section steel roller to solve the problems of pollution, poor working environment, high cost and fire risk of the existing oil cooling cooling method.

[0005] The present application provides a performance heat treatment method of a section steel roller, comprising the following steps:

[0006] S1: preheating step;

[0007] S2: first temperature rising and holding step;

[0008] S3: second temperature rising and holding step;

[0009] S4: air cooling step;

[0010] S5: isothermal annealing step;

[0011] S6: first slow cooling step;

[0012] S7: second slow cooling step.

[0013] Further, S1 preheating step: heat treatment furnace at 250-300 DEG C for 1-10h.

[0014] Further, in S2 first temperature rising and holding step, the temperature is raised to 600-670 DEG C at a speed of not more than 60 DEG C / h, and the holding time is 2-12h.

[0015] Further, in S3 second temperature rising and holding step, the temperature is raised to 820-880 DEG C at a speed of not more than 70 DEG C / h, and the holding time is 8-34h.

[0016] Further, S4 air cooling, ensure that the surface temperature of each diameter of the roll is 550-650 DEG C.

[0017] Further, in S5 isothermal annealing step, the temperature is held in the heat treatment furnace at 590-630 DEG C for 30-80h.

[0018] Further, in S5 isothermal annealing step, the surface and a certain depth of each diameter of the roll are controlled at 590-630 DEG C.

[0019] Further, in S6 first slow cooling step, the temperature is lowered to 390-410 DEG C at a speed of not more than 30 DEG C / h.

[0020] Further, in S7 second slow cooling step, the temperature is lowered to 190-210 DEG C at a speed of not more than 20 DEG C / h.

[0021] In another aspect, the present application provides a section steel roll, the microstructure of the roll neck and roll body of the section steel roll is lamellar pearlite.

[0022] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0023] 1. Traditional oil cooling produces a large amount of oil smoke and volatile organic compounds, seriously polluting the workshop and atmospheric environment. The section steel roll performance heat treatment method of the present application realizes that oil quenching treatment is not needed, and the key indicators of the section steel roll are stable and meet the technical requirements through the processes of strict preheating, first temperature rising, second temperature rising, air cooling, isothermal annealing, first slow cooling and second slow cooling. During the period, air cooling is adopted, realizing "zero oil smoke" emission, greatly improving the working environment, and meeting the strict requirements of national green manufacturing and environmental protection regulations.

[0024] 2. Quenching oil is a flammable and explosive product, and the risk of contacting high-temperature workpieces is extremely high, which is a major hazard source of heat treatment workshops. The section steel roll performance heat treatment method of the present application completely abandons quenching oil, eliminates this safety hazard from the root, and makes the production site safer.

[0025] 3, The type steel roller performance heat treatment method of the application obtains the roller body and the roller neck of the type steel roller, and the microstructure of the roller body and the roller neck is all flaky pearlite, the microstructure is very uniform, and the tensile strength of the type steel roller is greater than or equal to 869 MPa, the yield strength is greater than or equal to 446 MPa, the hardness is 43-47 HSD, and the impact energy is greater than or equal to 25 J, and the key indexes such as the hardness, the tensile strength, the yield strength and the impact energy all stably reach the technical requirements of the type steel roller, and the process is reliable.

[0026] In the application, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the application will be described in the subsequent description, and some advantages will become apparent from the description, or will be understood by implementing the application. The purposes and other advantages of the application can be realized and obtained from the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and are used to explain the principles of the application, but are not used to limit the scope of the application.

[0028] Figure 1 is a performance heat treatment curve for a hot-rolled roller;

[0029] Figure 2 is a microstructure of a roller body of example 1;

[0030] Figure 3 is a microstructure of a roller neck of example 1;

[0031] Figure 4 is a microstructure of a roller body of example 2;

[0032] Figure 5 is a microstructure of a roller neck of example 2. DETAILED DESCRIPTION

[0033] The preferred embodiments of the application are specifically described below in combination with the drawings, wherein the drawings constitute a part of this application, and are used to explain the principles of the embodiments of the application, but are not used to limit the scope of the application.

[0034] The application provides a type steel roller performance heat treatment method, which comprises the following steps:

[0035] S1: a preheating step;

[0036] S2: a first temperature rising and holding step;

[0037] S3: a second temperature rising and holding step;

[0038] S4: an air cooling step;

[0039] S5: an isothermal annealing step;

[0040] S6: first slow cooling step;

[0041] S7: second slow cooling step.

[0042] Different from the "quenching (oil cooling) key step" mode of the "heat treatment" mode commonly used in current industrial production, the present application adopts the processes of preheating, first temperature rising, second temperature rising, air cooling, isothermal annealing, first slow cooling and second slow cooling, so that the steel roller can be obtained without oil quenching treatment, and the key indicators are stable and meet the technical requirements.

[0043] Further, in the S1 preheating step: heat preservation in a 250-300℃ heat treatment furnace for 1-10h.

[0044] Further, in the S2 first temperature rising and heat preservation step, the temperature is raised to 600-670℃ at a speed of not more than 60℃ / h, and the heat preservation time is 2-12h.

[0045] Further, in the S3 second temperature rising and heat preservation step, the temperature is raised to 820-880℃ at a speed of not more than 70℃ / h, and the heat preservation time is 8-34h.

[0046] Specifically, in the S1 preheating step, the temperature difference between the inside and outside of the workpiece is reduced to prevent excessive thermal stress caused by rapid heating in the subsequent process. For example, the preheating temperature in step S1 can be 250℃, 260℃, 270℃, 280℃, 290℃, 300℃, and the heat preservation time can be 1h, 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h.

[0047] If the temperature of the S1 preheating step is too high or the heat preservation time is too long, although it usually does not affect the internal performance after the final processing, the additional cost is completely out of proportion to the tiny benefit obtained, causing waste of resources.

[0048] If the temperature of the S1 preheating step is too low or the heat preservation time is too short, the workpiece enters the subsequent rapid heating stage with a large amount of original residual stress. The thermal stress and residual stress are superimposed, which is extremely likely to cause deformation or cracking of the workpiece in the subsequent heating or cooling process.

[0049] The step S2 first temperature rising and heat preservation is a uniform temperature stage of the key intermediate temperature platform. Further reduce the temperature difference between the core and the surface of the workpiece to prevent excessive thermal stress caused by excessive temperature difference, and prepare for the subsequent high temperature heating to reduce the uniform temperature time in the high temperature stage.

[0050] If the first temperature rising and holding in S2 is too fast, and the holding time is too short, the workpiece will enter the next stage with a huge temperature difference between the inside and the outside, and the thermal stress will increase sharply in the subsequent faster temperature rising, increasing the risk of cracking. For example, the first temperature rising and holding in S2 can be at 600°C, 610°C, 620°C, 630°C, 640°C, 650°C, 660°C, 670°C, and the holding time can be 2h, 3h, 4h, 5h, 6h, 7h, 8h, 9h, 10h, 11h, 12h.

[0051] In the first temperature rising and holding in S2, the temperature is raised to 600-670°C at a rate not greater than 60°C / h, and the temperature rising rate can be 60°C / h, 50°C / h, 40°C / h, 30°C / h, 20°C / h, 10°C / h.

[0052] The second temperature rising and holding in S3 is an austenitizing stage. The steel is heated to the austenite phase region and held to completely transform the original pearlite and other organizations into uniform austenite, and to complete recrystallization, further refining the grains in the post-forging heat treatment state, providing a uniform and fine initial organization for subsequent performance control.

[0053] For example, the second temperature rising and holding in S3 can be at 820°C, 830°C, 840°C, 850°C, 860°C, 870°C, 880°C, and the holding time can be 8h, 9h, 10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h, 18h, 19h, 20h, 21h, 22h, 23h, 24h, 25h, 26h, 27h, 28h, 29h, 30h, 31h, 32h, 33h, 34h.

[0054] In the second temperature rising and holding in S3, the temperature is raised to 820-880°C at a rate not greater than 70°C / h, and the temperature rising rate can be 70°C / h, 60°C / h, 50°C / h, 40°C / h, 30°C / h, 20°C / h, 10°C / h.

[0055] If the temperature rising speed in S3 is too slow, the temperature is too high, or the holding time is too long, coarse and uneven austenite grains will be obtained, which will lead to uneven final transformation products (pearlite), directly affecting the hardness uniformity and strength and toughness of the workpiece. Even if subsequent air cooling and isothermal annealing are performed, the coarse austenite grains will be inherited by the final organization, resulting in coarse pearlite groups, which will significantly reduce the impact toughness of the material and increase the brittleness.

[0056] If the temperature of S3 is too low or the holding time is too short, the austenitizing is not sufficient: the austenite composition is not uniform, or it cannot be fully austenitized, the final organization is poor, resulting in mixed organization (such as pearlite + unsolved carbide or atypical organization) after isothermal annealing, and uniform mechanical properties cannot be obtained, and the strength and hardness may not meet the requirements.

[0057] Further, S4 air cooling ensures that the surface temperature of the roll is 550-650℃.

[0058] Step S4 air cooling effect: through air cooling, the surface temperature of the workpiece is accurately reduced to 550-650℃. This temperature range is the temperature range in which the supercooled austenite is most likely to decompose into fine lamellar pearlite. This prepares for the next step of isothermal annealing (step S5), ensuring that the organization transformation can start quickly and uniformly. For example, step S4 air cooling ensures that the surface temperature of the roll is 550℃, 560℃, 570℃, 580℃, 590℃, 600℃, 610℃, 620℃, 630℃, 640℃, 650℃.

[0059] If the S4 air cooling temperature is too low, it will form bainite or martensite with higher hardness but poor plasticity and toughness, or make the driving force of pearlite transformation too large during subsequent isothermal annealing, forming too fine pearlite, resulting in too high hardness, which is not consistent with the purpose of the present application, and increases the risk of cracking.

[0060] If the S4 air cooling temperature is too high, the austenite will transform into coarse pearlite, resulting in insufficient strength and hardness. The austenite is too stable, and the transformation process will be very slow at the beginning of the subsequent isothermal annealing, and coarse pearlite organization is easy to form, resulting in insufficient strength and hardness.

[0061] Further, in the S5 isothermal annealing step, the temperature is kept at 590-630℃ for 30-80h.

[0062] Further, in the S5 isothermal annealing step, the temperature of the surface and a certain depth of 0-100mm is controlled at 570-650℃.

[0063] Specifically, the profiled steel roller is quickly moved into and kept in a furnace at a temperature of 590-630 °C for long-term isothermal transformation. At this temperature, the supercooled austenite will isothermally decompose into lamellar pearlite structure. By precisely controlling the temperature and time, it can be ensured that the entire workpiece working layer completes this transformation, thereby obtaining uniform hardness and good strength and toughness. Instead of the complex process of "obtaining martensite by quenching + high-temperature tempering" in the traditional quenching and tempering process, the performance requirements are directly met by controlling the pearlite transformation. For example, the S5 isothermal annealing temperature can be 570 °C, 580 °C, 590 °C, 600 °C, 610 °C, 620 °C, 630 °C, and the holding time can be 30 h, 31 h, 32 h, 33 h, 34 h, 35 h, 36 h, 37 h, 38 h, 39 h, 40 h, 41 h, 42 h, 43 h, 44 h, 45 h, 46 h, 47 h, 48 h, 49 h, 50 h, 51 h, 52 h, 53 h, 54 h, 55 h, 56 h, 57 h, 58 h, 59 h, 60 h, 61 h, 62 h, 63 h, 64 h, 65 h, 66 h, 67 h, 68 h, 69 h, 70 h, 71 h, 72 h, 73 h, 74 h, 75 h, 76 h, 77 h, 78 h, 79 h, 80 h.

[0064] If the S5 isothermal annealing temperature is too low or the holding time is too short: the formed pearlite lamella is too fine, or other structures cannot meet the strength and hardness requirements.

[0065] If the S5 isothermal annealing temperature is too high or the holding time is too long: the formed pearlite is too coarse, and the hardness and strength will decrease.

[0066] Further, in the S6 first slow cooling step, the temperature is decreased to 390-410 °C at a rate of not greater than 30 °C / h.

[0067] The cooling rate of the S6 first slow cooling can be 30 °C / h, 20 °C / h, 10 °C / h.

[0068] If the cooling rate in S6 is too large, the temperature difference between the inside and outside of the workpiece is large, the previous organizational stress is superimposed, and the cracking possibility of the workpiece is increased.

[0069] In the S6, the elastic-plastic region transition point of the material in this step is about 400 °C, so the furnace temperature is selected to be 390-410 °C, and the cooling rate is small at this point in order to reduce the thermal stress caused by the temperature difference between the inside and outside. Further, in the S7 second slow cooling step, the temperature is decreased to 190-210 °C at a rate of not greater than 20 °C / h. The core purpose of this step is to "safely pass through the brittle zone and maximize the elimination of residual stress". After cooling to 390-410 °C in the S6 step, it has entered a range with high cold hardening and brittleness, in order to avoid cracking and reduce instantaneous stress, the S7 second slow cooling step adopts a slower cooling rate.

[0070] The temperature decreasing rate of the S7 second slow cooling can be 20℃ / h, 10℃ / h. In this stage, the cold hardening and brittleness are larger, so a smaller cooling rate is adopted. If the temperature decreasing rate is too large, the overall residual stress of the workpiece is too large, and the workpiece is prone to cracking.

[0071] The microstructure of the roll body and the roll neck of the section steel roll obtained by the above-mentioned section steel roll performance heat treatment method is all flaky pearlite, and the structure is very uniform. The tensile strength of the section steel roll is greater than or equal to 869 MPa, the yield strength is greater than or equal to 446 MPa, the hardness is 43-47 HSD, and the impact energy is greater than or equal to 25 J, which meets the performance technical requirements of the section steel roll: the hardness is 40-50 HSD, the tensile strength is greater than 800 MPa, the yield strength is greater than 400 MPa, and the impact energy is greater than 20 J, and the process is reliable.

[0072] The present application is suitable for section steel roll forgings with a diameter of 500-1700 mm.

[0073] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with specific embodiments.

[0074] Example 1

[0075] The present embodiment provides a preparation method of a section steel roll forging with a roll body diameter of 1650 mm and a roll neck diameter of 770 mm. The method comprises the following steps:

[0076] S1 preheating step: 250℃ for 10h.

[0077] S2 first temperature increasing and holding step: increasing the temperature to 600℃ at a speed of 60℃ / h, and holding for 11h.

[0078] S3 second temperature increasing and holding step: increasing the temperature to 880℃ at a speed of 70℃ / h, and holding for 33h.

[0079] S4 air cooling step: air cooling to ensure that the surface temperature of each diameter of the roll is 550-650℃.

[0080] S5 isothermal annealing step: 590℃ for 80h.

[0081] S6 first slow cooling step: decreasing the temperature to 390℃ at a speed of 30℃ / h.

[0082] S7 second slow cooling step: decreasing the temperature to 190℃ at a speed of 20℃ / h.

[0083] Example 2

[0084] A preparation method of a section steel roll forging with a roll body diameter of 1025 mm and a roll neck diameter of 720 mm is prepared, which comprises the following steps:

[0085] S1 preheating step: 300℃ holding, holding time 5h.

[0086] S2 first temperature rising and holding step: temperature rising to 670℃ at a rate of 50℃ / h, holding for 6h.

[0087] S3 second temperature rising and holding step: temperature rising to 820℃ at a rate of 60℃ / h, holding for 21h.

[0088] S4 air cooling step: air cooling, ensuring the surface temperature of each diameter of the roll is 550-650℃.

[0089] S5 isothermal annealing step: 630℃ holding, holding time 50h.

[0090] S6 first slow cooling step: temperature dropping to 410℃ at a rate of 30℃ / h.

[0091] S7 second slow cooling step: temperature dropping to 210℃ at a rate of 20℃ / h.

[0092] Example 3

[0093] The present example provides a method for preparing a steel roll forging with a roll body diameter of 695mm and a roll neck diameter of 350mm, comprising the following steps:

[0094] S1 preheating step: 250℃ holding, holding time 2h.

[0095] S2 first temperature rising and holding step: temperature rising to 600℃ at a rate of 60℃ / h, holding for 3h.

[0096] S3 second temperature rising and holding step: temperature rising to 880℃ at a rate of 70℃ / h, holding for 14h.

[0097] S4 air cooling step: air cooling, ensuring the surface temperature of each diameter of the roll is 550-650℃.

[0098] S5 isothermal annealing step: 590℃ holding, holding time 35h.

[0099] S6 first slow cooling step: temperature dropping to 390℃ at a rate of 30℃ / h.

[0100] S7 second slow cooling step: temperature dropping to 190℃ at a rate of 20℃ / h.

[0101] Comparative Example 1

[0102] S3 second temperature rising and holding step: temperature rising to 980℃ at a rate of 80℃ / h, holding for 40h, and the rest is the same as Example 1.

[0103] Comparative Example 2

[0104] S4 air cooling step: air cooling, ensuring that the surface temperature of each diameter of the roller is <500℃; the rest is the same as example 1.

[0105] Comparative example 3

[0106] S5 isothermal annealing step: 680℃ for 80h; the rest is the same as example 1.

[0107] Comparative example 4

[0108] S2 first temperature rising and holding step: rising to 700℃ at a speed of 120℃ / h, holding for 2h, the rest is the same as example 1.

[0109] Comparative example 5

[0110] S6 first slow cooling step: cooling to 410℃ at a speed of 100℃ / h, the rest is the same as example 1.

[0111] Performance detection

[0112] The tensile, impact and hardness of examples 1-3 and comparative examples 1-5 are detected at room temperature, and the detection results are shown in table 1. The tensile test is performed according to GB / T 228, the impact test is performed according to GB / T 229, and the hardness is performed according to GB / T 4340, and the results are shown in table 1, and the microstructure is detected according to GB / T 5168-2020, as shown in table 1. Figures 2-5

[0113] Table 1 performance detection results of examples 1-3 and comparative examples 1-5

[0114]

[0115]

[0116] From table 1, it can be seen that by examples 1, 2 and 3, the tensile strength of the profile roller prepared by the performance heat treatment method of the profile roller of the application is ≥869MPa, the yield strength is ≥446MPa, the hardness is 43-47HSD, and the impact energy is ≥25J. The performance of the profile roller prepared by the application meets the technical requirements of the profile roller: tensile strength >800MPa, yield strength >400MPa, hardness 40-50HSD, and impact energy >20J. Combined with Figures 2-5 It can be seen that the microstructure of the neck and body of the profile roller prepared by the performance heat treatment method of the application is lamellar pearlite, and the structure is uniform.

[0117] From table 1, it can be seen that the profile rollers of comparative examples 1-3 do not meet the performance or hardness technical requirements of the profile roller, and comparative examples 4-5 crack due to excessive stress.

[0118] ​In Comparative Example 1, the austenitizing temperature during the second heating and holding step in S3 was too high, resulting in coarse austenite grains. Although the pearlite transformation was completed, the coarse grains led to a decrease in toughness, failing to meet the technical requirements. The impact energy test result of Comparative Example 1 was 10-15J, which is lower than the technical requirement of >20J for the impact energy of the steel roll. Therefore, the impact energy of Comparative Example 1 did not meet the performance technical requirements for the steel roll, and no subsequent strength test was conducted.

[0119] In Comparative Example 2, the S4 air cooling step temperature was too low, which resulted in the formation of bainite or partial martensite with high hardness but poor toughness, with a hardness of 54-56 HSD. This hardness value was too high and did not meet the technical requirements for steel rolls: hardness of 40-50 HSD. Therefore, no further performance testing was conducted.

[0120] The isothermal temperature and holding time of the S5 isothermal annealing step in Comparative Example 3 were too high, resulting in a coarse-spaced pearlite structure that reduced hardness and strength, and did not meet the performance technical requirements of the steel roll. Therefore, impact performance testing was not carried out thereafter.

[0121] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of performance heat treatment of a shape steel roll, characterized in that, It comprises the following steps: S1: preheating step; S2: first temperature rising and holding step; S3: second temperature rising and holding step; S4: air cooling step; S5: isothermal annealing step; S6: first slow cooling step; S7: second slow cooling step.

2. The method of performing a thermal treatment of a steel strip as claimed in claim 1, characterized in that, In the S1 preheating step, the temperature is raised to 250-300℃ in a heat treatment furnace, and the holding time is 1-10h.

3. The method of performing a thermal treatment of a steel roll according to claim 1, wherein, In the S2 first temperature rising and holding step, the temperature is raised to 600-670℃ at a speed not greater than 60℃ / h, and the holding time is 2-12h.

4. The method of performing a thermal treatment of a steel strip as claimed in claim 1, wherein, In the S3 second temperature rising and holding step, the temperature is raised to 820-880℃ at a speed not greater than 70℃ / h, and the holding time is 8-34h.

5. The method of performing a thermal treatment of a steel roll according to claim 1, wherein, In the S4 air cooling step, the surface temperature of each diameter of the roll is ensured to be 550-650℃.

6. The method of performing a thermal treatment of a steel strip as claimed in claim 1, wherein, In the S5 isothermal annealing step, the temperature is held in a heat treatment furnace at 590-630℃ for 30-80h.

7. The method of performing a thermal treatment of a steel roll according to claim 6, characterized in that, In the S5 isothermal annealing step, the surface and a certain depth of each diameter of the roll are ensured to be controlled at 570-650℃.

8. The method of performing a thermal treatment of a steel roll according to claim 1, wherein, In the S6 first slow cooling step, the temperature is lowered to 390-410℃ at a speed not greater than 30℃ / h.

9. The method of performing a thermal treatment of a steel roll according to claim 1, wherein, In the S7 second slow cooling step, the temperature is lowered to 190-210℃ at a speed not greater than 20℃ / h.

10. A profiled steel roll characterized in that, The roll body and roll neck of the profiled steel roll prepared by the preparation method of any one of claims 1-9 have a microstructure of lamellar pearlite.

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