CN114262843A - Cold-rolled working roll made of BGMC5 steel and heat treatment method thereof - Google Patents
Cold-rolled working roll made of BGMC5 steel and heat treatment method thereof Download PDFInfo
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Abstract
The invention discloses a cold-rolled working roll made of BGMC5 steel and a heat treatment method thereof, relates to the technical field of metallurgical manufacturing, and particularly relates to a BGMC5 steel component for manufacturing the cold-rolled working roll and a heat treatment method of the working roll. The BGMC5 steel of the cold-rolled working roll manufactured by the invention comprises the following components in percentage by mass: c: 0.82-0.90%; si: 0.50-0.80%; mn: 0.20-0.50%, P: less than or equal to 0.020%; s: less than or equal to 0.010 percent; cr: 4.80-5.20%; mo: 0.20-0.40%; v: 0.10-0.20%; cu: less than or equal to 0.25 percent; ni: 0.30-0.50%; the balance being iron and unavoidable impurities. The heat treatment method comprises the following steps: quenching and tempering heat treatment of the roller body, semi-finishing, surface double-frequency quenching treatment, cryogenic treatment and low-temperature tempering; the technical scheme of the invention solves the problems that the prior cold rolling working roll in the prior art can form failure modes such as fracture, stripping, abrasion and the like in a working state, so that the service life of the roll is shortened, the production quality is reduced, the economic benefit is reduced and the like.
Description
Technical Field
The invention discloses a cold-rolled working roll made of BGMC5 steel and a heat treatment method thereof, relates to the technical field of metallurgical manufacturing, and particularly relates to a BGMC5 steel component for manufacturing the cold-rolled working roll and a heat treatment method of the working roll.
Background
At present, the demand of 160 cold rolling lines in China is large every year, and the cold rolling working roll has extremely high requirements under the working state: the surface of the roller blank has certain anti-stripping and thermal shock resistance; the hardening layer is ensured to a certain depth; good hardness and uniformity of hardness. The heat treatment process of the cold roll is therefore of crucial importance for the properties of the end product.
Cold rolls are important consumable parts in cold rolling production. According to statistics, the consumption of the cold rolling working roll in the cold rolling process accounts for about 25 percent of the production cost. The cold roll can lose effectiveness in the using process, the typical failure modes at present are fracture, peeling, abrasion and the like, any failure mode can shorten the service life of the roll and influence the production and economic benefits, and the failures are closely related to the heat treatment process of the cold roll. Therefore, the cold roll can be ensured to have a reasonable heat treatment process.
In view of the problems in the prior art, it is necessary to develop a new cold-rolled work roll made of BGMC5 steel and a heat treatment method thereof, so as to overcome the problems in the prior art.
Disclosure of Invention
According to the technical problems that the existing cold rolling working roll proposed by the prior art can form failure modes such as fracture, stripping, abrasion and the like in a working state, the service life of the roll is shortened, the production quality is reduced, the economic benefit is reduced and the like, the cold rolling working roll manufactured by adopting BGMC5 steel and the heat treatment method thereof are provided. The invention mainly utilizes a brand new process to produce the cold roll, thereby ensuring that the surface of the roll has certain anti-stripping and thermal shock resistance; but also ensures the depth of the roller hardening layer and good hardness and hardness uniformity, and leads the roller to have longer service life.
The technical means adopted by the invention are as follows:
a cold-rolled working roll made of BGMC5 steel comprises the following components in percentage by mass:
C：0.82～0.90％；
Si：0.50～0.80％；
Mn：0.20～0.50％、P：≤0.020％；
S：≤0.010％；
Cr：4.80～5.20％；
Mo：0.20～0.40％；
V：0.10～0.20％；
Cu：≤0.25％；
Ni：0.30～0.50％；
the balance being iron and unavoidable impurities.
The heat treatment method of the cold-rolled working roll made of BGMC5 steel comprises the following steps: quenching and tempering heat treatment of the roller body, semi-finishing, surface double-frequency quenching treatment, cryogenic treatment and low-temperature tempering;
further, the roll body quenching and tempering heat treatment comprises two steps of quenching and tempering; the quenching step adopts a spray quenching process; in the tempering step, high-temperature tempering is immediately carried out after spray quenching is finished;
further, a spray quenching process in the roll body quenching and tempering heat treatment step adopts a vehicle bottom type heating furnace, a cold roll is heated to 865 +/-5 ℃, then spray quenching is carried out by spray quenching equipment, two rows of nozzles are respectively opened at two sides of the roll body part of the roll during spray quenching for cooling, a lower row of nozzles are closed at two sides of the roll neck part of the roll, and an upper row of nozzles are opened for cooling; the revolution of the carrier roller is 10r/min, and the air pressure is 0.7 Mpa; the spray quenching is divided into two stages: in the first stage, nozzles in the four areas are all opened, the spray quenching water flow is 150m3/h, the water pressure is 0.5Mpa, the spray quenching time is 10min, and the water baffle is closed in the sixth minute; the water flow rate of spray quenching in the second stage is 100m3/h, the water pressure is 0.3Mpa, and the spray quenching time is 5 min; and (4) after water supply is cut off, measuring the surface temperature of the roller body, and finishing spray quenching when the temperature is below 300 ℃.
Further, the high-temperature tempering is that the temperature is firstly preserved for 5 hours at 400 ℃, then the temperature is raised to 610 ℃ within 4.5 hours and preserved for 24 hours, and the furnace is cooled to below 250 ℃ and taken out.
Further, semi-finishing is that after the roller after tempering is cooled to room temperature, semi-finishing turning is immediately carried out according to the size requirement of the semi-finishing;
further, the double-splicing surface quenching of the roller body is to preheat a cold roller, preserve heat at 350 ℃ for more than 5 hours, discharge the cold roller, hoist the cold roller on a double-frequency quenching machine tool, and ensure that the rotating speed of the machine tool is 20r/min and the descending speed is 0.7 mm/s; after quenching, the subsequent cooling time is more than 80 min;
further, a roller body double-splicing surface quenching step, wherein the models of selected quenching inductors are 440mm at power frequency, 450mm at intermediate frequency and 450mm at water spraying sleeve; the distance between the inductors is 90-100 mm, and the distance between the inductors and the water jacket is 40 mm; the water pressure is based on that water is sprayed on the surface of the roller without water reflection,
further, the roller body double-splicing surface quenching step comprises that the heating temperature of a first induction power supply is 935-945 ℃ and the heating temperature of a second induction power supply is 945-955 ℃ during quenching.
Further, the cryogenic treatment is double-frequency quenching, the cold roll is integrally placed in a cryogenic box, and the cryogenic treatment is carried out for 72 hours in the environment of minus 80 ℃, so that the complete martensite transformation is ensured, and the strength and the hardness of the roll body are ensured;
further, low-temperature tempering is to heat the roller to 155 ℃ and then preserve heat for 94 hours, and then take out of the furnace and cool the roller in the air.
Compared with the prior art, the invention has the following advantages:
1. according to the cold-rolled working roll manufactured by adopting BGMC5 steel and the heat treatment method thereof, the whole set of heat treatment method is adopted to ensure that the surface of the roll has certain anti-stripping and thermal shock resistance;
2. according to the cold-rolled working roll manufactured by adopting BGMC5 steel and the heat treatment method thereof, the depth of a quenching layer of the roll and good hardness and hardness uniformity are ensured by the whole set of heat treatment method, so that the roll has longer service life;
3. according to the cold rolling working roll manufactured by adopting BGMC5 steel and the heat treatment method thereof, the hardness of the roll body of the product can reach 92-94HSD, the hardness of the roll neck can reach 40-45HSD and the depth of a hardening layer reaches more than 27mm by the whole set of heat treatment method.
In conclusion, the technical scheme of the invention solves the problems that the prior cold rolling working roll in the prior art can form failure modes such as fracture, stripping, abrasion and the like in a working state, so that the service life of the roll is shortened, the production quality is reduced, the economic benefit is reduced and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a quenching and tempering heating process curve of the present invention;
FIG. 2 is a graph of a modulated tempering heating process of the present invention;
FIG. 3 is a graph of the low temperature tempering heating process of the present invention;
FIG. 4 is a metallographic structure of a roll body 100x according to the invention;
FIG. 5 is a 400x metallographic structure of a roll neck according to the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in the figure, the invention provides a cold-rolled working roll made of BGMC5 steel, and the BGMC5 steel of the cold-rolled working roll comprises the following components in percentage by mass:
C：0.82～0.90％；
Si：0.50～0.80％；
Mn：0.20～0.50％、P：≤0.020％；
S：≤0.010％；
Cr：4.80～5.20％；
Mo：0.20～0.40％；
V：0.10～0.20％；
Cu：≤0.25％；
Ni：0.30～0.50％；
the balance being iron and unavoidable impurities.
The heat treatment method of the cold-rolled working roll made of BGMC5 steel comprises the following steps:
1. roll body quenching and tempering:
the quenching treatment adopts a spray quenching process, a cold roll is heated to 865 ℃ by a vehicle bottom type heating furnace according to a heating curve shown in figure 1, then spray quenching is carried out by spray quenching equipment, two rows of nozzles are respectively opened at two sides of the roll body part of the roll for cooling during spray quenching, the lower row of nozzles are closed at two sides of the roll neck part of the roll, and the upper row of nozzles are opened for cooling; the revolution of the carrier roller is 10r/min, and the air pressure is 0.7 Mpa; the spray quenching is divided into two stages: in the first stage, nozzles in the four areas are all opened, the spray quenching water flow is 149m3/h, the water pressure is 0.48Mpa, the spray quenching time is 10min, and the water baffle is closed in the sixth minute; the water flow rate of spray quenching in the second stage is 98m3/h, the water pressure is 0.3Mpa, and the spray quenching time is 5 min; and (4) after water supply is cut off, measuring the surface temperature of the roller body, and finishing spray quenching when the temperature is 298 ℃.
And (3) immediately carrying out high-temperature tempering after the spray quenching is finished, wherein the tempering process comprises the steps of preserving heat for 5 hours at 395 ℃, then heating to 609 ℃ within 4.5 hours, preserving heat for 24 hours, cooling the furnace to 245 ℃, and discharging.
2. Semi-finishing:
and cooling the tempered roller to room temperature, and then immediately performing semi-finish turning according to the semi-finish size requirement.
3. Double-frequency surface quenching of the roller body:
the double-frequency quenching process comprises the steps of preheating a cold roll, keeping the temperature at 348 ℃ for 6 hours, discharging, hoisting the cold roll to a double-frequency quenching machine tool, wherein the rotating speed of the machine tool is 20r/min, and the descending speed is 0.7 mm/s. The quenching inductor has the model of power frequency phi 440mm, intermediate frequency phi 450mm and water spraying sleeve phi 450 mm; the distance between the inductor and the water jacket is 95mm, and the distance between the inductor and the water jacket is 40 mm; the water pressure is based on that water is sprayed on the roller surface without water reflection, and the subsequent cooling time is 90min after quenching is finished. The heating temperature of the first induction power supply is 940 ℃ and the heating temperature of the second induction power supply is 950 ℃ during quenching.
4. Cryogenic treatment:
after double-frequency quenching, the cold roll is integrally placed in a cryogenic box and subjected to cryogenic treatment for 72 hours in an environment of-80 ℃, so that the martensite transformation is completely ensured, and the strength and the hardness of the roll body are ensured.
5. Low-temperature tempering:
heating the roller to 155 ℃, preserving heat for 94 hours, discharging and air cooling.
The cold rolling working roll prepared from the components has the following properties after being subjected to heat treatment in the process steps:
table 1 shows that the surface hardness of the roller body is measured by taking four generatrices at equal intervals.
Table 2 shows the equidistant hardness test of the four busbars at the roll neck.
According to the hardness detection results of the roll body and the roll neck, the lowest hardness of the roll body is 92.1HSD, the maximum hardness of the roll body is 94, and the requirements of the standard 92-94HSD are met; the hardness of the roll neck is 40.8-44.3 HSD, and meets the requirement of 40-45HSD standard.
As can be seen from the figures 4 and 5, the metallographic structure of the roller body is a cryptoacicular martensite structure and a residual austenite structure, the structures are uniformly distributed, and the metallographic structure corresponds to the measured hardness data and has better hardness and wear resistance. The roll neck metallographic structure is a tempered sorbite structure which is in dispersion distribution, and carbide particles are moderate in size, uniform in distribution and good in mechanical property.
TABLE 1 four bus lines on the roller body (HSD)
| A | 92.1 | 93.2 | 93 | 93.5 | 93.8 |
| B | 93.2 | 94 | 92.2 | 92.6 | 93.1 |
| C | 93.1 | 93.2 | 93.0 | 93.8 | 92.2 |
| D | 92.5 | 93.6 | 92.8 | 93.1 | 92.7 |
TABLE 2 four bus bars at roll neck (HSD)
| A | 42.2 | 42.4 | 41.4 | 40.8 | 42.2 |
| B | 42.3 | 42.0 | 43.1 | 42.4 | 41.5 |
| C | 43.4 | 42.9 | 42.1 | 43.0 | 44.3 |
| D | 42.4 | 43.5 | 42.1 | 43.2 | 42.3 |
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A cold-rolled working roll made of BGMC5 steel, characterized in that:
the BGMC5 steel of the manufactured cold-rolled working roll comprises the following components in percentage by mass:
C：0.82～0.90％；
Si：0.50～0.80％；
Mn：0.20～0.50％、P：≤0.020％；
S：≤0.010％；
Cr：4.80～5.20％；
Mo：0.20～0.40％；
V：0.10～0.20％；
Cu：≤0.25％；
Ni：0.30～0.50％；
the balance being iron and unavoidable impurities.
2. A heat treatment method of a cold-rolled working roll made of BGMC5 steel is characterized in that:
the heat treatment method comprises the following steps: quenching and tempering heat treatment of the roller body, semi-finishing, surface double-frequency quenching treatment, cryogenic treatment and low-temperature tempering;
the roll body quenching and tempering heat treatment comprises two steps of quenching and tempering; the quenching step adopts a spray quenching process; in the tempering step, high-temperature tempering is immediately carried out after spray quenching is finished;
the semi-finish machining is that after the tempered roller is cooled to room temperature, semi-finish machining is immediately carried out according to the size requirement of the semi-finish machining;
the double-spliced surface quenching of the roller body comprises the steps of preheating a cold roller, keeping the temperature at 350 ℃ for more than 5 hours, discharging, hoisting the cold roller to a double-frequency quenching machine tool, wherein the rotating speed of the machine tool is 20r/min, and the descending speed is 0.7 mm/s; after quenching, the subsequent cooling time is more than 80 min;
the cryogenic treatment is that after double-frequency quenching, the cold roll is integrally placed in a cryogenic box and is subjected to cryogenic treatment for 72 hours in an environment of-80 ℃, so that complete martensite transformation is ensured, and the strength and the hardness of the roll body are ensured;
and the low-temperature tempering is to heat the roller to 155 ℃, then preserve heat for 94 hours, and take out of the furnace for air cooling.
3. The heat treatment method of cold-rolled work rolls made of BGMC5 steel according to claim 2, characterized in that:
the spray quenching process in the roll body quenching and tempering heat treatment step adopts a vehicle bottom type heating furnace, a cold roll is heated to 865 +/-5 ℃, then spray quenching is carried out by spray quenching equipment, two rows of nozzles are respectively opened at two sides of the roll body part of the roll during spray quenching, a lower row of nozzles are closed at two sides of the roll neck part of the roll, and an upper row of nozzles are opened for cooling; the revolution of the carrier roller is 10r/min, and the air pressure is 0.7 Mpa; the spray quenching is divided into two stages: in the first stage, nozzles in the four areas are all opened, the spray quenching water flow is 150m3/h, the water pressure is 0.5Mpa, the spray quenching time is 10min, and the water baffle is closed in the sixth minute; the water flow rate of spray quenching in the second stage is 100m3/h, the water pressure is 0.3Mpa, and the spray quenching time is 5 min; and (4) after water supply is cut off, measuring the surface temperature of the roller body, and finishing spray quenching when the temperature is below 300 ℃.
4. The heat treatment method of cold-rolled work rolls made of BGMC5 steel according to claim 2, characterized in that:
the high-temperature tempering is that the temperature is preserved for 5 hours at 400 ℃, then the temperature is raised to 610 ℃ within 4.5 hours and preserved for 24 hours, and the furnace is cooled to below 250 ℃ and taken out of the furnace.
5. The heat treatment method of cold-rolled work rolls made of BGMC5 steel according to claim 2, characterized in that:
in the step of double-splicing surface quenching of the roller body, the models of quenching inductors are 440mm at power frequency, 450mm at intermediate frequency and 450mm at water spraying sleeve; the distance between the inductors is 90-100 mm, and the distance between the inductors and the water jacket is 40 mm; the water pressure is based on that water is sprayed on the surface of the roller without water reflection.
6. The heat treatment method of cold-rolled work rolls made of BGMC5 steel according to claim 2, characterized in that:
and the step of double-splicing surface quenching of the roller body comprises that the heating temperature of a first induction power supply is 935-945 ℃ and the heating temperature of a second induction power supply is 945-955 ℃ during quenching.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013151708A (en) * | 2010-12-27 | 2013-08-08 | Nippon Steel & Sumitomo Metal Corp | Method for manufacturing hot stamped body having small variation in hardness, and the hot stamped body |
| CN104195450A (en) * | 2014-08-21 | 2014-12-10 | 宜兴市永昌轧辊有限公司 | Heat treatment method of cold-rolled working roll with high wear resistance and roll mark resistance |
| CN105063502A (en) * | 2015-07-25 | 2015-11-18 | 宜兴市永昌轧辊有限公司 | Improved cold roller and preparation method thereof |
| CN205774666U (en) * | 2016-05-31 | 2016-12-07 | 本钢板材股份有限公司 | A kind of continuous annealing unit of cold-rolled products |
| US20210054476A1 (en) * | 2018-01-05 | 2021-02-25 | The University Of Hong Kong | Automotive steel and a method for the fabrication of the same |
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2021
- 2021-12-03 CN CN202111466860.0A patent/CN114262843B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013151708A (en) * | 2010-12-27 | 2013-08-08 | Nippon Steel & Sumitomo Metal Corp | Method for manufacturing hot stamped body having small variation in hardness, and the hot stamped body |
| CN104195450A (en) * | 2014-08-21 | 2014-12-10 | 宜兴市永昌轧辊有限公司 | Heat treatment method of cold-rolled working roll with high wear resistance and roll mark resistance |
| CN105063502A (en) * | 2015-07-25 | 2015-11-18 | 宜兴市永昌轧辊有限公司 | Improved cold roller and preparation method thereof |
| CN205774666U (en) * | 2016-05-31 | 2016-12-07 | 本钢板材股份有限公司 | A kind of continuous annealing unit of cold-rolled products |
| US20210054476A1 (en) * | 2018-01-05 | 2021-02-25 | The University Of Hong Kong | Automotive steel and a method for the fabrication of the same |
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