CN115261596A - Heat treatment method of alloy steel strip - Google Patents
Heat treatment method of alloy steel strip Download PDFInfo
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- CN115261596A CN115261596A CN202211039424.XA CN202211039424A CN115261596A CN 115261596 A CN115261596 A CN 115261596A CN 202211039424 A CN202211039424 A CN 202211039424A CN 115261596 A CN115261596 A CN 115261596A
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D1/26—Methods of annealing
-
- 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
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5735—Details
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/63—Continuous furnaces for strip or wire the strip being supported by a cushion of gas
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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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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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to the technical field of steel strip heat treatment, in particular to a heat treatment method of an alloy steel strip, which comprises an uncoiler, a transmission roller, a heating furnace, a cooling furnace and a coiling machine; the heating furnace is provided with a heating mechanism; the heating mechanism replaces a transmission roller with hot air while heating the alloy steel strip, and an air curtain is formed below the alloy steel strip to support the alloy steel strip; the heating mechanism comprises a high-temperature hot air blower, an air dissipation plate and an air dissipation channel; according to the invention, when the ultrathin alloy steel strip enters the heating furnace and is subjected to heat treatment, high-temperature hot air is used for replacing a transmission roller to support the ultrathin alloy steel strip, so that the ultrathin alloy steel strip is heated while being supported by the high-temperature hot air, and the defects of scratches, roll marks and the like formed on the surface of the ultrathin alloy strip can be avoided; meanwhile, inert gas is used as high-temperature hot air, so that the ultrathin alloy steel strip is heated while the ultrathin alloy steel strip is prevented from being oxidized.
Description
Technical Field
The invention relates to the technical field of steel strip heat treatment, in particular to a heat treatment method of an alloy steel strip.
Background
The alloy steel strip needs to be subjected to heat treatment of quenching and tempering before use; in the prior art, when the alloy steel strip is subjected to heat treatment, firstly, an alloy steel strip coil is unfolded, so that the alloy steel strip enters a heating furnace, is heated by the heating furnace and then is cooled, and thus quenching is completed;
in the heating furnace in the prior art, an alloy steel strip is heated by using induced current, namely an induction coil is arranged above or below the alloy steel strip, when alternating current passes through the induction coil, a changing magnetic field is generated in the induction coil, and when the alloy steel strip passes through the changing magnetic field, eddy current is generated in the alloy steel strip, so that the alloy steel strip is heated to a quenching temperature;
after the induction current is used for heating the ultrathin alloy strip, in the process that the ultrathin alloy strip moves in the heating furnace, the ultrathin alloy strip is contacted and pressed with a transmission roller in the furnace under the action of self gravity, the defects of scratches, roll marks and the like can be formed on the surface of the ultrathin alloy strip, and the quality of the ultrathin alloy steel strip is reduced.
To this end, we propose a heat treatment method of an alloy steel strip.
Disclosure of Invention
In order to make up the defects of the prior art, the invention provides the heat treatment method of the alloy steel strip, the ultra-thin alloy steel strip is placed into the heating furnace and is supported by high-temperature hot air instead of a transmission roller during heat treatment, so that the ultra-thin alloy steel strip is heated while being supported by the high-temperature hot air, and the defects of scratches, roll marks and the like formed on the surface of the ultra-thin alloy strip cannot occur; meanwhile, inert gas is used as high-temperature hot air, so that the ultrathin alloy steel strip is heated while the ultrathin alloy steel strip is prevented from being oxidized.
In order to achieve the purpose, the invention provides the following technical scheme:
a heat treatment method of an alloy steel strip comprises
The device comprises an uncoiler, a transmission roller, a heating furnace, a cooling furnace and a coiling machine;
the heating furnace is provided with a heating mechanism; the heating mechanism replaces a transmission roller with hot air while heating the alloy steel strip, and an air curtain is formed below the alloy steel strip to support the alloy steel strip.
Preferably, the heating mechanism comprises a high-temperature hot air blower, an air-diffusing plate and an air-diffusing channel; the high-temperature hot air blower is arranged beside the heating furnace; the air diffuser plate is fixedly connected in the heating furnace and is positioned below the alloy steel strip; the air diffusing channel is arranged on the air diffusing plate and uniformly penetrates through the upper surface of the air diffusing plate; the side surface of the air diffuser plate is fixedly connected with a connecting pipe; one end of the connecting pipe is communicated with the air dissipation channel, and the other end of the connecting pipe is fixedly connected and communicated with the output end of the high-temperature air heater.
Preferably, the gas input at the input end of the high-temperature hot air blower is an inert gas, such as nitrogen.
Preferably, the channel opening of the air dispersing channel is obliquely arranged towards the moving direction of the alloy steel strip; the top of the heating furnace an air outlet is arranged.
When the ultra-thin alloy steel strip needs to be quenched or subjected to heat treatment such as meeting or waiting, a worker firstly starts the high-temperature air heater through the controller, so that high-temperature air blown out by the high-temperature air heater enters the connecting pipe through the output end, then enters the heat dissipation channel in the air dissipation plate through the connecting pipe, and is uniformly blown out from the port of the heat dissipation channel to form an air curtain; the working personnel convey the ultrathin alloy steel strip to an uncoiler to uncoil, then the uncoiled ultrathin alloy steel strip enters a heating furnace through the transmission of a transmission roller, so that the ultrathin alloy steel strip is positioned above an air curtain formed by high-temperature gas, the ultrathin alloy steel strip is supported by the air curtain formed by the high-temperature gas at the moment, and when the high-temperature gas is contacted with the ultrathin alloy steel strip, the ultrathin alloy steel strip is heated to reach the temperature of heat treatment (heated to 800 ℃ -830 ℃ during quenching and heated to 500 ℃ -650 ℃ during annealing), the ultrathin alloy steel strip slowly moves forwards in the heating furnace under the support of the high-temperature gas, so that the ultrathin alloy steel strip is completely converted into an austenite structure in the heating furnace, then the ultrathin alloy steel strip enters a cooling furnace, the ultrathin alloy steel strip is rapidly cooled to 30 ℃ -50 ℃ in the cooling furnace, the austenite structure is converted into martensite, the alloy steel of the ultrathin alloy steel strip is quenched, the cooled ultrathin alloy steel strip is transmitted to the uncoiler through the transmission roller again, and the ultrathin alloy steel strip is coiled by a coiling machine;
introducing inert gases such as nitrogen and the like into an input end of a high-temperature hot air blower, so that when the ultrathin alloy steel strip is heated, the inert gases such as nitrogen and the like serve as a heating medium and a protective medium, so that when the ultrathin alloy steel strip is heated, the inert gases such as nitrogen and the like surround the ultrathin alloy steel strip, air is prevented from contacting with the ultrathin alloy steel strip, and the ultrathin alloy steel strip is prevented from being oxidized by air after being heated;
the passage opening of the air diffusing passage is obliquely arranged, so that the wind direction of blown high-temperature hot wind is oblique, and after the high-temperature hot wind is contacted with the ultrathin alloy steel strip, the acting force of the high-temperature hot wind on the ultrathin alloy steel strip is oblique, so that the high-temperature hot wind pushes the ultrathin alloy steel strip to move forwards while supporting the ultrathin alloy steel strip; the high-temperature hot air flows out of an air outlet on the heating furnace after supporting the ultrathin alloy steel strip;
according to the invention, when the ultrathin alloy steel strip enters the heating furnace and is subjected to heat treatment, high-temperature hot air is used for replacing a transmission roller to support the ultrathin alloy steel strip, so that the ultrathin alloy steel strip is heated while being supported by the high-temperature hot air, and the defects of scratches, roll marks and the like formed on the surface of the ultrathin alloy strip can be avoided; meanwhile, inert gas is used as high-temperature hot air, so that the ultrathin alloy steel strip is heated while the ultrathin alloy steel strip is prevented from being oxidized.
Preferably, the connecting pipe is a three-way pipe, and two ends of the connecting pipe are fixedly connected with the front end and the rear end of the air diffuser plate.
Preferably, a dispersing piece is fixedly connected in a channel opening of the air dispersing channel; the dispersion piece comprises a circular ring and a transverse plate which is inclined towards the outside in the circular ring, and the dispersion piece uniformly disperses high-temperature gas blown out from a channel opening of the air dispersing channel.
When high-temperature hot air is blown out from the output end of the high-temperature air heater, the high-temperature hot air is transmitted to the front end and the rear end of the air diffusing plate through the tee-joint connecting pipe, so that the air volume of the high-temperature hot air blown out from the air diffusing channel of the air diffusing plate tends to be consistent, the condition that the air volume of one side far away from the high-temperature hot air inlet part is gradually reduced along with the blowing of the high-temperature hot air after the high-temperature hot air is blown out uniformly is avoided, meanwhile, the dispersing part is arranged at the channel opening of the air diffusing channel, so that the high-temperature hot air is guided by the inclined transverse plate of the dispersing part and is diffused around the lower direction of the ultrathin alloy steel strip when passing through the dispersing part, the condition that the wind power of the part of the ultrathin alloy steel strip close to the channel opening of the air diffusing channel is large, the wind power of other parts is small, the bending deformation of the ultrathin alloy steel strip and the non-uniform heating are avoided, and the implementation effect of the invention is ensured.
Preferably, two groups of rotating plates are rotatably connected to the side walls on the two sides in the heating furnace.
The rotor plate downward sloping sets up when initial condition to blow off the back at high-temperature hot-blast process dispersion piece, upwards blow the rotor plate, make the rotor plate upwards rotate, the rotor plate level sets up this moment, and be in the both sides of ultra-thin alloy steel strip below, thereby make originally the high-temperature hot-blast that blows through from ultra-thin alloy steel strip both sides change the direction after contacting with the rotor plate, be close to towards the direction that is close to ultra-thin alloy steel strip on horizontal, make high-temperature hot-blast utilization ratio obtain improving, and the production cost is reduced.
A heat treatment method of an alloy steel strip comprises the following steps:
s1: uncoiling: the method comprises the following steps that a worker puts an alloy steel strip coil on an uncoiling machine, presses a starting button of an uncoiling machine, so that the uncoiling machine drives the alloy steel strip coil to rotate, the alloy steel strip coil is uncoiled, and the uncoiled alloy steel strip is transmitted through a transmission roller and enters a heating furnace;
s2: heating: high-temperature hot air is blown out of the bottom of the heating furnace, the high-temperature hot air forms an air curtain below the ultrathin alloy steel strip, the bottom of the ultrathin alloy steel strip is supported, a transmission roller is not needed for supporting the ultrathin alloy steel strip, the defects of scratches, roll marks and the like on the surface of the ultrathin alloy steel strip cannot occur, and meanwhile, the ultrathin alloy steel strip is heated after the high-temperature hot air is contacted with the ultrathin alloy steel strip, so that the temperature of the ultrathin alloy steel strip reaches 800-830 ℃;
s3: and (3) cooling: the heated ultrathin alloy rigid belt enters a cooling furnace, and the ultrathin alloy rigid belt is cooled to 30-50 ℃ in the cooling furnace;
s4: rolling: and the cooled ultrathin alloy rigid belt is transmitted to a winding device through a transmission roller, and is automatically bundled after being wound by the winding device, so that the ultrathin alloy rigid belt is wound, and a worker takes the wound ultrathin alloy rigid belt coil off the winding device.
The invention has the beneficial effects that:
1. according to the invention, when the ultrathin alloy steel strip enters the heating furnace and is subjected to heat treatment, high-temperature hot air is used for replacing a transmission roller to support the ultrathin alloy steel strip, so that the ultrathin alloy steel strip is heated while being supported by the high-temperature hot air, and the defects of scratches, roll marks and the like formed on the surface of the ultrathin alloy strip can be avoided; meanwhile, inert gas is used as high-temperature hot air, so that the ultrathin alloy steel strip is heated while the ultrathin alloy steel strip is prevented from being oxidized.
2. According to the invention, when high-temperature hot air passes through the dispersing piece, the high-temperature hot air is guided by the transverse plates inclined on the dispersing piece and is diffused around the lower part of the ultrathin alloy steel strip, so that the hot air blown out from the air dispersing channel is more uniform, the situations that the wind force on the part of the ultrathin alloy steel strip close to the channel opening of the air dispersing channel is large, and the wind force on other parts is small, so that the ultrathin alloy steel strip is bent and deformed and is heated unevenly are avoided, and the implementation effect of the invention is ensured.
3. According to the invention, after high-temperature hot air is blown out from the dispersion piece, the rotating plate is blown upwards, so that the rotating plate rotates upwards, and the rotating plate is horizontally arranged and positioned at two sides below the ultrathin alloy steel strip, so that the high-temperature hot air blown from two sides of the ultrathin alloy steel strip is changed in direction after contacting with the rotating plate and is close to the ultrathin alloy steel strip in the transverse direction, the utilization rate of the high-temperature hot air is improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a partial sectional view of a heating furnace according to the present invention;
FIG. 3 isbase:Sub>A partial sectional view of the furnace of FIG. 2 taken at view A-A;
FIG. 4 is a partial sectional view between the rotary plate and the heating furnace as viewed from B-B in FIG. 3;
fig. 5 is a schematic view showing the positional relationship between the dispersing plate and the dispersing passage and the dispersing member in the present invention;
FIG. 6 is an enlarged view at C of FIG. 5;
fig. 7 is a schematic structural view of a dispersion member of the present invention.
In the figure: 1. an uncoiler; 2. a transfer roller; 3. heating furnace; 31. a heating mechanism; 32. a high temperature air heater; 33. a diffuser plate; 34. a wind-dispersing channel; 4. cooling the furnace; 5. a winding machine; 6. a rotating plate; 61. an air outlet; 7. a connecting pipe; 8. a dispersion member.
Detailed Description
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. 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.
A heat treatment method of an alloy steel strip comprises
An uncoiler 1;
a transfer roller 2;
a heating furnace 3;
a cooling furnace 4;
a winding machine 5; the heating furnace 3 is provided with a heating mechanism 31; the heating mechanism 31 heats the alloy steel strip and replaces the conveying roller 2 with hot air, so that an air curtain is formed below the alloy steel strip to support the alloy steel strip.
In this embodiment, the heating mechanism 31 includes a high temperature hot air blower 32, an air diffuser plate 33 and an air diffuser channel 34; the high-temperature hot air blower 32 is arranged beside the heating furnace 3; the air diffuser plate 33 is fixedly connected in the heating furnace 3, and the air diffuser plate 33 is positioned below the alloy steel strip; the air dispersing channel 34 is arranged on the air dispersing plate 33, and the air dispersing channel 34 uniformly penetrates through the upper surface of the air dispersing plate 33; the side surface of the air diffuser plate 33 is fixedly connected with a connecting pipe 7; one end of the connecting pipe 7 is communicated with the air-dispersing channel 34, and the other end is fixedly connected and communicated with the output end of the high-temperature air heater 32.
In this embodiment, the gas input from the input end of the high temperature hot air blower 32 is an inert gas, such as nitrogen.
In this embodiment, the channel opening of the air dispersing channel 34 is arranged obliquely toward the moving direction of the alloy steel strip; an air outlet 61 is formed in the top of the heating furnace 3.
When the ultra-thin alloy steel strip needs to be subjected to heat treatment such as quenching or tempering, a worker firstly starts the high-temperature air heater 32 through the controller, so that high-temperature air blown out by the high-temperature air heater 32 enters the connecting pipe 7 through the output end, then enters the heat dissipation channel in the air dissipation plate 33 through the connecting pipe 7, and is uniformly blown out from the port of the heat dissipation channel to form an air curtain; the working personnel convey the ultrathin alloy steel strip to the uncoiler 1 to uncoil the ultrathin alloy steel strip, then the uncoiled ultrathin alloy steel strip is conveyed by the conveying roller 2 to enter the heating furnace 3, so that the ultrathin alloy steel strip is positioned above an air curtain formed by high-temperature gas, the ultrathin alloy steel strip is supported by the air curtain formed by the high-temperature gas at the moment, and meanwhile, when the high-temperature gas is contacted with the ultrathin alloy steel strip, the ultrathin alloy steel strip is heated to reach the heat treatment temperature (the temperature is 800-830 ℃ during quenching and is 500-650 ℃ during annealing), the ultrathin alloy steel strip is slowly moved forwards in the heating furnace 3 under the support of the high-temperature gas, so that the ultrathin alloy steel strip is completely transformed into an austenite structure in the heating furnace 3, then the ultrathin alloy steel strip enters the cooling furnace 4, the ultrathin alloy steel strip is rapidly cooled to 30-50 ℃ in the cooling furnace 4, so that the austenite structure is transformed into a martensite, so that the quenching of the ultrathin alloy steel strip is completed, the cooled ultrathin alloy steel strip is conveyed to the coiling machine 5 to the coiling machine through the conveying roller 2 again, so that the ultrathin alloy steel strip is coiled into the coiling machine 5, and then the ultrathin alloy steel strip is transformed into the heat treatment machine;
introducing inert gases such as nitrogen and the like into an input end of the high-temperature hot air blower 32, so that when the ultrathin alloy steel strip is heated, the inert gases such as nitrogen and the like serve as a heating medium and a protective medium, so that when the ultrathin alloy steel strip is heated, the inert gases such as nitrogen and the like surround the ultrathin alloy steel strip, air is prevented from contacting with the ultrathin alloy steel strip, and the ultrathin alloy steel strip is prevented from being oxidized by air after being heated;
the passage opening of the air diffusing passage 34 is obliquely arranged, so that the wind direction of blown high-temperature hot air is oblique, and after the high-temperature hot air is contacted with the ultrathin alloy steel strip, the acting force of the high-temperature hot air on the ultrathin alloy steel strip is oblique, so that the ultrathin alloy steel strip is pushed to move forwards while the ultrathin alloy steel strip is supported; the high-temperature hot air flows out from an air outlet on the heating furnace 3 after supporting the ultrathin alloy steel strip;
according to the invention, when the ultrathin alloy steel strip enters the heating furnace 3 and is subjected to heat treatment, high-temperature hot air is used for replacing the transmission roller 2 to support the ultrathin alloy steel strip, so that the ultrathin alloy steel strip is heated while being supported by the high-temperature hot air, and the defects of scratches, roll marks and the like formed on the surface of the ultrathin alloy strip can be avoided; meanwhile, inert gas is used as high-temperature hot air, so that the ultrathin alloy steel strip is heated while the ultrathin alloy steel strip is prevented from being oxidized.
The second embodiment:
the difference between this embodiment and the first embodiment is that
In this embodiment, the connecting pipe 7 is a three-way pipe, and two ends of the connecting pipe 7 are fixedly connected with the front end and the rear end of the air diffuser plate 33.
In this embodiment, the dispersion member 8 is fixedly connected in the channel opening of the air dispersion channel 34; the dispersion member 8 is composed of a circular ring and a transverse plate which is inclined towards the outside in the circular ring, and the dispersion member 8 uniformly disperses high-temperature gas blown out from the channel opening of the air dispersing channel 34.
When high-temperature hot air is blown out from the output end of the high-temperature hot air blower 32, the high-temperature hot air is transmitted to the front end and the rear end of the air diffuser 33 through the tee-joint connecting pipe 7, so that the air volume of the high-temperature hot air blown out from the air diffuser channel 34 of the air diffuser 33 tends to be consistent, the condition that the air volume of one side far away from the high-temperature hot air inlet part is gradually reduced along with the blowing of the high-temperature hot air after the high-temperature hot air is blown out to cause non-uniformity of the blown high-temperature hot air is avoided, meanwhile, the channel opening of the air diffuser channel 34 is provided with the dispersing piece 8, so that the high-temperature hot air is guided by the transverse plate inclined on the dispersing piece 8 and is diffused around the lower direction of the ultrathin alloy steel strip when passing through the dispersing piece 8, the hot air blown out from the air diffuser channel 34 is more uniform, the condition that the part of the ultrathin alloy steel strip close to the channel opening of the air diffuser channel 34 is subjected to large wind force, and the other parts are subjected to small wind force, thereby causing bending deformation and non-uniform heating of the ultrathin alloy steel strip is avoided, and the implementation effect of the invention is ensured.
Example three:
the difference between the first embodiment and the second embodiment is that
In this embodiment, two sets of rotating plates 6 are rotatably connected to the side walls on the two sides in the heating furnace 3.
Rotate on the lateral wall of both sides in heating furnace 3 and be connected with two sets of rotor plates 6, rotor plates 6 downward sloping setting when initial condition, thereby blow off the back at high-temperature hot-blast process dispersion piece 8, upwards blow rotor plates 6, make rotor plates 6 upwards rotate, rotor plates 6 level setting this moment, and be in the both sides of ultra-thin alloy steel band below, thereby make originally the high-temperature hot-blast direction of changing after contacting with rotor plates 6 that blow from ultra-thin alloy steel area both sides, be close to towards the side that is close to ultra-thin alloy steel band on horizontal, make high-temperature hot-blast utilization ratio obtain improving, and the production cost is reduced.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A heat treatment method of an alloy steel strip comprises
The device comprises an uncoiler (1), a transmission roller (2), a heating furnace (3), a cooling furnace (4) and a coiling machine (5);
the method is characterized in that: the heating furnace (3) is provided with a heating mechanism (31); the heating mechanism (31) replaces the conveying roller (2) with hot air while heating the alloy steel strip, and an air curtain is formed below the alloy steel strip to support the alloy steel strip.
2. A method of heat treating an alloy steel strip according to claim 1, characterized in that: the heating mechanism (31) comprises a high-temperature hot air blower (32), an air diffusing plate (33) and an air diffusing channel (34); the high-temperature hot air blower (32) is arranged beside the heating furnace (3); the air diffuser plate (33) is fixedly connected in the heating furnace (3), and the air diffuser plate (33) is positioned below the alloy steel strip; the air dispersing channel (34) is arranged on the air dispersing plate (33), and the air dispersing channel (34) uniformly penetrates through the upper surface of the air dispersing plate (33); the side surface of the air diffuser plate (33) is fixedly connected with a connecting pipe (7); one end of the connecting pipe (7) is communicated with the air dissipation channel (34), and the other end of the connecting pipe is fixedly connected and communicated with the output end of the high-temperature air heater (32).
3. A method of heat treating an alloy steel strip as claimed in claim 2 wherein: the gas input by the input end of the high-temperature hot air blower (32) is inert gas.
4. A method of heat treating an alloy steel strip as claimed in claim 2 wherein: the channel opening of the air dispersing channel (34) is obliquely arranged towards the moving direction of the alloy steel strip; an air outlet (61) is formed in the top of the heating furnace (3).
5. A method of heat treating an alloy steel strip as claimed in claim 2 wherein: the connecting pipe (7) is a three-way pipe, and two ends of the connecting pipe (7) are fixedly connected with the front end and the rear end of the air diffuser plate (33).
6. A method of heat treating an alloy steel strip as claimed in claim 2, characterized in that: a dispersing piece (8) is fixedly connected in the channel opening of the air dispersing channel (34); the dispersion piece (8) is composed of a circular ring and a transverse plate which is arranged in the circular ring and inclines towards the outside, and the dispersion piece (8) can uniformly disperse high-temperature gas blown out from a channel opening of the air dispersing channel (34).
7. A method of heat treating an alloy steel strip as claimed in claim 2 wherein: and two groups of rotating plates (6) are rotatably connected to the side walls of the two sides in the heating furnace (3).
8. A method of heat treating an alloy steel strip according to claims 1 to 7, characterized in that: the method comprises the following steps:
s1: uncoiling: the method comprises the following steps that a worker puts an alloy steel strip coil on an uncoiler (1), presses a start button of the uncoiler (1), so that the uncoiler (1) drives the alloy steel strip coil to rotate, the alloy steel strip coil is uncoiled, and the uncoiled alloy steel strip is conveyed by a conveying roller (2) and enters a heating furnace (3);
s2: heating: high-temperature hot air is blown out of the bottom of the heating furnace (3), the high-temperature hot air forms an air curtain below the ultrathin alloy steel strip, the bottom of the ultrathin alloy steel strip is supported, so that the ultrathin alloy steel strip is not required to be supported by the transmission roller (2), the defects of scratches, roll marks and the like on the surface of the ultrathin alloy steel strip cannot occur, and meanwhile, the ultrathin alloy steel strip is heated after the high-temperature hot air is contacted with the ultrathin alloy steel strip, so that the temperature of the ultrathin alloy steel strip reaches 800-830 ℃;
s3: and (3) cooling: the heated ultrathin alloy rigid belt enters a cooling furnace (4), and the ultrathin alloy rigid belt is cooled to 30-50 ℃ in the cooling furnace (4);
s4: winding: the cooled ultrathin alloy rigid belt is transmitted to a winding machine (5) through a transmission roller (2), the winding machine (5) winds the ultrathin alloy rigid belt, and workers take the wound ultrathin alloy steel belt coil down from the winding machine (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211039424.XA CN115261596A (en) | 2022-08-29 | 2022-08-29 | Heat treatment method of alloy steel strip |
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| CN202211039424.XA CN115261596A (en) | 2022-08-29 | 2022-08-29 | Heat treatment method of alloy steel strip |
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| RU2213151C1 (en) * | 2002-08-15 | 2003-09-27 | Закрытое акционерное общество "Инструмент" | Method and line for thermal processing of steel strip |
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