CN113957219B - Preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circle - Google Patents
Preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circle Download PDFInfo
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/02—Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/04—Shaping in the rough solely by forging or pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
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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
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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
- C21D1/74—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
- 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
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure 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
- C21D11/00—Process control or regulation for heat treatments
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to the field of iron metallurgy, in particular to a preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circles, which comprises the steps of heating steel ingots to a specified temperature in a vacuum heating furnace; taking out the steel ingot and forging the steel ingot under the protection of nitrogen to obtain a forged circle; cooling the forged circle to a first temperature and then taking out; quenching the forged circle; annealing the forged circle; tempering the forged circle. Therefore, the forging circle can be heated and forged in a protection state, and the forging circle can not be contacted with external air to generate reaction in the processes, so that a cleaning machine is not required to be used for continuously removing ferric oxide on the surface of the red hot forging blank, the working efficiency and the forging quality of the carbon manganese steel S355J2G3 forging circle are improved, and the mass production application can be realized.
Description
Technical Field
The invention relates to the field of iron metallurgy, in particular to a preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circles.
Background
s355j2g3 is low-alloy high-strength carbon manganese steel, and the material is equivalent to Q345D of GB standard.
The existing carbon-manganese steel has complex manufacturing process and reduces the manufacturing efficiency.
Disclosure of Invention
The invention aims to provide a preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circles, which aims to improve the working efficiency and the quality of the carbon manganese steel.
In order to achieve the above object, the present invention provides a method for preparing a low temperature impact resistant carbon manganese steel S355J2G3 forged circle, comprising heating a steel ingot to a specified temperature in a vacuum heating furnace; taking out the steel ingot and forging the steel ingot under the protection of nitrogen to obtain a forged circle; cooling the forged circle to a first temperature and then taking out; quenching the forged circle; annealing the forged circle; tempering the forged circle.
The specific steps of heating the steel ingot to the specified temperature in the vacuum heating furnace are as follows:
putting the steel ingot into a heating furnace with the temperature of 600-660 ℃ and the heat preservation time of 7-11 hours;
heating to 850-880 ℃ at a heating rate of 80-100 ℃/h, preserving heat for 11-13 hours,
heating to 1140-1200 deg.c, maintaining and discharging.
The steel ingot is taken out and forged under the protection of nitrogen, so that a forged circle is obtained, and the specific steps are as follows:
putting the steel ingot into a protection device filled with nitrogen
Forging and pressing the steel ingot into square columns by adopting a forging and pressing head;
and forging the square column into a cylinder again.
The specific steps of taking out the forged round after cooling to the first temperature are as follows:
actively cooling the forged circle obtained after forging by a fan for 30-40 min, and then burying sand;
inserting a heat radiation rod into sand around the forged circle;
the heat dissipation rod is provided with a threaded rod for stirring sand to dissipate heat;
performing air cooling and heat dissipation on sand at the top of the forging;
and (5) sand is produced when the forging circle temperature value is reduced to the first temperature.
The concrete steps of sand production when the forging circle temperature value is reduced to the first temperature are as follows:
detecting the surface temperature of the forging cylinder by inserting a plurality of sensors into sand;
averaging the values of the plurality of sensors to obtain an average temperature value;
and sand is produced when the average temperature value is reduced to the first temperature.
The specific mode for quenching the forged circle is as follows: when the workpiece passing through the first zone does not reach the required temperature, automatically starting a heating device in the second zone after reaching the second zone; when the workpiece passing through the second zone does not reach the required temperature, automatically starting a heating device in the third zone after reaching the third zone, so that the forging circle reaches the tempering temperature;
and sending the workpiece reaching the tempering temperature into quenching liquid for quenching treatment.
Wherein, the temperature of the quenching liquid for quenching the forged circle is controlled by: 15-55 ℃, and controlling the concentration of quenching liquid: 6-8%.
The invention relates to a preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circles, which comprises the steps of heating steel ingots to a specified temperature in a vacuum heating furnace; taking out the steel ingot and forging the steel ingot under the protection of nitrogen to obtain a forged circle; cooling the forged circle to a first temperature and then taking out; quenching the forged circle; annealing the forged circle; tempering the forged circle. Therefore, the forging circle can be heated and forged in a protection state, and the forging circle can not be contacted with external air to generate reaction in the processes, so that a cleaning machine is not required to be used for continuously removing ferric oxide on the surface of the red hot forging blank, the working efficiency and the forging quality of the carbon manganese steel S355J2G3 forging circle are improved, and the mass production application can be realized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circles;
fig. 2 is a flow chart of the present invention for heating a steel ingot to a specified temperature in a vacuum heating furnace;
fig. 3 is a flow chart of the invention for taking out a steel ingot and forging the steel ingot under nitrogen protection to obtain a forged circle;
FIG. 4 is a flow chart of the invention after cooling the forged circle to a first temperature;
fig. 5 is a flow chart of sand production when the forged round temperature value is reduced to the first temperature.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 to 5, the invention provides a method for preparing low temperature impact resistant carbon manganese steel S355J2G3 forged circle, comprising:
s101, heating the steel ingot to a specified temperature in a vacuum heating furnace;
the method comprises the following specific steps:
s201, loading the steel ingot into a heating furnace with the temperature of 600-660 ℃ and the heat preservation time of 7-11 hours;
s202 is heated to 850-880 ℃ at a heating rate of 80-100 ℃/h, is preserved for 11-13 hours, S203 is heated to 1140-1200 ℃ of forging temperature, and is discharged after being preserved.
Under the condition of hot charging, the charging temperature is increased, the temperature difference is increased, the heat transfer speed is accelerated, and the time from the steel ingot to the charging temperature is shortened. And after the furnace is charged, the furnace is kept for a certain time, so that the internal and external temperatures are kept consistent, the structure is homogenized, and the preparation is made for the next step of staged preheating and austenitizing. The preheating temperature is increased to the austenitizing temperature, so that the whole preheating process and the austenite transformation process of the steel ingot are completed in the preheating stage, the preheating and heating time is shortened, the temperature difference heated to the forging temperature is reduced, and the direct heating to the forging temperature is ensured. Because the austenite has good plasticity and toughness, the heating speed can be properly increased, the austenite is directly heated to the forging temperature at a larger heating speed, and the time for heating to the forging temperature and the heat preservation time are shortened.
S102, taking out the steel ingot, and forging the steel ingot under the protection of nitrogen to obtain a forged circle;
the method comprises the following specific steps:
s301, placing the steel ingot into a protection device filled with nitrogen;
the forging and pressing process is carried out in a sealed state, and nitrogen circularly flows in the space, so that the nitrogen can protect the steel ingot and avoid the reaction caused by contact of the steel ingot with oxygen in the air.
S302, forging and pressing the steel ingot into square columns by adopting a forging and pressing head;
forging and pressing the steel ingot into square columns to obtain a rotating shaft can be adopted.
S303 again forges the square column into a cylinder.
And then pushing the square column to rotate to forge the edges for multiple times, and finally forging and pressing the steel ingot into a cylinder. The forging temperature is 780-1050 ℃.
S103, cooling the forged circle to a first temperature and then taking out;
the method comprises the following specific steps:
s401, actively cooling the forged circle obtained after forging by a fan for 30-40 min, and then burying sand;
the forging cylinder is cooled in various modes, and the invention adopts the active cooling of the fan and the sand burying cooling for rapid cooling, wherein the fan accelerates the flow speed of air around the forging cylinder so as to improve the heat dissipation efficiency, and the sand can improve the heat conduction efficiency, and can lead the heat conduction to be more uniform, so that the sand burying mode is adopted during the rear end cooling.
S402, inserting heat dissipation rods into sand around the forged circle;
the heat dissipation rod is made of high heat conduction materials, so that the heat conduction efficiency can be further improved, and the forging cylinder can be cooled more quickly.
S403, a threaded rod is arranged on the radiating rod to stir the sand for radiating;
the threaded rod can be driven by a motor, so that sand can be driven to turn up and down to accelerate heat dissipation.
S404, performing air cooling heat dissipation on sand at the top of the forging;
the sand contacted with the forged circle has high temperature, and then turns to the top through the threaded rod, so that the heat can be quickly dissipated through air cooling.
And S405, sand is produced when the forging circle temperature value is reduced to the first temperature.
The method comprises the following specific steps:
s501, detecting the surface temperature of the forging cylinder by inserting a plurality of sensors into sand;
it is difficult to measure the temperature near the forging cylinder at the surface, so that a plurality of temperature sensors resistant to high temperature can be provided along the dimension direction of the forging cylinder to measure the temperature.
S502, averaging the values of the plurality of sensors to obtain an average temperature value;
because of errors caused by the temperature sensors, in order to reduce the calculated amount, an average value of the acquired values can be obtained by directly adopting a mode of averaging the values of the temperature sensors, and the average value can be used as the current temperature value of the forging cylinder.
And S503, sand is produced when the average temperature value is reduced to the first temperature.
When the average temperature value is reduced to a first temperature (120-140 ℃), the forging cylinder can be taken out of the sand.
S104, quenching the forged circle;
when the workpiece passing through the first zone does not reach the required temperature, automatically starting a heating device in the second zone after reaching the second zone; when the workpiece passing through the second zone does not reach the required temperature, automatically starting a heating device in the third zone after reaching the third zone, so that the forging circle reaches the tempering temperature;
and sending the workpiece reaching the tempering temperature into quenching liquid for quenching treatment.
The temperature of the quenching liquid for quenching the forged circle is controlled by: 15-55 ℃, and controlling the concentration of quenching liquid: 6-8%.
The heating can be more uniform through multistage heating.
S105, annealing the forged circle;
first re-annealing: the temperature is raised to 720+/-15 ℃ in a step mode, the temperature is kept for 4 hours, then the temperature is reduced, the temperature reduction rate is less than or equal to 50 ℃/h, the step temperature point is 25 ℃ and 530 ℃, and the step temperature keeping time is 3 hours. Followed by a second anneal: the temperature is raised to 950+/-10 ℃ in a step mode, the temperature is kept for 5 hours, then the temperature is reduced, the temperature reduction rate is less than or equal to 50 ℃/h, the step temperature points are 310, 520 and 780 ℃, and the step temperature keeping time is 3 hours.
S106, tempering the forged circle.
In the two-stage isothermal tempering mode, i.e. in the tempering process, isothermal tempering is firstly carried out for 3-5 hours at 600-630 ℃, then isothermal tempering is carried out for 2-5 hours at 820-900 ℃, and then cooling is carried out at constant speed to normal temperature.
The invention relates to a preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circles, which comprises the steps of heating steel ingots to a specified temperature in a vacuum heating furnace; taking out the steel ingot and forging the steel ingot under the protection of nitrogen to obtain a forged circle; cooling the forged circle to a first temperature and then taking out; quenching the forged circle; annealing the forged circle; tempering the forged circle. Therefore, the forging circle can be heated and forged in a protection state, and the forging circle can not be contacted with external air to generate reaction in the processes, so that a cleaning machine is not required to be used for continuously removing ferric oxide on the surface of the red hot forging blank, the working efficiency and the forging quality of the carbon manganese steel S355J2G3 forging circle are improved, and the mass production application can be realized.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (7)
1. A preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circles is characterized in that,
comprising the following steps: heating the steel ingot to a specified temperature in a vacuum heating furnace;
taking out the steel ingot and forging the steel ingot under the protection of nitrogen to obtain a forged circle;
cooling the forged circle to a first temperature and then taking out;
quenching the forged circle;
annealing the forged circle; annealing the forged circle specifically comprises the following steps: first re-annealing: step heating to 720+/-15 ℃, preserving heat for 4 hours, then cooling, wherein the cooling rate is less than or equal to 50 ℃/h, the step temperature is 25 ℃ and 530 ℃, and the step heat preservation time is 3 hours; followed by a second anneal: step heating to 950+/-10 ℃, preserving heat for 5 hours, then cooling, wherein the cooling rate is less than or equal to 50 ℃/h, the step temperature points are 310, 520 and 780 ℃, and the step heat preservation time is 3 hours;
tempering the forged circle.
2. The method for preparing the low-temperature impact resistant carbon manganese steel S355J2G3 forged circle according to claim 1, which is characterized in that,
the specific steps of heating the steel ingot to the specified temperature in the vacuum heating furnace are as follows:
putting the steel ingot into a heating furnace with the temperature of 600-660 ℃ and the heat preservation time of 7-11 hours;
heating to 850-880 ℃ at a heating rate of 80-100 ℃/h, preserving heat for 11-13 hours,
heating to 1140-1200 deg.c, maintaining and discharging.
3. The method for preparing the low-temperature impact resistant carbon manganese steel S355J2G3 forged circle according to claim 1, which is characterized in that,
the specific steps of taking out the steel ingot and forging the steel ingot under the protection of nitrogen to obtain a forged circle are as follows:
putting the steel ingot into a protection device filled with nitrogen;
forging and pressing the steel ingot into square columns by adopting a forging and pressing head;
and forging the square column into a cylinder again.
4. The method for preparing the low-temperature impact resistant carbon manganese steel S355J2G3 forged circle according to claim 1, which is characterized in that,
the specific steps of taking out the forged round after cooling to the first temperature are as follows:
actively cooling the forged circle obtained after forging by a fan for 30-40 min, and then burying sand;
inserting a heat radiation rod into sand around the forged circle;
the heat dissipation rod is provided with a threaded rod for stirring sand to dissipate heat;
performing air cooling and heat dissipation on sand at the top of the forging;
and (5) sand is produced when the forging circle temperature value is reduced to the first temperature.
5. The method for preparing the low-temperature impact resistant carbon manganese steel S355J2G3 forged circle according to claim 4, which is characterized in that,
the concrete steps of sand production when the forging circle temperature value is reduced to the first temperature are as follows:
detecting the surface temperature of the forging cylinder by inserting a plurality of sensors into sand;
averaging the values of the plurality of sensors to obtain an average temperature value;
and sand is produced when the average temperature value is reduced to the first temperature.
6. The method for preparing the low-temperature impact resistant carbon manganese steel S355J2G3 forged circle according to claim 1, which is characterized in that,
the specific mode for quenching the forged circle is as follows: when the workpiece passing through the first zone does not reach the required temperature, automatically starting a heating device in the second zone after reaching the second zone; when the workpiece passing through the second zone does not reach the required temperature, automatically starting a heating device in the third zone after reaching the third zone, so that the forging circle reaches the tempering temperature;
and sending the workpiece reaching the tempering temperature into quenching liquid for quenching treatment.
7. The method for preparing the low-temperature impact resistant carbon manganese steel S355J2G3 forged circle according to claim 6, which is characterized in that,
the temperature of the quenching liquid for quenching the forged circle is controlled by: 15-55 ℃, and controlling the concentration of quenching liquid: 6-8%.
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| JP2016145380A (en) * | 2015-02-06 | 2016-08-12 | 株式会社神戸製鋼所 | Steel for large sized forging and large sized forging component |
| CN106854691B (en) * | 2016-10-31 | 2019-04-05 | 广东长盈精密技术有限公司 | The forging method of steel part |
| CN109280754A (en) * | 2018-11-21 | 2019-01-29 | 东北大学无锡研究院 | A kind of casting skin hardening and tempering process method for producing CrNiMo alloy steel forging circle |
| CN109182676B (en) * | 2018-11-21 | 2020-08-25 | 东北大学无锡研究院 | Preparation method of low-temperature impact resistant carbon manganese steel S355J2G3 forged circle |
| CN109680218A (en) * | 2019-01-25 | 2019-04-26 | 无锡市法兰锻造有限公司 | A kind of production method improving forging ballistic work |
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