CN114410894B - Method for reducing quenching cracks of 12Cr2Mo1VR steel - Google Patents
Method for reducing quenching cracks of 12Cr2Mo1VR steel Download PDFInfo
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- CN114410894B CN114410894B CN202111621569.6A CN202111621569A CN114410894B CN 114410894 B CN114410894 B CN 114410894B CN 202111621569 A CN202111621569 A CN 202111621569A CN 114410894 B CN114410894 B CN 114410894B
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- Y02P10/20—Recycling
Abstract
The invention relates to a method for reducing quenching cracks of 12Cr2Mo1VR steel, which comprises the steps of steel plate smelting, rolling and heat treatment, wherein the heat treatment adopts a low-temperature quenching, water-in reddening and tempering process, the quenching heating temperature is 900-920 ℃, and the heat preservation is 120-150min. The P, H content in the steel is reduced in the smelting process; the rolling process adopts a high-temperature high-reduction rolling process. The 12Cr2Mo1VR steel produced by the method has no quenching cracks after quenching and no aging cracks after placing, and the steel plate has stable performance, the yield strength is 450-550MPa, the tensile strength is 620-670MPa, and the impact at minus 20 ℃ is more than or equal to 120J.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for reducing quenching cracks of 12Cr2Mo1VR steel.
Background
The main reason for quenching cracking of the steel sheet is that the tensile stress generated during cooling exceeds the tensile strength of the steel. Inclusions, large carbides, and various micro cracks originally in the steel, which adversely affect the strength of the steel, promote cracking of the workpiece during quenching and cooling. According to the formation time of the quenching cracks, the quenching cracks are divided into cracks formed in the quenching process and cracks generated in the room-temperature placing process after quenching, and the cracks are called aging cracks.
The alloy content of the 12Cr2Mo1VR steel is high, and the production period is long. In the smelting process, a large amount of alloy and slag forming agent are required to be added, and the control difficulty of harmful elements and inclusions is high; in the casting process, obvious component segregation phenomenon is easy to generate, so that a large number of microcrack defects are easy to generate in the ingot blank. Because the steel plate has strict performance requirements, a quenching and tempering production process is required to be adopted in the heat treatment process. The steel plate is easy to generate quenching cracks in the quenching process because of microcrack defects caused by harmful elements, inclusions and component segregation in the steel.
For a 12Cr2Mo1VR steel plate, if cracks are generated after quenching, the steel plate is used after repairing if light and is directly judged to be wasted if heavy, and economic losses are caused; if aging cracks are generated, the steel plate is cracked after being delivered to users, so that not only is the loss of the users compensated, but also the enterprises are affected very badly. Therefore, the invention optimizes the steel plate smelting, rolling and heat treatment process to reduce the quenching cracks of the 12Cr2Mo1VR steel plate.
Disclosure of Invention
The invention aims to provide a method for reducing quenching cracks of 12Cr2Mo1VR steel, the 12Cr2Mo1VR steel produced by the method has no quenching cracks after quenching, no aging cracks after placing, and stable steel plate performance.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a method for reducing quenching cracks of 12Cr2Mo1VR steel comprises the steps of steel plate smelting, rolling and heat treatment, wherein the heat treatment adopts the low-temperature quenching, water-in reddening and tempering processes, the quenching heating temperature is 900-920 ℃, and the heat preservation is carried out for 120-150min.
Further, water is added for 15-20min after quenching and heating, and the reddening temperature is 250-300 ℃.
Further, the tempering temperature is 690-710 ℃, and the temperature is kept for 150-180min.
Furthermore, the rolling process adopts a high-temperature high-reduction rolling process, the rolling temperature is 950-990 ℃, and the pass reduction is 25-30mm.
Furthermore, in the steel plate smelting process, slag-free tapping of an electric furnace is required, P removal treatment is carried out after the steel plate is placed in a refining furnace, the P removal is required to be less than or equal to 0.002%, the P content of a finished product after smelting is less than or equal to 0.005%, and the H content is less than or equal to 0.0002%.
Further, the refined molten steel is subjected to vacuum degassing treatment, the argon blowing amount is increased in the vacuum process, the argon flow is 100-300L/min, and the pressure is 0.4-0.5MPa.
Further, the soft blowing time after vacuum is more than or equal to 10min, the molten steel is required to be bareless, the argon flow is 25-35L/min, and the pressure is 0.2-0.3MPa.
The invention is based on the following principle: in the smelting process, the electric furnace does not have slag and tapping and has strict P content, so that the phenomenon of quenching cracks caused by higher P content can be reduced; the vacuum degassing treatment is carried out after refining, and the flow and the pressure of argon are strictly controlled, so that the H content in steel can be further reduced, and quenching cracks caused by overhigh H are reduced; after vacuum, soft blowing is carried out on molten steel, the flow and pressure of soft blowing argon are strictly controlled, the inclusion is ensured to fully float upwards, and the inclusion content in the steel is reduced; a high-temperature high-reduction rolling process is adopted in the rolling process, so that the lamination of microcrack defects in steel is ensured; the low-temperature quenching, water cooling reddening and tempering processes are adopted in the quenching process, so that the coarsening of crystal grains can be avoided and the quenching crack tendency is reduced on the premise of ensuring the performance of the steel plate.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: 1) The produced 12Cr2Mo1VR steel has no quenching cracks after quenching and no aging cracks after placing; 2) The produced 12Cr2Mo1VR steel has stable performance, the yield strength is 450-550MPa, the tensile strength is 620-670MPa, and the impact at minus 20 ℃ is more than or equal to 120J; 3) The method only optimizes the process, does not increase equipment investment, and has low production cost.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
A method for reducing quenching cracks of 12Cr2Mo1VR steel comprises the steps of steel plate smelting, rolling and heat treatment, and specifically comprises the following steps:
carrying out P removal treatment after slag-free tapping of an electric furnace and sitting in a refining furnace in the steel plate smelting process, wherein the P removal requirement is less than or equal to 0.002%, the P content of a finished product after smelting is less than or equal to 0.005%, and the H content is less than or equal to 0.0002%; vacuum degassing the refined molten steel, increasing argon blowing amount in the vacuum process, wherein the argon flow is 100-300L/min, and the pressure is 0.4-0.5Mpa; after vacuum, the soft blowing time is more than or equal to 10min, the molten steel is required to be bareless, the argon flow is 25-35L/min, and the pressure is 0.2-0.3MPa.
The rolling process adopts a high-temperature high-reduction rolling process, the rolling temperature is 950-990 ℃, and the pass reduction is 25-30mm.
The heat treatment process adopts a low-temperature quenching, water-in reddening and tempering process, the quenching heating temperature is 900-920 ℃, and the heat preservation is carried out for 120-150min; quenching and heating, and then adding water for 15-20min, wherein the reddening temperature is 250-300 ℃; tempering temperature is 690-710 ℃, and heat preservation is carried out for 150-180min.
Examples 1 to 8
In examples 1-8, the tapping condition of the electric furnace, the P content after P removal, the P content and the H content of a finished product after smelting in the smelting process are shown in Table 1; argon flow and pressure in the vacuum degassing and soft blowing process are shown in a table 2; the rolling temperature and the rolling reduction in the steel plate rolling process are shown in Table 3; the quenching temperature, the heat preservation time, the water inlet time, the reddening temperature, the tempering temperature and the heat preservation time in the steel plate heat treatment process are shown in the table 4.
The quench cracking, yield strength, tensile strength and impact properties of the steel sheets produced in examples 1-8 are shown in Table 5.
TABLE 1 electric furnace tapping conditions, P content after P removal, P content and H content of finished products after smelting in each example
Table 2 examples argon flow and pressure during vacuum degassing and soft blowing
TABLE 3 Rolling temperatures and reduction in the Rolling of Steel sheets of examples
Table 4 parameters of the heat treatment process for steel sheets of examples
Table 5 properties of the steel sheets of each example
As can be seen from Table 5, the 12Cr2Mo1VR steel produced by the method provided by the invention has no quenching cracks after quenching, no aging cracks after placing, stable steel plate performance, yield strength of 450-550MPa, tensile strength of 620-670MPa, and impact of-20 ℃ of more than or equal to 120J
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (2)
1. A method for reducing quenching cracks of 12Cr2Mo1VR steel is characterized by comprising the steps of smelting, rolling and heat treatment of a steel plate, wherein the heat treatment adopts a low-temperature quenching, water-in reddening and tempering process, the quenching heating temperature is 900-920 ℃, and the heat preservation is carried out for 120-150min;
adding water for 15-20min after quenching and heating, and returning to the red temperature of 250-300 ℃;
the tempering temperature is 690-710 ℃, and the temperature is kept for 150-180min;
the rolling process adopts a high-temperature high-reduction rolling process, the rolling temperature is 950-990 ℃, and the pass reduction is 25-30mm;
the smelting process requires slag-free tapping of an electric furnace, P removal treatment is carried out after the electric furnace is placed in a refining furnace, the P removal is required to be less than or equal to 0.002%, the P content of a finished product after smelting is completed is less than or equal to 0.005%, and the H content is less than or equal to 0.0002%;
vacuum degassing the refined molten steel, increasing argon blowing amount in the vacuum process, wherein the argon flow is 100-300L/min, and the pressure is 0.4-0.5MPa;
ensuring that the soft blowing time is more than or equal to 10min after vacuum, wherein molten steel is required to be bareless, the argon flow is 25-35L/min, and the pressure is 0.2-0.3MPa;
the 12Cr2Mo1VR steel produced by the method has no quenching cracks after quenching and no aging cracks after placing.
2. The method for reducing quenching cracks of 12Cr2Mo1VR steel according to claim 1, wherein the 12Cr2Mo1VR steel produced by the method has stable performance, yield strength of 450-550MPa, tensile strength of 620-670MPa, and impact of-20 ℃ of not less than 120J.
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| CN202111621569.6A CN114410894B (en) | 2021-12-28 | 2021-12-28 | Method for reducing quenching cracks of 12Cr2Mo1VR steel |
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| CN202111621569.6A CN114410894B (en) | 2021-12-28 | 2021-12-28 | Method for reducing quenching cracks of 12Cr2Mo1VR steel |
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| CN114410894B true CN114410894B (en) | 2023-08-22 |
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