CN112575256A - High-strength and high-toughness large-diameter wind power bolt with shell/horse complex phase structure and preparation method thereof - Google Patents
High-strength and high-toughness large-diameter wind power bolt with shell/horse complex phase structure and preparation method thereof Download PDFInfo
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- 238000005096 rolling process Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 26
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
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- 229910045601 alloy Inorganic materials 0.000 claims abstract description 21
- 239000000956 alloy Substances 0.000 claims abstract description 21
- 238000009749 continuous casting Methods 0.000 claims abstract description 19
- 238000007670 refining Methods 0.000 claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 10
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 10
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- 238000003754 machining Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 16
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
-
- 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
- C21D2211/002—Bainite
-
- 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
Abstract
The invention provides a high-strength and high-toughness large-diameter wind power bolt with a shell/horse complex phase structure and a preparation method thereof, belonging to the field of high-strength large-diameter fasteners in the wind power equipment industry. The high-strength-toughness large-diameter wind power bolt comprises the following alloy component systems in percentage by mass: 0.15-0.25% of C, 0.8-2.0% of Si, 1.5-2.5% of Mn, 0.6-1.2% of Cr0.2%, 0.2-0.4% of Mo0.06-0.12% of V, less than 0.015% of P, less than 0.015% of S and the balance of Fe. Firstly, preparing a required bar by a converter, external refining, vacuum degassing, continuous casting and bar rolling, and then carrying out machining and special heat treatment on the bar to obtain the high-strength, high-toughness and large-diameter wind power bolt with a bainite/martensite multiphase structure, wherein the performance grade is more than or equal to 12.9 grade. The invention has simple process flow and stable process parameters, and adopts a novel quenching and partitioning process to obtain the combination of high toughness.
Description
Technical Field
The invention relates to the field of high-strength large-diameter fasteners in the wind power equipment industry, in particular to a high-strength high-toughness large-diameter wind power bolt with a bainite/martensite multiphase structure.
Background
The wind generating set is a key device for converting wind energy into electric energy. The wind turbine generally comprises three parts, namely a wind wheel, a generator and a tower. A large part of the connection between the wind turbine generator equipment is realized through a bolt connection pair; a large number of high-strength large-diameter wind power bolts are required.
At present, high-strength wind power bolts used in wind turbine generators are mainly classified into tower bolts, complete machine bolts and blade bolts. In the actual use process, the comprehensive mechanical property, the installation method, the lubrication and the like of the bolts all affect the reliability of bolt connection, comprehensive consideration is needed, and once the reliability of bolt connection fails, the wind turbine generator is damaged difficultly and generates great economic loss.
Because the size and the direction of the wind speed in a wind field are random, the loads borne by the bolts in the service process are quite complex and variable, and besides the axial pre-tightening load, the bolts are also often subjected to tension-tension alternating load, transverse shear alternating load and composite bending load. The requirements on the comprehensive mechanical properties of the materials of the bolts are stricter.
In addition, the wind turbine generator needs to be arranged in areas with sufficient wind power resources, and the areas are difficult to avoid extremely severe environments such as low temperature, sand storm, humidity, corrosivity and the like, so that the wind turbine generator in the environment can normally and stably operate, and strict requirements are provided for the reliability of the bolt connection.
The existing materials for manufacturing large wind power bolts (not less than M36 mm) are mostly 42CrMoA, B7, 40CrNiMoA and the like, the performance grade is mostly 10.9 grade, 12.9 grade cannot be obtained, the heat treatment mode is quenching and high-temperature tempering, and the basic full metallographic structure is a tempered sorbite. However, in the actual use process, the uneven structure is often found, the phenomena of soft points, microcracks or cracks are easy to appear in the use process, and meanwhile, the toughness is found to be insufficient, so that the use requirement is difficult to meet, and the great safety problem is brought to the wind turbine generator.
In recent years, the height of towers in wind power equipment is increased year by year, and blades tend to be large-sized, which undoubtedly puts higher requirements on the comprehensive performance of fasteners of the wind power equipment. The prior steel for wind power bolts is obviously not satisfactory.
For example, the current application publication number CN 108179356a discloses a steel for high-through-quenching large-size wind power bolts and a manufacturing method thereof, and the steel comprises the following chemical components in percentage by weight: 0.35 to 0.45 percent of C, less than or equal to 0.20 percent of Si, 0.60 to 1.00 percent of Mn0.012 percent of P, less than or equal to 0.005 percent of S, 1.00 to 1.50 percent of Cr, 0.15 to 0.40 percent of Mo, 0.0005 to 0.003 percent of B, 0.03 to 0.08 percent of Ti, 0.02 to 0.05 percent of Als, less than or equal to 0.005 percent of N, 0.0001 to 0.0003 percent of Ca0.0001, and the balance of Fe and inevitable impurities. The method is characterized in that: converter, external refining, vacuum degassing, continuous casting and bar rolling; the specific process parameters are as follows: blowing argon for 10-15 minutes after external refining, ladle casting, and controlling the superheat degree of a tundish at 15-35 ℃; heating and insulating the continuous casting billet at 1150-1250 ℃ for 2 hours, and then rolling, wherein in the rough rolling stage, 1050-1150 ℃; and in the finish rolling stage, the temperature is 900-1050 ℃, the temperature of the steel plate entering a cooling bed is 800-850 ℃, and the steel plate is naturally cooled after rolling. The bolt is manufactured by machining, and the tempered sorbite structure is obtained by quenching at 880 ℃ and tempering heat treatment at 550 ℃, wherein the tensile strength Rm is more than or equal to 1350MPa, RP0.2≥1150MPa，AKV(-40℃)≥32J。
From the above, it is obvious that the steel for large-size wind power bolts and the manufacturing method thereof are still the traditional methods for optimizing alloy components and refining crystal positions, the metallographic structure is a tempered sorbite, important parameters of elongation after fracture A and reduction of area Z are not mentioned, and specific applications are not reported, for example, it is extremely difficult to further improve the mechanical properties of the steel.
Disclosure of Invention
The invention provides a high-strength and high-toughness large-diameter wind power bolt with a bainite/martensite multiphase structure and a preparation method thereof. The method has the advantages of simple operation and low cost, and the super bainite structure is obtained by optimizing the traditional alloy components and utilizing a novel heat treatment method, so that the high-strength and high-toughness large-diameter wind power bolt is produced, and the large-scale production is easy.
The invention provides a high-strength and high-toughness large-diameter wind power bolt with a bainite/martensite multiphase structure, which comprises the following alloy components in percentage by mass: 0.15-0.25% of C, 0.8-2.0% of Si, 1.5-2.5% of Mn, 0.6-1.2% of Cr0.2%, 0.2-0.4% of Mo0.06-0.12% of V, less than 0.015% of P, less than 0.015% of S and the balance of Fe.
Preferably, the metallographic structure of the high-strength, high-toughness and large-diameter wind power bolt material is tempered martensite, lower bainite and residual austenite.
Preferably, the tensile strength Rm of the high-strength-toughness large-diameter wind power bolt is more than or equal to 1385MPa, the specified non-proportional extension strength Rp is more than or equal to 1157MPa, the elongation A after fracture is more than or equal to 16.5%, the reduction of area Z is more than or equal to 55%, and AKV (-40 ℃), is more than or equal to 33.82J.
Preferably, the hardness of the central part of the screw of the high-strength, high-toughness and large-diameter wind power bolt is more than or equal to 430.6HV, the hardness of the 1/2R part of the screw is more than or equal to 432.4HV, and the hardness of the edge part of the screw is more than or equal to 428.7 HV.
A preparation method of a high-strength, high-toughness and large-diameter wind power bolt with a bainite/martensite multiphase structure comprises the steps of firstly preparing a required bar through a converter, external refining, vacuum degassing, continuous casting and bar rolling, and then carrying out fixed-length saw cutting, nut induction heating upsetting, bar machining, heat treatment and thread rolling on the bar to obtain the high-strength, high-toughness and large-diameter wind power bolt with the bainite/martensite multiphase structure.
Preferably, the specific preparation process of the required bar is as follows: firstly smelting alloy through a converter, carrying out external refining on the smelted alloy molten steel, then blowing argon for 10-15 minutes to carry out vacuum degassing, then carrying out ladle casting and obtaining a continuous casting billet through continuous casting, finally carrying out rolling on the continuous casting billet after heating at 1100-1150 ℃ and keeping the temperature for 1-2 hours, and carrying out annealing and flaw detection after rolling to obtain the alloy.
Preferably, the specific preparation process of the high-strength-toughness large-diameter wind power bolt comprises the following steps: firstly, preparing a required bar, then, carrying out fixed-length saw cutting on the required bar, carrying out nut induction heating upsetting and rod machining according to the size of the finally prepared high-strength, high-toughness and large-diameter wind power bolt, then, heating at 910-950 ℃, and quenching to 180-240 ℃; then, distributing at the distribution temperature of 280-340 ℃; finally, the material which completely meets the requirements in size and is subjected to distribution processing is subjected to thread rolling to obtain the finished product.
Preferably, the CCT curve of the material is measured before the desired bar is cut to length, and important parameters for primary control are determined.
Preferably, M36 x 340 sample is selected according to NB/T31082-; subsequent thread rolling also needs to be performed according to the selected size of the M36X 340 sample pattern.
Preferably, the test data is sent to a third-party detection mechanism for detection according to the GB/T228.1-2010 standard, so that tensile and impact test data and section hardness test data are obtained, and the performance requirements of the high-strength and high-toughness large-diameter wind power bolt with the large diameter of 12.9 grades or above are completely met.
The technical scheme of the invention has the following beneficial effects:
(1) according to the invention, Si, Mn and Fe are mainly used as wind power bolt material components, Cr is reduced, Ni is not contained, alloy components are optimized, and the cost is saved;
(2) the invention has simple process flow and stable process parameters, and saves time and cost by adopting the prior mature steel-making, continuous casting and continuous rolling production process;
(3) aiming at the optimized alloy component bar, a novel quenching and partitioning process is adopted, the percentage contents of nano martensite, nano lower bainite and nano residual austenite are accurately regulated and controlled, and the high-strength, high-toughness and large-diameter wind power bolt with strength and toughness matching is obtained;
(4) the high-strength-toughness large-diameter wind power bolt has the tensile strength Rm of more than or equal to 1385MPa, the specified non-proportional extension strength Rp of more than or equal to 1157MPa, the elongation A after fracture of more than or equal to 16.5 percent, the reduction of area Z of more than or equal to 55 percent and AKV (alkyl ketene dimer) (40 ℃ below zero) of more than or equal to 33.82J.
Drawings
The technical solution in the embodiments of the present patent will be further explained with reference to the drawings in the embodiments of the present patent.
FIG. 1 is a scanning electron microscope SEM image of a rod section of the high-strength, high-toughness and large-diameter wind power bolt;
FIG. 2 is a sample tension curve at wind turbine bolt shank 1/2R;
FIG. 3 is a diagram of a high-toughness M36X 340 large-diameter wind power bolt with a bainite/martensite phase structure.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention aims to solve the technical problems that the existing large-size wind power bolt steel and the manufacturing method thereof are obviously still the traditional method for optimizing alloy components and refining crystal positions, the metallographic structure is a tempered sorbite, important parameters of elongation A after fracture and section shrinkage Z are not mentioned, and specific application is not reported, and if the mechanical property is further improved, the method is extremely difficult. The steel for large-size wind power bolts and the manufacturing method thereof cannot meet the increasing requirements of large sizes on the steel for the wind power bolts.
In order to solve the technical problems, the invention provides a high-strength and high-toughness large-diameter wind power bolt with a bainite/martensite multiphase structure, wherein an alloy component system of the high-strength and high-toughness large-diameter wind power bolt is as follows by mass percent: 0.15-0.25% of C, 0.8-2.0% of Si, 1.5-2.5% of Mn, 0.6-1.2% of Cr0.2%, 0.2-0.4% of Mo0.06-0.12% of V, less than 0.015% of P, less than 0.015% of S and the balance of Fe.
Optionally, the metallographic structure of the high-strength, high-toughness and large-diameter wind power bolt material is tempered martensite, lower bainite and residual austenite.
Optionally, the tensile strength Rm of the high-strength-toughness large-diameter wind power bolt is more than or equal to 1385MPa, the specified non-proportional extension strength Rp is more than or equal to 1157MPa, the elongation A after fracture is more than or equal to 16.5%, the reduction of area Z is more than or equal to 55%, and AKV (-40 ℃), is more than or equal to 33.82J.
Optionally, the hardness of the central part of the screw of the high-strength, high-toughness and large-diameter wind power bolt is more than or equal to 430.6HV, the hardness of the 1/2R part of the screw is more than or equal to 432.4HV, and the hardness of the edge part of the screw is more than or equal to 428.7 HV.
A preparation method of a high-strength, high-toughness and large-diameter wind power bolt with a bainite/martensite multiphase structure comprises the steps of firstly preparing a required bar through a converter, external refining, vacuum degassing, continuous casting and bar rolling, and then carrying out fixed-length saw cutting, nut induction heating upsetting, bar machining, heat treatment and thread rolling on the bar to obtain the high-strength, high-toughness and large-diameter wind power bolt with the bainite/martensite multiphase structure.
Optionally, the specific preparation process of the required bar is as follows: firstly smelting alloy through a converter, carrying out external refining on the smelted alloy molten steel, then blowing argon for 10-15 minutes to carry out vacuum degassing, then carrying out ladle casting and obtaining a continuous casting billet through continuous casting, finally carrying out rolling on the continuous casting billet after heating at 1100-1150 ℃ and keeping the temperature for 1-2 hours, and carrying out annealing and flaw detection after rolling to obtain the alloy.
Optionally, the specific preparation process of the high-strength and high-toughness large-diameter wind power bolt comprises the following steps: firstly, preparing a required bar, then, carrying out fixed-length saw cutting on the required bar, carrying out nut induction heating upsetting and rod machining according to the size of the finally prepared high-strength, high-toughness and large-diameter wind power bolt, then, heating at 910-950 ℃, and quenching to 180-240 ℃; then, distributing at the distribution temperature of 280-340 ℃; finally, the material which completely meets the requirements in size and is subjected to distribution processing is subjected to thread rolling to obtain the finished product.
Alternatively, the CCT curve of the material may be measured before the desired bar is cut to length to determine important parameters for primary control.
Optionally, selecting an M36X 340 sample from NB/T31082-; subsequent thread rolling also needs to be performed according to the selected size of the M36X 340 sample pattern.
Optionally, the test data is sent to a third-party detection mechanism for detection according to the GB/T228.1-2010 standard, so that tensile and impact test data and section hardness test data are obtained, and the performance requirements of the high-strength, high-toughness and large-diameter wind power bolt with the large diameter of 12.9 grades or above are completely met.
The specific implementation mode is as follows:
1. the method is characterized in that raw material proportioning is carried out according to the alloy component system of the high-strength, high-toughness and large-diameter wind power bolt, and the required bar is prepared by converter steelmaking, external refining, vacuum degassing, continuous casting and bar rolling in sequence, wherein the specific process parameters are as follows: blowing argon for 10-15 minutes after refining outside the furnace, carrying out vacuum degassing, and carrying out ladle casting; heating and preserving heat for 1-2 hours at 1100-1150 ℃ for a continuous casting slab, rolling, annealing and detecting flaws after rolling a bar;
2. the CCT curve of the material is measured, and important parameters such as key phase transition temperature and the like which are mainly controlled are determined;
3. testing the thermoplastic region of the material;
4. selecting an M36X 340 sample picture from NB/T31082-;
5. the heat treatment process for producing the wind power bolt is formulated according to the thermoplasticity of the material under the condition of industrial production and manufacturing: heating at 910-950 ℃ and preserving heat for 1-2 hours, and quenching to 180-240 ℃; then, distributing at the distribution temperature of 280-340 ℃;
6. rolling according to the requirement of NB/T31082 and 2016, wherein the finished wind power bolt is shown in FIG. 3;
7. sending to a qualified third-party detection mechanism for detection according to GB/T228.1-2010 standard, taking three bolts for mechanical property test, wherein the tensile test result is shown in figure 2, the tensile and impact test data of the three bolts are detailed in table 1, and the Vickers hardness test data of the three bolts are detailed in table 2;
TABLE 1 three bolt tensile and impact test data
TABLE 2 hardness test data for three bolt sections
| Sample number | Hardness of screw core | Hardness at screw 1/2R | Hardness of screw edge |
| 1# | 436.5 | 434.6 | 429.3 |
| 2# | 430.6 | 432.4 | 428.7 |
| 3# | 438.1 | 442.2 | 430.3 |
8. The metallographic structure comprises tempered martensite, lower bainite and residual austenite, and is shown in figure 1.
As can be seen from the above table, the tensile strength Rm of the high-strength-toughness large-diameter wind power bolt is more than or equal to 1385MPa, the specified non-proportional extension strength Rp is more than or equal to 1157MPa, the elongation A after fracture is more than or equal to 16.5%, the reduction of area Z is more than or equal to 55%, and AKV (-40 ℃), is more than or equal to 33.82J; the use requirements of the high-strength and high-toughness large-diameter wind power bolt with the large diameter of 12.9 grades or above are completely met.
In conclusion, Si, Mn and Fe are mainly used as the wind power bolt material components, Cr is reduced, Ni is not contained, the alloy components are optimized, and the cost is saved; the invention has simple process flow and stable process parameters, and saves time and cost by adopting the prior mature steel-making, continuous casting and continuous rolling production process; the invention adopts a novel quenching and partitioning process aiming at the optimized alloy component bar, accurately regulates and controls the percentage contents of nano martensite, nano lower bainite and nano residual austenite, and obtains the high-strength, high-toughness and large-diameter wind power bolt with strength and toughness matching.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The high-strength, high-toughness and large-diameter wind power bolt with the bainite/martensite multiphase structure is characterized in that an alloy component system of the high-strength, high-toughness and large-diameter wind power bolt is as follows in percentage by mass: 0.15-0.25% of C, 0.8-2.0% of Si, 1.5-2.5% of Mn, 0.6-1.2% of Cr0.2%, 0.2-0.4% of Mo0.06-0.12% of V, less than 0.015% of P, less than 0.015% of S and the balance of Fe.
2. The high-toughness large-diameter wind power bolt with the bainite/martensite multiphase structure according to claim 1, wherein the metallographic structure of the high-toughness large-diameter wind power bolt material is tempered martensite, lower bainite and retained austenite.
3. The high-strength large-diameter wind power bolt with the bainite/martensite multiphase structure is characterized in that the tensile strength Rm of the high-strength large-diameter wind power bolt is more than or equal to 1385MPa, the specified nonproportional elongation Rp is more than or equal to 1157MPa, the elongation A after fracture is more than or equal to 16.5%, the reduction of area Z is more than or equal to 55%, and AKV (-40 ℃) is more than or equal to 33.82J.
4. The high-strength and high-toughness large-diameter wind power bolt with the bainite/martensite multiphase structure as claimed in claim 1, wherein the hardness of the core of the screw of the high-strength and high-toughness large-diameter wind power bolt is not less than 430.6HV, the hardness of the 1/2R position of the screw is not less than 432.4HV, and the hardness of the edge of the screw is not less than 428.7 HV.
5. The preparation method of the high-strength, high-toughness and large-diameter wind power bolt with the bainite/martensite structure as claimed in claim 1 is characterized in that the required bar is prepared by firstly using a converter, external refining, vacuum degassing, continuous casting and bar rolling, and then the bar is subjected to sizing saw cutting, nut induction heating upsetting, bar machining, heat treatment and thread rolling to obtain the high-strength, high-toughness and large-diameter wind power bolt with the bainite/martensite structure.
6. The preparation method according to claim 5, wherein the specific preparation process of the required bar is as follows: firstly smelting alloy through a converter, carrying out external refining on the smelted alloy molten steel, then blowing argon for 10-15 minutes to carry out vacuum degassing, then carrying out ladle casting and obtaining a continuous casting billet through continuous casting, finally carrying out rolling on the continuous casting billet after heating at 1100-1150 ℃ and keeping the temperature for 1-2 hours, and carrying out annealing and flaw detection after rolling to obtain the alloy.
7. The preparation method of claim 6, wherein the specific preparation process of the high-strength-toughness large-diameter wind power bolt is as follows: firstly, preparing a required bar, then, carrying out fixed-length saw cutting on the required bar, carrying out nut induction heating upsetting and rod machining according to the size of the finally prepared high-strength, high-toughness and large-diameter wind power bolt, then, heating at 910-950 ℃, and quenching to 180-240 ℃; then, distributing at the distribution temperature of 280-340 ℃; finally, the material which completely meets the requirements in size and is subjected to distribution processing is subjected to thread rolling to obtain the finished product.
8. The method of claim 7, wherein the CCT curve of the material is determined before the desired bar is cut to length, and important parameters for primary control are determined.
9. The method as claimed in claim 7, wherein M36 x 340 sample selected from NB/T31082-; subsequent thread rolling also needs to be performed according to the selected size of the M36X 340 sample pattern.
10. The preparation method of the wind power bolt of the 12.9-grade or above high strength and toughness and the large diameter is characterized in that the wind power bolt is sent to a third-party detection mechanism for detection according to the GB/T228.1-2010 standard to obtain tensile and impact test data and section hardness test data, and the performance requirements of the wind power bolt of the 12.9-grade or above high strength and toughness and the large diameter are completely met.
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