CN112410689A - Steel for pin shaft of wind power gear box and preparation method thereof - Google Patents
Steel for pin shaft of wind power gear box and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
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- C—CHEMISTRY; METALLURGY
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- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
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Abstract
The invention is suitable for the technical field of steel, and provides wind power gear box pin shaft steel and a preparation method thereof, wherein the steel comprises the following chemical components in percentage by weight: c: 0.05-0.08%, Si: 0.2-0.4%, Mn: 0.4-0.5%, P: 0.01-0.03%, S: 0.005-0.009%, Cr: 0.9-1.3%, Mo: 0.9-1.2%, Ni: 0.3-0.6%, Nb: 0.01 to 0.04%, Ti: 0.01-0.02%, rare earth: 0.03-0.04%, synthetic fiber: 0.1-0.8%, and the balance of Fe and unavoidable impurities; the microstructure of the steel for the wind power gear box pin shaft is an austenite structure, the yield strength is 850-880 MPa, the tensile strength is 900-950 MPa, and the elongation is 12-16%. According to the invention, the carbon fiber is added in the chemical components of the steel, and the steel has certain flexibility after being prepared by the preparation method, so that the steel is more suitable for manufacturing the flexible pin shaft of the wind power gear box, thereby enhancing the floating space of the planet wheel in the wind power gear box, improving the flexibility of the transmission system of the wind power gear box, and reducing the phenomena that the planet carrier in the transmission system can be twisted and eccentric to a certain extent.
Description
Technical Field
The invention belongs to the technical field of steel, and particularly relates to steel for a pin shaft of a wind power gear box and a preparation method of the steel.
Background
With the support of the national new energy policy and the promotion of the large trend of low-carbon environmental protection development, wind power generation is used as a substitute in China, and with the support of the national new energy policy and the promotion of the large trend of low-carbon environmental protection development, various clean energy industries represented by wind power generation are rapidly developed in China. The wind power gear box is the most important of the wind power main engine, the light-weight and high-power structure and the high-reliability and long-service-life performance of the wind power gear box become the key fields of technical breakthrough, and especially, the addition of new technologies such as a flexible pin shaft and the like makes the optimization analysis of the gear box more important.
For a common industrial gear speed increasing box, the uneven degree of load between the teeth of the planetary gear system directly relates to the service life and the operation stability of the whole system. In a common speed increasing box, a conventional structure adopted by a transmission system is a double-side-plate planet carrier, each planet wheel is arranged on a structure with a rigid pin and a rolling bearing matched with the double-side plates, so that the planet wheels have no space capable of floating, the rigidity of the transmission system is high, and the non-uniform degree of loads between meshed gears depends on the form and position tolerance of design and the error of machining and installation. In a common wind power gear box, as in such a speed increaser, a certain torsion and eccentricity of a planet carrier in a transmission system occur, and the amplitude range depends on the material and the input torque of the planet carrier. In a transmission system of a plurality of planet wheels, the more serious the uneven load degree, the more easily the wind power gearbox gear is damaged to cause failure.
Therefore, a steel flexible pin shaft for manufacturing the wind power gear box is urgently needed to enhance the floating space of the planet wheel in the wind power gear box, improve the flexibility of a transmission system and reduce the phenomena that a planet carrier in the transmission system can be twisted and eccentric to a certain extent.
Disclosure of Invention
The invention provides steel for a wind power gear box pin shaft and a preparation method thereof, and aims to solve the problems that a steel is urgently needed in the background art to prepare a flexible pin shaft for a wind power gear box, so that the floating space of a planet wheel in the wind power gear box is enhanced, the flexibility of a transmission system is improved, and the phenomena that a planet carrier in the transmission system can be twisted and eccentric to a certain extent are reduced.
The invention is realized in such a way that the steel for the pin shaft of the wind power gear box comprises the following chemical components in percentage by weight: c: 0.05-0.08%, Si: 0.2-0.4%, Mn: 0.4-0.5%, P: 0.01-0.03%, S: 0.005-0.009%, Cr: 0.9-1.3%, Mo: 0.9-1.2%, Ni: 0.3-0.6%, Nb: 0.01 to 0.04%, Ti: 0.01-0.02%, rare earth: 0.03-0.04%, synthetic fiber: 0.1-0.8%, and the balance of Fe and unavoidable impurities;
the microstructure of the steel for the wind power gear box pin shaft is an austenite structure, the yield strength is 850-880 MPa, the tensile strength is 900-950 MPa, and the elongation is 12-16%.
Preferably, the steel comprises the following chemical components in percentage by weight: c: 0.06%, Si: 0.3%, Mn: 0.45%, P: 0.02%, S: 0.007%, Cr: 1.0%, Mo: 1.0%, Ni: 0.4%, Nb: 0.02%, Ti: 0.015%, rare earth: 0.035%, synthetic fibers: 0.5 percent.
Preferably, the synthetic fibers are carbon fibers.
Preferably, the weight percentage of the unavoidable impurities is less than or equal to 0.03 percent.
A preparation method of steel for a pin shaft of a wind power gear box comprises the following steps:
s1, continuous casting: smelting, refining and pouring according to set components to prepare a continuous casting blank, adopting electromagnetic stirring and constant-temperature constant-speed steel drawing in the continuous casting process to ensure the internal quality and the surface quality of the casting blank, producing a continuous casting small square blank with the section of 180 x 180mm, and carrying out heap cooling;
s2, heating a casting blank: heating the continuously cast bloom after the stack cooling to 1250-1320 ℃, and preserving heat for 40-80 min;
s3, hot rolling: rough rolling is carried out on an altitude, and the initial rolling temperature is 1100-1300 ℃; performing finish rolling on an altitude, controlling the temperature of a finish rolling inlet to be 1100-1300 ℃, controlling the reduction diameter temperature to be 1100-1300 ℃, controlling the cumulative reduction rate of finish rolling to be more than 70%, and performing wire laying at the temperature of 800-840 ℃ to obtain a hot rolled wire rod;
s4, cold rolling: the hot-rolled wire rod is subjected to 8-12 cold rolling passes, the average elongation coefficient of a single pass is 1.15-1.20, and the total elongation coefficient is 1.8-2.3;
s5, tempering: and tempering, heating to 600-700 ℃, and preserving heat for 40-50 min to obtain the steel for the pin shaft of the wind power gear box.
Preferably, in S3, the wire rod is hot-rolled by a high-speed wire rod mill.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the carbon fiber is added in the chemical components of the steel, and the steel has certain flexibility after being prepared by the preparation method, so that the steel is more suitable for manufacturing the flexible pin shaft of the wind power gear box, thereby enhancing the floating space of the planet wheel in the wind power gear box, improving the flexibility of the transmission system of the wind power gear box, and reducing the phenomena that the planet carrier in the transmission system can be twisted and eccentric to a certain extent.
Drawings
FIG. 1 is a schematic flow chart of the preparation method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a technical scheme that: the steel for the pin shaft of the wind power gear box comprises the following chemical components in percentage by weight: c: 0.05-0.08%, Si: 0.2-0.4%, Mn: 0.4-0.5%, P: 0.01-0.03%, S: 0.005-0.009%, Cr: 0.9-1.3%, Mo: 0.9-1.2%, Ni: 0.3-0.6%, Nb: 0.01 to 0.04%, Ti: 0.01-0.02%, rare earth: 0.03-0.04%, synthetic fiber: 0.1-0.8%, and the balance of Fe and unavoidable impurities;
the microstructure of the steel for the wind power gear box pin shaft is an austenite structure, the yield strength is 850-880 MPa, the tensile strength is 900-950 MPa, and the elongation is 12-16%.
In the invention, the chemical components of the steel are preferably as follows by weight percentage: c: 0.06-0.07%, Si: 0.25 to 0.35%, Mn: 0.42-0.48%, P: 0.015 to 0.025%, S: 0.006-0.008%, Cr: 1.0-1.2%, Mo: 1.0-1.1%, Ni: 0.4 to 0.5%, Nb: 0.02-0.03%, Ti: 0.012-0.018%, rare earth: 0.032-0.038%, synthetic fiber: 0.2 to 0.6 percent. The yield strength is preferably 855-875 MPa, the tensile strength is preferably 910-940 MPa, and the elongation is preferably 13-15%; the synthetic fibers are distributed in the steel along the length direction, so that the steel has certain flexibility and the rigidity and the strength of the steel accord with the national standard.
The steel comprises the following chemical components in percentage by weight: c: 0.06%, Si: 0.3%, Mn: 0.45%, P: 0.02%, S: 0.007%, Cr: 1.0%, Mo: 1.0%, Ni: 0.4%, Nb: 0.02%, Ti: 0.015%, rare earth: 0.035%, synthetic fibers: 0.5 percent.
In the invention, Si is added as a reducing agent and a deoxidizing agent in the steel-making process, the Si can obviously improve the elastic limit, yield point and tensile strength of steel, the weight percentage of Si in the invention is improved by 0.3%, and the elastic limit of steel is further improved.
The synthetic fibers are carbon fibers.
In the invention, the carbon fiber is high-strength high-modulus fiber with carbon content of more than 90 percent, has better high temperature resistance, and is prepared by taking acrylic fiber and viscose fiber as raw materials and oxidizing and carbonizing at high temperature.
The weight percentage of the inevitable impurities is less than or equal to 0.03 percent.
In the present invention, the smaller the weight percentage of the unavoidable impurities, the better, and the proportion of the unavoidable impurities is related to the purity of the steel, and it is necessary to control the weight percentage of the unavoidable impurities to 0.03% or less.
A preparation method of steel for a pin shaft of a wind power gear box comprises the following steps:
s1, continuous casting: smelting, refining and pouring according to set components to prepare a continuous casting blank, adopting electromagnetic stirring and constant-temperature constant-speed steel drawing in the continuous casting process to ensure the internal quality and the surface quality of the casting blank, producing a continuous casting small square blank with the section of 180 x 180mm, and carrying out heap cooling;
s2, heating a casting blank: heating the continuously cast bloom after the stack cooling to 1250-1320 ℃, and preserving heat for 40-80 min;
s3, hot rolling: rough rolling is carried out on an altitude, and the initial rolling temperature is 1100-1300 ℃; performing finish rolling on an altitude, controlling the temperature of a finish rolling inlet to be 1100-1300 ℃, controlling the reduction diameter temperature to be 1100-1300 ℃, controlling the cumulative reduction rate of finish rolling to be more than 70%, and performing wire laying at the temperature of 800-840 ℃ to obtain a hot rolled wire rod;
s4, cold rolling: the hot-rolled wire rod is subjected to 8-12 cold rolling passes, the average elongation coefficient of a single pass is 1.15-1.20, and the total elongation coefficient is 1.8-2.3;
s5, tempering: and tempering, heating to 600-700 ℃, and preserving heat for 40-50 min to obtain the steel for the pin shaft of the wind power gear box.
In the present invention, continuous casting: the chemical components by weight percentage are as follows: c: 0.05-0.08%, Si: 0.2-0.4%, Mn: 0.4-0.5%, P: 0.01-0.03%, S: 0.005-0.009%, Cr: 0.9-1.3%, Mo: 0.9-1.2%, Ni: 0.3-0.6%, Nb: 0.01 to 0.04%, Ti: 0.01-0.02%, rare earth: 0.03-0.04%, synthetic fiber: 0.1-0.8 percent of Fe and inevitable impurities for smelting, refining and pouring to prepare a continuous casting billet, wherein electromagnetic stirring and constant-temperature constant-speed steel drawing are adopted in the continuous casting process to ensure the internal quality and the surface quality of the casting billet, and a continuous casting small square billet with the section of 180 x 180mm is produced and is subjected to stack cooling; heating a casting blank: and heating the continuously cast slab subjected to the stack cooling to 1250 ℃, and preserving the heat for 400 min. Hot rolling: rough rolling is carried out on a high speed wire, and the initial rolling temperature is 1100 ℃; performing finish rolling on a high-speed wire, controlling the inlet temperature of the finish rolling to be 1100 ℃, controlling the reduction diameter temperature to be 1100-1300 ℃, controlling the cumulative reduction rate of finish rolling to be more than 70%, and performing wire laying at the temperature of 800 ℃ to obtain a hot-rolled wire rod; cold rolling: the hot-rolled wire rod is subjected to 9-pass cold rolling, the average elongation coefficient of a single pass is 1.15, and the total elongation coefficient is 1.8; tempering: and tempering, heating to 600 ℃, and preserving heat for 40min to obtain the steel for the pin shaft of the wind power gear box. The yield strength, the tensile strength and the elongation of the obtained wind power gear box pin shaft steel are tested, and the prepared steel is found to have the yield strength of 850-880 MPa, the tensile strength of 900-950 MPa and the elongation of 12-16%.
In the step S3, the wire rod is hot-rolled by a high-speed wire rod mill.
In the present invention, the high-speed wire rod mill rolls the billet into a finished product, the total elongation coefficient is large, and the rough rolling and the finish rolling in S3 can be completed.
In order to further illustrate the present invention, the following will describe in detail a steel for a pin shaft of a wind turbine gearbox and a method for manufacturing the same, which are provided by the present invention, with reference to the following examples, but should not be construed as limiting the scope of the present invention.
Example 1
The steel for the pin shaft of the wind power gear box comprises the following chemical components in percentage by weight: c: 0.05%, Si: 0.2%, Mn: 0.4%, P: 0.01%, S: 0.005%, Cr: 0.9%, Mo: 0.9%, Ni: 0.3%, Nb: 0.01%, Ti: 0.01%, rare earth: 0.03%, synthetic fiber: 0.1%, the balance being Fe and unavoidable impurities;
the microstructure of the steel for the pin shaft of the wind power gear box is an austenite structure, the yield strength is 850MPa, the tensile strength is 900MPa, and the elongation is 12%.
A preparation method of steel for a pin shaft of a wind power gear box comprises the following steps:
s1, continuous casting: smelting, refining and pouring according to set components to prepare a continuous casting blank, adopting electromagnetic stirring and constant-temperature constant-speed steel drawing in the continuous casting process to ensure the internal quality and the surface quality of the casting blank, producing a continuous casting small square blank with the section of 180 x 180mm, and carrying out heap cooling;
s2, heating a casting blank: heating the continuously cast bloom after the stack cooling to 1250 ℃, and preserving heat for 40 min;
s3, hot rolling: rough rolling is carried out on a high speed wire, and the initial rolling temperature is 1100 ℃; performing finish rolling on a high-speed wire, controlling the inlet temperature of the finish rolling to be 1100 ℃, controlling the reducing diameter temperature to be 1100 ℃, controlling the cumulative reduction rate of the finish rolling to be 72%, and performing wire laying at the temperature of 800 ℃ to obtain a hot-rolled wire rod;
s4, cold rolling: the hot rolled wire rod is subjected to 8-pass cold rolling, the average elongation coefficient of a single pass is 1.15, and the total elongation coefficient is 1.8;
s5, tempering: and tempering, heating to 600 ℃, and preserving heat for 40min to obtain the steel for the pin shaft of the wind power gear box.
Example 2
The steel for the pin shaft of the wind power gear box comprises the following chemical components in percentage by weight: c: 0.06%, Si: 0.3%, Mn: 0.45%, P: 0.02%, S: 0.006%, Cr: 1.0%, Mo: 1.0%, Ni: 0.4%, Nb: 0.02%, Ti: 0.015%, rare earth: 0.035%, synthetic fibers: 0.3%, the balance being Fe and unavoidable impurities;
the microstructure of the steel for the pin shaft of the wind power gear box is an austenite structure, the yield strength is 865MPa, the tensile strength is 920MPa, and the elongation is 14%.
A preparation method of steel for a pin shaft of a wind power gear box comprises the following steps:
s1, continuous casting: smelting, refining and pouring according to set components to prepare a continuous casting blank, adopting electromagnetic stirring and constant-temperature constant-speed steel drawing in the continuous casting process to ensure the internal quality and the surface quality of the casting blank, producing a continuous casting small square blank with the section of 180 x 180mm, and carrying out heap cooling;
s2, heating a casting blank: heating the continuously cast bloom after the stack cooling to 1300 ℃, and preserving the heat for 60 min;
s3, hot rolling: rough rolling is carried out on a high speed wire, and the initial rolling temperature is 1200 ℃; performing finish rolling on a high-speed wire, controlling the inlet temperature of the finish rolling to be 1200 ℃, controlling the reduction diameter temperature to be 1200 ℃, controlling the cumulative reduction rate of the finish rolling to be 75%, and performing wire laying at the temperature of 820 ℃ to obtain a hot-rolled wire rod;
s4, cold rolling: the hot-rolled wire rod is subjected to cold rolling of 10 passes, the average elongation coefficient of a single pass is 1.18, and the total elongation coefficient is 2.0;
s5, tempering: and tempering, heating to 650 ℃, and keeping the temperature for 45min to obtain the steel for the pin shaft of the wind power gear box.
Example 3
The steel for the pin shaft of the wind power gear box comprises the following chemical components in percentage by weight: c: 0.08%, Si: 0.4%, Mn: 0.5%, P: 0.03%, S: 0.009%, Cr: 1.3%, Mo: 1.2%, Ni: 0.6%, Nb: 0.04%, Ti: 0.02%, rare earth: 0.04%, synthetic fiber: 0.8%, the balance being Fe and unavoidable impurities;
the microstructure of the steel for the pin shaft of the wind power gear box is an austenite structure, the yield strength is 880MPa, the tensile strength is 950MPa, and the elongation is 16%.
A preparation method of steel for a pin shaft of a wind power gear box comprises the following steps:
s1, continuous casting: smelting, refining and pouring according to set components to prepare a continuous casting blank, adopting electromagnetic stirring and constant-temperature constant-speed steel drawing in the continuous casting process to ensure the internal quality and the surface quality of the casting blank, producing a continuous casting small square blank with the section of 180 x 180mm, and carrying out heap cooling;
s2, heating a casting blank: heating the continuously cast slab subjected to the stack cooling to 1320 ℃, and preserving the heat for 80 min;
s3, hot rolling: rough rolling is carried out on a high speed wire, and the initial rolling temperature is 1300 ℃; performing finish rolling on a high-speed wire, controlling the inlet temperature of the finish rolling to be 1300 ℃, controlling the reducing diameter temperature to be 1300 ℃, controlling the cumulative reduction rate of the finish rolling to be 80%, and performing wire laying at the temperature of 840 ℃ to obtain a hot-rolled wire rod;
s4, cold rolling: the hot-rolled wire rod is subjected to 12-pass cold rolling, the average elongation coefficient of a single pass is 1.20, and the total elongation coefficient is 2.3;
s5, tempering: and tempering, heating to 700 ℃, and preserving heat for 50min to obtain the steel for the pin shaft of the wind power gear box.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The steel for the pin shaft of the wind power gear box is characterized by comprising the following chemical components in percentage by weight: c: 0.05-0.08%, Si: 0.2-0.4%, Mn: 0.4-0.5%, P: 0.01-0.03%, S: 0.005-0.009%, Cr: 0.9-1.3%, Mo: 0.9-1.2%, Ni: 0.3-0.6%, Nb: 0.01 to 0.04%, Ti: 0.01-0.02%, rare earth: 0.03-0.04%, synthetic fiber: 0.1-0.8%, and the balance of Fe and unavoidable impurities;
the microstructure of the steel for the wind power gear box pin shaft is an austenite structure, the yield strength is 850-880 MPa, the tensile strength is 900-950 MPa, and the elongation is 12-16%.
2. The steel for the pin shaft of the wind power gear box according to claim 1, wherein the steel comprises the following chemical components in percentage by weight: c: 0.06%, Si: 0.3%, Mn: 0.45%, P: 0.02%, S: 0.007%, Cr: 1.0%, Mo: 1.0%, Ni: 0.4%, Nb: 0.02%, Ti: 0.015%, rare earth: 0.035%, synthetic fibers: 0.5 percent.
3. The steel for a wind gear box pin shaft according to claim 1 or 2, wherein the synthetic fiber is a carbon fiber.
4. The steel for a wind gear box pin shaft according to claim 1, wherein the weight percentage of the unavoidable impurities is not more than 0.03%.
5. The preparation method of the steel for the pin shaft of the wind power gear box is characterized by comprising the following steps of:
s1, continuous casting: smelting, refining and pouring according to set components to prepare a continuous casting blank, adopting electromagnetic stirring and constant-temperature constant-speed steel drawing in the continuous casting process to ensure the internal quality and the surface quality of the casting blank, producing a continuous casting small square blank with the section of 180 x 180mm, and carrying out heap cooling;
s2, heating a casting blank: heating the continuously cast bloom after the stack cooling to 1250-1320 ℃, and preserving heat for 40-80 min;
s3, hot rolling: rough rolling is carried out on an altitude, and the initial rolling temperature is 1100-1300 ℃; performing finish rolling on an altitude, controlling the temperature of a finish rolling inlet to be 1100-1300 ℃, controlling the reduction diameter temperature to be 1100-1300 ℃, controlling the cumulative reduction rate of finish rolling to be more than 70%, and performing wire laying at the temperature of 800-840 ℃ to obtain a hot rolled wire rod;
s4, cold rolling: the hot-rolled wire rod is subjected to 8-12 cold rolling passes, the average elongation coefficient of a single pass is 1.15-1.20, and the total elongation coefficient is 1.8-2.3;
s5, tempering: and tempering, heating to 600-700 ℃, and preserving heat for 40-50 min to obtain the steel for the pin shaft of the wind power gear box.
6. The method for preparing a steel for a pin shaft of a wind gear box according to claim 5, wherein in S3, a high-speed wire rod mill is used for hot rolling into a wire rod.
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Application publication date: 20210226 |