CN113528961B - Continuous casting round billet for wind power yaw bearing and preparation method thereof - Google Patents
Continuous casting round billet for wind power yaw bearing and preparation method thereof Download PDFInfo
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- CN113528961B CN113528961B CN202110799004.0A CN202110799004A CN113528961B CN 113528961 B CN113528961 B CN 113528961B CN 202110799004 A CN202110799004 A CN 202110799004A CN 113528961 B CN113528961 B CN 113528961B
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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
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- 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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Abstract
The invention provides a continuous casting round billet for a wind power yaw bearing and a preparation method thereof, wherein the continuous casting round billet for the wind power yaw bearing comprises the following chemical elements in percentage by mass: 0.41 to 0.45 percent of C, 0.20 to 0.37 percent of Si, 0.80 to 0.90 percent of Mn, 1.05 to 1.20 percent of Cr, 0.20 to 0.30 percent of Mo, 0.10 to 0.25 percent of Ni, less than or equal to 0.012 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.0025 percent of Ti, less than or equal to 0.001 percent of Ca, and the balance of Fe; the preparation method comprises the steps of pretreatment, converter smelting, refining, vacuum degassing, continuous casting, slow cooling and finishing in sequence. The preparation method provided by the invention improves the impact energy and stability of the continuous casting round billet in a low-temperature environment, prolongs the service life of the bearing, and reduces the replacement frequency and the maintenance cost.
Description
Technical Field
The invention belongs to the technical field of steel making, relates to a continuous casting round billet, and particularly relates to a continuous casting round billet for a wind power yaw bearing and a preparation method thereof.
Background
The bearing for the wind power generator can be roughly classified into three types, that is: yaw bearing, pitch bearing, drive train bearing (main shaft and gearbox bearing). The wind power yaw bearing is arranged at the connecting position of the tower and the cabin, and needs to bear larger axial impact during working, meanwhile, the design life of the wind driven generator is generally 20 years, and the fatigue life of the wind power generator bearing is required to be 20 years. The impact energy is used as an important index for the inspection of the wind power bearing forge piece, and the service life of a final product is directly influenced by the height and the stability of the impact energy. In addition, the bearing for the wind driven generator has a severe use environment, and is required to normally work at a low temperature of-40 ℃, so that the wind power yaw bearing is required to bear a large impact load at a low temperature. Therefore, the improvement of the low-temperature impact energy of the wind power yaw bearing has important significance.
According to the conventional continuous casting round billet for the wind power yaw bearing, due to the restriction of components and the segregation of the internal components of the continuous casting round billet, after normal forging and heat treatment, the average value of impact energy at the temperature of-40 ℃ is basically controlled to be 50-70J, the minimum impact energy at individual points is about 30J, the integral impact energy difference of the cross section of a forging piece is large, and the normal use requirement cannot be met.
Therefore, how to provide the continuous casting round billet for the wind power yaw bearing and the preparation method thereof can improve the impact energy and the stability thereof in a low-temperature environment, prolong the service life of the bearing, reduce the replacement frequency and the maintenance cost, and become the problem which needs to be solved urgently by technical personnel in the field at present.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a continuous casting round billet for a wind power yaw bearing and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a continuous casting round billet for a wind power yaw bearing, which comprises the following chemical elements in percentage by mass: 0.41 to 0.45 percent of C, 0.20 to 0.37 percent of Si, 0.80 to 0.90 percent of Mn, 1.05 to 1.2 percent of Cr, 0.20 to 0.30 percent of Mo, 0.10 to 0.25 percent of Ni, less than or equal to 0.012 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.0025 percent of Ti, less than or equal to 0.001 percent of Ca, and the balance of Fe.
The invention is researched and developed again from the aspect of improving the impact energy index by elements, the chemical components of the original steel grade are optimally designed, the content of C is properly reduced on the basis of the composition of the original steel grade, the content of Mn and Cr is improved, and a proper amount of Ni element is added, so that the low-temperature impact toughness is strengthened, and the obdurability is reasonably matched.
In the present invention, the percentage by mass of the element C is 0.41 to 0.45%, and may be, for example, 0.41%, 0.42%, 0.43%, 0.44%, or 0.45%, but is not limited to the values listed, and other values not listed in the numerical range are also applicable, and preferably 0.41 to 0.43%.
In the present invention, the content of Si element is 0.20 to 0.37% by mass, and may be, for example, 0.20%, 0.22%, 0.24%, 0.26%, 0.28%, 0.30%, 0.32%, 0.34%, 0.36% or 0.37%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned numerical range are also applicable, and preferably 0.28 to 0.32%.
In the present invention, the Mn element may be 0.80 to 0.90% by mass, for example, 0.80%, 0.81%, 0.82%, 0.83%, 0.84%, 0.85%, 0.86%, 0.87%, 0.88%, 0.89% or 0.90%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable, and preferably 0.84 to 0.87%.
In the present invention, the content of Cr element is 1.05 to 1.20% by mass, and may be, for example, 1.05%, 1.06%, 1.08%, 1.10%, 1.12%, 1.14%, 1.16%, 1.18% or 1.20%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable, and preferably 1.14 to 1.18%.
In the present invention, the content of Mo element is 0.20 to 0.30% by mass, and may be, for example, 0.20%, 0.21%, 0.22%, 0.23%, 0.24%, 0.25%, 0.26%, 0.27%, 0.28%, 0.29% or 0.30%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable, and preferably 0.22 to 0.24%.
In the present invention, the Ni element may be 0.10 to 0.25% by mass, for example, 0.10%, 0.12%, 0.14%, 0.16%, 0.18%, 0.20%, 0.22%, 0.24% or 0.25%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable, and preferably 0.15 to 0.17%.
According to the invention, the Ni element is introduced into the original steel and exists in the alpha phase or the gamma phase of the steel in a mutually soluble form with the Fe element, so that the strength of the steel is improved. After the alpha-phase grains are refined, the low-temperature performance, particularly the toughness of the steel can be improved, and the impact performance of the steel is further obviously improved. In addition, the content of the Ni element needs to be controlled within a reasonable range: when the mass percentage is less than 0.10%, the low-temperature impact energy improving effect of the steel is not obvious; when the mass percentage is higher than 0.25%, the iron scale is not easy to fall off, and further pits are formed on the surface of a rolled material in the subsequent rolling process, so that the service life of the bearing is influenced.
In the present invention, the content of the P element is 0.012% by mass or less, and may be, for example, 0.002%, 0.006%, 0.008%, 0.010%, or 0.012%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned numerical range are also applicable, and preferably 0.010% by mass or less.
In the present invention, the content of S element is 0.010% or less by mass, and may be, for example, 0.001%, 0.002%, 0.003%, 0.004%, 0.005%, 0.006%, 0.007%, 0.008%, 0.009%, or 0.010%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable, and preferably 0.003% or less.
In the present invention, the Ti element may be 0.0025% by mass or less, for example, 0.0005%, 0.0010%, 0.0015%, 0.0020% or 0.0025%, but is not limited to the listed values, and other values not listed in the numerical range are also applicable, and preferably 0.002% or less.
In the present invention, the content of Ca element is 0.001% by mass or less, and may be, for example, 0.0001%, 0.0002%, 0.0003%, 0.0004%, 0.0005%, 0.0006%, 0.0007%, 0.0008%, 0.0009% or 0.001%, but not limited to the above-mentioned values, and other values not specifically mentioned within the above-mentioned range are also applicable.
In a second aspect, the invention provides a method for preparing a continuous casting round billet for a wind power yaw bearing according to the first aspect, which comprises the following steps:
(1) pretreatment: stirring molten iron in a ladle by adopting a KR desulfurization method to form a vortex, adding a desulfurizing agent into the vortex for desulfurization reaction, and removing desulfurization products by repeatedly slagging off;
(2) smelting in a converter: smelting in a top-bottom combined blowing type alkaline converter, carrying out primary smelting by taking molten iron and scrap steel as raw materials, carrying out pre-deoxidation on the steel and carrying out primary component adjustment on the steel;
(3) refining: carrying out deep deoxidation and alloying of molten steel in an LF furnace, and carrying out reinforced desulfurization and impurity removal through steel slag reaction;
(4) continuous casting: adjusting the superheat degree of molten steel, performing electromagnetic stirring of a crystallizer under the conditions of a first current and a first frequency, performing tail end electromagnetic stirring under the conditions of a second current and a second frequency, and casting at a constant drawing speed to obtain a continuous casting round billet.
The invention controls the constant casting speed and the superheat degree interval of molten steel in the continuous casting link of the round billet, adjusts the electromagnetic stirring parameter of the crystallizer to improve the component segregation from the subcutaneous part of the continuous casting round billet to the edge of a columnar crystal, and adjusts the electromagnetic stirring parameter at the tail end to improve the segregation in an isometric crystal area, so that the extremely poor control (except a central point) of the carbon segregation of the cross section is less than or equal to 0.035%, the impact energy after normal forging and heat treatment is improved and stabilized, and the impact energy under the environment of-40 ℃ can reach 80-100J.
In the present invention, the desulfurizing agent used in the pretreatment is a conventional desulfurizing agent as long as it can realize a desulfurizing effect on molten iron, and thus, the specific type of the desulfurizing agent is not particularly limited, and for example, any one of limestone, sodium carbonate, and calcium carbide may be used.
In the present invention, the molten iron obtained after the pretreatment has an S content of 0.002 wt% or less, and may be, for example, 0.001 wt%, 0.0012 wt%, 0.0014 wt%, 0.0016 wt%, 0.0018 wt%, or 0.002 wt%, but is not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
Preferably, vacuum degassing is further included between the refining and the continuous casting.
Preferably, the vacuum degassing is performed in an RH circular degassing apparatus.
Preferably, the continuous casting is followed by slow cooling and finishing in sequence.
Preferably, the degree of superheat of the molten steel in the continuous casting is 18 to 22 ℃, and may be, for example, 18 ℃, 18.5 ℃, 19 ℃, 19.5 ℃, 20 ℃, 20.5 ℃, 21 ℃, 21.5 ℃ or 22 ℃, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the first current is 180-220A, such as 180A, 185A, 190A, 195A, 200A, 205A, 210A, 215A, or 220A, but is not limited to the recited values, and other values not recited within the range of values are equally applicable.
Preferably, the first frequency is 1-3Hz, and may be, for example, 1Hz, 1.2Hz, 1.4Hz, 1.6Hz, 1.8Hz, 2Hz, 2.2Hz, 2.4Hz, 2.6Hz, 2.8Hz or 3Hz, but is not limited to the values recited, and other values not recited within the range of values are equally applicable.
Preferably, the second current is 700-900A, and may be, for example, 700A, 720A, 740A, 760A, 780A, 800A, 820A, 840A, 860A, 880A or 900A, but is not limited to the values listed, and other values not listed in the range of values are equally applicable.
Preferably, the second frequency is 6-10Hz, and may be, for example, 6Hz, 6.5Hz, 7Hz, 7.5Hz, 8Hz, 8.5Hz, 9Hz, 9.5Hz, or 10Hz, but is not limited to the values listed, and other values not listed within the range of values are equally applicable.
Preferably, the constant draw rate is 0.21 to 0.28m/min, and may be, for example, 0.21m/min, 0.22m/min, 0.23m/min, 0.24m/min, 0.25m/min, 0.26m/min, 0.27m/min or 0.28m/min, but is not limited to the recited values, and other values not recited within the range of values are equally applicable.
As a preferable technical solution of the second aspect of the present invention, the preparation method comprises the steps of:
(1) pretreatment: stirring molten iron in a ladle by adopting a KR desulfurization method to form a vortex, adding a desulfurizing agent into the vortex to perform desulfurization reaction, and removing desulfurization products by repeatedly slagging off;
(2) smelting in a converter: smelting in a top-bottom combined blowing type alkaline converter, carrying out primary smelting by taking molten iron and scrap steel as raw materials, carrying out pre-deoxidation on the steel and carrying out primary component adjustment on the steel;
(3) refining: carrying out deep deoxidation and alloying of molten steel in an LF furnace, and carrying out reinforced desulfurization and impurity removal through steel slag reaction;
(4) continuous casting: adjusting the superheat degree of the molten steel to be 18-22 ℃, performing electromagnetic stirring in a crystallizer under the conditions of 180-220A and 1-3Hz, performing electromagnetic stirring at the tail end under the conditions of 700-900A and 6-10Hz, and casting at a constant drawing speed of 0.21-0.28m/min to obtain a continuous casting round billet.
Wherein, the refining and the continuous casting also comprise vacuum degassing in an RH circulation degassing device; the continuous casting is followed by sequential slow cooling and finishing.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the impact energy index is researched and developed again from the aspect of improving the impact energy index by elements, the chemical components of the original steel are optimally designed, the content of C is properly reduced on the basis of the composition of the original steel, the contents of Mn and Cr are improved, and a proper amount of Ni element is added, so that the low-temperature impact toughness is strengthened, and the obdurability is reasonably matched;
(2) the invention controls the constant casting speed and the superheat degree interval of molten steel in the continuous casting link of the round billet, adjusts the electromagnetic stirring parameter of the crystallizer to improve the component segregation from the subcutaneous part of the continuous casting round billet to the edge of a columnar crystal, and adjusts the electromagnetic stirring parameter at the tail end to improve the segregation in an isometric crystal area, so that the extremely poor control (except a central point) of the carbon segregation of the cross section is less than or equal to 0.035%, the impact energy after normal forging and heat treatment is improved and stabilized, and the impact energy under the environment of-40 ℃ can reach 80-100J.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments.
Example 1
The embodiment provides a continuous casting round billet for a wind power yaw bearing and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) pretreatment: stirring molten iron in a ladle by adopting a KR desulfurization method to form a vortex, adding limestone into the vortex to perform desulfurization reaction, and removing desulfurization products by repeatedly slagging off to ensure that the S content of the molten iron is less than or equal to 0.002 wt%;
(2) smelting in a converter: smelting in a top-bottom combined blowing type alkaline converter, carrying out primary smelting by taking molten iron and scrap steel as raw materials, carrying out pre-deoxidation on the steel and carrying out primary component adjustment on the steel;
(3) refining: carrying out deep deoxidation and alloying of molten steel in an LF furnace, and carrying out reinforced desulfurization and impurity removal through steel slag reaction;
(4) continuous casting: adjusting the superheat degree of molten steel to 20 ℃, performing crystallizer electromagnetic stirring under the conditions of 200A and 2Hz, performing tail end electromagnetic stirring under the conditions of 800A and 8Hz, and casting at a constant drawing speed of 0.24m/min to obtain a continuous casting round billet.
Wherein, the vacuum degassing in an RH circulation degassing device is also included between the refining and the continuous casting; the continuous casting is followed by sequential slow cooling and finishing.
The continuous casting round billet for the wind power yaw bearing obtained in the embodiment comprises the following chemical elements in percentage by mass: 0.42% of C, 0.30% of Si, 0.85% of Mn, 1.16% of Cr, 0.23% of Mo, 0.16% of Ni, 0.008% of P, 0.002% of S, 0.001% of Ti, 0.0008% of Ca and the balance of Fe.
As proved by inspection of the continuous casting round billet obtained in the embodiment by referring to GB/T22913.1, the impact energy of the wind power yaw bearing in an environment of-40 ℃ can reach 100J, and the carbon segregation range of the cross section is controlled (except for the central point) to be 0.02%.
Example 2
The embodiment provides a continuous casting round billet for a wind power yaw bearing and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) pretreatment: stirring molten iron in a ladle by a KR desulfurization method to form a vortex, adding sodium carbonate into the vortex to perform desulfurization reaction, and removing desulfurization products by repeatedly slagging off to ensure that the S content of the molten iron is less than or equal to 0.002 wt%;
(2) smelting in a converter: smelting in a top-bottom combined blowing type alkaline converter, carrying out primary smelting by taking molten iron and scrap steel as raw materials, carrying out pre-deoxidation on the steel and carrying out primary component adjustment on the steel;
(3) refining: carrying out deep deoxidation and alloying of molten steel in an LF furnace, and carrying out reinforced desulfurization and impurity removal through steel slag reaction;
(4) continuous casting: adjusting the superheat degree of molten steel to be 18 ℃, carrying out electromagnetic stirring of a crystallizer under the conditions of 180A and 1Hz, carrying out electromagnetic stirring of the tail end under the conditions of 700A and 6Hz, and carrying out casting at a constant drawing speed of 0.21m/min to obtain a continuous casting round billet.
Wherein, the vacuum degassing in an RH circulation degassing device is also included between the refining and the continuous casting; the continuous casting is followed by sequential slow cooling and finishing.
The continuous casting round billet for the wind power yaw bearing obtained in the embodiment comprises the following chemical elements in percentage by mass: 0.41% of C, 0.28% of Si, 0.84% of Mn, 1.14% of Cr, 0.22% of Mo, 0.15% of Ni, 0.01% of P, 0.003% of S, 0.002% of Ti, 0.001% of Ca and the balance of Fe.
As proved by examination of the continuous casting round billet obtained in the embodiment by referring to GB/T22913.1, the impact power of the wind power yaw bearing can reach 80J at the temperature of-40 ℃, and the carbon segregation range of the cross section is controlled (except for a central point) to be 0.03%.
Example 3
The embodiment provides a continuous casting round billet for a wind power yaw bearing and a preparation method thereof, wherein the preparation method comprises the following steps:
(1) pretreatment: stirring molten iron in a ladle by a KR desulfurization method to form a vortex, adding calcium carbide into the vortex to perform desulfurization reaction, and removing desulfurization products by repeatedly slagging off to ensure that the S content of the molten iron is less than or equal to 0.002 wt%;
(2) smelting in a converter: smelting in a top-bottom combined blowing type alkaline converter, carrying out primary smelting by taking molten iron and scrap steel as raw materials, carrying out pre-deoxidation on the steel and carrying out primary component adjustment on the steel;
(3) refining: carrying out deep deoxidation and alloying of molten steel in an LF furnace, and carrying out reinforced desulfurization and impurity removal through steel slag reaction;
(4) continuous casting: adjusting the superheat degree of molten steel to 22 ℃, performing crystallizer electromagnetic stirring under the conditions of 220A and 3Hz, performing tail end electromagnetic stirring under the conditions of 900A and 10Hz, and casting at a constant drawing speed of 0.28m/min to obtain a continuous casting round billet.
Wherein, the vacuum degassing in an RH circulation degassing device is also included between the refining and the continuous casting; the continuous casting is followed by sequential slow cooling and finishing.
The continuous casting round billet for the wind power yaw bearing obtained in the embodiment comprises the following chemical elements in percentage by mass: 0.43% of C, 0.32% of Si, 0.87% of Mn, 1.18% of Cr, 0.24% of Mo, 0.17% of Ni, 0.006% of P, 0.001% of S, 0.001% of Ti, 0.0006% of Ca and the balance of Fe.
As can be seen from the examination of the continuous casting round billet obtained in the embodiment by referring to GB/T22913.1, the impact energy of the wind power yaw bearing in an environment of-40 ℃ can reach 92J, and the control of the carbon segregation range of the cross section (excluding the central point) is 0.035%.
Example 4
The embodiment provides a continuous casting round billet for a wind power yaw bearing and a preparation method thereof, and the preparation method is the same as that of embodiment 1, and therefore details are not repeated here. The difference lies in that the chemical element composition of the obtained continuous casting round billet for the wind power yaw bearing is calculated by mass percent through regulating and controlling the raw material ratio: 0.41 percent of C, 0.20 percent of Si, 0.80 percent of Mn, 1.05 percent of Cr, 0.20 percent of Mo, 0.10 percent of Ni, 0.012 percent of P, 0.010 percent of S, 0.0025 percent of Ti, 0.001 percent of Ca and the balance of Fe.
As proved by inspection of the continuous casting round billet obtained in the embodiment by referring to GB/T22913.1, the impact energy of the wind power yaw bearing in an environment of-40 ℃ can reach 85J, and the carbon segregation range of the cross section is controlled (except for the central point) to be 0.035%.
Example 5
The embodiment provides a continuous casting round billet for a wind power yaw bearing and a preparation method thereof, and the preparation method is the same as that of embodiment 1, and therefore details are not repeated here. The difference lies in that the chemical element composition of the obtained continuous casting round billet for the wind power yaw bearing is calculated by mass percent through regulating and controlling the raw material ratio: 0.45% of C, 0.37% of Si, 0.90% of Mn, 1.20% of Cr, 0.30% of Mo, 0.25% of Ni, 0.006% of P, 0.001% of S, 0.001% of Ti, 0.0006% of Ca and the balance of Fe.
As can be seen from the examination of the continuous casting round billet obtained in the embodiment by referring to GB/T22913.1, the impact energy of the wind power yaw bearing in an environment of-40 ℃ can reach 80J, and the control of the carbon segregation range of the cross section (excluding the central point) is 0.035%.
Comparative example 1
The comparative example provides a continuous casting round billet for a wind power yaw bearing and a preparation method thereof, and the preparation method is the same as that of example 1, so that the details are not repeated. The difference lies in that the comparative example enables the chemical element composition of the obtained continuous casting round billet for the wind power yaw bearing to be calculated according to the mass percentage by regulating and controlling the raw material ratio: 0.42% of C, 0.30% of Si, 0.85% of Mn, 1.16% of Cr, 0.23% of Mo, 0.08% of Ni, 0.008% of P, 0.002% of S, 0.001% of Ti, 0.0008% of Ca and the balance of Fe.
According to the inspection of the continuous casting round billet obtained by the comparative example by referring to GB/T22913.1, the impact power of the wind power yaw bearing under the environment of-40 ℃ is 75J, and the control of the carbon segregation range of the cross section (excluding the central point) is 0.025 percent.
Comparative example 2
The comparative example provides a continuous casting round billet for a wind power yaw bearing and a preparation method thereof, and the preparation method is the same as that in example 1, so details are not repeated here. The difference lies in that the comparative example enables the chemical element composition of the continuous casting round billet for the wind power yaw bearing to be as follows by regulating and controlling the raw material proportion in percentage by mass: 0.42% of C, 0.30% of Si, 0.85% of Mn, 1.16% of Cr, 0.23% of Mo, 0.30% of Ni, 0.008% of P, 0.002% of S, 0.001% of Ti, 0.0008% of Ca and the balance of Fe.
As proved by inspection of the continuous casting round billet obtained by the comparative example by referring to GB/T22913.1, the impact power of the wind power yaw bearing in an environment of-40 ℃ is 90J, and the control of the carbon segregation range of the cross section (excluding the central point) is 0.04%.
Therefore, the invention is researched and developed again from the aspect of improving the impact energy index by elements, the chemical components of the original steel are optimally designed, the content of C is properly reduced on the basis of the composition of the original steel, the contents of Mn and Cr are improved, and a proper amount of Ni element is added, so that the low-temperature impact toughness is strengthened, and the obdurability is reasonably matched; in addition, the constant casting speed and the molten steel superheat degree interval of the casting are controlled in the round billet continuous casting link, the electromagnetic stirring parameters of the crystallizer are adjusted to improve the component segregation from the continuous casting round billet to the edge of a columnar crystal, the electromagnetic stirring parameters of the tail end are adjusted to improve the segregation of an isometric crystal area, the carbon segregation range of the cross section is controlled to be less than or equal to 0.035 percent (except a central point), the impact energy after normal forging and heat treatment is improved and stabilized, and the impact energy under the environment of minus 40 ℃ can reach 80 to 100J.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The continuous casting round billet for the wind power yaw bearing is characterized by comprising the following chemical elements in percentage by mass: 0.41 to 0.43 percent of C, 0.28 to 0.32 percent of Si, 0.84 to 0.87 percent of Mn0, 1.14 to 1.18 percent of Cr, 0.22 to 0.24 percent of Mo, 0.15 to 0.17 percent of Ni, less than or equal to 0.010 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.002 percent of Ti, less than or equal to 0.001 percent of Ca and the balance of Fe;
the carbon segregation range of the cross section of the continuous casting round billet for the wind power yaw bearing is controlled to be less than or equal to 0.035%, and the impact energy under the environment of-40 ℃ is 80-100J.
2. The preparation method of the continuous casting round billet for the wind power yaw bearing according to claim 1, characterized by comprising the following steps:
(1) pretreatment: stirring molten iron in a ladle by adopting a KR desulfurization method to form a vortex, adding a desulfurizing agent into the vortex to perform desulfurization reaction, and removing desulfurization products by repeatedly slagging off;
(2) smelting in a converter: smelting in a top-bottom combined blowing type alkaline converter, carrying out primary smelting by taking molten iron and scrap steel as raw materials, carrying out pre-deoxidation on the steel and carrying out primary component adjustment on the steel;
(3) refining: carrying out deep deoxidation and alloying of molten steel in an LF furnace, and carrying out reinforced desulfurization and impurity removal through steel slag reaction;
(4) continuous casting: adjusting the superheat degree of molten steel, performing electromagnetic stirring of a crystallizer under the conditions of a first current and a first frequency, performing tail end electromagnetic stirring under the conditions of a second current and a second frequency, and casting at a constant drawing speed to obtain a continuous casting round billet.
3. The method of claim 2, further comprising vacuum degassing between refining and continuous casting.
4. The production method according to claim 3, wherein the vacuum degassing is performed in an RH cycle degassing apparatus.
5. The method of claim 2, further comprising sequential slow cooling and finishing after the continuous casting.
6. The production method according to claim 2, wherein a superheat degree of the molten steel in the continuous casting is 18 to 22 ℃.
7. The method as claimed in claim 2, wherein the first current is 180-220A.
8. The method of claim 2, wherein the first frequency is 1-3 Hz.
9. The method as set forth in claim 2, wherein the second current is 700-900A.
10. The method of claim 2, wherein the second frequency is 6-10 Hz.
11. The method of claim 2, wherein the constant draw rate is 0.21 to 0.28 m/min.
12. The method of any one of claims 2 to 11, comprising the steps of:
(1) pretreatment: stirring molten iron in a ladle by adopting a KR desulfurization method to form a vortex, adding a desulfurizing agent into the vortex to perform desulfurization reaction, and removing desulfurization products by repeatedly slagging off;
(2) smelting in a converter: smelting in a top-bottom combined blowing type alkaline converter, carrying out primary smelting by taking molten iron and scrap steel as raw materials, and carrying out pre-deoxidation and component primary regulation on tapping;
(3) refining: carrying out deep deoxidation and alloying of molten steel in an LF furnace, and carrying out reinforced desulfurization and impurity removal through steel slag reaction;
(4) continuous casting: adjusting the superheat degree of the molten steel to be 18-22 ℃, performing electromagnetic stirring on a crystallizer under the conditions of 180-220A and 1-3Hz, performing electromagnetic stirring at the tail end under the conditions of 700-900A and 6-10Hz, and casting at a constant drawing speed of 0.21-0.28m/min to obtain a continuous casting round billet;
wherein, the vacuum degassing in an RH circulation degassing device is also included between the refining and the continuous casting; the continuous casting is followed by sequential slow cooling and finishing.
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