CN116695022A - High-strength and high-toughness gear round steel for wind power and preparation method thereof - Google Patents
High-strength and high-toughness gear round steel for wind power and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000009749 continuous casting Methods 0.000 claims abstract description 20
- 238000007670 refining Methods 0.000 claims abstract description 17
- 239000000956 alloy Substances 0.000 claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims description 29
- 238000010079 rubber tapping Methods 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000004321 preservation Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 10
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 238000005275 alloying Methods 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 150000002910 rare earth metals Chemical class 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 229910000851 Alloy steel Inorganic materials 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 26
- 208000029154 Narrow face Diseases 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
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- 229910052721 tungsten Inorganic materials 0.000 description 1
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Classifications
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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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- 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
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
-
- 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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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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- 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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The invention relates to high-strength and high-toughness gear round steel for wind power, which comprises the following alloy components in percentage by weight: 0.15 to 0.21 percent of C,0.17 to 0.40 percent of Si,0.50 to 0.90 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S,1.50 to 1.80 percent of Cr,1.40 to 1.70 percent of Ni,0.25 to 0.35 percent of Mo, less than or equal to 0.030 percent of Al, less than or equal to 0.015 percent of Cu, less than or equal to 0.002 percent of O, less than or equal to 0.01 percent of N, less than or equal to 0.00015 percent of H,0.015 to 0.03 percent of (La+Ce) and the balance of Fe. The preparation method is based on an electric furnace, LF, RH and continuous casting technology, and the technological parameters and technical nodes of primary smelting, refining, continuous casting and rolling are controlled through the addition of rare earth elements and the cooperation, so that the gear round steel for wind power with excellent mechanical properties and high strength and toughness is finally obtained. The tensile strength is 1130-1170 MPa, the yield strength is 900-940 MPa, the breaking elongation is 23-27%, the impact toughness is 240-260J, the high-end use requirement is met, and the breakthrough of mass production of the high-strength and high-toughness gear round steel for wind power in the electric furnace continuous casting process is realized.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, and particularly relates to high-strength and high-toughness gear round steel for wind power and a preparation method thereof.
Background
Along with the entering of China into a high-quality development stage, a green energy technology represented by wind power, photovoltaic and hydrogen energy has become an important development direction of an energy structure in the future of China. Due to the requirement and reasonable utilization of natural resources, the wind turbine generator is mainly distributed in mountainous areas, coasts and the like, the working environment of the wind turbine generator is bad, and the transmission gear in the wind turbine generator has higher service life and stability while bearing high load. Therefore, how to improve the purity, hardenability, contact fatigue resistance and bending fatigue strength of the steel for the wind power gear, and develop the high-quality gear steel for the wind power with high strength and toughness characteristics have important significance for the stable development of the wind power technology.
The current research on the quality control direction of the gear steel for wind power comprises a manufacturing method (application number is 202210495561.8) of the microalloyed wind power gearbox gear steel, and the method is to obtain the high-strength and high-toughness gear steel for wind power by controlling steelmaking chemical components and process technological parameters. A gear steel for wind power and a preparation method thereof (application number is 201710255727.8) are provided, which realizes the effects of high temperature resistance, corrosion resistance and grain refinement of the gear steel by adding elements tungsten and hafnium. A high-strength high-toughness steel for wind power gear box and its production process (202210578063. X) features that the chemical components are regulated to obtain high-toughness steel for wind power gear box and the impact performance at-40 deg.C is emphasized.
The research method adopted in the aspect of controlling the toughness of the gear steel for wind power is mainly focused on the design of alloy chemical components, but no rare earth element addition is involved. Therefore, the control of the toughness performance of the steel is realized by adding trace rare earth elements and matching with the control of technological parameters, so that the gear round steel for wind power with excellent mechanical properties and high toughness is prepared, and the gear round steel has great economic value and wide market prospect.
Disclosure of Invention
In order to solve the technical problems, the invention provides the high-strength and high-toughness gear round steel for wind power and the preparation method thereof, and the method is characterized in that on the basis of an electric furnace +LF +RH +continuous casting process, the technological parameters and technical nodes of primary smelting, refining, continuous casting and rolling are controlled through the addition of rare earth elements and the cooperation of rare earth elements, and finally the gear round steel for wind power with excellent mechanical properties and high strength and toughness characteristics is obtained. The tensile strength is 1130-1170 MPa, the yield strength is 900-940 MPa, the breaking elongation is 23-27%, the impact toughness is 240-260J, the high-end use requirement is met, and the breakthrough of mass production of the high-strength and high-toughness gear round steel for wind power in the electric furnace continuous casting process is realized.
The specific invention comprises the following steps:
the high-strength and high-toughness gear round steel for wind power comprises the following alloy components in percentage by weight: 0.15 to 0.21 percent of C,0.17 to 0.40 percent of Si,0.50 to 0.90 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S,1.50 to 1.80 percent of Cr,1.40 to 1.70 percent of Ni,0.25 to 0.35 percent of Mo, less than or equal to 0.030 percent of Al, less than or equal to 0.015 percent of Cu, less than or equal to 0.002 percent of O, less than or equal to 0.01 percent of N, less than or equal to 0.00015 percent of H,0.015 to 0.03 percent of (La+Ce) and the balance of Fe.
Preferably, the La: ce=2 to 3:1, the Al: n=2 to 4:1.
preferably, the tensile strength of the gear round steel is 1130-1170 MPa, the yield strength is 900-940 MPa, the elongation at break is 23-27%, and the impact toughness is 240-260J.
Another object of the present invention is to provide a method for preparing high strength and toughness gear round steel for wind power, the method comprising the steps of electric furnace smelting, LF furnace refining, RH refining, continuous casting and rolling, wherein the electric furnace smelting is: the tapping temperature is 1620-1630 ℃, the end point steel is 0.05-0.10% C, less than or equal to 0.010% P; and (3) pre-deoxidizing and alloying tapping, supplementing Mn, cr, ni, mo alloy according to the target value of alloy components, adding carburant in the tapping process, and tapping 800kg of lime, wherein the weight of aluminum wire is 1.5 kg/t.
Further, the LF refining process comprises the following steps: the white slag time is more than or equal to 30min, and 50kg of silicon carbide (SiC is more than or equal to 85%), carbon powder and Al particles are adopted for diffusion deoxidation; the Al content is controlled to be 0.020-0.040% when leaving the station, and the temperature is 1632-1642 ℃.
Further, the RH refining process comprises the following steps: the holding time is more than or equal to 12min under the vacuum degree of 100Pa, the silicon-calcium wire and the rare earth wire are fed after the vacuum is broken, and the wire feeding speed is more than or equal to 150m/min; the static blowing time is more than 15min.
Further, the continuous casting process comprises the following steps:
baking the tundish: three-section heating, firstly, adopting small fire with flame length of 300mm, and keeping the temperature at 300+/-5 ℃ for 40-60 min; then adopting medium fire, keeping the flame length at 1100+/-5 ℃ for 30-60 min, wherein the flame length is 500 mm; finally, using big fire with flame length of 700mm, and keeping the temperature at 1100+/-5 ℃ for 180-210 min;
continuous casting drawing speed and molten steel superheat degree control: calculating liquidus temperature of corresponding alloy components, controlling the superheat degree of molten steel at 20-35 ℃, selecting 480mm of casting blank section, and keeping constant pulling speed in the production process, wherein the pulling speed is 0.45-0.47 m/min;
vibration parameters of the crystallizer: adopting a non-sinusoidal vibration mode, wherein C1:5.0, C2:0.0, C3:80.0, C4:25.0, C5:0.0 and C6:0.55;
controlling the water quantity of a crystallizer: broad surface 95-105 m 3 And/h, the narrow surface is 80-90 m 3 /h；
Controlling the specific water quantity of the secondary cooling water: the total water quantity is 135-145L/min, and the specific water quantity is 0.2-0.25L/kg;
controlling electromagnetic stirring parameters of a crystallizer: 280-300A, 1.5-2.5 Hz;
and (3) controlling stirring parameters of a battery at the tail end of a casting blank: 480 to 520A,5 to 7Hz;
stirring mode: alternating stirring (10 s-3s-10 s);
casting blank reduction parameter control: the rolling is carried out for 5 times, the rolling reduction is respectively 1mm, 2mm, 3mm, 5mm and 1mm, and the total rolling reduction is 12mm;
and (3) controlling heat preservation parameters of casting blanks: the casting blank off-line temperature is 550-700 ℃, the heat preservation time is more than or equal to 36h, and the casting blank pit outlet temperature is less than or equal to 200 ℃.
Further, the rolling process comprises the following steps: the temperature of the soaking section is 1180-1200 ℃, and the heating time is 350-420 min; the rolling temperature is ensured to be more than or equal to 1100 ℃, and the finishing temperature is ensured to be more than or equal to 850 ℃; the pit entering temperature of the pricked material is more than or equal to 550 ℃, the pit exiting temperature is less than or equal to 200 ℃, and the heat preservation time is more than or equal to 45 hours.
The preparation method of the high-strength and high-toughness gear round steel for wind power is only limited on key parameters in the preparation process, and other conventional steps for preparing steel are carried out in a mode disclosed by the prior art, so that the process requirements are met.
The beneficial effects of the invention are as follows:
(1) according to the method, based on an electric furnace, LF, RH and continuous casting technology, technological parameters and technical nodes of primary smelting, refining, continuous casting and rolling are controlled through addition of rare earth elements in a matching mode, the tensile strength of the gear round steel for wind power is 1130-1170 MPa, the yield strength is 900-940 MPa, the elongation at break is 23-27%, and the impact toughness is 240-260J, so that the requirements of high-end products are met.
(2) Reasonable component design and production process ensure the surface quality and mechanical property.
Detailed Description
The following non-limiting examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way.
The test methods described in the following examples, unless otherwise specified, are all conventional; the reagents and materials, unless otherwise specified, are commercially available.
Example 1
The technical scheme of the invention is adopted to prepare the gear round steel for wind power, and the specific steps are as follows:
smelting in an electric furnace: the tapping temperature is 1620 ℃, the end point steel is 0.05 percent C and less than or equal to 0.010 percent P; and (3) pre-deoxidizing and alloying tapping, supplementing Mn, cr, ni, mo alloy according to the target value of alloy components, adding carburant in the tapping process, and tapping 800kg of lime, wherein the weight of aluminum wire is 1.5 kg/t.
LF refining: the white slag time is more than or equal to 30min, and 50kg of silicon carbide (SiC is more than or equal to 85%), carbon powder and Al particles are adopted for diffusion deoxidation; the Al content was controlled at 0.020% and the temperature at 1632℃at the time of departure.
RH refining: the holding time is more than or equal to 12min under the vacuum degree of 100Pa, the silicon-calcium wire and the rare earth wire are fed after the vacuum is broken, and the wire feeding speed is more than or equal to 150m/min; the static blowing time is more than 15min.
Continuous casting: baking the tundish: three-section heating, firstly adopting small fire with flame length of 300mm, and keeping at 300+/-5 ℃ for 40min; then adopting medium fire, keeping the flame length at 500mm and 1100+/-5 ℃ for 30min; finally, using big fire with flame length of 700mm, and keeping at 1100+/-5 ℃ for 180min;
continuous casting drawing speed and molten steel superheat degree control: calculating liquidus temperature of corresponding alloy components, controlling the superheat degree of molten steel at 20 ℃, selecting 480mm of casting blank section, and maintaining constant pulling speed in the production process, wherein the pulling speed is 0.45 m/min;
vibration parameters of the crystallizer: adopting a non-sinusoidal vibration mode, wherein C1:5.0, C2:0.0, C3:80.0, C4:25.0, C5:0.0 and C6:0.55;
controlling the water quantity of a crystallizer: broad surface 95m 3 /h, narrow face 80m 3 /h；
Controlling the specific water quantity of the secondary cooling water: the total water quantity is 135L/min, and the specific water quantity is 0.2L/kg;
controlling electromagnetic stirring parameters of a crystallizer: 280A,1.5Hz;
and (3) controlling stirring parameters of a battery at the tail end of a casting blank: 480A,5Hz;
stirring mode: alternating stirring (10 s-3s-10 s);
casting blank reduction parameter control: the rolling is carried out for 5 times, the rolling reduction is respectively 1mm, 2mm, 3mm, 5mm and 1mm, and the total rolling reduction is 12mm;
and (3) controlling heat preservation parameters of casting blanks: the casting blank off-line temperature is 550 ℃, the heat preservation time is more than or equal to 36h, and the casting blank pit outlet temperature is less than or equal to 200 ℃.
Rolling: the soaking section temperature is 1180 ℃, and the heating time is 350min; the rolling temperature is ensured to be more than or equal to 1100 ℃, and the finishing temperature is ensured to be more than or equal to 850 ℃; the pit entering temperature of the pricked material is more than or equal to 550 ℃, the pit exiting temperature is less than or equal to 200 ℃, and the heat preservation time is more than or equal to 45 hours.
Through detection, the prepared gear round steel for wind power comprises the following alloy components: 0.17% C,0.20% Si,0.60% Mn,0.024% P,0.023% S,1.55% Cr,1.50% Ni,0.26% Mo,0.028% Al,0.014% Cu,0.002% O,0.01% N,0.00014% H,0.017% (La+Ce), the balance being Fe; tensile strength 1135MPa, yield strength 918MPa, elongation at break 24% and impact toughness 245J.
Example 2
The technical scheme of the invention is adopted to prepare the gear round steel for wind power, and the specific steps are as follows:
smelting in an electric furnace: the tapping temperature is 1625 ℃, the end point steel is 0.075 percent C and less than or equal to 0.010 percent P; and (3) pre-deoxidizing and alloying tapping, supplementing Mn, cr, ni, mo alloy according to the target value of alloy components, adding carburant in the tapping process, and tapping 800kg of lime, wherein the weight of aluminum wire is 1.5 kg/t.
LF refining: the white slag time is more than or equal to 30min, and 50kg of silicon carbide (SiC is more than or equal to 85%), carbon powder and Al particles are adopted for diffusion deoxidation; the Al content was controlled at 0.030% at 1637℃at the time of departure.
RH refining: the holding time is more than or equal to 12min under the vacuum degree of 100Pa, the silicon-calcium wire and the rare earth wire are fed after the vacuum is broken, and the wire feeding speed is more than or equal to 150m/min; the static blowing time is more than 15min.
Continuous casting: baking the tundish: three-stage heating, firstly adopting small fire with flame length of 300mm, and keeping at 300+/-5 ℃ for 50min; then adopting medium fire, keeping the flame length at 500mm and 1100+/-5 ℃ for 45min; finally, using big fire with flame length of 700mm, and keeping at 1100+/-5 ℃ for 200min;
continuous casting drawing speed and molten steel superheat degree control: calculating liquidus temperature of corresponding alloy components, controlling the superheat degree of molten steel at 30 ℃, selecting 480mm of casting blank section, and maintaining constant pulling speed in the production process, wherein the pulling speed is 0.46 m/min;
vibration parameters of the crystallizer: adopting a non-sinusoidal vibration mode, wherein C1:5.0, C2:0.0, C3:80.0, C4:25.0, C5:0.0 and C6:0.55;
controlling the water quantity of a crystallizer: broad surface 100m 3 /h, narrow face 85m 3 /h；
Controlling the specific water quantity of the secondary cooling water: the total water quantity is 140L/min, and the specific water quantity is 0.22L/kg;
controlling electromagnetic stirring parameters of a crystallizer: 290A,2Hz;
and (3) controlling stirring parameters of a battery at the tail end of a casting blank: 500A,6Hz;
stirring mode: alternating stirring (10 s-3s-10 s);
casting blank reduction parameter control: the rolling is carried out for 5 times, the rolling reduction is respectively 1mm, 2mm, 3mm, 5mm and 1mm, and the total rolling reduction is 12mm;
and (3) controlling heat preservation parameters of casting blanks: the casting blank off-line temperature is 650 ℃, the heat preservation time is more than or equal to 36h, and the casting blank pit outlet temperature is less than or equal to 200 ℃.
Rolling: the temperature of the soaking section is 1190 ℃, and the heating time is 380min; the rolling temperature is ensured to be more than or equal to 1100 ℃, and the finishing temperature is ensured to be more than or equal to 850 ℃; the pit entering temperature of the pricked material is more than or equal to 550 ℃, the pit exiting temperature is less than or equal to 200 ℃, and the heat preservation time is more than or equal to 45 hours.
Through detection, the prepared gear round steel for wind power comprises the following alloy components: 0.19% C,0.25% Si,0.70% Mn,0.025% P,0.025% S,1.65% Cr,1.55% Ni,0.30% Mo,0.030% Al,0.015% Cu,0.002% O,0.01% N,0.00015% H,0.022% (La+Ce), the balance being Fe; tensile strength 1150MPa, yield strength 922MPa, elongation at break 25% and impact toughness 250J.
Example 3
The technical scheme of the invention is adopted to prepare the gear round steel for wind power, and the specific steps are as follows:
smelting in an electric furnace: the tapping temperature is 1630 ℃, the end point steel is 0.10 percent C and less than or equal to 0.010 percent P; and (3) pre-deoxidizing and alloying tapping, supplementing Mn, cr, ni, mo alloy according to the target value of alloy components, adding carburant in the tapping process, and tapping 800kg of lime, wherein the weight of aluminum wire is 1.5 kg/t.
LF refining: the white slag time is more than or equal to 30min, and 50kg of silicon carbide (SiC is more than or equal to 85%), carbon powder and Al particles are adopted for diffusion deoxidation; the Al content was controlled at 0.040% at 1642℃when leaving the station.
RH refining: the holding time is more than or equal to 12min under the vacuum degree of 100Pa, the silicon-calcium wire and the rare earth wire are fed after the vacuum is broken, and the wire feeding speed is more than or equal to 150m/min; the static blowing time is more than 15min.
Continuous casting: baking the tundish: three-section heating, firstly adopting small fire with flame length of 300mm, and keeping at 300+/-5 ℃ for 60min; then adopting medium fire, keeping the flame length at 500mm and 1100+/-5 ℃ for 60min; finally, the flame length is 700mm by adopting big fire, and the temperature is kept at 1100+/-5 ℃ for 210min;
continuous casting drawing speed and molten steel superheat degree control: calculating liquidus temperature of corresponding alloy components, controlling the superheat degree of molten steel at 35 ℃, selecting 480mm of casting blank section, and maintaining constant pulling speed in the production process, wherein the pulling speed is 0.47 m/min;
vibration parameters of the crystallizer: adopting a non-sinusoidal vibration mode, wherein C1:5.0, C2:0.0, C3:80.0, C4:25.0, C5:0.0 and C6:0.55;
controlling the water quantity of a crystallizer: broad face 105m 3 /h, narrow face 90m 3 /h；
Controlling the specific water quantity of the secondary cooling water: the total water quantity is 145L/min, and the specific water quantity is 0.25L/kg;
controlling electromagnetic stirring parameters of a crystallizer: 300A,2.5Hz;
and (3) controlling stirring parameters of a battery at the tail end of a casting blank: 520A,7Hz;
stirring mode: alternating stirring (10 s-3s-10 s);
casting blank reduction parameter control: the rolling is carried out for 5 times, the rolling reduction is respectively 1mm, 2mm, 3mm, 5mm and 1mm, and the total rolling reduction is 12mm;
and (3) controlling heat preservation parameters of casting blanks: the casting blank off-line temperature is 700 ℃, the heat preservation time is more than or equal to 36h, and the casting blank pit outlet temperature is less than or equal to 200 ℃.
Rolling: the temperature of the soaking section is 1200 ℃, and the heating time is 420min; the rolling temperature is ensured to be more than or equal to 1100 ℃, and the finishing temperature is ensured to be more than or equal to 850 ℃; the pit entering temperature of the pricked material is more than or equal to 550 ℃, the pit exiting temperature is less than or equal to 200 ℃, and the heat preservation time is more than or equal to 45 hours.
Through detection, the prepared gear round steel for wind power comprises the following alloy components: 0.20% C,0.35% Si,0.80% Mn,0.025% P,0.025% S,1.75% Cr,1.65% Ni,0.35% Mo,0.025% Al,0.013% Cu,0.002% O,0.01% N,0.00015% H,0.25% (La+Ce), the balance being Fe; tensile strength 1160MPa, yield strength 935MPa, elongation at break 26% and impact toughness 255J.
Claims (8)
1. The utility model provides a high strength and toughness gear round steel for wind-powered electricity generation which characterized in that: the gear round steel alloy comprises the following components in percentage by weight: 0.15 to 0.21 percent of C,0.17 to 0.40 percent of Si,0.50 to 0.90 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S,1.50 to 1.80 percent of Cr,1.40 to 1.70 percent of Ni,0.25 to 0.35 percent of Mo, less than or equal to 0.030 percent of Al, less than or equal to 0.015 percent of Cu, less than or equal to 0.002 percent of O, less than or equal to 0.01 percent of N, less than or equal to 0.00015 percent of H,0.015 to 0.03 percent of (La+Ce) and the balance of Fe.
2. The gear round of claim 1, wherein: the La: ce=2 to 3:1, the Al: n=2 to 4:1.
3. the gear round of claim 1, wherein: the tensile strength of the gear round steel is 1130-1170 MPa, the yield strength is 900-940 MPa, the elongation at break is 23-27%, and the impact toughness is 240-260J.
4. A method for producing a gear round steel according to any one of claims 1 to 3, characterized in that: the method comprises the steps of electric furnace smelting, LF furnace refining, RH refining, continuous casting and rolling, wherein the electric furnace smelting is as follows: the tapping temperature is 1620-1630 ℃, the end point steel is 0.05-0.10% C, less than or equal to 0.010% P; and (3) pre-deoxidizing and alloying tapping, supplementing Mn, cr, ni, mo alloy according to the target value of alloy components, adding carburant in the tapping process, and tapping 800kg of lime, wherein the weight of aluminum wire is 1.5 kg/t.
5. The method according to claim 4, wherein: the LF refining process comprises the following steps: the white slag time is more than or equal to 30min, and silicon carbide, carbon powder and Al particles are adopted for diffusion deoxidation; the Al content is controlled to be 0.020-0.040% when leaving the station, and the temperature is 1632-1642 ℃.
6. The method according to claim 4, wherein: the RH refining process comprises the following steps: the holding time is more than or equal to 12min under the vacuum degree of 100Pa, the silicon-calcium wire and the rare earth wire are fed after the vacuum is broken, and the wire feeding speed is more than or equal to 150m/min; the static blowing time is more than 15min.
7. The method according to claim 4, wherein: the continuous casting process comprises the following steps:
baking the tundish: three-section heating, firstly, adopting small fire with flame length of 300mm, and keeping the temperature at 300+/-5 ℃ for 40-60 min; then adopting medium fire, keeping the flame length at 1100+/-5 ℃ for 30-60 min, wherein the flame length is 500 mm; finally, using big fire with flame length of 700mm, and keeping the temperature at 1100+/-5 ℃ for 180-210 min;
continuous casting drawing speed and molten steel superheat degree control: calculating liquidus temperature of corresponding alloy components, controlling the superheat degree of molten steel at 20-35 ℃ and the pulling speed at 0.45-0.47 m/min, and keeping constant pulling speed in the production process;
vibration parameters of the crystallizer: adopting a non-sinusoidal vibration mode, wherein C1:5.0, C2:0.0, C3:80.0, C4:25.0, C5:0.0 and C6:0.55;
controlling the water quantity of a crystallizer: broad surface 95-105 m 3 And/h, the narrow surface is 80-90 m 3 /h；
Controlling the specific water quantity of the secondary cooling water: the total water quantity is 135-145L/min, and the specific water quantity is 0.2-0.25L/kg;
controlling electromagnetic stirring parameters of a crystallizer: 280-300A, 1.5-2.5 Hz;
and (3) controlling stirring parameters of a battery at the tail end of a casting blank: 480 to 520A,5 to 7Hz;
stirring mode: alternately stirring;
casting blank reduction parameter control: the rolling is carried out for 5 times, the rolling reduction is respectively 1mm, 2mm, 3mm, 5mm and 1mm, and the total rolling reduction is 12mm;
and (3) controlling heat preservation parameters of casting blanks: the casting blank off-line temperature is 550-700 ℃, the heat preservation time is more than or equal to 36h, and the casting blank pit outlet temperature is less than or equal to 200 ℃.
8. The method according to claim 4, wherein: the rolling process comprises the following steps: the temperature of the soaking section is 1180-1200 ℃, and the heating time is 350-420 min; the rolling temperature is ensured to be more than or equal to 1100 ℃, and the finishing temperature is ensured to be more than or equal to 850 ℃; the pit entering temperature of the pricked material is more than or equal to 550 ℃, the pit exiting temperature is less than or equal to 200 ℃, and the heat preservation time is more than or equal to 45 hours.
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| CN117778897A (en) * | 2024-02-28 | 2024-03-29 | 江阴方圆环锻法兰有限公司 | Production method of planet wheel forge piece with high grain size stability |
| CN117778897B (en) * | 2024-02-28 | 2024-05-31 | 江阴方圆环锻法兰有限公司 | Production method of planet wheel forge piece with high grain size stability |
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