CN115896623A - Production method of structural steel plate for thick-specification high-toughness yield strength 420 MPa-level wind power generation tower - Google Patents
Production method of structural steel plate for thick-specification high-toughness yield strength 420 MPa-level wind power generation tower Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 20
- 238000010248 power generation Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 238000005096 rolling process Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 23
- 238000009749 continuous casting Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000005496 tempering Methods 0.000 claims abstract description 9
- 229910001563 bainite Inorganic materials 0.000 claims abstract description 4
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 4
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 238000010583 slow cooling Methods 0.000 claims description 4
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- 238000003892 spreading Methods 0.000 claims description 2
- 230000007480 spreading Effects 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 239000000956 alloy Substances 0.000 abstract description 6
- 238000003723 Smelting Methods 0.000 abstract description 5
- 238000003466 welding Methods 0.000 description 4
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 3
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- 238000010276 construction Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
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- 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
Abstract
The invention discloses a production method of a structural steel plate for a thick-specification high-toughness yield strength 420 MPa-level wind power generation tower, which adopts low-component design, only adopts cheap Si, mn, nb, V, ti and other alloys, produces wind power steel with good comprehensive performance except the yield strength 420 MPa-level wind power through proper smelting, continuous casting, heating, controlled rolling and controlled cooling processes, and has stable process and low process manufacturing cost through a tempering heat treatment process; the steel plate has good strength, plasticity and toughness, and the structure is fine ferrite, pearlite and bainite. The yield strength of the steel plate is between 415 and 463MPa, the tensile strength is between 542 and 584MPa, the elongation is between 28 and 33.5 percent, and the impact energy at minus 40 ℃ is between 239 and 267.
Description
Technical Field
The invention relates to the field of hot rolling, in particular to a production method of a structural steel plate for a thick-specification high-toughness yield strength 420 MPa-level wind power generation tower.
Background
With the rapid development of power grid construction in China, novel high-strength structural steel represented by Q420 steel is widely applied to the production and construction of power grid iron towers. The Q420 steel is different from common low alloy steel, and is a new generation of low alloy high strength steel produced by applying strong carbide forming elements such as Nb, V, ti and the like on the basis of a smelting process of the common low alloy steel and based on establishment of a strengthening and toughening mechanism of the steel with grain refinement and precipitation strengthening as main contents. The Q420 steel is microalloyed steel with the main characteristics of low carbon and high purity, has excellent mechanical property, has higher strength and better toughness, and can greatly improve the stability of an iron tower when being used for a power grid iron tower structure.
Under the condition of considering impact toughness, plate shape and welding performance of the steel plate, the 60-80mm thick wind power steel is difficult to produce on a wide and thick plate production line and needs higher technical control level.
The patent publication No. CN 112126847A discloses a steel plate for a large-thickness Q420FTE high-strength wind tower structure and a production method thereof, and provides thick-specification wind power steel and a preparation method thereof. The method adopts a controlled rolling and controlled cooling production method, designs the steel plate for the wind tower structure meeting the standard requirements, and has better performance in the thickness direction and welding performance. However, the method adopts a rolling and cooling control production process, the performance stability fluctuation is large, the TMCP + tempering heat treatment mode is adopted, the uniformity of the steel plate performance is ensured, and the production efficiency can be improved under the condition of stable process.
The patent publication No. CN 106591718A of ' 420MPa grade high-toughness acid-resistant quenched and tempered pipe steel plate with yield and temper grade ' and a production method thereof ' provides a production method of a 420MPa grade steel plate with 100mm of plate thickness produced by a controlled rolling process and a quenching and tempering process. The steel plate produced by the method has low yield ratio, low-temperature impact toughness and excellent welding performance. The method adopts a TMCP + tempering heat treatment mode, saves the quenching process and the process cost, and simultaneously adopts a low-carbon component design, adds a small amount of alloy components and has lower cost.
The patent publication No. CN 102776443A "420 MPa grade low-alloy high-strength extra-thick steel plate and manufacturing method thereof" provides a production method of low-alloy high-strength steel with 100-160mm thickness and yield grade 420MPa, the impact energy is-20 ℃, the impact energy temperature of the patent is-40 ℃, and the low-temperature impact toughness of the patent is superior to that of a retrieval patent.
Disclosure of Invention
The invention aims to provide a production method of a thick structural steel plate with high toughness and yield strength of 420MPa for a wind power generation tower, which is used for producing a structural steel plate with the yield strength of 420MPa for the wind power generation tower, which is stable, excellent in toughness and good in welding performance and has the thickness of 60-80 mm.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention relates to a production method of a structural steel plate for a thick-specification high-toughness yield strength 420 MPa-level wind power generation tower, which comprises the following chemical components in percentage by weight: c:0.13 to 0.15 percent; si:0.25 to 0.35 percent; mn:1.50 to 1.60 percent; 0.030 to 0.040 percent of Nb; 0.030 to 0.040 percent of V; 0.006 to 0.016 percent of Ti; p is less than or equal to 0.015 percent; s is less than or equal to 0.005 percent; ca:0.0008 to 0.0025 percent; and Als:0.017 to 0.027 percent; o is less than or equal to 0.0035 percent; n: less than or equal to 0.0052 percent; the balance of iron and inevitable impurities; the production method specifically comprises the following steps:
1) In order to ensure a certain compression ratio and slab quality, a continuous casting slab with the thickness of 250mm is selected, and the center segregation of the casting slab is not more than B1.0;
2) Carrying out RH furnace treatment on the molten steel, wherein the treatment time is not less than 17 minutes under the condition that the vacuum degree is not more than 112 Pa;
3) The thickness of the continuous casting billet is 250mm, the superheat degree is controlled at 15-28 ℃ during molten steel casting, the drawing speed is 0.9-1.1 m/min, electromagnetic stirring and light pressing are adopted during continuous casting, the light pressing position is the front three and four sections of a solidification terminal, and the total pressing amount is 8.0mm; electromagnetic stirring is adopted during continuous casting, the electromagnetic stirring positions are 4 sections and 5 sections, the electromagnetic stirring frequency is 5Hz, and the current is 380A; the water quantity of the wide side of the crystallizer is 4500L/min, the water quantity of the narrow side of the crystallizer is 370L/min, the water inlet temperature of the crystallizer is controlled at 36 +/-2 ℃, the water inlet temperature of the crystallizer is controlled at 38 +/-1 ℃, the temperature of secondary cooling water is controlled at 22-25 ℃, and the water quality index meets the process requirement; protective pouring is adopted, the pressure of the sealing argon gas at the long nozzle is controlled to be more than or equal to 0.3MPa, and the flow is controlled to be 130-160L/min; the pressure of the argon gas for sealing the immersion water inlet of the tundish is 0.2Mpa, and the flow is 15-20L/min; . Controlling the straightening temperature of the casting blank to be 950-1000 ℃, and ensuring that the temperature difference of the casting blank along the width direction does not exceed 50 ℃ to perform protection pouring, and preventing secondary oxidation of molten steel and gas suction nitrogen increase;
4) A heating process: the method is characterized in that a continuous casting slab with the thickness of 250mm is adopted for production, the temperature of the surface of the slab entering the furnace is not more than 120 ℃, a stepping heating furnace is adopted when the slab is heated, the tapping temperature of the continuous casting slab is 1150-1250 ℃, the heating time is 220-260 minutes, and the heating time of the slab in a soaking section is not less than 30 minutes. The moving speed of the movable beam for supporting the plate blank is 1.10m/min when the plate blank is heated in the heating furnace;
5) The rolling forming process of the steel plate with the thickness of 60 mm-80 mm comprises the following steps: the slab is controlled to be rolled after being heated, the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1130-1220 ℃, the final rolling temperature of the first stage is more than or equal to 980 ℃, the single pass reduction rate during the high-temperature elongation rolling of the first stage is more than or equal to 11.5 percent, the rolling speed of the first stage is 1.7-3.1 m/s, and the set torque is 2150 kN.m during the rolling of the first stage; the initial rolling thickness of the second stage steel plate is 2 times of the thickness of the finished steel plate, the initial rolling temperature of the second stage steel plate is 855 to 905 ℃, and the final rolling temperature of the second stage is 790 to 860 ℃; the rolling speed of the second stage is 3.5-4.5 m/s, the set torque is 2280 kN.m during the second stage rolling, and the final reduction rate of the second stage is more than or equal to 5.5 percent. Carrying out laminar cooling after the steel plate is rolled, wherein the water temperature of an ACC is 17-19 ℃, the cooling speed is 8-12 ℃/s, the final cooling temperature is 599-645 ℃, the speed of an ACC roller table is 1.70-1.90 m/s, and the cooling water flow ratio of an ACC lower spray beam to an ACC upper spray beam is 2.00;
6) Adopts a tempering heat treatment process, the tempering heat preservation temperature is 380-420 ℃, the heat preservation time is more than 20 minutes, and the furnace time is 160-200 min. And discharging for air cooling, spreading and cooling to 200 ℃, and then adopting stacking for slow cooling, wherein the slow cooling time is more than 6 hours.
Further, the structure of the steel plate is fine ferrite, pearlite and bainite; the yield strength of the steel plate is between 415 and 463MPa, the tensile strength is between 542 and 584MPa, the elongation is between 28 and 33.5 percent, and the impact energy at minus 40 ℃ is between 239 and 267.
Further, the structural steel plate comprises the following chemical components in percentage by weight: 0.14% of C, 0.31% of Si, 1.49% of Mn, 0.016% of P, 0.002% of S, 0.024% of Als, 0.035% of Nb, 0.032% of V, 0.010% of Ti, 0.0016% of Ca and 0.6ppm of H; 0.0032 percent of O; n:0.0040%; the balance of iron and unavoidable impurities.
Further, the structural steel plate comprises the following chemical components in percentage by weight: 0.15% of C, 0.30% of Si, 1.53% of Mn, 0.012% of P, 0.004% of S, 0.026% of Als, 0.032% of Nb, 0.034% of V, 0.012% of Ti, 0.0021% of Ca and 0.5ppm of H; 0.0027 percent of O; n:0.0035%; the balance of iron and unavoidable impurities.
Further, the structural steel plate comprises the following chemical components in percentage by weight: 0.14% of C, 0.28% of Si, 1.58% of Mn, 0.011% of P, 0.003% of S, 0.027% of Als, 0.032% of Nb, 0.036% of V, 0.013% of Ti, 0.0020% of Ca and 0.4ppm of H; 0.0028 percent of O; n:0.0031%; the balance of iron and unavoidable impurities.
Compared with the prior art, the invention has the beneficial technical effects that:
1) The invention adopts low-component design, only adopts cheap Si, mn, nb, V, ti and other alloys, produces the wind power steel with good comprehensive performance except the yield strength of 420MPa grade through proper smelting, continuous casting, heating, controlled rolling and controlled cooling processes, and has stable process and low process manufacturing cost through the tempering heat treatment process.
2) The steel plate has good strength, plasticity and toughness, and the structure is fine ferrite, pearlite and bainite. The yield strength of the steel plate is between 415 and 463MPa, the tensile strength is between 542 and 584MPa, the elongation is between 28 and 33.5 percent, and the impact energy at the temperature of minus 40 ℃ is between 239 and 267.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a metallographic photograph of a structure of 1/4 position F + P + B in a tempered state in example 2 of the present invention;
FIG. 2 is a metallographic photograph of a tempered state TMCP + of example 2 of the present invention, wherein the 1/2 site structure is F + P + B.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
And (3) placing the plate blank to be rolled after smelting and continuous casting into a heating furnace, wherein the heating time is 240 minutes, and the soaking time is 35 minutes. The slab comprises the following chemical components in percentage by mass: 0.14% of C, 0.31% of Si, 1.49% of Mn1, 0.016% of P, 0.002% of S, 0.024% of Als, 0.035% of Nb, 0.032% of V, 0.010% of Ti, 0.0016% of Ca and 0.6ppm of H; 0.0032 percent of O; n:0.0040%; the balance being Fe and unavoidable impurities. The steel plate with the thickness of 60mm is rolled, the detailed rolling and heat treatment process is shown in table 1, and the mechanical property is shown in table 2.
Example 2
And (3) placing the smelted and continuously cast plate blank to be rolled into a heating furnace, wherein the heating time is 230 minutes, and the soaking time is 33 minutes. The slab comprises the following chemical components in percentage by mass: 0.15% of C, 0.30% of Si, 1.53% of Mn, 0.012% of P, 0.004% of S, 0.026% of Als, 0.032% of Nb, 0.034% of V, 0.012% of Ti, 0.0021% of Ca and 0.5ppm of H; 0.0027 percent of O; n:0.0035%; the balance being Fe and unavoidable impurities. The steel plate is rolled into a steel plate with the thickness of 70mm, the detailed rolling and heat treatment process is shown in table 1, and the mechanical property is shown in table 2.
Example 3
And (3) placing the plate blank to be rolled after smelting and continuous casting into a heating furnace, wherein the heating time is 260 minutes, and the soaking time is 40 minutes. The slab comprises the following chemical components in percentage by mass: 0.14% of C, 0.28% of Si, 1.58% of Mn, 0.011% of P, 0.003% of S, 0.027% of Als, 0.032% of Nb, 0.036% of V, 0.013% of Ti, 0.0020% of Ca and 0.4ppm of H; 0.0028 percent of O; n:0.0031%; the balance being Fe and unavoidable impurities. The steel plate with the thickness of 80mm is rolled, the detailed rolling and heat treatment process is shown in table 1, and the mechanical property is shown in table 2.
TABLE 1 Process parameters for examples 1 to 3
TABLE 2 mechanical Properties of examples 1 to 3
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. The production method of the structural steel plate for the thick-specification high-toughness yield strength 420 MPa-level wind power generation tower is characterized in that the structural steel plate comprises the following chemical components in percentage by weight: c:0.13 to 0.15 percent; si:0.25 to 0.35 percent; mn:1.50 to 1.60 percent; 0.030 to 0.040 percent of Nb; 0.030 to 0.040 percent of V; 0.006 to 0.016 percent of Ti; p is less than or equal to 0.015 percent; s is less than or equal to 0.005 percent; ca:0.0008 to 0.0025 percent; and Als:0.017 to 0.027 percent; o is less than or equal to 0.0035 percent; n: less than or equal to 0.0052 percent; the balance of iron and inevitable impurities; the production method specifically comprises the following steps:
1) In order to ensure a certain compression ratio and slab quality, a continuous casting slab with the thickness of 250mm is selected, and the center segregation of the casting slab is not more than B1.0;
2) Carrying out RH furnace treatment on the molten steel, wherein the treatment time is not less than 17 minutes under the condition that the vacuum degree is not more than 112 Pa;
3) The thickness of the continuous casting billet is 250mm, the superheat degree is controlled at 15-28 ℃ during molten steel casting, the drawing speed is 0.9-1.1 m/min, electromagnetic stirring and light pressing are adopted during continuous casting, the light pressing position is the front three and four sections of a solidification terminal, and the total pressing amount is 8.0mm; electromagnetic stirring is adopted during continuous casting, the electromagnetic stirring positions are 4 sections and 5 sections, the electromagnetic stirring frequency is 5Hz, and the current is 380A; the water quantity of the wide side of the crystallizer is 4500L/min, the water quantity of the narrow side of the crystallizer is 370L/min, the water inlet temperature of the crystallizer is controlled at 36 +/-2 ℃, the water inlet temperature of the crystallizer is controlled at 38 +/-1 ℃, the temperature of secondary cooling water is controlled at 22-25 ℃, and the water quality index meets the process requirement; adopting protective pouring, controlling the pressure of the long-nozzle sealed argon gas to be more than or equal to 0.3MPa, and controlling the flow to be 130-160L/min; the pressure of the argon gas for sealing the immersion water inlet of the tundish is 0.2Mpa, and the flow is 15-20L/min; . Controlling the straightening temperature of the casting blank to be 950-1000 ℃, and carrying out protective pouring on the casting blank when the temperature difference of the casting blank along the width direction does not exceed 50 ℃, wherein secondary oxidation of molten steel and gas suction nitrogen increase are prevented;
4) A heating process: the method is characterized in that a continuous casting slab with the thickness of 250mm is adopted for production, the temperature of the surface of the slab entering the furnace is not more than 120 ℃, a stepping heating furnace is adopted when the slab is heated, the tapping temperature of the continuous casting slab is 1150-1250 ℃, the heating time is 220-260 minutes, and the heating time of the slab in a soaking section is not less than 30 minutes. When the plate blank is heated in the heating furnace, the moving speed of the movable beam for supporting the plate blank is 1.10m/min;
5) The rolling forming process of the steel plate with the thickness of 60 mm-80 mm comprises the following steps: the slab is controlled to be rolled after being heated, the initial rolling thickness of the first stage is the slab thickness, the initial rolling temperature of the first stage is 1130-1220 ℃, the final rolling temperature of the first stage is more than or equal to 980 ℃, the single pass reduction rate during the high-temperature elongation rolling of the first stage is more than or equal to 11.5 percent, the rolling speed of the first stage is 1.7-3.1 m/s, and the set torque is 2150 kN.m during the rolling of the first stage; the initial rolling thickness of the second stage steel plate is 2 times of the thickness of the finished steel plate, the initial rolling temperature of the second stage steel plate is 855-905 ℃, and the final rolling temperature of the second stage is 790-860 ℃; the rolling speed of the second stage is 3.5-4.5 m/s, the set torque is 2280 kN.m during the second stage rolling, and the final reduction rate of the second stage is more than or equal to 5.5 percent. Carrying out laminar cooling after rolling the steel plate, wherein the water temperature of an ACC is 17-19 ℃, the cooling speed is 8-12 ℃/s, the final cooling temperature is 599-645 ℃, the speed of an ACC roller bed is 1.70-1.90 m/s, and the cooling water flow ratio of an ACC lower spray beam to an ACC upper spray beam is 2.00;
6) Adopts a tempering heat treatment process, the tempering heat preservation temperature is 380-420 ℃, the heat preservation time is more than 20 minutes, and the furnace time is 160-200 min. And discharging for air cooling, spreading and cooling to 200 ℃, and then adopting stacking for slow cooling, wherein the slow cooling time is more than 6 hours.
2. The method for producing the structural steel plate for the wind power generation tower with the thick gauge and the high toughness yield strength of 420MPa according to claim 1, wherein the steel plate has a fine ferrite + pearlite + bainite structure; the yield strength of the steel plate is between 415 and 463MPa, the tensile strength is between 542 and 584MPa, the elongation is between 28 and 33.5 percent, and the impact energy at minus 40 ℃ is between 239 and 267.
3. The production method of the structural steel plate for the thick-gauge high-toughness yield strength 420 MPa-grade wind power generation tower according to claim 1, wherein the structural steel plate comprises the following chemical components in percentage by weight: 0.14% of C, 0.31% of Si, 1.49% of Mn, 0.016% of P, 0.002% of S, 0.024% of Als, 0.035% of Nb, 0.032% of V, 0.010% of Ti, 0.0016% of Ca and 0.6ppm of H; 0.0032 percent of O; n:0.0040%; the balance of iron and unavoidable impurities.
4. The production method of the structural steel plate for the thick-gauge high-toughness yield strength 420 MPa-grade wind power generation tower according to claim 1, wherein the structural steel plate comprises the following chemical components in percentage by weight: 0.15% of C, 0.30% of Si, 1.53% of Mn, 0.012% of P, 0.004% of S, 0.026% of Als, 0.032% of Nb, 0.034% of V, 0.012% of Ti, 0.0021% of Ca and 0.5ppm of H; 0.0027 percent of O; n:0.0035%; the balance of iron and unavoidable impurities.
5. The production method of the structural steel plate for the thick-gauge high-toughness yield strength 420 MPa-grade wind power generation tower according to claim 1, wherein the structural steel plate comprises the following chemical components in percentage by weight: 0.14% of C, 0.28% of Si, 1.58% of Mn, 0.011% of P, 0.003% of S, 0.027% of Als, 0.032% of Nb, 0.036% of V, 0.013% of Ti, 0.0020% of Ca and 0.4ppm of H; 0.0028 percent of O; n:0.0031%; the balance of iron and unavoidable impurities.
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