CN108796373B - Steel for generator excitation element produced by CSP process and manufacturing method thereof - Google Patents
Steel for generator excitation element produced by CSP process and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention relates to steel for an excitation element of an alternating current diesel (gasoline) generator, in particular to steel for the excitation element of the generator produced by a CSP process and a manufacturing method thereof, wherein the steel comprises the following chemical components in percentage by weight: c is less than or equal to 0.10 percent, Mn: 0.5-1.5%, less than or equal to 0.40% of Si, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.030% of Nb, less than or equal to 0.030% of Ti, more than or equal to 0.015% of Als, less than or equal to 0.010% of N, and the balance Fe and other inevitable impurities, wherein the manufacturing method of the steel adopts a CSP short flow, and sequentially comprises the following production steps: blast furnace ironmaking → molten iron pretreatment → converter smelting → RH vacuum treatment → thin slab continuous casting → soaking furnace → descaling → finish rolling → laminar cooling → coiling. By adopting the Nb-Ti composite microalloyed steel, the smelting control is convenient, and the production is stable; by adopting the CSP thin slab continuous casting and rolling process, the method has short production process, high unit running speed and high production efficiency; the produced steel has good magnetic property and mechanical property, and meets the performance requirement of the prior alternating current diesel (gasoline) generator on the steel for the excitation element.
Description
Technical Field
The invention relates to steel for an excitation element of an alternating current diesel (gasoline) generator, in particular to steel for the excitation element of the generator produced by a CSP process and a manufacturing method thereof.
Background
With the rapid development of national economy and the improvement of the living standard of people, most factories, hotels, restaurants and the like are provided with emergency power stations, and diesel (gasoline) generators are increasingly widely applied. In order to meet the requirements of light weight and high efficiency of a diesel (gasoline) generator, the requirements of higher magnetic induction, high coercive force, low iron loss and the like are provided for a generator exciting element.
The existing steel for the exciting element relates to more magnetic pole steel used for large hydroelectric generators, the magnetic pole steel has higher requirements on magnetic induction strength, and has no clear requirements on coercive force and iron loss, and for example, the application numbers CN201210358802.0 and CN201210165348.7 both refer to a manufacturing method of 250MPa grade cold-rolled magnetic pole steel.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the steel for stably producing the excitation element by the CSP short-flow process and the manufacturing method thereof, which ensure the proper mechanical property and meet the requirement of higher magnetic property.
In order to achieve the aim, the invention discloses a steel for a generator excitation element produced by a CSP process, which comprises the following components in percentage by weight: less than or equal to 0.10 percent of C, 0.5 to 1.5 percent of Mn, less than or equal to 0.40 percent of Si, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.030 percent of Nb, less than or equal to 0.030 percent of Ti, more than or equal to 0.015 percent of Als, less than or equal to 0.010 percent of N, and the balance of Fe and other inevitable impurities.
Specifically, the generator excitation element steel produced by the CSP process comprises the following components in percentage by weight: c: 0.05-0.10%, Mn: 0.70-1.0%, less than or equal to 0.35% of Si, less than or equal to 0.015% of P, less than or equal to 0.024% of S, less than or equal to 0.030% of Nb, less than or equal to 0.030% of Ti, more than or equal to 0.040% of Als, less than or equal to 0.006% of N, and the balance of Fe and inevitable impurities.
A manufacturing method of the steel for the generator exciting element produced by the CSP process adopts a CSP short process and sequentially comprises the following production steps: blast furnace ironmaking → molten iron pretreatment → converter smelting → RH vacuum treatment → thin slab continuous casting → soaking furnace → descaling → finish rolling → laminar cooling → coiling.
Specifically, the continuous casting of the sheet billet adopts full-flow protection casting, a long water gap is protected by an asbestos bowl for ladle replacement, and a water gap of a tundish is filled with argon for protection casting; the tundish adopts a dry tundish, and the alkaline tundish is coated with a covering agent.
Specifically, the charging temperature of the soaking pit furnace is controlled to be 800-950 ℃, the time in the furnace is more than 15min, the temperature difference between the same plate and the soaking pit furnace is less than 20 ℃ after the soaking pit furnace is taken out of the furnace, and the temperature of the soaking pit furnace is controlled to be 1230 +/-20 ℃.
Specifically, the finish rolling temperature of the finish rolling is controlled to be 820 +/-20 ℃, and the coiling temperature is controlled to be 620 +/-20 ℃.
The reasons for setting the composition range of the present invention are as follows:
the C content is less than or equal to 0.10 percent, the C is a good solid solution strengthening element, the steel plate strength is simple and economic to improve, but the toughness and the magnetic induction performance of the steel are obviously reduced due to the over-high content of the C element, and the carbon content is controlled to be less than 0.10 percent in order to ensure the mechanical performance and the magnetic performance of the steel plate.
The Mn content of the invention is selected to be 0.5-1.50%, Mn as a replacement type solid solution element can obviously improve the yield strength and the tensile strength of the steel plate, but the magnetic induction strength of the steel plate is reduced along with the increase of the Mn content, so the Mn content is controlled to be 0.5-1.5%.
The Si content is not more than 0.40 percent, the Si can obviously improve the strength and has little influence on the magnetic property, but can reduce the plasticity of the steel, so that the steel plate becomes brittle and the processing property and the surface quality of the steel plate are influenced, therefore, the Si content is not suitable to be too high.
P is less than or equal to 0.025 percent, S and P belong to harmful elements in steel, harmful impurities such as TiS, MnS and the like are easily formed, the strength and the magnetic property of a steel plate are damaged, and therefore the S, P content is reduced in actual production.
The Als is more than or equal to 0.015 percent, Al is a strong deoxidizer, and the deoxidizer has the main function of removing oxygen (O) in molten steel and preventing Nb and Ti alloys from oxidation failure.
The Ti content of the invention is less than or equal to 0.030 percent, the Ti is a strong carbide and nitride forming element, and the formed carbon and nitride can prevent austenite grains from growing in the process of reheating steel and rough rolling of a high-temperature austenite area, thereby playing the role of refining the grains and improving the toughness of the steel. The tiny dispersed TiC is precipitated in the coiling stage, so that the remarkable precipitation strengthening effect can be achieved, and the strength of the steel plate is effectively improved.
The Nb content of the invention is less than or equal to 0.030 percent, and a certain amount of niobium can obviously refine grains and improve strength. Niobium can increase the recrystallization temperature of steel in the controlled rolling process, reduce the load of a rolling mill, and can refine the austenite grain size by inhibiting recrystallization and preventing grain growth. In the cooling process after rolling, the small particles of NbC and NbN are separated out, and the function of precipitation strengthening can be achieved.
The N is less than or equal to 0.010 percent, belongs to normal residue in a converter, can be combined with titanium and niobium in steel to form TiC and NbN precipitation, and plays roles in inhibiting austenite grain growth and strengthening precipitation.
The production method of the invention has the following reasons for controlling the technological parameters:
the invention relates to a continuous casting and rolling process for excitation element steel sheet billet, which comprises the following steps: in the continuous casting process, the whole process is adopted for protection casting, the long water gap during ladle replacement is adopted for protection casting by an asbestos bowl, and the water gap of the tundish is introduced with argon for protection casting. The tundish adopts a dry tundish, and the alkaline tundish is coated with a covering agent. The charging temperature of the soaking pit is controlled to be 800-950 ℃, the charging time is more than 15min, the temperature difference between the same plate and the soaking pit after discharging is less than 20 ℃, and the discharging temperature is controlled to be 1230 +/-20 ℃. Before rolling, an online furnace roller cleaning program is put into use, and the furnace atmosphere is adjusted according to the condition of iron scale. The high-pressure water descaling machine is used for descaling, the steel billet can be fully austenitized by adopting high heating temperature, the purpose of uniform structure is achieved, and meanwhile, compounds in the steel can be fully dissolved and separated out in the cooling process, so that the effect of refining grains can be achieved. The final rolling temperature is controlled at 820 +/-20 ℃, the coiling temperature is controlled at 620 +/-20 ℃, the precipitated phase can be fully precipitated, the grain refinement is facilitated, and the coercivity is improved.
The invention has the beneficial effects that:
1) the steel for the exciting element is designed by adopting the Nb-Ti composite microalloyed steel, so that the smelting control is convenient, and the production is stable.
2) The invention adopts the CSP thin slab continuous casting and rolling process, and the method has short production process, high unit operation speed and high production efficiency.
3) The metallographic structure of the steel for the excitation element produced by the invention is as follows: ferrite, pearlite, free cementite and a small amount of deformation structure, the yield strength of the steel plate is more than or equal to 350MPa, the tensile strength is more than or equal to 450MPa, the elongation is more than or equal to 18 percent, the magnetic property B50 is more than or equal to 1.59T, Hc1.0 is more than or equal to 400A/m, P1.5 is less than or equal to 30W/kg (wherein B50 represents the magnetic flux density when the magnetic field strength is 5000A/m, P1.5 represents the iron loss value when the magnetic flux density is 1.5T, and the steel density is 7.85g/cm3Alternating current magnetization characteristic test, frequency of 50Hz, square ring test device, test samples are respectively half of the transverse direction and the longitudinal direction; hc1.0 represents the coercive force at a magnetic flux density of 1.0T, and the steel material density is 7.85g/cm3Direct current magnetization characteristic test, square ring test device, test sample is half of each of horizontal and vertical).
Detailed Description
The present invention is described in detail below:
table 1 shows the chemical composition of each example of the present invention;
table 2 shows the results of the performance tests of the finished products of the examples of the present invention;
the production of the steel for the exciting element in each embodiment of the invention adopts CSP short process as follows: blast furnace ironmaking → molten iron pretreatment → converter smelting → RH treatment → corrugated plate blank continuous casting → soaking furnace → descaling → finish rolling → laminar cooling → coiling.
The steel for the excitation element of each embodiment of the invention comprises the following chemical components in percentage by weight: less than or equal to 0.10 percent of C, 0.5-1.5 percent of Mn, less than or equal to 0.40 percent of Si, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.030 percent of Nb, less than or equal to 0.030 percent of Ti, more than or equal to 0.015 percent of Als, less than or equal to 0.010 percent of N, and the balance of Fe and other inevitable impurities, wherein the specific chemical components of each embodiment are shown in Table.
The method comprises the following specific steps: KR stirring and desulfurizing molten iron, controlling [ S ]]Less than or equal to 0.025 percent, then carrying out converter top and bottom composite blowing, alloying and RH vacuum treatment. The chemical composition in the steel was made to satisfy the requirements of table 1, and the balance was Fe and inevitable impurities. The molten steel meeting the requirements of table 1 was cast into a continuous slab band of 70mm thickness by a thin slab caster, and cut to length to thin slabs as required. Then the slabs are soaked in soaking pit furnace, and the slabs must be placed into the soaking pit furnaceThe flatness ensures that the slab is stably fed into the furnace, the feeding temperature of the soaking pit furnace is controlled to be 800-950 ℃, the time in the furnace is more than 15min,6the temperature difference between the same plate and the plate after discharging is less than 20 ℃, and the discharging temperature is controlled to be 1130 +/-20 ℃. Before rolling, an online furnace roller cleaning program is put into use, and the furnace atmosphere is adjusted according to the condition of iron scale. And descaling by a high-pressure water descaler. And then directly carrying out controlled rolling on a 7-stand hot continuous rolling unit, controlling the final rolling temperature to be 820 +/-20 ℃, controlling the coiling temperature to be 620 +/-20 ℃, and rapidly cooling the rolled steel strip by laminar flow and coiling the steel strip into a hot rolled steel coil or cutting the steel strip into a steel plate.
The continuous casting and rolling process of the sheet billet is adopted, the whole process is adopted for protective casting in the continuous casting process, the long water gap during ladle replacement is adopted for protective casting by an asbestos bowl, and the water gap of the tundish is introduced with argon for protective casting. The tundish adopts a dry tundish, and the alkaline tundish is coated with a covering agent. The furnace-in time of the soaking furnace is more than 15min, and the temperature difference between the soaking furnace and the plate after the soaking furnace is taken out of the furnace is less than 20 ℃. Before rolling, an online furnace roller cleaning program is put into use, and the furnace atmosphere is adjusted according to the condition of iron scale. The high-pressure water descaler descales the water by adopting high heating temperature.
Example 1: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; feeding the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at 1215 ℃, roughly rolling the casting blank by a high-pressure water descaler and a vertical rolling mill, finishing by a 7-stand continuous rolling mill, and rolling to obtain a 1.0mm thin plate, wherein the final rolling temperature is 815 ℃, and the coiling temperature is 615 ℃. The steel for the field element of example 1 was produced.
Example 2: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; sending the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at 1230 ℃, passing through a high-pressure water descaler, roughly rolling by a vertical rolling mill, finely rolling by a 7-stand continuous rolling mill to obtain a 1.2mm thin plate, wherein the final rolling temperature is 815 ℃, and the coiling temperature is 620 ℃. The steel for the field element of example 2 was produced.
Example 3: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; feeding the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at the temperature of 1235 ℃, roughly rolling the casting blank by a high-pressure water descaler and a vertical rolling mill, finishing by a 7-stand continuous rolling mill, rolling the casting blank to a 1.5mm thin plate, wherein the final rolling temperature is 825 ℃, and the coiling temperature is 625 ℃. The steel for the field element of example 3 was produced.
Example 4: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; will have a thickness of7Feeding the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at the temperature of 1230 ℃, roughly rolling the casting blank by a high-pressure water descaler and a vertical rolling mill, finishing by a 7-stand continuous rolling mill, and rolling the casting blank to a sheet with the thickness of 1.8mm, wherein the final rolling temperature is 825 ℃ and the coiling temperature is 615 ℃. The steel for the field element of example 4 was produced.
Example 5: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; feeding the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at the temperature of 1237 ℃, roughly rolling the casting blank by a high-pressure water descaler and a vertical rolling mill, finishing by a 7-stand continuous rolling mill, rolling the casting blank to a 1.2mm thin plate, wherein the final rolling temperature is 825 ℃ and the coiling temperature is 610 ℃. The steel for the field element of example 5 was produced.
Example 6: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; feeding the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at the temperature of 1236 ℃, roughly rolling the casting blank by a high-pressure water descaler and a vertical rolling mill, finishing by a 7-stand continuous rolling mill, rolling the casting blank to a 1.2mm thin plate, wherein the final rolling temperature is 825 ℃ and the coiling temperature is 610 ℃. The steel for the field element of example 6 was produced.
Comparative example 1: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; feeding the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at the temperature of 1235 ℃, roughly rolling the casting blank by a high-pressure water descaler and a vertical rolling mill, finishing by a 7-stand continuous rolling mill, rolling the casting blank to a 1.0mm thin plate, wherein the final rolling temperature is 825 ℃, and the coiling temperature is 625 ℃. The steel for the field element of comparative example 1 was prepared.
Comparative example 2: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; feeding the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at 1230 ℃, passing through a high-pressure water descaler, roughly rolling by a vertical rolling mill, finely rolling by a 7-stand continuous rolling mill to obtain a 1.2mm thin plate, wherein the final rolling temperature is 825 ℃, and the coiling temperature is 630 ℃. The steel for the field element of comparative example 2 was prepared.
Comparative example 3: the chemical components of the corresponding examples are shown in the table 2 according to the weight percentage, and the balance is Fe and other inevitable impurities; feeding the casting blank with the thickness of 70mm into a roller hearth soaking pit furnace, discharging at the temperature of 1235 ℃, roughly rolling the casting blank by a high-pressure water descaler and a vertical rolling mill, finishing by a 7-stand continuous rolling mill, rolling the casting blank to a 1.5mm thin plate, wherein the final rolling temperature is 825 ℃, and the coiling temperature is 625 ℃. The steel for the field element of comparative example 3 was prepared.
The performance data of the steel products for the excitation elements, which are obtained by inspecting the steels for the excitation elements prepared in examples 1 to 6 and comparative examples 1 to 3, are shown in table 2.
As can be seen from Table 2, the steel for the excitation element produced by the invention has good magnetic property and mechanical property, and meets the performance requirement of the current alternating current diesel (gasoline) generator on the steel for the excitation element.
Table 1 examples chemical composition (w%)
| C | Si | Mn | P | S | Als | N | Nb | Ti | |
| Example 1 | 0.09 | 0.30 | 0.80 | 0.015 | 0.018 | 0.083 | 0.003 | 0.021 | 0.022 |
| Example 2 | 0.07 | 0.26 | 0.89 | 0.011 | 0.024 | 0.062 | 0.004 | 0.024 | 0.019 |
| Example 3 | 0.05 | 0.35 | 0.71 | 0.015 | 0.014 | 0.041 | 0.005 | 0.027 | 0.022 |
| Example 4 | 0.05 | 0.27 | 0.78 | 0.014 | 0.016 | 0.069 | 0.004 | 0.028 | 0.018 |
| Example 5 | 0.06 | 0.29 | 0.98 | 0.012 | 0.024 | 0.077 | 0.003 | 0.025 | 0.024 |
| Example 6 | 0.10 | 0.28 | 0.90 | 0.015 | 0.015 | 0.074 | 0.006 | 0.026 | 0.026 |
| Comparative example 1 | 0.09 | 0.36 | 0.88 | 0.015 | 0.018 | 0.080 | 0.002 | 0.015 | - |
| Comparative example 2 | 0.07 | 0.25 | 0.77 | 0.011 | 0.024 | 0.064 | 0.003 | - | 0.018 |
| Comparative example 3 | 0.05 | 0.15 | 0.73 | 0.015 | 0.014 | 0.043 | 0.004 | - | - |
TABLE 2 test results of the properties of the finished products
Since modifications and variations in the above-described and other embodiments of the invention may occur to persons skilled in the art without departing from the true scope and spirit of the invention, the invention is not limited to the specific embodiments described above.
Claims (6)
1. The steel for the generator exciting element produced by the CSP process is characterized in that: the components and weight percentage content are as follows: the magnetic performance B50 of the steel for the generator excitation element is more than or equal to 1.59T, Hc1.0 is more than or equal to 400A/m, and P1.5 is more than or equal to 30W/kg.
2. The steel for a generator exciting element produced by the CSP process according to claim 1, characterized in that: the components and weight percentage content are as follows: c: 0.05-0.10%, Mn: 0.70-1.0%, less than or equal to 0.35% of Si, less than or equal to 0.015% of P, less than or equal to 0.024% of S, less than or equal to 0.030% of Nb, less than or equal to 0.030% of Ti, more than or equal to 0.040% of Als, less than or equal to 0.006% of N, and the balance of Fe and inevitable impurities.
3. The method for manufacturing a steel for a generator exciting element produced by the CSP process according to claim 1, wherein: the method adopts a CSP short flow and sequentially comprises the following production steps: blast furnace ironmaking → molten iron pretreatment → converter smelting → RH vacuum treatment → thin slab continuous casting → soaking furnace → descaling → finish rolling → laminar cooling → coiling.
4. The method for manufacturing the steel for the generator exciting element produced by the CSP process according to claim 3, wherein: the continuous casting of the sheet billet adopts full-flow protection casting, a long water gap during ladle replacement adopts an asbestos bowl for protection casting, and a water gap of a tundish is introduced with argon for protection casting; the tundish adopts a dry tundish, and the alkaline tundish is coated with a covering agent.
5. The method for manufacturing the steel for the generator exciting element produced by the CSP process according to claim 3, wherein: the charging temperature of the soaking pit is controlled to be 800-950 ℃, the charging time is more than 15min, the temperature difference between the same plate and the soaking pit after discharging is less than 20 ℃, and the discharging temperature is controlled to be 1230 +/-20 ℃.
6. The method for manufacturing the steel for the generator exciting element produced by the CSP process according to claim 3, wherein: the finish rolling temperature of the finish rolling is controlled to be 820 +/-20 ℃, and the coiling temperature is controlled to be 620 +/-20 ℃.
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|---|---|---|---|---|
| CN1785544A (en) * | 2005-12-15 | 2006-06-14 | 广州珠江钢铁有限责任公司 | Technology of eliminating Nb microalloyed steel mixed crystal fexture in thin plate blank continuous casting continuous milling process |
| CN103540845A (en) * | 2013-11-07 | 2014-01-29 | 武汉钢铁(集团)公司 | Hot-rolled thin plate enamelled steel with yield strength of 330 MPa and manufacturing method thereof |
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| CN102787273A (en) * | 2012-08-21 | 2012-11-21 | 武汉钢铁(集团)公司 | Sheet-billet produced hot-rolled pickled steel with thickness of 1.8mm or lower for automobile and production method thereof |
| AT512399B1 (en) * | 2012-09-10 | 2013-08-15 | Siemens Vai Metals Tech Gmbh | Method for producing a microalloyed tubular steel in a cast-rolled composite plant and microalloyed tubular steel |
| CN103667907B (en) * | 2013-12-03 | 2016-06-29 | 武汉钢铁(集团)公司 | Tensile strength 510MPa level hot rolling high tensile thin steel plate and production method thereof |
| CN103695766B (en) * | 2013-12-03 | 2016-06-29 | 武汉钢铁(集团)公司 | Tensile strength 440MPa level hot rolling high tensile thin steel plate and production method thereof |
| CN103667906B (en) * | 2013-12-03 | 2016-02-03 | 武汉钢铁(集团)公司 | Tensile strength 590MPa level hot rolling High Tensile Thin Steel Plate and production method thereof |
| CN103667908B (en) * | 2013-12-03 | 2017-01-25 | 武汉钢铁(集团)公司 | Hot-rolled high-strength sheet steel having tensile strength of 540MPa, and production method thereof |
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| CN1785544A (en) * | 2005-12-15 | 2006-06-14 | 广州珠江钢铁有限责任公司 | Technology of eliminating Nb microalloyed steel mixed crystal fexture in thin plate blank continuous casting continuous milling process |
| CN103540845A (en) * | 2013-11-07 | 2014-01-29 | 武汉钢铁(集团)公司 | Hot-rolled thin plate enamelled steel with yield strength of 330 MPa and manufacturing method thereof |
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