WO2025200042A1 - Procédé de fabrication et de préparation de barre d'acier pour roue de turbine à vapeur - Google Patents

Procédé de fabrication et de préparation de barre d'acier pour roue de turbine à vapeur

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Publication number
WO2025200042A1
WO2025200042A1 PCT/CN2024/086330 CN2024086330W WO2025200042A1 WO 2025200042 A1 WO2025200042 A1 WO 2025200042A1 CN 2024086330 W CN2024086330 W CN 2024086330W WO 2025200042 A1 WO2025200042 A1 WO 2025200042A1
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Prior art keywords
pass
steel
temperature
width
height
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English (en)
Chinese (zh)
Inventor
张群
卢秉军
阚开
齐峰
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Bengang Steel Plates Co Ltd
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Bengang Steel Plates Co Ltd
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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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C21C7/0025—Adding carbon material
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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
    • 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
    • C21C7/10—Handling in a vacuum
    • 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
    • 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
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to the technical field of steel materials, and in particular to a method for producing a steel bar for a steam turbine impeller.
  • the steam turbine impeller is one of the most critical components in a steam turbine, converting the kinetic energy of high-speed fluid into mechanical energy. It performs a crucial role within the steam turbine. As the only component in the steam turbine that comes into direct contact with the fluid, the impeller operates under extremely harsh conditions, needing to withstand complex operating conditions such as high pressure, high temperature, high speed, and strong vibration. As a crucial component of the steam turbine, the impeller is subject to stringent quality requirements.
  • the purpose of the present invention is to provide a method for producing and preparing steel bars for turbine impellers.
  • the method adopts a converter + LF + RH + continuous casting smelting process smelting and rolling process to produce a steel bar for turbine impellers that meets high-end usage requirements and achieves a breakthrough in the batch production of steel bars for turbine impellers using a converter continuous casting process. It not only ensures the mechanical properties, high hardness and high steel purity of the finished steel bar for turbine impellers, but also ensures the surface quality level of the steel bar for turbine impellers.
  • the present invention provides a method for producing steel bars for steam turbine impellers, including composition and process design, specifically the following steps: converter smelting ⁇ LF refining ⁇ RH vacuum degassing ⁇ continuous casting ⁇ heating ⁇ blooming mill rolling ⁇ continuous rolling mill.
  • This method meets the quality requirements for steam turbine impeller steel bars, while also achieving high standards for mechanical properties, high hardness, and high steel purity.
  • a method for producing steel bars for steam turbine impellers wherein the process route comprises: converter smelting ⁇ refining outside the furnace (LF+RH) ⁇ continuous casting ⁇ heating process in a heating furnace ⁇ rolling process ⁇ insulation process.
  • the converter smelting is as follows: using scrap steel and molten iron for smelting, with scrap steel accounting for 26-30% by mass and molten iron accounting for 70-74% by mass; oxygen oxidation, intense boiling, tapping temperature of 1685-1695°C, oxygen supply time of 15-20 minutes, operation time of 45-55 minutes, end point oxygen of 620-640ppm, and C of 0.13-0.15% at the time of tapping. P ⁇ 0.007%. Auxiliary materials and alloys are added when 1/4 to 1/3 of the steel is tapped.
  • Alloy addition per ton of steel 6.2-6.3 kg/t silicon manganese, 0.9-0.95 kg/t ferrosilicon, 1.6-1.7 kg/t ferroaluminum, 2.8-2.9 kg/t ferrovanadium, and 3.8-4.0 kg/t ferromolybdenum.
  • Auxiliary material addition per ton of steel 11-11.5 kg/t limestone, 34-35 kg/t activated limestone, 19-20 kg/t dolomite, and 11-11.5 kg/t sintered ore.
  • the LF refining is further as follows: a high current of 20,000 to 25,000 A is used to heat and melt the slag; when the slag surface fluctuates and the molten steel and the arc are not exposed, active lime is added; after 5 to 7 minutes, the chemical composition is analyzed for the first time; alloy is added according to the target chemical composition value, and butane carburizer is added for carburization; the alloy and butane carburizer should be added to the argon flow to promote rapid melting and homogenization of the alloy and butane carburizer.
  • the diameter of the carbon cored wire is 10-10.5 mm.
  • the RH refining further comprises the following steps: before starting the vacuum pump, the argon pressure is controlled at 0.1-0.3 MPa, so that the slag surface is slightly moved to prevent the molten steel from being exposed.
  • the ladle clearance is 400-420 mm, and the slag thickness is 95-105 mm.
  • the vacuum reaches 90-100 Pa, the timing is started and maintained for 15-25 minutes.
  • the argon pressure is then adjusted to 0.3-0.5 MPa.
  • 1.1-1.2 meters of calcium silicon wire per ton of steel is added, and the post-treatment temperature is 1570-1580°C.
  • the diameter of the carbon cored wire is 10-10.5 mm.
  • the continuous casting is: continuous casting 1530 ⁇ 1535°C, platform temperature 1560 ⁇ 1570°C, pulling speed 0.42 ⁇ 0.43m/min, tundish H control ⁇ 2ppm, crystallizer electromagnetic stirring current 400 ⁇ 410A, end electromagnetic stirring current 330 ⁇ 340A, frequency 7 ⁇ 8Hz; full process protection casting, crystallizer protective slag uses medium carbon steel protective slag; light pressure is applied to put in the 2nd, 3rd and 4th rollers, and the reduction amount is 3 ⁇ 3.1mm, 4 ⁇ 4.1mm and 4 ⁇ 4.1mm respectively; the billet cutting adopts a combination of automatic and manual methods, the continuous casting billet is padded with red steel, and the billets from two furnaces are pressed up to ensure flatness, and the holding time is 30 ⁇ 40h.
  • the heating process is as follows: the temperature entering the heating furnace is 350°C ⁇ 520°C, the temperature of the preheating section is required to be 650°C ⁇ 700°C, and the time is 1.2 ⁇ 1.5h; the temperature of the heating section 2 is required to be 850°C ⁇ 870°C, and the time is 1.2 ⁇ 1.5h; the temperature of the heating section 1 is required to be 1210°C ⁇ 1240°C, and the time is 1.2 ⁇ 1.5h; the temperature of the soaking section is required to be 1200°C ⁇ 1230°C, and the time is 1.2 ⁇ 1.5h; the steel tapping temperature is 1180°C ⁇ 1210°C.
  • the initial rolling process produces an intermediate billet with a height of 268-268.1mm and a width of 232-232.1mm; the first pass has a height of 229-229.1mm and a width of 245-245.1mm; the second pass has a height of 192-192.1mm and a width of 235-235.1mm; the third pass has a height of 200-200.1mm and a width of 195-195.1mm; the fourth pass has a height of 160-160.1mm and a width of 214.7-214.8mm; the fifth pass has a height of 229-229.1mm and a width of 245-245.1mm; the fifth pass has a height of 192-192.1mm and a width of 235-235.1mm; the fifth pass has a height of 200-200.1mm and a width of 195-195.1mm; the fifth pass has a height of 160-160.1mm and a width of 214.7-214.8mm; The second high is 168 ⁇ 168.1mm, and the width is 174.6 ⁇ 174.7mm; the sixth high is 120 ⁇
  • the insulation process is: steel insulation, pit entry temperature ⁇ 560°C, pit exit temperature ⁇ 200°C, insulation time ⁇ 48h.
  • the steel after insulation is subjected to heat treatment, and the heat treatment process includes the following steps:
  • the converter + LF + RH + continuous casting smelting process and rolling process are used to produce steel bars for steam turbine impellers.
  • the production specification is ⁇ 120mm, which meets the mechanical performance requirements and ensures the purity of the steel.
  • the chemical composition by mass percentage, is C: 0.34%, Si: 0.25%, Mn: 0.50%, P: 0.010%, S: 0.005%, Cr: 1.10%, Ni: 0.05%, Cu: 0.02%, Mo: 0.25%, V: 0.15%, and the balance is iron and inevitable impurities.
  • Converter smelting The raw materials are 28% scrap steel and 72% molten iron by mass. The raw materials are oxidized by oxygen and subjected to intense boiling. The tapping temperature is 1688°C, the oxygen supply time is 18 minutes, the operation time is 50 minutes, the final oxygen content is 625ppm, the carbon content is 0.14% and the phosphorus content is 0.005% at the time of tapping. Auxiliary materials and alloys are added when 1/4 of the steel is tapped. The amount of alloy added per ton of steel is: 6.2 kg/t silicon manganese, 0.92 kg/t ferrosilicon, 1.6 kg/t ferroaluminum, 2.8 kg/t ferrovanadium, and 3.9 kg/t ferromolybdenum. The amount of auxiliary materials added per ton of steel is: 11.2 kg/t limestone, 34 kg/t activated limestone, 19 kg/t dolomite, and 11.2 kg/t sintered ore.
  • (2) LF furnace Use 22000A high current to heat and melt slag.
  • active lime After 5 minutes, take the first sample for chemical composition analysis.
  • the alloy and carbon nitrate carburizer should be added to the argon flow to promote rapid melting and homogenization of the alloy and carbon nitrate carburizer.
  • the molten steel temperature reaches 1590°C, add 2kg/t diffusion deoxidizer for diffusion deoxidation. Close the furnace door for 10 minutes.
  • Continuous casting continuous casting at 1533°C, platform temperature at 1565°C, casting speed at 0.42m/min, tundish H control at 1.4ppm, crystallizer electromagnetic stirring current at 405A, terminal electromagnetic stirring current at 335A, frequency at 7Hz; full-process protective casting, crystallizer protective slag using medium carbon steel protective slag; lightly press down the second, third, and fourth rollers, with a reduction of 3mm, 4mm, and 4mm respectively; ingot cutting is carried out by a combination of automatic and manual methods, with red steel as the bottom of the continuous casting ingot and upper pressure on the two furnaces to ensure straightness, and the holding time is 37h.
  • Heating process The temperature entering the heating furnace is 450°C, the preheating section temperature is required to be 680°C, and the time is 1.4h; the temperature of the heating section 2 is required to be 860°C, and the time is 1.4h; the temperature of the heating section 1 is required to be 1230°C, and the time is 1.3h; the temperature of the soaking section is required to be 1220°C, and the time is 1.3h; the steel tapping temperature is 1195°C.
  • the second highest pass is 192mm and the width is 235mm; the third pass is 200mm and the width is 195mm; the fourth pass is 160mm and the width is 214.7mm; the fifth pass is 168mm and the width is 174.6mm; the sixth pass is 120mm and the width is 187.6mm; the seventh pass is 142mm and the width is 138.5mm; the eighth pass is 111mm and the width is 151.5mm; the ninth pass is 122.04mm and the width is 122.04mm.
  • the finished product is produced after the 9th pass.
  • the chemical composition by mass percentage, is C: 0.33%, Si: 0.25%, Mn: 0.50%, P: 0.011%, S: 0.004%, Cr: 1.08%, Ni: 0.05%, Cu: 0.02%, Mo: 0.25%, V: 0.15%, and the balance is iron and inevitable impurities.
  • Converter smelting The raw materials are 27% scrap steel and 73% molten iron by mass. The raw materials are oxidized by oxygen and subjected to intense boiling. The tapping temperature is 1688°C, the oxygen supply time is 18 minutes, the operation time is 50 minutes, the final oxygen content is 625ppm, the carbon content is 0.14% and the phosphorus content is 0.006% at the time of tapping. Auxiliary materials and alloys are added when 1/4 of the steel is tapped. The amount of alloy added per ton of steel is: 6.2 kg/t silicon manganese, 0.92 kg/t ferrosilicon, 1.6 kg/t ferroaluminum, 2.8 kg/t ferrovanadium, and 3.9 kg/t ferromolybdenum. The amount of auxiliary materials added per ton of steel is: 11.3 kg/t limestone, 35 kg/t activated limestone, 19 kg/t dolomite, and 11.2 kg/t sintered ore.
  • (2) LF furnace Use 22000A high current to heat and melt slag.
  • active lime After 5 minutes, take the first sample for chemical composition analysis.
  • the alloy and carbon nitrate carburizer should be added to the argon flow to promote rapid melting and homogenization of the alloy and carbon nitrate carburizer.
  • the molten steel temperature reaches 1592°C, add 1.5kg/t diffusion deoxidizer for diffusion deoxidation. Close the furnace door for 10 minutes.
  • Continuous casting continuous casting at 1532°C, platform temperature at 1565°C, casting speed at 0.42m/min, tundish H control at 1.2ppm, crystallizer electromagnetic stirring current at 405A, terminal electromagnetic stirring current at 336A, frequency at 8Hz; full-process protective casting, crystallizer protective slag using medium carbon steel protective slag; lightly press down the second, third, and fourth rollers, with a reduction of 3mm, 4mm, and 4mm respectively; ingot cutting is carried out by a combination of automatic and manual methods, with red steel as the bottom of the continuous casting ingot and upper pressure on the two furnaces to ensure straightness, and the holding time is 35h.
  • Heating process The temperature entering the heating furnace is 460°C, the temperature of the preheating section is required to be 675°C, and the time is 1.4h; the temperature of the heating section 2 is required to be 860°C, and the time is 1.4h; the temperature of the heating section 1 is required to be 1232°C, and the time is 1.3h; the temperature of the soaking section is required to be 1220°C, and the time is 1.3h; the steel tapping temperature is 1200°C.
  • the intermediate billet produced by initial rolling is 268mm high and 232mm wide; the first pass is 229mm high and 245mm wide, the second pass is 192mm high and 235mm wide; the third pass is 200mm high and 195mm wide; the fourth pass is 160mm high and 214.7mm wide; the fifth pass is 168mm high and 174.6mm wide; the sixth pass is 120mm high and 187.6mm wide; the seventh pass is 142mm high and 138.5mm wide; the eighth pass is 111mm high and 151.5mm wide; the ninth pass is 122.04mm high and 122.04mm wide, and the finished product is produced after the 9th pass.
  • Insulation process Steel insulation, pit entry temperature 580°C, pit exit temperature 150°C, insulation time 50h.
  • the steel material after heat preservation is subjected to heat treatment, and the heat treatment comprises the following steps:
  • the chemical composition by mass percentage, is C: 0.34%, Si: 0.26%, Mn: 0.49%, P: 0.010%, S: 0.005%, Cr: 1.10%, Ni: 0.05%, Cu: 0.03%, Mo: 0.25%, V: 0.15%, and the balance is iron and inevitable impurities.
  • (2) LF furnace Use 23000A high current to heat and melt slag.
  • active lime After 5 minutes, take the first sample for chemical composition analysis.
  • the alloy and carbon nitrate carburizer should be added to the argon flow to promote rapid melting and homogenization of the alloy and carbon nitrate carburizer.
  • the molten steel temperature reaches 1592°C, add 1.6kg/t diffusion deoxidizer for diffusion deoxidation. Close the furnace door for 10 minutes.
  • Continuous casting continuous casting at 1532°C, platform temperature at 1565°C, casting speed at 0.42m/min, tundish H control at 1.5ppm, crystallizer electromagnetic stirring current at 404A, terminal electromagnetic stirring current at 335A, frequency at 7Hz; full-process protective casting, crystallizer protective slag using medium carbon steel protective slag; lightly press down the second, third, and fourth rollers, with a reduction of 3mm, 4mm, and 4mm respectively; ingot cutting is carried out by a combination of automatic and manual methods, with red steel as the bottom of the continuous casting ingot and upper pressure on the two furnaces to ensure straightness, and the holding time is 34h.
  • Heating process The temperature entering the heating furnace is 460°C, the temperature of the preheating section is required to be 675°C, and the time is 1.3h; the temperature of the heating section 2 is required to be 860°C, and the time is 1.3h; the temperature of the heating section 1 is required to be 1230°C, and the time is 1.3h; the temperature of the soaking section is required to be 1225°C, and the time is 1.3h; the steel tapping temperature is 1196°C.
  • the intermediate billet produced by initial rolling is 268mm high and 232mm wide; the first pass is 229mm high and 245mm wide, the second pass is 192mm high and 235mm wide; the third pass is 200mm high and 195mm wide; the fourth pass is 160mm high and 214.7mm wide; the fifth pass is 168mm high and 174.6mm wide; the sixth pass is 120mm high and 187.6mm wide; the seventh pass is 142mm high and 138.5mm wide; the eighth pass is 111mm high and 151.5mm wide; the ninth pass is 122.04mm high and 122.04mm wide, and the finished product is produced after the 9th pass.
  • Insulation process Steel insulation, pit entry temperature 585°C, pit exit temperature 145°C, insulation time 52h.
  • the steel material after heat preservation is subjected to heat treatment, and the heat treatment comprises the following steps:
  • the chemical composition by mass percentage, is C: 0.35%, Si: 0.25%, Mn: 0.52%, P: 0.010%, S: 0.004%, Cr: 1.10%, Ni: 0.06%, Cu: 0.04%, Mo: 0.24%, V: 0.14%, and the balance is iron and inevitable impurities.
  • Converter smelting The raw materials are 27% scrap steel and 73% molten iron by mass. The raw materials are oxidized by oxygen and subjected to intense boiling. The tapping temperature is 1690°C, the oxygen supply time is 17 minutes, the operation time is 50 minutes, the final oxygen content is 630ppm, the carbon content is 0.14% and the phosphorus content is 0.006% at the time of tapping. Auxiliary materials and alloys are added when 1/4 of the steel is tapped. The amount of alloy added per ton of steel is: 6.2 kg/t silicon manganese, 0.93 kg/t ferrosilicon, 1.6 kg/t ferroaluminum, 2.8 kg/t ferrovanadium, and 3.9 kg/t ferromolybdenum. The amount of auxiliary materials added per ton of steel is: 11.4 kg/t limestone, 35 kg/t activated limestone, 19 kg/t dolomite, and 11.3 kg/t sintered ore.
  • Continuous casting continuous casting temperature 1533°C, platform temperature 1564°C, casting speed 0.42m/min, tundish H control 1.5ppm, crystallizer electromagnetic stirring current 406A, end electromagnetic stirring current 335A, frequency 7Hz; full process protection casting, crystallizer protective slag uses medium carbon steel protective slag; light pressure is applied to put in the second, third and fourth rollers, the pressure reduction is 3mm, 4mm and 4mm respectively; the billet cutting adopts a combination of automatic and manual methods, the continuous casting billet is made of red steel as the bottom, and the billet from two furnaces is pressed to ensure the straightness, and the holding time is 35h.
  • Heating process The temperature entering the heating furnace is 460°C, the preheating section temperature is required to be 670°C, and the time is 1.4h; the temperature of the heating section 2 is required to be 860°C, and the time is 1.3h; the temperature of the heating section 1 is required to be 1230°C, and the time is 1.3h; the temperature of the soaking section is required to be 1220°C, and the time is 1.3h; the steel tapping temperature is 1197°C.
  • the intermediate billet produced by initial rolling is 268mm high and 232mm wide; the first pass is 229mm high and 245mm wide, the second pass is 192mm high and 235mm wide; the third pass is 200mm high and 195mm wide; the fourth pass is 160mm high and 214.7mm wide; the fifth pass is 168mm high and 174.6mm wide; the sixth pass is 120mm high and 187.6mm wide; the seventh pass is 142mm high and 138.5mm wide; the eighth pass is 111mm high and 151.5mm wide; the ninth pass is 122.04mm high and 122.04mm wide, and the finished product is produced after the 9th pass.
  • Insulation process Steel insulation, pit entry temperature 575°C, pit exit temperature 150°C, insulation time 50h.
  • the chemical composition by mass percentage, is C: 0.34%, Si: 0.25%, Mn: 0.50%, P: 0.010%, S: 0.005%, Cr: 1.10%, Ni: 0.05%, Cu: 0.04%, Mo: 0.24%, V: 0.15%, and the balance is iron and inevitable impurities.
  • Converter smelting The raw materials are 27% scrap steel and 73% molten iron by mass. The raw materials are oxidized by oxygen and boiled vigorously. The tapping temperature is 1690°C, the oxygen supply time is 17min, the operation time is 50min, the final oxygen content is 630ppm, the C content at the time of tapping is 0.14%, and the P content is 0.14%. The concentration of the steel is 0.005%. Auxiliary materials and alloys are added when 1/4 of the steel is tapped.
  • the intermediate billet produced by initial rolling is 268mm high and 232mm wide; the first pass is 229mm high and 245mm wide, the second pass is 192mm high and 235mm wide; the third pass is 200mm high and 195mm wide; the fourth pass is 160mm high and 214.7mm wide; the fifth pass is 168mm high and 174.6mm wide; the sixth pass is 120mm high and 187.6mm wide; the seventh pass is 142mm high and 138.5mm wide; the eighth pass is 111mm high and 151.5mm wide; the ninth pass is 122.04mm high and 122.04mm wide, and the finished product is produced after the 9th pass.
  • the steel material after heat preservation is subjected to heat treatment, and the heat treatment comprises the following steps:
  • the inspection results of the finished products of Examples 1 to 5 are as follows: 2 samples were inspected for each heat of steel.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Un procédé de fabrication et de préparation d'une barre d'acier pour une roue de turbine à vapeur est divulgué dans la présente invention. La barre d'acier comprend les composants chimiques suivants, en pourcentages en poids : C : 0,31 à 0,36 %, Si : 0,22 à 0,35 %, Mn : 0,45 à 0,60 %, P : ≤ 0,013 %, S : ≤ 0,008 % ; Cr : 1,05 à 1,20 %, Ni : ≤ 0,20 %, Cu : ≤ 0,10 %, Mo : 0,21 à 0,28 % et V : 0,11 à 0,18 %. Le procédé comprend : fusion en convertisseur → affinage LF → affinage RH → coulée continue → processus de chauffage en four de chauffage → processus de laminage → processus de conservation de la chaleur. La présente invention satisfait aux exigences de qualité d'une barre d'acier pour une roue de turbine à vapeur, et des paramètres, tels que des propriétés mécaniques, une dureté élevée et une pureté d'acier élevée, peuvent également satisfaire à des exigences de haut niveau.
PCT/CN2024/086330 2024-03-29 2024-04-07 Procédé de fabrication et de préparation de barre d'acier pour roue de turbine à vapeur Pending WO2025200042A1 (fr)

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