SE2351299A1 - 1000MPa-level Magnetic Yoke Steel for Fabricating Hydro-generator Rotor and Production Method - Google Patents
1000MPa-level Magnetic Yoke Steel for Fabricating Hydro-generator Rotor and Production MethodInfo
- Publication number
- SE2351299A1 SE2351299A1 SE2351299A SE2351299A SE2351299A1 SE 2351299 A1 SE2351299 A1 SE 2351299A1 SE 2351299 A SE2351299 A SE 2351299A SE 2351299 A SE2351299 A SE 2351299A SE 2351299 A1 SE2351299 A1 SE 2351299A1
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- Prior art keywords
- mpa
- hydro
- temperature
- equal
- magnetic yoke
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 238000005496 tempering Methods 0.000 claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 238000010791 quenching Methods 0.000 claims abstract description 9
- 230000000171 quenching effect Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 229910052796 boron Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000005098 hot rolling Methods 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 5
- 230000006698 induction Effects 0.000 abstract description 6
- 239000011572 manganese Substances 0.000 description 10
- 229910052761 rare earth metal Inorganic materials 0.000 description 10
- 150000002910 rare earth metals Chemical class 0.000 description 10
- 229910001566 austenite Inorganic materials 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000006104 solid solution Substances 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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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- 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
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/04—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C21D2211/001—Austenite
-
- 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
- C21D2211/004—Dispersions; Precipitations
-
- 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
- C21D2211/008—Martensite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
1000 MPa-level magnetic yoke steel for fabricating a hydro-generator rotor includes chemical components by wt%: 0.15% to 0.25% C, 0.15% to 0.25% Si, 1.00% to 1.35% Mn, less than or equal to 0.015% P, less than or equal to 0.002% S, 0.0010% to 0.0015% B, 0.02% to 0.10% Als, and 0.10% to 0.20% RE. A production method: performing continuous casting to form a casting blank after converter smelting and LF+RH refining; heating the casting slab; performing hot rolling after descaling; performing laminar cooling; performing coiling; performing quenching; performing tempering; and performing natural cooling to a room temperature. The present disclosure has a yield strength being greater than or equal to 1000 MPa, a tensile strength being greater than or equal to 1050 MPa, an elongation being greater than or equal to 12% and a magnetic induction property Bso being greater than or equal to 1,6T, has simple elements, is low in production cost and can completely meet the requirement for the magnetic yoke steel for a hydro-generator rotor with a required yield strength of 1000 MPa or above and with power per unit being 1 million kilowatts.
Description
TECHNICAL FIELD The present disclosure relates to steel for a motor and a production method, belongs exactly to magnetic yoke steel of a hydro-generator rotor and a production method, and is more suitable for use of a hydro-generator rotor at l million kiloWatts.
BACKGROUND A rotor magnetic yoke is one of core parts in a hydro-generator structure, With main functions as generating rotational inertia and mounting a magnetic pole in a hanging mode, and also serves as a part of a magnetic circuit. High strength, high precision and good magnetic property are required. With large-scale development of a hydropower project, the size of a rotor is constantly increased, a safety performance requirement is constantly increased, and thus higher strength is also required for magnetic yoke steel.
Through retrieval, a Chinese patent application No. ZL20l7l l087052.7 records "ultrahigh-strength magnetic yoke steel and a fabrication method therefor", and the ultra-high-strength magnetic yoke steel includes chemical components in percentage by Weight: 0.l0% to 0.l5% C, less than or equal to 0.l5% Si, l.85% to 2.00% Mn, less than or equal to 0.0l5% P, less than or equal to 0.0l0% S, 0.20% to 0.30% Ti, 0.05% to 0.07% Nb, 0.35% to 0.55% Mo, 0.00l% to 0.003% B, 0.02% to 0.l0% Als, less than or equal to 0.0l0% N, the balance of Fe and incidental impurities. A steel plate, after being subjected to a controlled rolling and cooling treatment, has a yield strength of only 900 MPa, Which cannot meet a requirement of a hydro-generator rotor With power per unit being l million kiloWatts for l000 MPa ultrahigh-strength magnetic yoke steel.
SUMMARY In order to overcome defects in the prior art, the present disclosure provides magnetic yoke steel With a yield strength of 1000 MPa level for fabricating a hydro-generator rotor With power per unit being 1 million kiloWatts and a production method. The magnetic yoke steel has a yield strength being greater than or equal to 1000 MPa, a tensile strength being greater than or equal to 1050 MPa, an elongation being greater than or equal to 12% and a magnetic induction property B50 being greater than or equal to 1.6T.
Measures for achieving the above objectives are as follows: 1000 MPa-level magnetic yoke steel for fabricating a hydro-generator rotor includes chemical components in percentage by Weight: 0,15% to 0,25% C, 0,15% to 0,25% Si, 1,00% to 1,35% Mn, less than or equal to 0.015% P, less than or equal to 0,002% S, 0.0010% to 0.0015% B, 0,02% to 0,10% Als, 0,10% to 0,20% RE, the balance of Fe and incidental impurities, Preferably, the percentage of RE is in a range from 0,14% to 0,19% by Weight, Preferably, the percentage of Mn is in a range from 1,00% to 1,32% by Weight, A production method for 1000 MPa-level magnetic yoke steel for fabricating hydro- generator rotor includes steps: 1) performing continuous casting to form a casting blank after converter smelting and LF+RH refining; 2) heating the Casting blank in a temperature of ranging from l230°C to l280°C; 3) performing hot rolling after descaling, adopting conventional two-stage rolling, and perforrning finishing rolling in a temperature of ranging from 8l5°C to 850°C; 4) perforrning laminar cooling to a coiling temperature at a cooling Velocity of ranging from 20°C/s to 30°C/s; ) perforrning coiling With a coiling temperature controlled in a range from 450°C to 500°C; 6) perforrning quenching With a quenching temperature controlled in a range from 9l0°C to 930°C; 7) perforrning tempering With a tempering temperature controlled in a range from 45 0°C to 500°C, and maintaining the temperature for 20 min to 50 min; and 8) perforrning natural cooling to an indoor temperature.
Preferably, the casting slab is heated in a temperature of ranging from l236°C to l268°C.
Preferably, the coiling temperature is in a range from 462°C to 483°C.
Preferably, the tempering temperature is in a range from 45 7°C to 488°C.
Functions and mechanisms of all elements and main processes in the present disclosure: Carbon (C) in the present disclosure has a content of ranging from 0.15% to 0.25%. Carbon is one of indispensable elements in steel for improving strength, and magnetic induction of steel may be affected due to too high carbon content. The carbon content is limited in a range from 0.15% to 0.25%, Which may both improve the steel strength and guarantee the magnetic induction property of steel.
Silicon (Si) in the present disclosure has a content of ranging from 0.15% to 0.20%. Si has an effect of solid solution strengthening and may improve hardenability. Si can reduce diffusion Velocity of carbon in ferrite, so the carbide precipitated during tempering is not prone to aggregation, and tempering stability is improved. The strength and hardness of the steel can be improved With the increase of silicon, but the grains Will be coarsened When the silicon content exceeds a certain range, and thus the present disclosure controls the Si content in a range from 0.15% to 0.20%.
A content of manganese (Mn) in the present disclosure is in a range from 1.00% to 1.35%. Mn may reduce a phase-transition temperature of converting austenite into ferrite and hot Working temperature region is Widened, so the grain size of the ferrite is better refined, and the yield strength and the tensile strength of the steel are improved. HoWever, if the Mn content is too high, temper brittleness and center segregation of the steel may be increased, so the present disclosure controls the Mn content in a range from 1.00% to 1.35%, preferably, the percentage of Mn is in a range from l.00% to 132% by Weight.
The present disclosure has phosphorus (P) With a content being less than or equal to 0.010% and sulfur (S) With a content being less than or equal to 0.002%, the phosphorus is prone to causing segregation in the steel, and sulfur is prone to being bound to the manganese to form MnS impurities, which is unfavorable for the strength. Thus, the present disclosure is supposed to reduce an adverse influence of phosphorus and sulfur elements on a magnetic property and strength of steel, and controls the P content of the steel to be less than or equal to 0.0l5% and the S content of the steel to be less than or equal to 0.002%.
Boron (B) in the present disclosure has a content of ranging from 0.00l0% to 0.00l5%, with main functions as improving hardenability of the steel, and boron, as a surface- active element, is adsorbed to an austenite grain boundary, delays transition of austenite to ferrite and prevents nucleation of the ferrite due to its segregation on the austenite grain boundary so as to benefit forrning of martensite, so that a structure strengthening effect is improved. However, if the B content is too high, hardenability is reduced, low- melting-point eutectics may be formed and gathered at the grain boundary, and thus hot brittleness is caused. Thus, the boron content in the present disclosure is in a range from 0.00l0% to 0.00l5%.
Rare earth (RE) in the present disclosure has a remarkable solid solution strengthening effect. Solid solution rare earth is mainly distributed at a grain boundary, an interfacial tension and interfacial energy are reduced, a driving force of grain growth is reduced, thus austenite grain growth is inhibited, and then grains are ref1ned. Meanwhile, the rare earth may facilitate separation of microalloy elements, a separation strengthening effect is enhanced, the rare earth is gathered in the grain boundary through a diffusion mechanism, segregation of impurity elements at the grain boundary is reduced, and the grain boundary is enhanced. Besides, the rare earth has good magnetism and may effectively improve the magnetic property of the steel plate, and through overall consideration, the RE content in the present disclosure is in a range from 0.l0% to 0.20%.
The heating temperature of the present disclosure is in a range from l230°C to l280°C. Preferably, the casting slab is heated in a temperature of ranging from 123 6°C to l268°C. Alloy elements complete solid solution and full austenizing are guaranteed, meanWhile, temperature uniforrnity of the slab is improved, and deformation resistance and a rolling load are reduced, Which is conducive to rolling magnetic yoke steel With a thin specif1cation.
In the present disclosure, the f1nishing rolling temperature is in a range from 8l5°C to 850°C, and the coiling temperature is in a range from 45 0°C to 500°C, Which are mainly for ref1ning the austenite grains and improving the steel strength after the heat treatment.
The quenching temperature in the present disclosure is in a range from 9l0°C to 930°C, namely, in a range of Ac3+(70-90)°C, Which is mainly for coarsening the original austenite grains, reducing a blocking effect of the austenite grain boundary on a magnetic domain Wall, obtaining good magnetic property, and avoiding too large structure at the same time, so that a ref1ned quenched martensite structure is obtained, and the steel strength is improved.
The tempering temperature in the present disclosure is in a range from 45 0°C to 500°C, and the temperature is maintained for 20 min to 50 min. Through the tempering process, supersaturated carbon atoms in the quenched martensite are desolvated to form thinned carbide particles, the strength of the steel plate is further improved, meanWhile, steel plasticity is improved, and if the tempering temperature exceeds 500°C or the temperature is maintained for too much time, the carbide particles are groWn rapidly, and the yield strength of the steel plate may be reduced remarkably. Through comprehensively considering the strength and plasticity, the tempering heating temperature is finally set to be in a range from 450°C to 500°C, and the temperature is maintained for 20 min to 50 min, preferably, the tempering temperature is in a range from 457°C to 488°C.
The reason that the present disclosure controls the heating temperature of the casting blank to be in a range from 1230°C to 1280°C is that alloy element complete solid solution and full austenizing are guaranteed, meanwhile, temperature uniforrnity of a plate blank is improved, and the deformation resistance and the rolling load are reduced, which is conducive to rolling magnetic yoke steel with a thin specification.
Compared with the prior art, the present disclosure provides the magnetic yoke steel with a yield strength of 1000 MPa level for fabricating a hydro-generator rotor with power per unit being 1 million kilowatts and the production method. The magnetic yoke steel has the yield strength being greater than or equal to 1000 MPa, the tensile strength being greater than or equal to 1050 MPa, the elongation being greater than or equal to 12% and the magnetic induction property B50 being greater than or equal to 1.6T.
DETAILED DESCRIPTION The present disclosure is described in detail below.
Table 1 is a list of values of components in each embodiment in the present disclosure and each comparative example.
Table 2 is a list of process parameters and performance tests in each embodiment in the present disclosure and each comparative example.
Each embodiment in the present disclosure is produced according to the following steps: 1) continuous casting is performed to form a casting blank after converter smelting and LF+RH refining; 2) the casting slab is heated in a temperature of ranging from l230°C to 1280°C; 3) hot rolling is performed after descaling, conventional tWo-stage rolling is adopted, and finishing rolling is performed in a temperature of ranging from 8l5°C to 850°C; 4) laminar cooling is performed to a coiling temperature at a cooling Velocity of ranging from 20°C/s to 30°C/s; ) coiling is performed With a coiling temperature controlled in a range from 450°C to 500°C; 6) quenching is performed With a quenching temperature controlled in a range from 910°C to 930°C; 7) tempering is performed With a tempering temperature controlled in a range from 450°C to 500°C, and the temperature is maintained for 20 min to 50 min; and 8) natural cooling is performed to an indoor temperature.
Table 1 List of chemical components in each embodiment in the present disclosure and each comparative example (Wt%) Embodiment C Mn Si P S Als B RE 1 0.16 1.35 0.16 0.015 0.001 0.02 0.0015 0.18 2 0.15 1.22 0.15 0.009 0.002 0.03 0.0010 0.10 3 0.18 1.00 0.25 0.008 0.001 0.08 0.0012 0.20 4 0.20 1.12 0.18 0.007 0.002 0.05 0.0013 0.15 0.25 1.28 0.21 0.010 0.001 0.07 00014 0.16 6 0.17 1.26 0.22 0.011 0.002 0.10 0.0015 0.19 7 0.19 1.17 0.19 0.012 0.002 0.04 0.0011 0.14 8 0.16 1.19 0.17 0.013 0.001 0.06 0.0012 0.18 9 0.21 1.24 0.19 0.014 0.002 0.05 0.0014 0.17 0.22 1.25 0.23 0.010 0.002 0.09 0.0013 0.12 Cmnpafative 0.30 0.75 0.09 0.018 0.004 0.01 0.0006 _ example 1 Cmnpafative 0.08 1.80 0.35 0.020 0.005 0.15 0.0031 0.28 example 2 Table 2 List of main process parameters and performance test in each embodiment in the present disclosure and each comparative example Casting Finishing _ _ Quenching Tempefing Telnpeffillg _ _ _ Magnçtic _ Slab heating Tolling Co1l1ng temperature temperature ma1nta1n1ng Yield Tens1le Elongation 1nduct1on Embodiment mm Granne mm Granne temperature °C °C temperature strength strength A strength POC POC °c time MP6 MP6 % B56 min T 1 1280 828 450 930 450 50 1034 1092 13 1.61 2 1230 800 500 923 468 34 1045 1099 13 1.60 3 1265 843 464 910 500 20 1024 1089 13 1.62 4 1253 834 483 914 457 37 1026 1092 14 1.60 1248 815 479 925 498 29 1035 1094 14 1.62 6 1261 850 462 926 475 28 1029 1083 13 1.61 7 1268 832 494 920 450 20 1034 1089 14 1.61 8 1255 845 468 910 437 38 1026 1093 13 1.61 9 1247 838 469 926 428 24 1029 1095 13 1.60 1273 829 462 928 445 27 1039 1086 13 1.62 Cmnpafative 1183 790 385 870 400 10 798 842 10 1.42 exarnple 1 Cmnpafative 1326 894 621 950 600 100 841 929 10 1.43 exarnple 2 It may be seen from the results in Table 2 that the steel in the present disclosure has the yield strength being greater than or equal to 1000 MPa, the tensile strength being greater than or equal to 1050 MPa, the elongation being greater than or equal to 12% and the magnetic induction property B50 being greater than or equal to 1.6T, and can completely n1eet the requirenient for fabricating a hydro-generator rotor With power per unit being l million kiloWatts.
The above enibodinients are only best examples but not all technical solutions of the present disclosure.
Claims (8)
1.) perforrning continuous casting to forrn a casting slab after converter smelting and LF+RH refining;
2.) heating the casting slab in a temperature of ranging from 1230°C to 1280°C;
3.) perforrning hot rolling after descaling, adopting conventional tWo-stage rolling, and perforrning f1nishing rolling in a temperature of ranging from 815°C to 850°C;
4.) perforrning laminar cooling to a coiling temperature at a cooling Velocity of ranging from 20°C/s to 30°C/s;
5.) perforrning coiling With a coiling temperature controlled in a range from 450°C to 500°C;
6.) performing quenching With a quenching temperature controlled in a range from 9l0°C to 930°C;
7.) perforrning tempering With a tempering temperature controlled in a range from 45 0°C to 500°C, and maintaining the temperature for 20 min to 50 min; and
8.) performing natural cooling to an indoor temperature. 5. The production method for the 1000 MPa-level magnetic yoke steel for fabricating the hydro-generator rotor of claim 4, characterized in that the casting slab is heated in a temperature of ranging from l236°C to l268°C. 6. The production method for the 1000 MPa-level magnetic yoke steel for fabricating the hydro-generator rotor of claim 4, characterized in that the coiling temperature is in a range from 462°C to 483°C. 7. The production method for the 1000 MPa-level magnetic yoke steel for fabricating the hydro-generator rotor of claim 4, characterized in that the tempering temperature is in a range from 457°C to 488°C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110575163.2A CN113430451B (en) | 2021-05-26 | 2021-05-26 | 1000 MPa-grade magnet yoke steel for manufacturing hydro-generator rotor and production method |
| PCT/CN2022/094198 WO2022247752A1 (en) | 2021-05-26 | 2022-05-20 | 1000 mpa grade magnetic yoke steel for manufacturing rotor of hydroelectric generator, and production method |
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| SE2351299A1 true SE2351299A1 (en) | 2023-11-14 |
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| SE2351299A SE2351299A1 (en) | 2021-05-26 | 2022-05-20 | 1000MPa-level Magnetic Yoke Steel for Fabricating Hydro-generator Rotor and Production Method |
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| CN (1) | CN113430451B (en) |
| SE (1) | SE2351299A1 (en) |
| WO (1) | WO2022247752A1 (en) |
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| CN113430451B (en) * | 2021-05-26 | 2022-06-10 | 武汉钢铁有限公司 | 1000 MPa-grade magnet yoke steel for manufacturing hydro-generator rotor and production method |
| CN116287994A (en) * | 2023-03-03 | 2023-06-23 | 武汉钢铁有限公司 | Excellent plate-shaped ultra-high-strength girder steel with yield strength more than or equal to 1000MPa and production method |
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|---|---|---|---|---|
| JP4060407B2 (en) * | 1997-08-22 | 2008-03-12 | 日新製鋼株式会社 | Method for producing soft magnetic stainless steel sheet for motor yoke |
| CN100372962C (en) * | 2005-03-30 | 2008-03-05 | 宝山钢铁股份有限公司 | Superhigh strength steel plate with yield strength more than 1100Mpa and method for producing same |
| CN107794448B (en) * | 2017-11-07 | 2020-01-31 | 武汉钢铁有限公司 | high-strength steel sheets with excellent magnetic properties and method for producing same |
| CN113430451B (en) * | 2021-05-26 | 2022-06-10 | 武汉钢铁有限公司 | 1000 MPa-grade magnet yoke steel for manufacturing hydro-generator rotor and production method |
-
2021
- 2021-05-26 CN CN202110575163.2A patent/CN113430451B/en active Active
-
2022
- 2022-05-20 SE SE2351299A patent/SE2351299A1/en unknown
- 2022-05-20 WO PCT/CN2022/094198 patent/WO2022247752A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN113430451B (en) | 2022-06-10 |
| CN113430451A (en) | 2021-09-24 |
| WO2022247752A1 (en) | 2022-12-01 |
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