CN113373374B - 1100 MPa-grade magnet yoke steel for manufacturing hydro-generator rotor and production method - Google Patents
1100 MPa-grade magnet yoke steel for manufacturing hydro-generator rotor and production method Download PDFInfo
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- CN113373374B CN113373374B CN202110575162.8A CN202110575162A CN113373374B CN 113373374 B CN113373374 B CN 113373374B CN 202110575162 A CN202110575162 A CN 202110575162A CN 113373374 B CN113373374 B CN 113373374B
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—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
-
- 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
Abstract
A1100 MPa-grade magnet yoke steel for manufacturing a hydraulic generator rotor comprises the following chemical components in percentage by weight: c: 0.15 to 0.25%, Si: 0.25 to 0.35%, Mn: 1.00-1.40%, P: less than or equal to 0.015 percent, S: less than or equal to 0.002%, B: 0.0010-0.0015%, Als: 0.02-0.10%, RE: 0.10-0.20%; the production method comprises the following steps: continuously casting into a blank after smelting in a converter and refining by LF and RH; heating a casting blank; hot rolling after descaling; laminar cooling; coiling; quenching; tempering; naturally cooling to room temperature. The yield strength of the invention is more than or equal to 1100MPa, the tensile strength is more than or equal to 1150MPa, the elongation is more than or equal to 12 percent, and the magnetic induction property B50The steel is more than or equal to 1.6T, has simple elements and lower production cost, and can completely meet the requirement of the steel for the rotor yoke of the hydraulic generator with the required yield strength of more than 1100MPa for the single model capacity of 110 ten thousand kilowatts.
Description
Technical Field
The invention relates to steel for a motor and a production method thereof, in particular to steel for a magnetic yoke of a hydraulic generator rotor and a production method thereof, which are more suitable for the use of a hydraulic generator rotor with the single machine capacity of 110 ten thousand kilowatts.
Background
The rotor magnetic yoke in the hydraulic generator structure is one of the most core components, and the main function of the hydraulic generator structure is to generate rotational inertia and hang and install magnetic poles, and is also a part of a magnetic circuit. High strength, high precision and good magnetic properties are required. With the large-scale development of hydroelectric engineering, the rotor volume is continuously increased, and the safety performance requirement is also continuously improved, so that higher requirements are also provided for the strength of the magnetic yoke steel.
After retrieval:
the Chinese patent application No. ZL201711087052.7 describes 'an ultrahigh strength magnet yoke steel and a manufacturing method thereof', and the ultrahigh strength magnet yoke steel comprises the following chemical components in percentage by weight: 0.10 to 0.15, Si: less than or equal to 0.15, Mn: 1.85-2.00, P: 0.015 or less, S: less than or equal to 0.010, Ti: 0.20 to 0.30, Nb: 0.05 to 0.07, Mo: 0.35-0.55, B: 0.001 to 0.003, Als: 0.02-0.10, N: less than or equal to 0.010 percent, and the balance of Fe and inevitable impurities. After the steel plate is subjected to controlled rolling and controlled cooling treatment, the yield strength of the steel plate can only reach 900MPa, and the requirement of a single-machine capacity 110 ten thousand kilowatts hydraulic generator rotor on 1100MPa ultrahigh-strength magnet yoke steel cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a magnetic induction material B with yield strength of more than or equal to 1100MPa, tensile strength of more than or equal to 1150MPa, elongation of more than or equal to 12 percent and magnetic induction performance50The yield strength 1100 MPa-level magnetic yoke steel which is more than or equal to 1.6T and is used for manufacturing a hydro-generator rotor with the single-machine capacity of 110 kilo-kilowatts and the production method thereof.
The measures for realizing the aim are as follows:
a1100 MPa-grade magnet yoke steel for manufacturing a hydraulic generator rotor comprises the following chemical components in percentage by weight: c: 0.15 to 0.25%, Si: 0.25 to 0.35%, Mn: 1.00-1.40%, P: less than or equal to 0.015 percent, S: less than or equal to 0.002%, B: 0.0010-0.0015%, Als: 0.02-0.10%, RE: 0.10 to 0.20% by weight, and the balance Fe and inevitable impurities.
Preferably: the weight percentage of RE is 0.16-0.20%.
Preferably: the weight percentage of C is 0.15-0.20%.
Preferably: the weight percentage of the Si is 0.30-0.35%.
A production method of 1100 MPa-grade magnet yoke steel for manufacturing a hydraulic generator rotor comprises the following steps:
1) continuously casting into a blank after smelting in a converter and refining by LF and RH;
2) heating a casting blank at 1230-1280 ℃;
3) carrying out hot rolling after descaling, and carrying out finish rolling at the finish rolling temperature of 800-850 ℃ by adopting the traditional two-stage rolling;
4) carrying out laminar cooling, and cooling to the coiling temperature at the cooling speed of 20-30 ℃/s;
5) coiling, wherein the coiling temperature is controlled to be 500-550 ℃;
6) quenching, wherein the quenching temperature is controlled to be 910-930 ℃;
7) tempering is carried out, the tempering temperature is controlled to be 400-450 ℃, and the temperature is kept for 20-50 min at the temperature;
8) naturally cooling to room temperature.
Preferably: the heating temperature of the casting blank is 1230-1260 ℃.
Preferably: the coiling temperature is 500-543 ℃.
Preferably: the tempering temperature is 400-440 ℃.
The action and mechanism of each element and main process in the invention
Carbon (C) in the present invention: carbon is one of indispensable elements for improving the strength of steel, and the magnetic induction performance of steel is influenced by the carbon content higher than a limited value. Therefore, the carbon content is limited to 0.15-0.25%, the strength of the steel can be improved, and the magnetic induction performance of the steel can be ensured.
Silicon (Si): si has a solid-solution strengthening effect and can improve hardenability. Si can reduce the diffusion speed of carbon in ferrite, so that carbide precipitated during tempering is not easy to aggregate, the tempering stability is improved, the strength and the hardness of steel are improved along with the increase of silicon, and crystal grains are coarsened when the silicon content is higher than a limited value, so that the Si content is controlled to be 0.25-0.35 percent.
Manganese (Mn) of the present invention: manganese can reduce the phase transition temperature of austenite transformed into ferrite, expand the hot working temperature area, be beneficial to refining the ferrite grain size and improve the yield strength and tensile strength of steel. However, if the Mn content is higher than the defined value, the temper brittleness and center segregation of the steel are increased, so the Mn content is controlled to be 1.00-1.40% by the present invention.
Phosphorus (P), sulfur (S) in the present invention: phosphorus is easy to cause segregation in steel, and sulfur is easy to combine with manganese to generate MnS inclusions, which are all unfavorable for strength. Therefore, the invention should minimize the adverse effects of phosphorus and sulfur on the magnetic properties and strength of the steel, and the P, S content of the steel is controlled to be P: 0.015 or less, S: less than or equal to 0.002.
Boron (B) in the present invention: b has the main functions of improving the hardenability of the steel, and boron is taken as a surface active element and is adsorbed on an austenite crystal boundary to delay the transformation from austenite to ferrite, and the segregation of the boron on the austenite crystal boundary hinders the nucleation of the ferrite to be beneficial to the formation of martensite, so that the structure strengthening effect is improved. However, if the content of B is higher than a defined value, hardenability is lowered and eutectic with a low melting point is formed, concentrated at the grain boundaries, thereby causing hot brittleness. Therefore, the boron content of the invention is limited to 0.0010% to 0.0015%.
Rare Earth (RE) in the present invention: the rare earth has obvious solid solution strengthening effect, the solid solution rare earth is mainly distributed in a crystal boundary, the interfacial tension and the interfacial energy are reduced, and the driving force for the growth of crystal grains is reduced, so that the growth of austenite crystal grains is inhibited, and the crystal grains are refined. Meanwhile, the rare earth can promote the precipitation of microalloy elements, enhance the precipitation strengthening effect, and enrich the grain boundary through a diffusion mechanism, thereby reducing the segregation of impurity elements in the grain boundary and strengthening the grain boundary. In addition, the rare earth has better magnetism, can effectively improve the magnetic property of the steel plate, and comprehensively considers that the RE content range of the invention is 0.10-0.20%.
The heating temperature of the casting blank is controlled to be 1230-1280 ℃, because the heating temperature ensures that alloy elements are completely dissolved and fully austenitized, simultaneously improves the uniformity of the temperature of the plate blank, reduces the deformation resistance and the rolling load and is beneficial to rolling the thin-specification magnet yoke steel.
The finishing temperature is controlled to be 800-850 ℃ because the lower finishing temperature can obtain a uniformly refined ferrite structure, and a uniform and fine original structure is provided for subsequent heat treatment, so that higher strength is obtained.
The invention controls the coiling temperature to be 500-550 ℃, and also provides uniform and fine original structure for subsequent heat treatment for further refining grains, thereby obtaining higher strength.
The quenching heating temperature of the invention is 910-930 ℃, namely Ac3+ (70-90) DEG C, and the quenching heating temperature is mainly used for coarsening original austenite grains, reducing the barrier effect of austenite grain boundaries on magnetic domain walls, obtaining good magnetic performance, and simultaneously avoiding oversize structures, thereby obtaining refined quenched martensite structures and improving the strength of steel.
The tempering heating temperature is controlled to be 400-450 ℃ and the heat preservation time is 20-50 min. Supersaturated carbon atoms in the quenched martensite are desolventized to form fine carbide particles through a tempering process, the strength of the steel plate is further improved, the plasticity of the steel is improved, the carbide particles grow rapidly when the tempering temperature is too high or the heat preservation time is too long, and the yield strength of the steel plate can be obviously reduced. And comprehensively considering the strength and the plasticity, finally setting the tempering heating temperature to be 400-450 ℃ and the heat preservation time to be 20-50 min.
Compared with the prior art, the invention has yield strength of more than or equal to 1100MPa, tensile strength of more than or equal to 1150MPa, elongation of more than or equal to 12 percent and magnetic induction property B50The yield strength of the yoke steel is more than or equal to 1.6T, and the requirement of 1100MPa grade yoke steel for manufacturing a hydro-generator rotor with the single-machine capacity of 110 ten thousand kilowatts can be met.
Detailed Description
The present invention is described in detail below:
table 1 is a list of values of the components of each example and comparative example of the present invention;
table 2 is a list of process parameter values and performance tests for each example and comparative example of the present invention.
The preparation method comprises the following steps:
1) continuously casting into a blank after smelting in a converter and refining by LF and RH;
2) heating a casting blank at 1230-1280 ℃;
3) carrying out hot rolling after descaling, and carrying out finish rolling at the finish rolling temperature of 800-850 ℃ by adopting the traditional two-stage rolling;
4) carrying out laminar cooling, and cooling to the coiling temperature at the cooling speed of 20-30 ℃/s;
5) coiling, wherein the coiling temperature is controlled to be 500-550 ℃;
6) quenching, wherein the quenching temperature is controlled to be 910-930 ℃;
7) tempering is carried out, the tempering temperature is controlled to be 400-450 ℃, and the temperature is kept for 20-50 min at the temperature;
8) and naturally cooling to room temperature.
TABLE 1 list of chemical compositions (wt%) of inventive and comparative examples
TABLE 2 Main Process parameters and Performance test List for inventive and comparative examples
As can be seen from the results in the above Table 2, the yield strength of the steel of the invention is not less than 1100MPa, the tensile strength is not less than 1150MPa, the elongation is not less than 12%, and the magnetic induction property B50The yield strength of the yoke steel is more than or equal to 1.6T, and the requirement of 1100MPa grade yoke steel for manufacturing a hydro-generator rotor with the single-machine capacity of 110 ten thousand kilowatts can be met.
The above examples are merely preferred examples and are not intended to be exhaustive of the invention.
Claims (3)
1. The 1100 MPa-grade magnet yoke steel for manufacturing the hydro-generator rotor comprises the following chemical components in percentage by weight: c: 0.15 to 0.25%, Si: 0.31 to 0.35%, Mn: 1.26-1.40%, P: less than or equal to 0.015 percent, S: less than or equal to 0.002%, B: 0.0010-0.0014%, Als: 0.05-0.10%, RE: 0.10-0.20%, and the balance of Fe and inevitable impurities;
the production method comprises the following steps:
1) continuously casting into a blank after smelting in a converter and refining by LF and RH;
2) heating a casting blank at 1253-1280 ℃;
3) carrying out hot rolling after descaling, and carrying out finish rolling at the finish rolling temperature of 800-850 ℃ by adopting the traditional two-stage rolling;
4) carrying out laminar cooling, and cooling to the coiling temperature at the cooling speed of 20-30 ℃/s;
5) coiling, wherein the coiling temperature is controlled to be 500-550 ℃;
6) quenching, wherein the quenching temperature is controlled to be 910-930 ℃;
7) tempering is carried out, the tempering temperature is controlled to be 400-445 ℃, and the temperature is kept for 20-50 min at the temperature;
8) naturally cooling to room temperature.
2. A production method of 1100MPa grade yoke steel for manufacturing a hydro-generator rotor according to claim 1, comprising the steps of:
1) continuously casting into a blank after smelting in a converter and refining by LF and RH;
2) heating a casting blank at 1253-1280 ℃;
3) carrying out hot rolling after descaling, and carrying out finish rolling at the finish rolling temperature of 800-850 ℃ by adopting the traditional two-stage rolling;
4) carrying out laminar cooling, and cooling to the coiling temperature at the cooling speed of 20-30 ℃/s;
5) coiling, wherein the coiling temperature is controlled to be 500-550 ℃;
6) quenching, wherein the quenching temperature is controlled to be 910-930 ℃;
7) tempering is carried out, the tempering temperature is controlled to be 400-445 ℃, and the temperature is kept for 20-50 min at the temperature;
8) naturally cooling to room temperature.
3. The production method of 1100MPa grade yoke steel for manufacturing a hydro-generator rotor according to claim 2, characterized in that: the coiling temperature is 500-543 ℃.
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| CN202110575162.8A CN113373374B (en) | 2021-05-26 | 2021-05-26 | 1100 MPa-grade magnet yoke steel for manufacturing hydro-generator rotor and production method |
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| CN202110575162.8A CN113373374B (en) | 2021-05-26 | 2021-05-26 | 1100 MPa-grade magnet yoke steel for manufacturing hydro-generator rotor and production method |
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| CN113373374B true CN113373374B (en) | 2022-06-10 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840723A (en) * | 2005-03-30 | 2006-10-04 | 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 |
| CN107794448A (en) * | 2017-11-07 | 2018-03-13 | 武汉钢铁有限公司 | A kind of high-strength steel sheet and its manufacture method with excellent magnetic energy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1840723A (en) * | 2005-03-30 | 2006-10-04 | 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 |
| CN107794448A (en) * | 2017-11-07 | 2018-03-13 | 武汉钢铁有限公司 | A kind of high-strength steel sheet and its manufacture method with excellent magnetic energy |
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