CN113549834B - Weather-resistant steel for bogie frame and preparation method thereof - Google Patents
Weather-resistant steel for bogie frame and preparation 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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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—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
- C22C38/18—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
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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
- C22C38/18—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
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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
- C22C38/18—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
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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 provides a weathering steel for a bogie frame and a preparation method thereof, wherein the weathering steel for the bogie frame comprises, by weight, 0.14-0.16% of C, 0.40-0.65% of Si, 0.40-0.65% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.45-0.60% of Cu, 0.90-1.20% of Cr, 0.80-1.20% of Ni, 0.08-0.12% of V, 0.40-0.60% of Mo, 0.010-0.045% of Alt, and the balance of Fe and inevitable impurities. The weathering steel for the high-speed rail bogie frame, which has excellent tensile property, low-temperature welding property, low-temperature fatigue property and low-temperature impact property, particularly good corrosion resistance, is obtained by reasonable component addition and comprehensive rolling and cooling control technology.
Description
Technical Field
The invention belongs to the technical field of alloy steel smelting, particularly relates to weathering steel for a bogie frame and a preparation method thereof, and more particularly relates to weathering steel for a bogie frame of a high-speed rail motor train unit in a high and cold area and a preparation method thereof.
Background
The bogie frame is one of the most important parts of a railway vehicle, and not only directly bears the weight from a vehicle body, but also ensures that the vehicle runs smoothly on a straight line and a curve. Due to the various irregularities of the track line, the bogie is subjected to various impacts from the track when running thereon, these impact loads are directly transmitted to the frame through the wheel set and a series of suspension devices, and in addition to the motor and the gear box and the braking loads, the frame is subjected to complex alternating bending and tension-compression loads during the running of the bogie and may be in service in alpine regions. Therefore, in selecting a truck frame material, the material must have good mechanical properties, welding properties, and fatigue properties. Moreover, corrosion problems caused by broad members in China, south China and coastal humid and rainy areas also cause great hidden dangers to driving safety, so that the steel for the bogie frame of the high-speed rail motor train unit is required to have good corrosion resistance.
At present, all steels for the bogie of the high-speed rail motor train unit in China adopt foreign imported materials, and mainly comprise European S355J2W steel and Japanese SMA490BW steel. The steel for the foreign bogie is high in price and has certain restriction risk. Once the steel export for the high-speed railway bogie in China is controlled abroad, unpredictable loss is brought to the rejuvenated motor train unit brand in China. So far, the steel for domestic bogie is only limited to be used on common passenger car vehicles with the highest operating speed not more than 160km/h, and the application on high-speed railway motor train units is still blank.
The Chinese patent application CN111321350A discloses a 16MnDR steel plate for a railway bogie and a manufacturing method thereof. The steel plate produced by the method can only meet the performance requirement of the steel for the bogie of the electric locomotive of the power concentrated motor train unit with the speed of 160km/h, and the 16MnDR is originally a low-temperature pressure vessel steel plate, only the improvement of the low-temperature performance by controlling the Ni content is considered in the component design, the corrosion resistance problem required to be solved in the practical application is not considered, and the mechanical performance and the fatigue resistance performance of the steel plate are not satisfactory.
Chinese patent application CN110029279A discloses steel with yield strength of 390MPa level for a high-speed rail bogie frame and a preparation method thereof. The steel has poor mechanical properties, and the fatigue performance and the corrosion resistance are not characterized.
Disclosure of Invention
The invention aims to provide the weathering steel for the bogie frame and the preparation method thereof, and the weathering steel improves the low-temperature toughness, the corrosion resistance and the fatigue resistance of the existing weathering steel for the bogie frame through reasonable component addition and comprehensive refining technology.
The technical scheme for realizing the above purpose of the invention is as follows:
on one hand, the invention provides weather-resistant steel for a bogie frame, which comprises, by weight, 0.14-0.16% of C, 0.40-0.65% of Si, 0.40-0.65% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.45-0.60% of Cu, 0.90-1.20% of Cr, 0.80-1.20% of Ni, 0.08-0.12% of V, 0.40-0.60% of Mo, 0.010-0.045% of Alt, and the balance of Fe and inevitable impurities.
Preferably, in the weathering steel for the bogie frame, Si is 0.40-0.50% by weight.
Preferably, in the weathering steel for bogie frames, Mn is 0.40-0.55% by weight.
Preferably, in the weathering steel for the bogie frame, P is less than or equal to 0.010 percent by weight.
Preferably, in the weathering steel for the bogie frame, S is less than or equal to 0.008 percent by weight.
Preferably, the Cu content of the weathering steel for bogie frame is 0.45-0.50% by weight.
Preferably, in the weathering steel for bogie frames, Mo is 0.40-0.50% by weight.
Preferably, in the weather-resistant steel for the bogie frame, Alt is 0.020-0.035% by weight.
In a preferred embodiment, the weathering steel for truck frames comprises: 0.14-0.16% of C, 0.40-0.50% of Si, 0.40-0.55% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 0.45-0.50% of Cu, 0.90-1.20% of Cr, 0.80-1.20% of Ni, 0.08-0.12% of V, 0.40-0.50% of Mo, 0.020-0.035% of Alt, and the balance of Fe and inevitable impurities.
Preferably, the weathering steel for truck frames according to the present invention has a structure characterized by fine ferrite and pearlite structures, and a structure grain size of more than 9.0 grade.
Preferably, the inclusion rating of the weathering steel for the bogie frame is that A coarse system is less than or equal to 1.0, and A fine system is less than or equal to 1.5; the coarse line B is less than or equal to 1.0, and the fine line B is less than or equal to 1.5; the coarse content of C is less than or equal to 1.0, and the fine content of C is less than or equal to 1.5; the coarse system D is less than or equal to 1.0, and the fine system D is less than or equal to 1.5; the coarse line (B + C + D) is less than or equal to 1.5, and the fine line (B + C + D) is less than or equal to 3.0.
Preferably, the tensile strength of the weathering steel for the bogie frame is more than or equal to 700MPa, the yield strength is more than or equal to 550MPa, and the elongation after fracture is more than or equal to 18 percent; according to TB/T2375, the cycle infiltration corrosion rate relative to Q345B is less than or equal to 50 percent.
Preferably, the weathering steel for bogie frames has a transverse impact property K at-40 DEG CV2≥180J。
Preferably, the tensile and compression fatigue limit of the weather-resistant steel welding joint for the bogie frame at room temperature is more than or equal to 350 MPa; the tensile and compression fatigue limit at-40 ℃ is more than or equal to 450MPa, the fatigue performance of the low-temperature welding joint is good, and the low-temperature brittleness is not generated.
In another aspect, the present invention provides a method for preparing the weathering steel for a bogie frame, including the following steps:
(1) adding the pretreated molten iron and the scrap steel into a furnace, and carrying out converter smelting, ladle refining (LF) and vacuum circulating degassing Refining (RH);
(2) continuously casting steel to obtain a continuous casting slab;
(3) heating and rolling the continuous casting slab obtained in the step (2) into a steel plate;
(4) normalizing the steel plate obtained in the step (3) to obtain the steel plate.
Preferably, the step (1) is: adding the pretreated molten iron and the scrap steel into a furnace for smelting, and then carrying out ladle furnace refining and vacuum furnace degassing refining, wherein clean steel smelting technology is adopted in the procedures of ladle refining (LF) and vacuum cycle degassing Refining (RH);
preferably, in the step (2), the continuous casting steel is cast in the absence of oxidation protection in the whole process, and is matched with solidification tail end soft reduction and electromagnetic stirring, and the trace elements in the steel are fed into the steel by a tundish or a crystallizer, so that the yield of the trace elements can be ensured, and when the trace elements are fed into the crystallizer, the yield of the trace elements is high, but the trace elements have influence on the surface of a casting blank, and the inspection and the cleaning of the casting blank need to be paid attention;
preferably, in the step (2), the tapping temperature is 1560-1570 ℃;
preferably, in the step (2), the casting temperature is 1540-1555 ℃;
preferably, in the step (3), the continuous casting plate blank obtained in the step (2) is heated, sufficiently austenitized, and microalloy elements are sufficiently dissolved in solid solution, wherein the heating temperature is 1250-1280 ℃, and the temperature is kept for 1.5-2 hours, and then the continuous casting plate blank is rolled; preferably, the rolling is carried out in two stages, namely a rough rolling stage and a finish rolling stage, wherein the initial rolling temperature of the rough rolling stage is set to be more than 1100 ℃, the plasticity of steel is good, the strength is low, the rolling is easy, the initial rolling temperature of the finish rolling stage is set to be 1100-980 ℃, and the final rolling temperature is set to be 850-800 ℃;
preferably, in the step (4), the steel plate obtained in the step (3) is normalized, the normalizing heating temperature is 880-930 ℃, preferably 890-910 ℃, the normalizing heat preservation time is 30-60 min, preferably 40-50 min, and the steel plate is cooled in an air cooling mode after heat preservation.
Compared with the prior art, the weathering steel for the bogie frame has the advantages that the steel obtains fine ferrite and pearlite structures by compositely adding elements such as Cr, Ni, Cu, V and the like and a controlled rolling air cooling process, and has excellent low-temperature welding performance, low-temperature fatigue performance and low-temperature impact performance, especially good corrosion resistance.
The addition of Cr and Cu elements enables the steel to obtain excellent corrosion resistance, the Ni element enables the steel to obtain good low-temperature performance, and the V element forms carbon nitride refined grains. And the process is reasonably controlled, the reheating temperature of the slab is controlled to 1250-1280 ℃, and the proper time of the slab in the furnace is controlled, so that the effective diffusion of carbon enriched due to positive segregation in the center of the casting blank can be ensured, the center segregation of a steel plate is reduced, and a banded structure is weakened. Fully utilizing the high-temperature recrystallization zone for rolling to obtain fine and uniform austenite grains, reasonably arranging a reduction system in a low-temperature zone of a partial recrystallization zone, strictly controlling a finish rolling temperature interval and deformation of the last several times, utilizing a strain accumulation effect generated by low-temperature rolling to the maximum extent to obtain a fine grain effect close to that of rolling in a non-recrystallization zone, and promoting austenite donor element phase transformation by quickly cooling after rolling to finally obtain a fine-grain ferrite and pearlite structure. On the premise of improving the corrosion resistance of the steel for the bogie frame, the weathering steel for the bogie frame of the high-speed rail motor train unit, which has excellent low-temperature performance, good microstructure and excellent fatigue performance, is obtained by reasonably adjusting alloy elements and reasonably regulating and controlling the process.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention.
The test methods in the following examples are all conventional methods unless otherwise specified, and the raw materials, materials and the like used in the following examples are all commercially available products unless otherwise specified. The composition of the weathering steel for the bogie frame of the high-speed rail motor train unit in examples 1 to 4 is shown in table 1. Wherein example 1 is outside the scope of the present invention and belongs to the control group.
TABLE 1 composition (wt%, balance Fe and impurities) of weathering steel for bogie frame of high-speed railway motor train unit according to the invention
| Examples | C | Si | Mn | P | S | Cr | Cu | Mo | Ni | V | Alt |
| Example 1 | 0.15 | 0.50 | 0.51 | 0.004 | 0.002 | 0.90 | 0.46 | 0.45 | 0.80 | 0 | 0.03 |
| Example 2 | 0.15 | 0.50 | 0.50 | 0.005 | 0.002 | 0.91 | 0.46 | 0.46 | 0.80 | 0.10 | 0.03 |
| Example 3 | 0.15 | 0.50 | 0.51 | 0.005 | 0.002 | 1.18 | 0.46 | 0.45 | 0.82 | 0.10 | 0.03 |
| Example 4 | 0.15 | 0.50 | 0.50 | 0.005 | 0.002 | 0.90 | 0.47 | 0.44 | 1.19 | 0.10 | 0.03 |
The preparation method of the weathering steel for the bogie frame of the high-speed rail motor train unit in the embodiment 1-4 comprises the following steps:
(1) adding the pretreated molten iron and the scrap steel into a furnace for smelting, and then carrying out ladle furnace refining and vacuum degassing furnace degassing refining, wherein clean steel smelting technology is adopted in the procedures of ladle refining (LF) and vacuum circulating degassing Refining (RH);
(2) continuously casting steel, wherein the tapping temperature is 1565 ℃, the pouring temperature is 1550 ℃, casting blanks with the diameter of 690mm are cast on a continuous casting machine, the whole process of the continuous casting process adopts non-oxidation protection pouring, and is matched with solidification tail end soft reduction and electromagnetic stirring, the addition of trace elements in the steel adopts a crystallizer for feeding, and the inspection and the cleaning of the casting blanks are noticed;
(3) heating the continuous casting plate blank obtained in the step (2) to 1260 ℃, preserving heat for 2 hours, and then rolling, wherein the rolling is carried out in two stages, the initial rolling temperature in the rough rolling stage is set to be more than 1100 ℃, the initial rolling temperature in the finish rolling stage is set to be 1050 ℃, and the final rolling temperature is set to be 850 ℃;
(4) normalizing the hot-rolled steel plate obtained in the step (3), wherein the normalizing heating temperature is 900 ℃, the normalizing heat preservation time is 45min, and cooling in an air cooling mode after heat preservation.
Impact performance of the weathering steel for the bogie frame of the high-speed rail motor train unit prepared by the method in the embodiment 1-4 is determined according to GB/T229-.
Standard technical documents TJ/CL 289-2014 temporary technical conditions for the composition of the bogie frame of the motor train unit do not make requirements on the low-temperature performance and the periodic infiltration corrosion performance of the steel for the bogie frame of S355J2W and the steel for the bogie frame of SMA490BW, and the mechanical property, the impact property, the fatigue property and the periodic infiltration corrosion performance of the steel for the bogie frame of the embodiments 1-4 of the invention are shown in tables 2 and 3.
TABLE 2 examples 1-4 comparison of tensile, impact and fatigue properties of weathering steels for bogie frames
TABLE 3 comparison of corrosion properties of weathering steels for bogie frames of examples 1 to 4
The grain size structure of the steel of the embodiment is higher than 9.0 grade.
In conclusion, the above description of the embodiments of the present invention is not intended to limit the present invention, and those skilled in the art can make various changes or modifications according to the present invention without departing from the spirit of the present invention, which falls within the scope of the appended claims.
Claims (19)
1. The weathering steel for the bogie frame comprises the following elements in percentage by weight: 0.14-0.16% of C, 0.40-0.65% of Si, 0.40-0.65% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.45-0.60% of Cu, 0.90-1.20% of Cr, 0.80-1.20% of Ni, 0.08-0.12% of V, 0.40-0.60% of Mo, 0.010-0.045% of Alt, and the balance of Fe and inevitable impurities;
the preparation method of the weathering steel for the bogie frame comprises the following steps:
(1) adding the pretreated molten iron and the scrap steel into a furnace, and carrying out converter smelting, ladle refining (LF) and vacuum circulating degassing Refining (RH);
(2) continuously casting steel to obtain a continuous casting slab;
(3) heating the continuous casting plate blank obtained in the step (2), fully austenitizing to fully dissolve micro-alloy elements, keeping the heating temperature at 1250-1280 ℃, keeping the temperature for 1.5-2 hours, and then rolling the continuous casting plate blank into a steel plate, wherein the rolling is carried out in two stages, namely a rough rolling stage and a finish rolling stage, the initial rolling temperature of the rough rolling stage is set to be more than 1100 ℃, the plasticity of the steel is good, the strength is low, the rolling is easy, the initial rolling temperature of the finish rolling stage is set to be 1100-980 ℃, and the final rolling temperature is set to be 850-800 ℃;
(4) normalizing the steel plate obtained in the step (3), wherein the normalizing heating temperature is 880-930 ℃, the normalizing heat preservation time is 30-60 min, and cooling in an air cooling mode after heat preservation is carried out to obtain the steel plate.
2. The weathering steel for truck frames according to claim 1, wherein the weathering steel for truck frames has Si of 0.40 to 0.50% by weight.
3. The weathering steel for truck frames according to claim 1, wherein the weathering steel for truck frames has Mn of 0.40 to 0.55% by weight.
4. The weathering steel for bogie frames according to claim 1, wherein P is 0.010% or less in the weathering steel for bogie frames in weight percent.
5. The weathering steel for bogie frames according to claim 1, wherein S is 0.008% or less by weight of the weathering steel for bogie frames.
6. The weathering steel for truck frames according to claim 1, wherein Cu is 0.45 to 0.50% by weight of the weathering steel for truck frames.
7. The weathering steel for truck frames according to claim 1, wherein Mo is 0.40 to 0.50% by weight of the weathering steel for truck frames.
8. The weathering steel for bogie frames according to claim 1, wherein in the weathering steel for bogie frames, Alt is 0.020-0.035% by weight.
9. The weathering steel for bogie frames according to claim 1, characterized in that it consists of the following elements in weight percent: 0.14-0.16% of C, 0.40-0.50% of Si, 0.40-0.55% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 0.45-0.50% of Cu, 0.90-1.20% of Cr, 0.80-1.20% of Ni, 0.08-0.12% of V, 0.40-0.50% of Mo, 0.020-0.035% of Alt, and the balance of Fe and inevitable impurities.
10. The weathering steel for bogie frames according to any of claims 1 to 9 characterized in that the structure of the weathering steel for bogie frames is characterized by fine ferrite and pearlite structure with a structure grain size of more than 9.0 grade.
11. The weathering steel for bogie frames according to any of claims 1 to 9 characterized in that the weathering steel for bogie frames has a tensile strength of not less than 700MPa, a yield strength of not less than 550MPa and an elongation after fracture of not less than 18%; according to TB/T2375, the cycle infiltration corrosion rate relative to Q345B is less than or equal to 50 percent.
12. The weathering steel for bogie frames according to any of claims 1 to 9 characterized in that it has a transverse impact performance K at-40 ℃V2≥180J。
13. The weathering steel for bogie frames according to any of claims 1 to 9 characterized in that the tensile and compressive fatigue limit of the bogie steel welded joint at room temperature is equal to or more than 350 MPa; the tensile and compression fatigue limit at-40 ℃ is more than or equal to 450MPa, the fatigue performance of the low-temperature welding joint is good, and the low-temperature brittleness is not generated.
14. The method for preparing weathering steel for truck frames according to any of claims 1 to 13, comprising the steps of:
(1) adding the pretreated molten iron and the scrap steel into a furnace, and carrying out converter smelting, ladle refining (LF) and vacuum circulating degassing Refining (RH);
(2) continuously casting steel to obtain a continuous casting slab;
(3) heating the continuous casting plate blank obtained in the step (2), fully austenitizing to fully dissolve micro-alloy elements, keeping the heating temperature at 1250-1280 ℃, keeping the temperature for 1.5-2 hours, and then rolling the continuous casting plate blank into a steel plate, wherein the rolling is carried out in two stages, namely a rough rolling stage and a finish rolling stage, the initial rolling temperature of the rough rolling stage is set to be more than 1100 ℃, the plasticity of the steel is good, the strength is low, the rolling is easy, the initial rolling temperature of the finish rolling stage is set to be 1100-980 ℃, and the final rolling temperature is set to be 850-800 ℃;
(4) normalizing the steel plate obtained in the step (3), wherein the normalizing heating temperature is 880-930 ℃, the normalizing heat preservation time is 30-60 min, and cooling in an air cooling mode after heat preservation is carried out to obtain the steel plate.
15. The method according to claim 14, wherein the step (1) is: adding the pretreated molten iron and the scrap steel into a furnace for smelting, and then carrying out ladle furnace refining and vacuum furnace degassing refining, wherein the procedures of ladle refining (LF) and vacuum cycle degassing Refining (RH) adopt clean steel smelting technology.
16. The production method according to claim 14, wherein, in the step (2),
the continuous casting steel adopts non-oxidation protection pouring in the whole process, and is matched with solidification tail end soft reduction and electromagnetic stirring, the addition of trace elements in the steel adopts tundish or crystallizer feeding, the yield of the trace elements can be ensured, when the crystallizer is fed, the yield of the trace elements is very high, but the trace elements have influence on the surface of a casting blank, and the inspection and the cleaning of the casting blank need to be paid attention to.
17. The preparation method according to claim 14, wherein in the step (2), the tapping temperature is 1560-1570 ℃.
18. The preparation method according to claim 14, wherein in the step (2), the casting temperature is 1540-1555 ℃.
19. The preparation method according to claim 14, wherein in the step (4), the steel plate obtained in the step (3) is normalized, the normalizing heating temperature is 890-910 ℃, the normalizing heat preservation time is 40-50 min, and the steel plate is cooled in an air cooling mode after heat preservation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110829797.6A CN113549834B (en) | 2021-07-22 | 2021-07-22 | Weather-resistant steel for bogie frame and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110829797.6A CN113549834B (en) | 2021-07-22 | 2021-07-22 | Weather-resistant steel for bogie frame and preparation method thereof |
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| CN109402508A (en) * | 2018-11-12 | 2019-03-01 | 东北大学 | A kind of low-carbon microalloyed Q690 grade high-strength weathering steel and preparation method thereof |
| CN110592478A (en) * | 2019-09-18 | 2019-12-20 | 南京钢铁股份有限公司 | Weather-resistant steel for railway bogie and manufacturing method thereof |
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| JPH0953152A (en) * | 1995-08-17 | 1997-02-25 | Nkk Corp | Steel for high strength bolt, excellent in atmospheric corrosion resistance and refractoriness |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109402508A (en) * | 2018-11-12 | 2019-03-01 | 东北大学 | A kind of low-carbon microalloyed Q690 grade high-strength weathering steel and preparation method thereof |
| CN110592478A (en) * | 2019-09-18 | 2019-12-20 | 南京钢铁股份有限公司 | Weather-resistant steel for railway bogie and manufacturing method thereof |
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