CN107312976B - Bainite steel rail and production method thereof - Google Patents
Bainite steel rail and production method thereof Download PDFInfo
- Publication number
- CN107312976B CN107312976B CN201710464162.4A CN201710464162A CN107312976B CN 107312976 B CN107312976 B CN 107312976B CN 201710464162 A CN201710464162 A CN 201710464162A CN 107312976 B CN107312976 B CN 107312976B
- Authority
- CN
- China
- Prior art keywords
- temperature
- steel rail
- rolling
- less
- bainite steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B5/00—Rails; Guard rails; Distance-keeping means for them
- E01B5/02—Rails
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a bainite steel rail and a production method thereof, wherein the bainite steel rail comprises the following raw materials in percentage by mass: c: 0.20 to 0.35%, Si: 0.8-1.2%, Mn: 1.8-2.2%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, B: 0.001-0.003%, V: 0.06-0.08%, Ti: 0.02-0.05%, Cr: 0.1-0.3%, Cu is less than or equal to 0.02%, Mo is less than 0.005%, Als: 0.015-0.035%, Ca: 0.001 to 0.007% of Fe and the balance of inevitable impurity elements. The bainite steel rail with uniform structure and no segregation is produced by a series of process flows of molten iron desulphurization, converter smelting, argon station, LF external refining, RH vacuum degassing, continuous casting, billet heating and rolling and post-rolling heat treatment of the components, and the bainite steel rail has the advantages that: the bainite steel rail produced by the method has no decarburized structure on the surface, low content of residual austenite, no martensite influencing the performance, less precious metal addition and greatly reduced production cost.
Description
Technical Field
The invention belongs to the technical field of steel rail production, and particularly relates to a production method of a bainite steel rail.
Background
With the development of high-speed heavy load of railway trains, the service conditions of the steel rails become more and more severe. Studies have shown that the primary failure modes of rails are wear and contact fatigue. The rolling contact fatigue damage (RCF) of the steel rail is a common problem in the world railway transportation, not only is the safety of the railway transportation concerned, but also the service life of the steel rail is shortened, and the maintenance cost of the line is increased. In view of the defect that the traditional pearlite rail steel cannot simultaneously consider the wear resistance and the contact fatigue resistance, a large amount of researches are carried out by railway transportation departments of various countries, mainly comprising the research on damage mechanisms, the research on novel contact fatigue resistant rail materials and the research on rail grinding technologies. In the research of novel steel rail materials, the bainite steel is known as the steel rail steel of the 21 st century by matching with the excellent obdurability. Through reasonable alloying and structure regulation, the wear resistance and the contact fatigue resistance of the bainite rail steel are superior to those of the prior pearlite rail steel. In recent years, the damage of the steel rail is obviously increased after the speed of the railway in China is increased, and the damage is presented in a new rolling contact fatigue damage form such as inclined crack, hidden damage and the like of a tread. Therefore, it is necessary to develop a new rail material while developing a rail grinding technique.
Patent CN201110040453.3 discloses a method for manufacturing a non-quenched and tempered 1000 MPa-grade low-carbon bainite high-strength steel plate, which comprises the following process flows: KR molten iron pretreatment; smelting in a converter; adjusting CAS (CAS) treatment by sealing and blowing argon alloy components; refining LF in a ladle furnace; vacuum degassing RH/VD; continuously casting the plate blank; cutting and finishing the plate blank; cold loading of the plate blank; reheating the plate blank; rolling under the control of double racks; pre-straightening; controlling cooling; straightening; self-tempering in the heat preservation cover; and air cooling to obtain the finished steel plate. The defects are that the strength is too low to meet the use requirement of the steel rail, the process is complex, and the cost is high due to the addition of the precious metal Mo + Ni.
Patent CN201110074144.8 discloses a steel for low-carbon bainite engineering machinery, which comprises the following chemical components in percentage by weight: c: 0.05 to 0.10%, Si: 0.20 to 0.50%, Mn: 1.50-1.80%, S is less than or equal to 0.010%, P is less than or equal to 0.018%, Nb is less than or equal to 0.10%, Mo is less than or equal to 0.10%, Ti: 0.010-0.040%, B: 0.0010-0.0030%, Cr: 0.20 to 0.50%, Al: 0.015-0.050%, and the balance of Fe and trace impurities. The bainite engineering mechanical steel with high strength and good low-temperature toughness is produced by utilizing the existing equipment through molten iron pretreatment, combined blown converter smelting, LF refining, RH refining, plate blank continuous casting, adjusting part of element content, microalloying treatment, TMCP process production, controlled rolling and water cooling without heat treatment. The disadvantage is that the strength is too low to meet the use requirement of the steel rail.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a production technology which has simple process and lower energy consumption and is suitable for the level of the existing industrial equipment.
In order to achieve the above object, the present invention provides a novel bainite rail and a method for producing the same, comprising:
a bainite steel rail comprises the following raw material chemical components in percentage by mass: c: 0.20 to 0.35%, Si: 0.8-1.2%, Mn: 1.8-2.2%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, B: 0.001-0.003%, V: 0.06-0.08%, Ti: 0.02-0.05%, Cr: 0.1-0.3%, Cu is less than or equal to 0.02%, Mo is less than 0.005%, Als: 0.015-0.035%, Ca: 0.001-0.007% of Fe and inevitable impurities as the rest.
A production method of a bainite steel rail comprises the following raw material chemical components by mass percent: c: 0.20 to 0.35%, Si: 0.8-1.2%, Mn: 1.8-2.2%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, B: 0.001-0.003%, V: 0.06-0.08%, Ti: 0.02-0.05%, Cr: 0.1-0.3%, Cu is less than or equal to 0.02%, Mo is less than 0.005%, Als: 0.015-0.035%, Ca: 0.001-0.007% of Fe and inevitable impurities as the rest; in the continuous casting step of the production method, the tundish temperature is controlled to be 15-25 ℃ above the liquidus temperature, the casting speed is controlled to be 0.3-0.5 m/min, and a liquid core reduction process is adopted to form a casting blank.
In the step of heating and rolling the steel billet, the temperature of a casting blank heating zone II is 1050-1150 ℃, the temperature of a casting blank heating zone I is 1200-1300 ℃, the temperature of a soaking section is 1250-1300 ℃, the total heating time is 220-240 min, the initial rolling temperature is 1080-1180 ℃, and the final rolling temperature is 850-940 ℃.
Specifically, the production method of the bainite steel rail further comprises a post-rolling heat treatment step, wherein in the post-rolling heat treatment step, rolled pieces 67s pass through a track, the wind pressure is 12-16 MPa, the rolled pieces are freely air-cooled after going up a cooling bed, the rolled pieces are kept warm for 1-1.5 hours in a heating furnace at 200-300 ℃ after going down the cooling bed, and the rolled pieces are air-cooled to the room temperature.
Specifically, the liquid core pressing technology is matched with an electromagnetic stirring technology for continuous casting, the current intensity is 400-600A, the frequency is 5Hz, and the terminal liquid core is slightly pressed by 8-10 mm.
According to the invention, Si is used for preventing carbide from being precipitated in the bainite phase transformation process, Mn delays the high-temperature transformation of super-cooled austenite, and trace boron is used for improving the hardenability of steel, promoting the separation of pearlite and bainite transformation curves and developing the Mn-B bainite steel rail. The beneficial effects are as follows: 1) the bainite steel rail produced by the method has uniform structure, no segregation, no decarburization structure on the surface, low content of residual austenite, no martensite influencing the performance, and 2) low content of precious metal, thereby greatly reducing the production cost.
Drawings
FIG. 1 is a bainite microstructure diagram of a steel rail produced by the method
Detailed Description
The invention is further illustrated by the following examples, without restricting the invention thereto. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
Example 1:
1. a bainite steel rail comprises the following raw material chemical components in percentage by mass: c: 0.26%, Si: 0.8%, Mn: 1.93%, P: 0.013%, S: 0.008%, B: 0.0028%, V: 0.071%, Ti: 0.03%, Cr: 0.2%, Cu: 0.007%, Mo: 0.0007%, Als: 0.0286%, Ca: 0.004%, and the balance of Fe and impurity elements.
2. Production method of bainite steel rail
Controlling the temperature of the upper continuous casting platform, controlling the temperature of the tundish to be 23 ℃ above a liquidus line during continuous casting, controlling the drawing speed to be 0.3m/min, and continuously casting into a 280 x 380mm square billet by adopting liquid core pressing and matching with an electromagnetic stirring technology, wherein the current intensity is 400A, and the frequency is 5 Hz; the liquid core at the tail end is slightly pressed for 10 mm.
Heating technological parameters in the steps of heating and rolling the steel billet are as follows: temperature of casting blank heating zone II is 1086 ℃, temperature of casting blank heating zone I is 1247 ℃, temperature of soaking section: 1281 ℃, heating time 223min, no overheating or overburning, and BD1 rolling temperature: 1097 ℃ and 863 ℃ of the finish rolling temperature of universal rolling.
In the step of post-rolling heat treatment, rolled pieces pass through a 100-meter long fan pipeline at the speed of 1.5m/s, the wind pressure force of a fan is 12MPa, and the rolled pieces are freely cooled in air after being loaded on a cooling bed. And (5) placing the mixture in a cooling bed, then preserving the heat in a heating furnace at 300 ℃ for 1h, and cooling the mixture in air to room temperature.
Example 2:
1. a bainite steel rail comprises the following raw material chemical components in percentage by mass: c: 0.27%, Si: 1.17%, Mn: 1.82%, P: 0.018%, S: 0.011%, B: 0.0023%, V: 0.067%, Ti: 0.031%, Cr: 0.22%, Cu: 0.005%, Mo: 0.0005%, Als: 0.0223%, Ca: 0.006 percent, and the balance of Fe and impurity elements.
2. Production method of bainite steel rail
Controlling the temperature of the upper continuous casting platform, controlling the temperature of the tundish to be 21 ℃ above a liquidus line during continuous casting, controlling the drawing speed to be 0.5m/min, and continuously casting into a 280 x 380mm square billet by adopting liquid core pressing and matching with an electromagnetic stirring technology, wherein the current intensity is 600A, and the frequency is 5 Hz; the tail end liquid core is lightly pressed for 8 mm.
Heating technological parameters in the steps of heating and rolling the steel billet are as follows: the temperature of the casting blank heating zone II is 1105 ℃, the temperature of the casting blank heating zone I is 1278 ℃, and the temperature of the soaking section is as follows: 1291 ℃, heating time of 233min, no overheating or overburning, start rolling temperature of BD 1: 1174 ℃ and the finish rolling temperature of universal rolling is 917 ℃.
In the step of post-rolling heat treatment, rolled pieces pass through a 100-meter long fan pipeline at the speed of 1.5m/s, the wind pressure force of a fan is 14MPa, and the rolled pieces are freely cooled in air after being loaded on a cooling bed. And (5) placing the mixture in a cooling bed, then preserving the heat in a heating furnace at 200 ℃ for 1.5h, and cooling the mixture in air to room temperature.
Example 3:
1. a bainite steel rail comprises the following raw material chemical components in percentage by mass: c: 0.33%, Si: 1.1%, Mn: 2.08%, P: 0.015%, S: 0.012%, B: 0.0025%, V: 0.063%, Ti: 0.029%, Cr: 0.17%, Cu: 0.002%, Mo: 0.0002%, Als: 0.0272%, Ca: 0.007% of the total weight of the alloy, and the balance of Fe and impurity elements.
2. Production method of bainite steel rail
Controlling the temperature of the upper continuous casting platform, controlling the temperature of the tundish to be 18 ℃ above a liquidus line during continuous casting, controlling the drawing speed to be 0.5m/min, and continuously casting into a 280 x 380mm square billet by adopting liquid core pressing and matching with an electromagnetic stirring technology, wherein the current intensity is 600A, and the frequency is 5 Hz; the liquid core at the tail end is slightly pressed for 10 mm.
Heating technological parameters in the steps of heating and rolling the steel billet are as follows: temperature of casting blank heating zone II is 1089 ℃, temperature of casting blank heating zone I is 1289 ℃, temperature of soaking section: 1293 ℃, heating time is 238min, overheating and overburning are avoided, and the start rolling temperature of BD1 is as follows: 1171 ℃ and the universal rolling finishing temperature is 938 ℃.
In the step of post-rolling heat treatment, rolled pieces pass through a 100-meter long fan pipeline at the speed of 1.5m/s, the wind pressure force of a fan is 16MPa, and the rolled pieces are freely cooled in air after being loaded on a cooling bed. And (5) placing the material on a cooling bed, then preserving the heat in a heating furnace at 270 ℃ for 1.2h, and cooling the material to room temperature in air.
Example 4:
1. a bainite steel rail comprises the following raw material chemical components in percentage by mass: c: 0.20%, Si: 1.2%, Mn: 1.80%, P: 0.035%, S: 0.012%, B: 0.001%, V: 0.06%, Ti: 0.05%, Cr: 0.1%, Cu: 0.015%, Mo: 0.005%, Als: 0.015%, Ca: 0.003% and the balance of Fe and impurity elements.
2. Production method of bainite steel rail
Controlling the temperature of the upper continuous casting platform, controlling the temperature of the tundish to be 15 ℃ above a liquidus line during continuous casting, controlling the drawing speed to be 0.5m/min, and continuously casting into a 280 x 380mm square billet by adopting liquid core pressing and matching with an electromagnetic stirring technology, wherein the current intensity is 500A, and the frequency is 5 Hz; the liquid core at the tail end is slightly pressed for 10 mm.
Heating technological parameters in the steps of heating and rolling the steel billet are as follows: the temperature of the casting blank heating zone II is 1050 ℃, the temperature of the casting blank heating zone I is 1200 ℃, and the temperature of the soaking section is as follows: 1250 ℃, the heating time is 240min, overheating and overburning are avoided, and the start rolling temperature of BD1 is as follows: 1080 ℃ and 940 ℃ for universal rolling finishing temperature.
In the step of post-rolling heat treatment, rolled pieces pass through a 100-meter long fan pipeline at the speed of 1.5m/s, the wind pressure force of a fan is 13MPa, and the rolled pieces are freely cooled in air after being loaded on a cooling bed. And (5) placing the material on a cooling bed, then preserving the heat in a heating furnace at 270 ℃ for 1.5h, and cooling the material to room temperature in air.
Example 5:
1. a bainite steel rail comprises the following raw material chemical components in percentage by mass: c: 0.35%, Si: 1.1%, Mn: 2.20%, P: 0.015%, S: 0.035%, B: 0.003%, V: 0.08%, Ti: 0.02%, Cr: 0.3%, Cu: 0.02%, Mo: 0.001%, Als: 0.035%, Ca: 0.001%, and the balance of Fe and impurity elements.
2. Production method of bainite steel rail
Controlling the temperature of the upper continuous casting platform, controlling the temperature of the tundish to be 25 ℃ above a liquidus line during continuous casting, controlling the drawing speed to be 0.4m/min, and continuously casting into a 280 x 380mm square billet by adopting liquid core pressing and matching with an electromagnetic stirring technology, wherein the current intensity is 600A, and the frequency is 5 Hz; the liquid core at the tail end is lightly pressed for 9 mm.
Heating technological parameters in the steps of heating and rolling the steel billet are as follows: the temperature of the casting blank heating zone II is 1150 ℃, the temperature of the casting blank heating zone I is 1300 ℃, and the temperature of the soaking section is as follows: 1300 ℃, heating time of 220min, no overheating and no overburning, start rolling temperature of BD 1: 1180 ℃ and the finishing temperature of universal rolling is 850 ℃.
In the step of post-rolling heat treatment, the rolled piece passes through a 100-meter long fan pipeline at the speed of 1.5m/s, the wind pressure force of the fan is 15MPa, and the rolled piece is freely cooled in air after being loaded on a cooling bed. And (5) placing the material on a cooling bed, then preserving the heat in a heating furnace at 250 ℃ for 1.2h, and cooling the material to room temperature in air.
Comparing the bainite steel rail produced in the embodiment 1-5 with two bainite steel rail products produced in a certain domestic factory, the raw material chemical components of the comparative steel 1 are as follows by mass percent: c: 0.21%, Si: 1.41%, Mn: 2.10%, P: 0.009%, S: 0.01%, Cr: 0.57%, Mo: 0.35%, V: 0.005 percent; the comparative steel 2 comprises the following raw materials in percentage by mass: c: 0.23%, Si: 1.01%, Mn: 2.20%, P: 0.008%, S: 0.009%, Cr: 0.55%, Mo: 0.37%, V: 0.003%. The five steels of different compositions were subjected to performance tests, the results of which are shown in table 1.
TABLE 1 comparison of the Properties of the rails produced in the examples and comparative examples
The microstructure of fig. 1 shows a clear bainite structure.
As can be seen from the table, the strength of the bainitic steel rail produced by the invention is about 100MPa higher than that of the comparative steel grade, and the fracture toughness K is higher at elongation and 20 ℃ below zeroICThe steel grade is superior to the steel grade of the comparative example in aspects, and the content of the participating austenite is lower than that of the steel grade of the comparative example.
Claims (2)
1. A production method of a bainite steel rail comprises the following raw material chemical components by mass percent: c: 0.20 to 0.35%, Si: 0.8-12%, Mn: 1.8-2.2%, P is less than or equal to 0.035%, S is less than or equal to 0.035%, B: 0.001-0.003%, V: 0.06-0.08%, Ti: 0.02-0.05%, Cr: 0.1-0.3%, Cu is less than or equal to 0.02%, Mo is less than 0.005%, Als: 0.015-0.035%, Ca: 0.001-0.007% of Fe and inevitable impurities as the rest; in the continuous casting step of the production method, the tundish temperature is controlled to be 15-25 ℃ above the liquidus temperature, the casting speed is controlled to be 0.3-0.5 m/min, and a liquid core reduction process is adopted to form a casting blank; the production method further comprises the steps of heating and rolling the steel billet, wherein in the step of heating and rolling the steel billet, the temperature of a casting blank heating area II is 1050-1150 ℃, the temperature of a casting blank heating area I is 1200-1300 ℃, the temperature of a soaking section is 1250-1300 ℃, the total heating time is 220-240 min, the start rolling temperature is 1080-1180 ℃, and the finish rolling temperature is 850-940 ℃; the production method further comprises a post-rolling heat treatment step, wherein in the post-rolling heat treatment step, rolled pieces 67s pass through a track, the wind pressure is 12-16 MPa, the rolled pieces are freely cooled in air after going up a cooling bed, the rolled pieces are kept warm for 1-1.5 h in a heating furnace at 200-300 ℃ after going down the cooling bed, and the rolled pieces are cooled in air to the room temperature.
2. The method for producing a bainite steel rail according to claim 1, wherein: the liquid core pressing technology is matched with an electromagnetic stirring technology for continuous casting, the current intensity is 400-600A, the frequency is 5Hz, and the terminal liquid core is slightly pressed for 8-10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710464162.4A CN107312976B (en) | 2017-06-19 | 2017-06-19 | Bainite steel rail and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710464162.4A CN107312976B (en) | 2017-06-19 | 2017-06-19 | Bainite steel rail and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107312976A CN107312976A (en) | 2017-11-03 |
| CN107312976B true CN107312976B (en) | 2020-04-07 |
Family
ID=60183755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710464162.4A Active CN107312976B (en) | 2017-06-19 | 2017-06-19 | Bainite steel rail and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107312976B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116555684B (en) * | 2023-04-18 | 2024-06-11 | 包头钢铁（集团）有限责任公司 | Vanadium microalloyed high-strength bainite steel rail and manufacturing method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11152520A (en) * | 1997-11-20 | 1999-06-08 | Nippon Steel Corp | Production of high strength bainite rail excellent in surface damage resistance and wear resistance |
| CN1255949A (en) * | 1998-01-14 | 2000-06-07 | 新日本制铁株式会社 | Bainite type rail excellent in surface fatigue damage resistance and wear resistance |
| JP2000199041A (en) * | 1999-01-07 | 2000-07-18 | Nippon Steel Corp | Bainitic rail excellent in rolling fatigue damaging resistance and inside fatigue damaging resistance |
| JP2002194498A (en) * | 2000-12-22 | 2002-07-10 | Nippon Steel Corp | Bainitic rail having excellent surface damage resistance and wear resistance and its production method |
| CN1477226A (en) * | 2003-08-01 | 2004-02-25 | 清华大学 | Medium-low carbon manganese system self-hardening bainite steel |
| CN102021481A (en) * | 2009-09-15 | 2011-04-20 | 鞍钢股份有限公司 | Micro-alloyed bainite steel rail and heat treatment method thereof |
| CN105107848A (en) * | 2015-07-23 | 2015-12-02 | 武汉钢铁(集团)公司 | Method for producing high-strength bridge cable steel wire rod |
| CN106399654A (en) * | 2016-09-09 | 2017-02-15 | 武汉钢铁股份有限公司 | Method for relieving pattern segregation of spring steel |
-
2017
- 2017-06-19 CN CN201710464162.4A patent/CN107312976B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11152520A (en) * | 1997-11-20 | 1999-06-08 | Nippon Steel Corp | Production of high strength bainite rail excellent in surface damage resistance and wear resistance |
| CN1255949A (en) * | 1998-01-14 | 2000-06-07 | 新日本制铁株式会社 | Bainite type rail excellent in surface fatigue damage resistance and wear resistance |
| JP2000199041A (en) * | 1999-01-07 | 2000-07-18 | Nippon Steel Corp | Bainitic rail excellent in rolling fatigue damaging resistance and inside fatigue damaging resistance |
| JP2002194498A (en) * | 2000-12-22 | 2002-07-10 | Nippon Steel Corp | Bainitic rail having excellent surface damage resistance and wear resistance and its production method |
| CN1477226A (en) * | 2003-08-01 | 2004-02-25 | 清华大学 | Medium-low carbon manganese system self-hardening bainite steel |
| CN102021481A (en) * | 2009-09-15 | 2011-04-20 | 鞍钢股份有限公司 | Micro-alloyed bainite steel rail and heat treatment method thereof |
| CN105107848A (en) * | 2015-07-23 | 2015-12-02 | 武汉钢铁(集团)公司 | Method for producing high-strength bridge cable steel wire rod |
| CN106399654A (en) * | 2016-09-09 | 2017-02-15 | 武汉钢铁股份有限公司 | Method for relieving pattern segregation of spring steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107312976A (en) | 2017-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112981235B (en) | Hardened and tempered steel plate with yield strength of 420MPa grade for building structure and production method thereof | |
| CN111441000A (en) | 690 MPa-yield-strength low-yield-ratio high-strength steel plate and manufacturing method thereof | |
| CN112981239B (en) | Quenched and tempered low-carbon alloy steel and manufacturing method thereof | |
| US20160230247A1 (en) | Non quenched and tempered steel and manufacturing process thereof | |
| CN110423946A (en) | A kind of production method of low compression ratio super-high strength steel Q960E special heavy plate | |
| CN110951944A (en) | High-strength and high-hardness rare earth steel rail material subjected to online heat treatment and production method thereof | |
| CN107385353A (en) | A kind of ocean platform special thick EH36 steel plates of 250mm and preparation method thereof | |
| JP2016539243A (en) | Non-tempered steel and manufacturing method thereof | |
| CN115505713B (en) | Heat treatment process for reducing residual stress of hundred-meter online heat-treated bainitic steel rail | |
| CN110904385A (en) | Low-cost cold-rolled steel plate for chain and production method thereof | |
| CN107460404A (en) | A kind of yield strength 800MPa ultra-high strength strip steels and preparation method thereof | |
| CN114150218A (en) | Q355NE hot-rolled round steel for high-speed rail bogie and production process | |
| CN114134388A (en) | Thin-specification ultrahigh-strength steel plate with 1300 MPa-level tensile strength and manufacturing method thereof | |
| CN107587075B (en) | Inexpensive plastic die steel and its production method | |
| CN113877964A (en) | Method for improving toughness of steel rail | |
| CN110284061B (en) | High-temperature deformation resistant 75Cr1 saw blade steel and production process thereof | |
| CN107312976B (en) | Bainite steel rail and production method thereof | |
| CN114875331B (en) | 610 MPa-grade thick steel plate with excellent core fatigue performance and production method thereof | |
| CN110512151A (en) | A kind of rare earth NM450 Wide and Heavy Plates and its production method | |
| CN114134387B (en) | 1300 MPa-tensile-strength thick-specification ultrahigh-strength steel plate and manufacturing method thereof | |
| CN114000068B (en) | Low-nitrogen ultrahigh-strength hot-rolled steel strip with thickness of 4-10mm and production method thereof | |
| CN113444969B (en) | Steel plate for low-temperature service condition of American standard container and production method thereof | |
| CN103555912B (en) | A kind of 30Cr3MoV steel that utilizes is for the method for raw material production plug | |
| CN112301200A (en) | Steel rail with delayed fracture resistance and preparation method thereof | |
| CN109694994B (en) | Corrosion-resistant high-wear-resistant steel ball and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |