CN117327985A - B, ti microalloyed hot rolled bainite steel rail and manufacturing method thereof - Google Patents
B, ti microalloyed hot rolled bainite steel rail and manufacturing method thereof Download PDFInfo
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- CN117327985A CN117327985A CN202311383551.6A CN202311383551A CN117327985A CN 117327985 A CN117327985 A CN 117327985A CN 202311383551 A CN202311383551 A CN 202311383551A CN 117327985 A CN117327985 A CN 117327985A
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- steel rail
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 61
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 229910001563 bainite Inorganic materials 0.000 title claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 3
- 229910000734 martensite Inorganic materials 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000004512 die casting Methods 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims description 2
- 238000009849 vacuum degassing Methods 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 abstract description 10
- 239000000956 alloy Substances 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000009466 transformation 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
-
- 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
- C21D1/34—Methods of heating
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—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
- C22C38/28—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
-
- 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
- C21D2211/002—Bainite
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a B and T i microalloyed hot rolled bainite steel rail, which comprises the following chemical components in percentage by weight: c:0.20 to 0.30 percent; s i:0.90 to 1.40 percent; mn:1.70 to 2.10 percent; p is less than or equal to 0.010 percent; s is less than or equal to 0.005%; cr:0.70 to 1.00 percent; mo:0.20 to 0.30 percent; b: 10-20 ppm; t i:0.020 to 0.030 percent, and the balance of Fe and unavoidable impurities. Based on the composition range of the domestic traditional hot rolled bainitic steel rail, the invention replaces partial Mo and all N i alloy content by adding the microalloy of B and T i, thereby adjusting and optimizing the composition range of the bainitic steel rail, reducing the alloy manufacturing cost, optimizing the steel rail structure, and ensuring and improving the comprehensive performance.
Description
Technical Field
The invention relates to the field of steel rail production and application, in particular to a B, ti microalloyed hot rolled bainite steel rail and a manufacturing method thereof.
Background
The railway in China is developing at high speed and large transportation, the wear resistance, toughness, safety and other indexes of the steel rail are gradually improved, U75V and U71Mn are generally used as the railroad switch steel rail in a railway line, but along with the continuous development of passenger-cargo mixed transportation and freight heavy-load lines, higher requirements are provided for the service life of the railroad switch, the contact stress of the switch rail and the frog under the strong impact of wheels reaches or even exceeds 1400MPa, the stripping block appears on the contact surface frequently, the service life of the steel rail is greatly influenced, the bainite frog steel rail can maintain high toughness under the condition of ensuring high strength, the service life of the frog steel rail is greatly prolonged, the service life of the railroad switch rail is prolonged by more than 3 times compared with that of a pearlitic railroad switch steel rail, the toughness is improved, and the running safety of a train is greatly ensured.
The bainite steel rail component system developed in China has larger dosage of noble metals such as Ni, mo and the like in chemical components, and has larger optimization space from the viewpoint of reducing production cost. Through different heat treatment processes and adjustment of internal control components, the characteristics of ensuring the hardenability of steel, refining grains and microstructure and increasing the bainitic transformation interval by utilizing microalloy elements are utilized, the mechanical properties of the steel rail are ensured, the contact fatigue performance is improved, the service performance is improved, the alloy manufacturing cost is reduced, and the sales profit and market competitiveness of the bainitic steel rail are increased while the use requirement of a circuit is met.
Disclosure of Invention
The invention aims to provide a B, ti microalloyed hot rolled bainitic steel rail and a manufacturing method thereof, wherein B, ti microalloyed is added to replace part of Mo and all Ni alloy on the basis of the component range of the domestic traditional hot rolled bainitic steel rail, so that the component range of the bainitic steel rail is adjusted and optimized, the alloy manufacturing cost is reduced, the structure of the steel rail is optimized, and the comprehensive performance is ensured and improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a B, ti microalloyed hot rolled bainitic steel rail, which comprises the following chemical components in percentage by weight: c:0.20 to 0.30 percent; si:0.90 to 1.40 percent; mn:1.70 to 2.10 percent; p is less than or equal to 0.010 percent; s is less than or equal to 0.005%; cr:0.70 to 1.00 percent; mo:0.20 to 0.30 percent; b: 10-20 ppm; ti:0.020 to 0.030 percent, and the balance of Fe and unavoidable impurities.
Further, the bainite steel rail comprises the following chemical components in percentage by weight: c:0.25%; si:1.20%; mn:1.80%; cr:0.86%; mo:0.25%; b:0.0015%; ti:0.027% of Fe and the balance of unavoidable impurities.
A method for manufacturing B, ti microalloyed hot rolled bainitic steel rail, which is characterized by comprising the following steps of: adopts the production process of electric furnace smelting, vacuum degassing, die casting, ingot heating, rolling and tempering.
Further, the smelting vacuum degree of the steel rail electric furnace is controlled at 28-32 pa, the temperature of molten steel reaches 1550-1570 ℃, and after standing for 2-5 min, the steel rail electric furnace is taken out of the furnace for casting, and the diameter of a casting steel ingot is 200-300 mm.
Further, the heating temperature of the steel ingot is 1150-1200 ℃, the heating time is more than or equal to 180min, the heating speed is less than or equal to 400 ℃/h, the soaking temperature is 1160-1200 ℃, and the soaking time is more than or equal to 40min; the initial rolling temperature of the steel rail is 1060-1130 ℃, the final rolling temperature is 890-940 ℃, the rolling pass is more than or equal to 9, and the rolling compression ratio is more than or equal to 11:1, a step of; air cooling to room temperature after hot rolling, and tempering at 280-400 ℃.
Further, the manufactured steel rail microstructure comprises bainite, martensite and retained austenite, the yield strength of the steel rail is more than or equal to 1100MPa, the tensile strength is more than or equal to 1350MPa, the elongation is more than or equal to 12%, the tread hardness is more than or equal to 420HBW, and the room temperature impact energy is more than or equal to 70J.
Compared with the prior art, the invention has the beneficial technical effects that:
the manufactured steel rail microstructure comprises bainite, martensite and residual austenite, the yield strength of the steel rail is more than or equal to 1100MPa, the tensile strength is more than or equal to 1350MPa, the elongation is more than or equal to 12%, the tread hardness is more than or equal to 420HBW, and the room temperature impact energy is more than or equal to 70J. The produced hot rolled bainite steel rail has high strength, high hardness and good toughness, and meanwhile, the alloy manufacturing cost is low, so that the hot rolled bainite steel rail is suitable for popularization and application of heavy-duty railway lines.
Detailed Description
The present invention will be described in further detail with reference to specific examples, so that the present invention will be more clearly understood.
A B, ti microalloyed hot rolled bainitic steel rail and a manufacturing method thereof, and specific compositions of the examples are shown in table 1.
TABLE 1 comparative (mass fraction)/(% of different Components) during the examples
As shown in Table 1, example 1 is a more successful bainite steel rail component system developed in China, the precious Ni content in the chemical components is 0.60%, the Mo content is 0.45%, the alloy cost is high, and the bainite steel rail component has a larger optimization space from the viewpoint of reducing the production cost. In the embodiment 2, the design thought of adding no Ni element is adopted to improve the C, si content and reduce the Mn, cr and Mo contents, so that the production cost of the steel rail is reduced. In example 3, in order to increase C, si content and reduce Mn, cr and Mo contents, microalloying element B, ti is added, and the design thought of Ni element is not added, so that the manufacturing cost of the steel rail alloy is reduced.
Table 2 comparison of conventional mechanical properties during the examples
As is clear from Table 2, in example 2, the alloy element content was reduced and noble metal Ni element was not added, but the strength, hardness, toughness and impact energy of the rail were all reduced, and the toughness of the rail could not meet the mechanical properties of the existing rail, as compared with example 1.
Compared with example 1, the element in example 3C is increased by 0.05%, si is increased by 0.20%, mn is reduced by 0.40%, cr is reduced by 0.10%, mo is reduced by 0.20%, ni is reduced by 0.60%, B and Ti are increased by 0.0015% and 0.027%, the manufacturing cost of the steel rail alloy is obviously reduced, the tensile strength in example 3 is increased by 70MPa, the yield strength is increased by 30MPa, the tread hardness is increased by 15HBW, and meanwhile, the toughness of the steel rail is basically the same.
The hot rolled bainite steel rail produced by the invention has high strength, high hardness and good toughness, the mechanical properties are detected after the steel rail is tempered, the yield strength is more than or equal to 1100MPa, the tensile strength is more than or equal to 1350MPa, the elongation is more than or equal to 12%, the tread hardness is more than or equal to 420HBW, and the room temperature impact energy is more than or equal to 70J. The steel rail has better toughness than the existing steel rail, and the alloy has lower manufacturing cost, thereby being suitable for popularization and application of heavy-load railway lines.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. A B, ti microalloyed hot rolled bainitic steel rail, characterized by: the bainite steel rail comprises the following chemical components in percentage by weight: c:0.20 to 0.30 percent; si:0.90 to 1.40 percent; mn:1.70 to 2.10 percent; p is less than or equal to 0.010 percent; s is less than or equal to 0.005%; cr:0.70 to 1.00 percent; mo:0.20 to 0.30 percent; b: 10-20 ppm; ti:0.020 to 0.030 percent, and the balance of Fe and unavoidable impurities.
2. A B, ti microalloyed hot rolled bainitic steel rail according to claim 1, wherein: the bainite steel rail comprises the following chemical components in percentage by weight: c:0.25%; si:1.20%; mn:1.80%; cr:0.86%; mo:0.25%; b:0.0015%; ti:0.027% of Fe and the balance of unavoidable impurities.
3. A method of manufacturing B, ti microalloyed hot rolled bainitic steel rail according to claim 1 or 2, characterised in that: adopts the production process of electric furnace smelting, vacuum degassing, die casting, ingot heating, rolling and tempering.
4. A method of manufacturing according to claim 3, wherein: the smelting vacuum degree of the steel rail electric furnace is controlled at 28-32 pa, the temperature of molten steel reaches 1550-1570 ℃, and the steel rail electric furnace is taken out of the furnace for casting after standing for 2-5 min, and the diameter of a casting steel ingot is 200-300 mm.
5. The manufacturing method according to claim 4, characterized in that: the heating temperature of the steel ingot is 1150-1200 ℃, the heating time is more than or equal to 180min, the heating speed is less than or equal to 400 ℃/h, the soaking temperature is 1160-1200 ℃, and the soaking time is more than or equal to 40min; the initial rolling temperature of the steel rail is 1060-1130 ℃, the final rolling temperature is 890-940 ℃, the rolling pass is more than or equal to 9, and the rolling compression ratio is more than or equal to 11:1, a step of; air cooling to room temperature after hot rolling, and tempering at 280-400 ℃.
6. The manufacturing method according to claim 5, characterized in that: the manufactured steel rail microstructure comprises bainite, martensite and residual austenite, the yield strength of the steel rail is more than or equal to 1100MPa, the tensile strength is more than or equal to 1350MPa, the elongation is more than or equal to 12%, the tread hardness is more than or equal to 420HBW, and the room temperature impact energy is more than or equal to 70J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311383551.6A CN117327985B (en) | 2023-10-24 | B, ti microalloyed hot rolled bainite rail and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311383551.6A CN117327985B (en) | 2023-10-24 | B, ti microalloyed hot rolled bainite rail and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117327985A true CN117327985A (en) | 2024-01-02 |
| CN117327985B CN117327985B (en) | 2024-10-29 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105970110A (en) * | 2016-05-04 | 2016-09-28 | 武汉钢铁股份有限公司 | Low-alloy high-strength abrasion-resistant steel and preparation method thereof |
| CN107779758A (en) * | 2016-08-26 | 2018-03-09 | 鞍钢股份有限公司 | Novel low-cost and high-cost-performance bainite steel rail and production method thereof |
| CN107779759A (en) * | 2016-08-26 | 2018-03-09 | 鞍钢股份有限公司 | Boron-containing bainite steel rail with excellent delayed fracture resistance and production method thereof |
| CN110468347A (en) * | 2019-09-02 | 2019-11-19 | 鞍钢股份有限公司 | A kind of high-strength tenacity bainite rail and its manufacturing method |
| CN113416818A (en) * | 2021-05-12 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Heat treatment process of high-strength and high-toughness bainite/martensite multiphase bainite steel rail |
| CN116555684A (en) * | 2023-04-18 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Vanadium microalloyed high-strength bainite steel rail and manufacturing method thereof |
| CN116555669A (en) * | 2023-05-16 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Niobium microalloyed high-strength bainite steel rail and production method thereof |
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105970110A (en) * | 2016-05-04 | 2016-09-28 | 武汉钢铁股份有限公司 | Low-alloy high-strength abrasion-resistant steel and preparation method thereof |
| CN107779758A (en) * | 2016-08-26 | 2018-03-09 | 鞍钢股份有限公司 | Novel low-cost and high-cost-performance bainite steel rail and production method thereof |
| CN107779759A (en) * | 2016-08-26 | 2018-03-09 | 鞍钢股份有限公司 | Boron-containing bainite steel rail with excellent delayed fracture resistance and production method thereof |
| CN110468347A (en) * | 2019-09-02 | 2019-11-19 | 鞍钢股份有限公司 | A kind of high-strength tenacity bainite rail and its manufacturing method |
| CN113416818A (en) * | 2021-05-12 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Heat treatment process of high-strength and high-toughness bainite/martensite multiphase bainite steel rail |
| CN116555684A (en) * | 2023-04-18 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Vanadium microalloyed high-strength bainite steel rail and manufacturing method thereof |
| CN116555669A (en) * | 2023-05-16 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Niobium microalloyed high-strength bainite steel rail and production method thereof |
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