CN117051329A - U71MnCr steel rail with good welding quality and smelting method thereof - Google Patents
U71MnCr steel rail with good welding quality and smelting method thereof Download PDFInfo
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- CN117051329A CN117051329A CN202310910554.4A CN202310910554A CN117051329A CN 117051329 A CN117051329 A CN 117051329A CN 202310910554 A CN202310910554 A CN 202310910554A CN 117051329 A CN117051329 A CN 117051329A
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000003723 Smelting Methods 0.000 title claims abstract description 20
- 238000003466 welding Methods 0.000 title claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 24
- 238000007670 refining Methods 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000012797 qualification Methods 0.000 claims abstract description 7
- 238000011065 in-situ storage Methods 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- 229910052742 iron Inorganic materials 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 16
- 238000009849 vacuum degassing Methods 0.000 claims description 16
- 238000007664 blowing Methods 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 230000004048 modification Effects 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 229910052788 barium Inorganic materials 0.000 claims description 4
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 4
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 4
- 239000000378 calcium silicate Substances 0.000 claims description 4
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000010436 fluorite Substances 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 238000004886 process control Methods 0.000 claims 1
- 229910000997 High-speed steel Inorganic materials 0.000 abstract description 8
- 238000005096 rolling process Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a U71MnCr steel rail with good welding quality and a smelting method thereof, wherein the smelting method provided by the invention optimally controls smelting process parameters including refining in-situ temperature, continuous casting process drawing speed and the like, and optimally controls the chemical components of the high-speed steel rail and the percentage content thereof to be C0.69-0.73%; si 0.35-0.50%; mn0.70-0.74%; p is less than or equal to 0.018 percent; s is less than or equal to 0.006%; cr0.10-0.14%; v0.01-0.03%, and the balance Fe and unavoidable impurities, and can obtain the U71MnCr steel rail with good welding quality, wherein the drop hammer qualification rate is obviously improved, and the average gray spot area of a fracture is obviously reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgical materials, and particularly relates to a U71MnCr steel rail with good welding quality and a smelting method thereof.
Background
At present, the high-speed railway rails in China mainly comprise U71Mn and U75V, wherein the U71Mn has the advantages of high toughness, fatigue resistance and the like, and is widely applied to the high-speed railway in China, however, with the increase of the consumption, the welding quality of the U71Mn rails is found to be poor, for example, the drop hammer qualification rate average value only reaches about 86 percent, the fracture gray spot area is larger (the statistical area average is 12.2 mm) 2 ) This can significantly reduce the performance of the high speed rail.
Disclosure of Invention
Aiming at the problems, the invention provides a U71MnCr steel rail with good welding quality, wherein the U71MnCr steel rail comprises the following chemical components in percentage by mass: c0.69-0.73%; si 0.35-0.50%; mn0.70-0.74%; p is less than or equal to 0.018 percent; s is less than or equal to 0.006%; cr0.10-0.14%; v0.01-0.03%, and Fe and unavoidable impurities in balance;
the average drop hammer qualification rate of the welding joint of the U71MnCr steel rail reaches more than 96 percent, and the fracture gray spot area is 3.8mm 2 The following are set forth;
the smelting method of the U71MnCr steel rail comprises the following steps: molten iron pretreatment, converter smelting, LF refining, VD vacuum degassing and continuous casting; wherein:
in the LF refining process, desulfurization is carried out according to the components and the temperature of the molten steel of the converter, and the components are finely adjusted and the temperature is increased, so that the refining in-situ temperature is 1560-1600 ℃;
in the continuous casting process, protection casting is adopted, low-aluminum casting powder is adopted, weak cold water distribution is adopted in the second cooling section, the whole-process constant pulling speed operation is adopted, the pulling speed is 4.4-5.0m/min, the electric stirring and the light pressing of the casting machine are started, and the quality of the continuous casting blank is ensured;
wherein the chemical components of the continuous casting blank comprise the following components in percentage by mass: c0.69-0.73%; si 0.35-0.50%; mn0.70-0.74%; p is less than or equal to 0.018 percent; s is less than or equal to 0.006%; cr0.10-0.14%; v0.01-0.03%, and Fe and unavoidable impurities in balance.
In some embodiments, in the molten iron pretreatment process, the sulfur content in the molten iron is controlled to be less than or equal to 0.010 percent, and the phosphorus content is controlled to be less than or equal to 0.10 percent.
In some embodiments, in the converter smelting process, the content of tapping C is controlled to be more than or equal to 0.08%, the tapping temperature is controlled to be more than or equal to 1560 ℃, lime, calcium silicate barium and fluorite are added after tapping, deoxidization and slag modification are carried out, the argon blowing effect is ensured in the tapping process, and the slag is free from caking phenomenon when molten steel is refined in place.
In some embodiments, in the VD vacuum degassing process, the deep vacuum degassing time is not less than 15min, soft blowing is not less than 18min after vacuum degassing, the soft blowing is performed at Cheng Yaqi flow, and the molten steel is not exposed due to peristaltic motion.
The smelting method of the U71MnCr steel rail provided by the technical scheme comprises the steps of optimally controlling smelting process parameters including refining in-situ temperature (1560-1600 ℃) and continuous casting process drawing speed (4.4-5.0 m/min) and the like, and optimally controlling the chemical components of the high-speed steel rail and the percentage content thereof to be C0.69-0.73%; si 0.35-0.50%; mn0.70-0.74%; p is less than or equal to 0.018 percent; s is less than or equal to 0.006%; cr0.10-0.14%; v0.01-0.03%, and Fe and unavoidable impurities in balance, can obtain a U71MnCr steel rail with good welding quality, the drop weight qualification rate of the steel rail is more than 96%, and the average gray spot area of a fracture is 3.8mm 2 In the following, the performance of the high-speed steel rail is obviously improved.
Detailed Description
The invention aims to provide a U71MnCr steel rail with good welding quality.
The U71MnCr steel rail with good welding quality is realized by a smelting method comprising the following processes: molten iron pretreatment, converter smelting, LF refining, VD vacuum degassing and continuous casting; wherein:
in the molten iron pretreatment process, the sulfur content in molten iron is controlled to be less than or equal to 0.010 percent, and the phosphorus content is controlled to be less than or equal to 0.10 percent;
in the converter smelting process, the content of tapping C is controlled to be more than or equal to 0.08%, the tapping temperature is controlled to be more than or equal to 1560 ℃, lime, calcium silicate barium and fluorite are added after tapping, deoxidation and slag modification are carried out, the argon blowing effect is ensured in the tapping process, and the slag is not blocked when molten steel is refined in place;
in the LF refining process, desulfurization is carried out according to the components and the temperature of the molten steel of the converter, and the components are finely adjusted and the temperature is increased, so that the refining in-situ temperature is 1560-1600 ℃;
in the VD vacuum degassing process, the deep vacuum degassing time is not less than 15min, soft blowing is not less than 18min after vacuum degassing, the flow rate of soft blowing Cheng Yaqi is stable, and the molten steel is not exposed due to creeping;
in the continuous casting process, protection casting is adopted, low-aluminum casting powder is adopted, weak cold water distribution is adopted in the second cooling section, the whole-process constant pulling speed operation is adopted, the pulling speed is 4.4-5.0m/min, the electric stirring and the light pressing of the casting machine are started, and the quality of the continuous casting blank is ensured;
wherein the chemical components of the continuous casting blank comprise the following components in percentage by mass: c0.69-0.73%; si 0.35-0.50%; mn0.70-0.74%; p is less than or equal to 0.018 percent; s is less than or equal to 0.006%; cr0.10-0.14%; v0.01-0.03%, and Fe and unavoidable impurities in balance.
The continuous casting billet obtained based on the smelting method is rolled by a rail beam factory universal rolling mill (continuous casting billet heating, universal rolling mill rolling, cooling by a cooling bed, pre-bending and straightening), and the U71MnCr steel rail with good welding quality can be obtained, and comprises the following chemical components in percentage by mass: c0.69-0.73%; si 0.35-0.50%; mn0.70-0.74%; p is less than or equal to 0.018 percent; s is less than or equal to 0.006%; cr0.10-0.14%; v0.01-0.03%, and Fe and unavoidable impurities in balance. The average drop hammer qualification rate of the welded joint of the steel rail reaches more than 96 percent, and the area of the broken ash spot is 3.8mm 2 In the following, the welding performance is obviously improved.
The following describes the invention in detail by way of specific examples, which are intended to aid in understanding the invention and are not intended to limit the invention.
Example 1
The method sequentially comprises the following steps: molten iron pretreatment, converter smelting, LF refining, VD vacuum degassing and continuous casting to produce a continuous casting blank of a high-speed steel rail, wherein the chemical components and the content of the continuous casting blank are shown in the following table 1; and then the high-speed steel rail is produced by the following procedures: heating a continuous casting blank, descaling by high-pressure water, rolling by a universal rolling mill, cooling by a cooling bed, pre-bending, straightening, flaw detection, processing, checking and warehousing; wherein:
in the molten iron pretreatment process, the sulfur content in molten iron is controlled to be 0.010 percent, and the phosphorus content is controlled to be 0.10 percent;
in the converter smelting process, the content of tapping C is controlled to be more than or equal to 0.08%, the tapping temperature is controlled to be more than or equal to 1560 ℃, lime, calcium silicate barium and fluorite are added after tapping, deoxidation and slag modification are carried out, the argon blowing effect is ensured in the tapping process, and the slag is not blocked when molten steel is refined in place;
in the LF refining process, desulfurization is carried out according to the components and the temperature of the molten steel of the converter, and the components are finely adjusted and the temperature is increased, so that the refining in-place temperature is required: 1560-1600 ℃;
in the VD vacuum degassing process, the deep vacuum degassing time is not less than 15min, soft blowing is not less than 18min after vacuum degassing, the flow rate of soft blowing Cheng Yaqi is stable, and the molten steel is not exposed due to creeping;
in the continuous casting process, protection casting is adopted, low-aluminum casting powder is adopted, weak cold water distribution is adopted in the second cooling section, the whole-process constant pulling speed operation is adopted, the pulling speed is 4.4-5.0m/min, the electromagnetic stirring and the light pressing of the casting machine are started, the electromagnetic stirring light pressing parameters of the second cooling water and the pressing quantity of each withdrawal straightening machine are set, and the quality of a continuous casting blank is ensured; and rolling the continuous casting blank by a universal rolling mill in a rail girder factory to obtain the steel rail.
Examples 2 to 3 were conducted in accordance with the procedure of example 1 except that the chemical composition content of the continuous casting slab was different from that of example 1, and are specifically shown in the following table 1.
The steel rails (hereinafter referred to as U71 MnCr) obtained in examples 1 to 3 were subjected to a fixed flash welding test using a GAAS80 welder, the weight of the drop weight test was 1000.31kg, the drop weight height was 5.2 m, the head of the test piece with a 1m gauge was upward, the weld was centered, the test temperature was 20 ℃, and the drop weight test results were as shown in table 2 below, wherein the U71Mn steel rail was a U71Mn steel rail conventionally used in the prior art. The fracture gray spot areas of the high speed rails obtained in examples 1-3 were also examined and the results are shown in table 3 below.
Table 1: chemical composition and content (%)
Table 2: drop hammer test of the weld joint of the existing U71Mn rail and U71MnCr of examples 1-3
Table 3: fracture gray plaque area statistics of U71MnCr of examples 1-3
| Examples | Fracture gray spot area (average)/mm 2 |
| Example 1 | 3.3 |
| Example 2 | 3.8 |
| Example 3 | 3.6 |
As can be seen from the above Table 2, the drop weight qualification rate of the high-speed steel rail U71MnCr produced in the examples 1-3 is obviously improved by more than 96% compared with that of the traditional U71Mn steel rail, and as can be seen from the above Table 3, the breakage of the high-speed steel rail U71MnCr produced in the examples 1-3The average value of the area of the grey spots on the mouth is 3.8mm 2 In addition, the fracture gray spot area of the existing U71Mn steel rail is obviously lower than that of the existing U71Mn steel rail, so that the high-speed steel rail U71MnCr provided by the invention has very excellent welding performance and good popularization and application values.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalents may be substituted for part of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A U71MnCr steel rail with good welding quality comprises the following chemical components in percentage by mass: c0.69-0.73%; si 0.35-0.50%; mn0.70-0.74%; p is less than or equal to 0.018 percent; s is less than or equal to 0.006%; cr0.10-0.14%; v0.01-0.03%, and Fe and unavoidable impurities in balance;
the average drop hammer qualification rate of the welding joint of the U71MnCr steel rail reaches more than 96 percent, and the fracture gray spot area is 3.8mm 2 The following are set forth;
the smelting method of the U71MnCr steel rail comprises the following steps: molten iron pretreatment, converter smelting, LF refining, VD vacuum degassing and continuous casting; wherein:
in the LF refining process, desulfurization is carried out according to the components and the temperature of the molten steel of the converter, and the components are finely adjusted and the temperature is increased, so that the refining in-situ temperature is 1560-1600 ℃;
in the continuous casting process, protection casting is adopted, low-aluminum casting powder is adopted, weak cold water distribution is adopted in the second cooling section, the whole-process constant pulling speed operation is adopted, the pulling speed is 4.4-5.0m/min, the electric stirring and the light pressing of the casting machine are started, and the quality of the continuous casting blank is ensured;
wherein the chemical components of the continuous casting blank comprise the following components in percentage by mass: c0.69-0.73%; si 0.35-0.50%; mn0.70-0.74%; p is less than or equal to 0.018 percent; s is less than or equal to 0.006%; cr0.10-0.14%; v0.01-0.03%, and Fe and unavoidable impurities in balance.
2. The U71MnCr rail as claimed in claim 1, wherein the molten iron pretreatment process controls sulfur content in the molten iron to be 0.010% or less and phosphorus content to be 0.10% or less.
3. The U71MnCr steel rail of claim 1, wherein in the converter smelting process, the content of tapping C is controlled to be more than or equal to 0.08%, the tapping temperature is controlled to be more than or equal to 1560 ℃, lime, calcium silicate barium and fluorite are added after tapping, deoxidization and slag modification are carried out, the argon blowing effect is ensured in the tapping process, and the slag is not agglomerated when molten steel is refined in place.
4. The U71MnCr rail of claim 1, wherein in said VD vacuum degassing process, the deep vacuum degassing time is not less than 15min, the soft blowing after vacuum degassing is not less than 18min, the soft blowing is Cheng Yaqi flow rate is stable, and the molten steel is not exposed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310910554.4A CN117051329A (en) | 2023-07-24 | 2023-07-24 | U71MnCr steel rail with good welding quality and smelting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310910554.4A CN117051329A (en) | 2023-07-24 | 2023-07-24 | U71MnCr steel rail with good welding quality and smelting method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110607488A (en) * | 2019-09-02 | 2019-12-24 | 鞍钢股份有限公司 | Online heat treatment steel rail for high-speed railway and manufacturing method thereof |
| CN113388778A (en) * | 2021-05-14 | 2021-09-14 | 包头钢铁（集团）有限责任公司 | Production method of high-low temperature fracture toughness steel rail |
| CN115369305A (en) * | 2022-08-23 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Smelting method of easily-welded high-speed steel rail |
| CN115555399A (en) * | 2022-10-21 | 2023-01-03 | 包头钢铁（集团）有限责任公司 | Rolling method of easy-to-weld U71Mn high-speed steel rail |
-
2023
- 2023-07-24 CN CN202310910554.4A patent/CN117051329A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110607488A (en) * | 2019-09-02 | 2019-12-24 | 鞍钢股份有限公司 | Online heat treatment steel rail for high-speed railway and manufacturing method thereof |
| CN113388778A (en) * | 2021-05-14 | 2021-09-14 | 包头钢铁（集团）有限责任公司 | Production method of high-low temperature fracture toughness steel rail |
| CN115369305A (en) * | 2022-08-23 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Smelting method of easily-welded high-speed steel rail |
| CN115555399A (en) * | 2022-10-21 | 2023-01-03 | 包头钢铁（集团）有限责任公司 | Rolling method of easy-to-weld U71Mn high-speed steel rail |
Non-Patent Citations (3)
| Title |
|---|
| 《钢轨基础知识及实用技术》编委会: "《钢轨基础知识及实用技术》", 30 June 2018, 中国铁道出版社, pages: 23 * |
| 张信传 等: "《中国钢铁工业技术创新战略》", 31 December 1998, 冶金工业出版社, pages: 102 - 103 * |
| 朱立光 王杏娟: "《连铸保护渣理论与实践》", 31 October 2015, 冶金工业出版社, pages: 177 * |
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