CN117026076A - Smelting method of microalloyed high-speed steel rail - Google Patents
Smelting method of microalloyed high-speed steel rail Download PDFInfo
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- CN117026076A CN117026076A CN202310933293.8A CN202310933293A CN117026076A CN 117026076 A CN117026076 A CN 117026076A CN 202310933293 A CN202310933293 A CN 202310933293A CN 117026076 A CN117026076 A CN 117026076A
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- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000003723 Smelting Methods 0.000 title claims abstract description 28
- 229910000997 High-speed steel Inorganic materials 0.000 title claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- 238000009749 continuous casting Methods 0.000 claims description 25
- 238000010079 rubber tapping Methods 0.000 claims description 20
- 238000009849 vacuum degassing Methods 0.000 claims description 19
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 15
- 238000007670 refining Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 230000004048 modification Effects 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 239000010436 fluorite Substances 0.000 claims description 5
- 238000011065 in-situ storage Methods 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 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
- 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
- 238000003825 pressing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/085—Rail sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
- C21C7/064—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
- C22C38/04—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
- C22C38/20—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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a smelting method of a microalloyed high-speed steel rail, which optimizes the chemical composition percentage content of the high-speed steel rail to be C0.68-0.70% by adding microalloyed elements into the steel rail; si 0.40-0.52%; mn 0.80-0.85%; p is less than or equal to 0.025%; s is less than or equal to 0.006%; cr 0.06-0.08%; 0.02 to 0.03 percent of B; cu 0.01-0.02%, fe and unavoidable impurities in balance, and the microalloyed high-speed steel rail with good welding performance can be obtained by controlling smelting process parameters.
Description
Technical Field
The invention belongs to the technical field of metallurgical materials, and particularly relates to a smelting method of a microalloyed high-speed steel rail.
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 performance of the U71Mn rail is found to be poor.
Disclosure of Invention
In order to solve the problems, the invention provides a smelting method of a micro-alloyed high-speed steel rail, wherein the micro-alloyed high-speed steel rail comprises the following chemical components in percentage by mass: c0.68-0.70%; si 0.40-0.52%; mn 0.80-0.85%; p is less than or equal to 0.025%; s is less than or equal to 0.006%; cr 0.06-0.08%; 0.02 to 0.03 percent of B; 0.01 to 0.02 percent of Cu, and the balance of Fe and unavoidable impurities;
the smelting method comprises the following steps: molten iron pretreatment, converter smelting, LF refining, VD vacuum degassing and continuous casting;
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 required to be more than or equal to 1600 ℃;
in the VD vacuum degassing process, the deep vacuum degassing time is not less than 20min, soft blowing is not less than 28min 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 6.0-7.0m/min, the electric stirring and the light pressing of the casting machine are started, and the quality of the continuous casting blank is ensured.
In some embodiments, the chemical composition of the microalloyed high speed rail comprises, in mass percent: c0.68-0.70%; si 0.40-0.50%; mn 0.80-0.84%; p is less than or equal to 0.015 percent; s is less than or equal to 0.002%; cr 0.06-0.08%; 0.02 to 0.03 percent of B; cu 0.01-0.02%, and Fe and unavoidable impurities in balance.
The invention also provides a microalloyed high-speed steel rail, which is obtained by rolling the continuous casting billet obtained by the smelting method.
According to the smelting method of the microalloyed high-speed steel rail provided by the technical scheme, microalloyed elements (such as Cr, B and Cu) are added into the steel rail, and the welding performance of the steel rail can be improved by controlling smelting process parameters in a combined manner.
Detailed Description
The invention aims to provide a smelting method of a microalloyed high-speed rail, and provides the microalloyed high-speed rail.
The chemical components of the microalloyed high-speed steel rail provided by the invention comprise the following components in percentage by mass: c0.68-0.70%; si 0.40-0.52%; mn 0.80-0.85%; p is less than or equal to 0.025%; s is less than or equal to 0.006%; cr 0.06-0.08%; 0.02 to 0.03 percent of B; 0.01 to 0.02 percent of Cu, and the balance of Fe and unavoidable impurities;
the smelting method comprises the following steps: 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 required to be more than or equal to 1600 ℃;
in the VD vacuum degassing process, the deep vacuum degassing time is not less than 20min, soft blowing is not less than 28min 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 6.0-7.0m/min, the electric stirring and the light pressing of the casting machine are started, and the quality of the continuous casting blank is ensured.
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 a microalloyed high-speed steel rail can be provided, and the microalloyed high-speed steel rail comprises the following chemical components in percentage by mass: c0.68-0.70%; si 0.40-0.52%; mn 0.80-0.85%; p is less than or equal to 0.025%; s is less than or equal to 0.006%; cr 0.06-0.08%; 0.02 to 0.03 percent of B; cu 0.01-0.02%, and Fe and unavoidable impurities in balance. The microalloyed high-speed steel rail has good welding performance, and the welding drop hammer qualification rate can reach more than 95%.
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 the microalloyed high-speed steel rail, wherein the chemical components and the content of the continuous casting blank are shown in the following table 1; then the microalloyed high speed 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 0.08%, the tapping temperature is 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 molten steel of a converter, and the components are finely adjusted and the temperature is increased, so that the refining in-situ temperature is required to be 1600 ℃;
in the VD vacuum degassing process, the deep vacuum degassing time is 20min, soft blowing is carried out for 28min after vacuum degassing, the soft blowing is carried out for Cheng Yaqi, the flow is stable, and the peristaltic movement of molten steel is not exposed;
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 6.5m/min, the electromagnetic stirring and the light reduction of the casting machine are started, the electromagnetic stirring light reduction parameters of the second cooling water and the reduction of each withdrawal straightening machine are set, and the quality of continuous casting billets is ensured; and rolling the continuous casting blank by a universal rolling mill in a rail girder factory to obtain the microalloyed high-speed 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.
Comparative example 1 the procedure of example 1 was followed, except that the smelting process parameters were varied, and the method of smelting rails of comparative example 1 included the steps of: 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 0.08%, the tapping temperature is 1550 ℃, lime, calcium-silicon-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 molten steel of a converter, and the components are finely adjusted and the temperature is increased, so that the refining in-situ temperature is required to be 1580 ℃;
in the VD vacuum degassing process, the deep vacuum degassing time is 16min, soft blowing is carried out for 20min after vacuum degassing, the soft blowing is carried out for Cheng Yaqi, the flow is stable, and the peristaltic movement of molten steel is not exposed;
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 6.5m/min, the electromagnetic stirring and the light reduction of the casting machine are started, the electromagnetic stirring light reduction parameters of the second cooling water and the reduction of each withdrawal straightening machine are set, and the quality of continuous casting billets is ensured; and rolling the continuous casting blank by a universal rolling mill in a rail girder factory to obtain the microalloyed steel rail.
The microalloyed high speed rails obtained in examples 1-3 and comparative example 1 were subjected to drop weight performance test, the drop weight was 1000.31kg, the drop weight height was 5.2 meters, the head of the test piece 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 150 rails for the drop weight performance test for the rails of examples 1-3 included 50 rails obtained in example 1, 50 rails obtained in example 2, and 50 rails obtained in example 3).
Table 1: chemical composition and content (%)
Table 2: drop hammer performance test results of rails produced in examples and comparative examples
| Number of welded rails/branch of experiment | Number of first drop hammer breaks/branch | Drop weight percent of pass | |
| Rail of comparative example 1 | 75 | 5 pieces of | 93.3％ |
| Rails of examples 1-3 | 150 | 7 pieces of | 95.3％ |
As can be seen from the table 2, compared with the comparative example 1, the drop hammer qualification rate of the microalloyed high speed rail produced in the examples 1-3 is obviously higher and can reach more than 95%, which proves that the method of the invention can effectively improve the welding performance of the high speed rail and has good popularization value.
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 (3)
1. A smelting method of a micro-alloyed high-speed steel rail comprises the following chemical components in percentage by mass: c0.68-0.70%; si 0.40-0.52%; mn 0.80-0.85%; p is less than or equal to 0.025%; s is less than or equal to 0.006%; cr 0.06-0.08%; 0.02 to 0.03 percent of B; 0.01 to 0.02 percent of Cu, and the balance of Fe and unavoidable impurities;
the smelting method comprises the following steps: molten iron pretreatment, converter smelting, LF refining, VD vacuum degassing and continuous casting;
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 required to be more than or equal to 1600 ℃;
in the VD vacuum degassing process, the deep vacuum degassing time is not less than 20min, soft blowing is not less than 28min 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 6.0-7.0m/min, the electric stirring and the light pressing of the casting machine are started, and the quality of the continuous casting blank is ensured.
2. The smelting method according to claim 1, wherein the chemical components of the micro-alloyed high-speed rail comprise, in mass percent: c0.68-0.70%; si 0.40-0.50%; mn 0.80-0.84%; p is less than or equal to 0.015 percent; s is less than or equal to 0.002%; cr 0.06-0.08%; 0.02 to 0.03 percent of B; cu 0.01-0.02%, and Fe and unavoidable impurities in balance.
3. A microalloyed high speed rail obtained by rolling a continuous casting billet obtained by the smelting method according to claim 1 or 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310933293.8A CN117026076A (en) | 2023-07-27 | 2023-07-27 | Smelting method of microalloyed high-speed steel rail |
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| CN202310933293.8A CN117026076A (en) | 2023-07-27 | 2023-07-27 | Smelting method of microalloyed high-speed steel rail |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104185690A (en) * | 2012-04-23 | 2014-12-03 | 新日铁住金株式会社 | 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 |
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- 2023-07-27 CN CN202310933293.8A patent/CN117026076A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104185690A (en) * | 2012-04-23 | 2014-12-03 | 新日铁住金株式会社 | 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 |
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